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2007 Vol.5 No.1
Published 2007-02-28
Articles
1
ZHANG Guang-Can-；Zhou-Ze-Fu-；Liu-Xia-；Zhang-Chu-Yong-；Chen-Jian-；Han-Wei-；Li-Yan-Xiao
Density structure and growth dynamics of Larix Principis-rupprechtii stand for water resource conservation in Wutai Mountain region in Shanxi Province
To search after the adaptability on site and suitability on density of Larix Principis-rupprechtii Mayr.stand for water resource conservation,the growth process and diameter distribution characteristic of Larix Principis-rupprechtii Plantation in 10 years old were studied using stem analysis method of sample tree,which had two density structures(one was 2 600 per hm2,the other was 3 500 per hm2) in water conservation forest region of Wutai Mountain in Shanxi Province.The results showed that: 1) The tree height growth of two kind of forests were the same basically,and it was almost not affected by density.But the growth process of diameter and timber volume had great distinction.The growth status and its density structure of low density forests were superior to the high density forests.2) The
S
k
ewness(
S
k
) of diameter distribution had great distinction.The
S
k
(was 0.01) of low density forests approached to normal distribution,the density structure was reasonable,while the
S
k
(was 0.45) of high density forest was partial to normal distribution,the density structure was on the high side.The kurtosis(
K
) of two forests(one was-0.64,the other was-0.74) had little distinction and the density factor had little function to forest polarization.3) The growth of diameter at breast height,timber volume and trunk stock of low density forests increased year after year without effect of density.But the growth of high density forests had declined from since 6 years old,which was restricted by high density.4) The reasonable density of Larix Principis-rupprechtii Plantation about 10 years old was 2 600 per hm2,if the utilization of double cutting was not considered,it is also the reasonable planting density.
2007 Vol. 5 (1): 1-1 [
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1671
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2686KB] (
1340
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7
ZHANG Zhen-Guo-；Fan-Bian-E-；Bai-Wen-Juan-；Jiao-Ju-Yang
Soil anti-erodibility of plant communities on the removal lands in hilly-gully region of the Loess Plateau
The study result on soil anti-erodibility in Wuqi County,Shaanxi Province,a national experiment site for conversion from cropland,into forest land and grassland showed that all the 12 anti-erodibility indexes can be divided into 4 categories,i.e.inorganic clay,aggregate,inorganic colloid and water-stable aggregate,capable of reflecting 88.671% of the information of the eigenvalues,by means of PCA.All the plant communities in Wuqi County can be clustered into three kinds based on the four categories with the Hierachical Cluster Method.The first kind with good anti-erodibility mainly includes forest land and grassland from cropland with a long removal time,and the second kind with medium anti-erodibility is composed of Artemisia,where as the third with poor anti-erodibility is made up of newly forest land and grassland removed from cropland and the cropland.The anti-erodibility of artificial forests is getting stronger and stronger as the forest ages,approaching that of natural forests.
2007 Vol. 5 (1): 7-13 [
Abstract
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1436
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2778KB] (
1317
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14
WANG Yuan-Chang-；Tun-Yong-Gong-；Kou-Quan-；Min-De-An-；Chang-Yu-Zhong-；Zhang-Rong-Jun
Definition of arsenic rock zone borderline and its classification
Taking the TM remote sensing data as the main information source,route survey and typical small watershed survey were used as the methods.Through massive field investigation,the image interpretion signs of different types of soft rock was established.With the supporting of geographic information system,by the meathod of computer assistanted artificial interpretion,the bordline of the soft rock was defined which mainly takes Shanxi,Shaanxi and Inner Mongolia contiguous area as its distribution center,and divided it into such three type areas as the exposed area,the loess covered area and the sand covered area.The distributive scope and the area size of each type have been determined.The result showed that the soft rock with the total area of 16 700 km
2
,of which exposed area 4 543.89 km
2
,sand covered area 3 709.18 km
2
,loess covered area 8 432.41 km
2
,separately accounts for the total area 27.2%,22.2% and 50.6%,areas of soft rock were defined.
2007 Vol. 5 (1): 14-18 [
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1470
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1506
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19
WEN Zhong-Meng-；He-Xiao-Hui-；Jiao-Feng-；TimR.McVicar；LingTaoLi；TomG.VanNiel
Mapping the vegetation suitability in the Coarse Sandy Hilly Area of the Loess Plateau,China
Vegetation suitability mapping is valuable for the selection of species for implementing the Re-Vegetation Program in the Coarse Sandy Hilly Catchments of the Loess Plateau,China.A Boolean model was introduced,which used thin plate smoothing spline interpolation method to model the distribution of precipitation and temperature,and analyzed the suitability of 38 species using GIS techniques as well as considering the requirement of these species for environmental conditions.Then we overlaid the single suitability map of 38 species,and got the frequency map of species for a specified site.Here high frequency means the higher suitability of a site for re-vegetation.The result showed that with combination of topographic analysis based on DEM and GIS functions the spatial changes of vegetation suitability can be modeled.These spatial changes on the screen using Visual Basic language and GIS functions was also demonstrated,thus helping decision makers to have an intuitionistic view of species and site suitability changes over large area.Although some more powerful models such as GLM and GAM were not employed due to the data limit,yet the method here still can provide some insightful implication for similar studies in this area.
2007 Vol. 5 (1): 19-26 [
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1550
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27
LI Yang-Bing-；Zhou-Guo-Fu-；Long-Jian
The land use genesis classification of karst rockification
Based on land rockification and land use datum in 2004,the land use types distribution law in different grade rockification and occurrence ratio of rockification in different land use types in Huangping county were researched quantitatively.Results indicated that there is a relativity among different grade rockification and land use types,the shrub-land,sparse coverage grass slopes,unused land,slope cropland and rocky dry-land have a higher occurrence ratio of karst rockification.Slight rockification was dominated by sparse and moderate coverage grass slopes,moderate rockification was dominated by unused land,moderate coverage grass slopes and rocky dry-land,intense rockification was dominates by rocky dry-land and unused land.But these spatial correlations among land use patterns and different grade rockification varied with districts.Furthermore,the slight,moderate and intense rockification are classified as land use types,so the restoration and reconstruction of slight,moderate and intense rockification land should be emphasised corresponding land use patterns in Huangping County and its Ⅰ～Ⅴ subarea.
2007 Vol. 5 (1): 27-30 [
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1349
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2111KB] (
1272
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31
ZHANG Ke-Bin-；Li-Rui-；Wang-Bai-Tian
Effects of wind prevention and sand resistance of high-cold oasis protection system in Qinghai-Tibet Plateau
Xiangride Oasis as a typical high-cold artificial oasis was selected.By investigating the present status of protection forest,observing strong wind in deferent season in oasis exterior,border and interior,sand-resistance.The results showed that the effects of wind prevention of the oasis protection forest system were marked.In oasis border and interior the wind speed are reduced 1/3 and 1/2 than in oasis exterior and the wind prevention degree was 60.44%.The sand resistance of shrubbery in oasis exterior was also significant.The total width and the amount of sand resistance were linear positively significant(<i>P</i><0.01, <i>r</i>=0.782 3**);the shrub height and the amount of sand resistance were linear significant(<i>P</i><0.01,<i>r</i>=0.608 8*).
2007 Vol. 5 (1): 31-34 [
Abstract
] (
1508
) [
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2464KB] (
1404
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35
DONG Zhi-；Li-Gong-Li-；Hong-Ji-；Ding-Guo-Dong-；Sun-Bao-Beng
Wind tunnel test on effect of controlling windand deposited sand of geogrid sand-barrier
The model was designed with 1∶10 scale,and the testing wind velocity consisted of 7 m/s,15 m/s and 20 m/s.Effect of controlling wind and deposited sand of geogrid sand-barrier with different size and porosity was measured under wind tunnel test.The results are as follows: The trend of wind flow field is same to different size geogrid barriers,there shaped four speed-down regions and three speedup regions before,inside and after barriers.It was the preventing mechanism of barriers to decrease wind speed and deposit sands before and after barriers.And the wind speedup region of middle barriers provided occasion for no or less deposited sand in barriers middle.The fence function increase because of barriers be joined,and the shifting sand can be effectively controlled inner the barriers system.To the same size barrier,the thickness of deposited sand increased with wind velocity,and decreased with the distance to sand source.The thickness of deposited sand decreased with size and porosity to different size barriers.The thickness of deposited sand have notable difference to different size barriers with different wind speed.According to the deposited sand depth and the preventing intention,the best ability of deposition of sand-barrier was 10 cm×10 cm scale,10 cm×20 cm was better,and 20 cm×20 cm was worst.Furthermore,It need to be considered various factors such as cost,fence objective and sand source so on when designed and setting geogrid barriers.
2007 Vol. 5 (1): 35-39 [
Abstract
] (
1969
) [
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2792KB] (
1461
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40
ZHANG Hong-Jiang-；Cheng-Jin-Hua-；He-Fan
Effects of land-cover types on sediment yield in the Three-Gorge Region of Yangtze River
The effects of land-cover change on sediment yield in Simian Mountain were studied to probe into temporal and spatial variation rule of sediment yield and the relation to environment change in the Three-Gorge Region of Yangtze River.Thirty soil erosion plots were located.The influence of different vegetation types on sediment yield was studied by analyzing process of rainfall,and soil erosion on different degrees slopes under different land-use condition.Results showed that sediment yielded from slope chiefly come from arable land and bare land located at slope,and the quantity of sediment yielded from arable land located at the slope above 25°accounted for about 50% of the total sediment yielded from slope.Land cover types had significant effects on sediment yield of slope.At the same time,the amount of sediment could be decreased 71.05%-95.58% if the forest cover rate reached 70%-80%.
2007 Vol. 5 (1): 40-43 [
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] (
1398
) [
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1760KB] (
1356
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44
CUI Xiang-Hui-；Feng-Jiang-；Wang-Hua-Quan
Characteristics and simulation analysis of evapotranspiration of shrub sand dune at the oasis-desert transitional zones
Evapotranspiration is one of the very important factors in water circulation and heat balance.Utilizing long-term observation and experimentation data,characteristics and changes of evapotranspiration shrub sand dune at the oasis-desert transitional zones were analyzed using Bowen-ratio methods;the relationship between evapotranspiration and meteorologic factors were explored.And then, evapotranspiration process in the Soil-Plant-Atmosphere Continuum were simulated with numerical simulation model.In the diurnal process of evapotranspiration, the occuring time of maximum evapotranspiration of
Tamarix ramosissima
and
Nitraria tangutorum
sand dune is earlier than that on the shifting sand dune.The order of maximum evapotranspiration rate is:
Tamarix ramosissima
sand dune(0.24 mm/h)>
Nitraria tangutorum
sand dune(0.20 mm/h)>shifting sand dune(0.18 mm/h).From July to September,the evapotranspiration of
Nitraria tangutorum
and
Nitraria tangutorum
were 69.3% and 65.4% of total evapotranspiration during the growing seasons.Through greycorrelation analysis,the main meteorologic factors effect on evapotranspiration were discovered,including sunlight,air temperature,air moisture stress,wind speed and so on;their correlative coefficients are 0.717,0.643,0.649 and 0.705 respectively.The preliminary results indicated that SPAC model is suitable for simulating and predicting evapotranspiration processes on the surface covered with different plants in arid and semi-arid area.
2007 Vol. 5 (1): 44-48 [
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1537
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1135
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49
ZHANG Wei-Jiang-；He-Kang-Ning-；Shu-Yan-Yan-；Zhou-Yi-；Gong-Yu-Xia-；Tang-Dao-Feng
Relationship between transpiration of
Pinus tabulaeformis
and its influencing factors in a semi-arid region of the Loess Plateau
Relationship between transpiration of forest tree and its influencing factors is closely.Through controlling soil moisture artificially,using portable steady porometer(Li-1600) and speedy weight method(BP-3400) etc.,Transpiration rate Tr of
Pinus tabulaeformis
and environmental factors were measured under the condition of representative fine day in growing season of 2004.The results indicated that the diurnal course of transpiration rate(Tr) and stomatal resistance(Rst) of
Pinus tabulaeformis
display a double-peak curve and a "W" curve respectively under different soil moisture.Under the condition of representative fine day,the transpiration rate presents a cubic relation with soil water content,the SWC which causing Tr of
Pinus tabulaeformis
highest was 17.7%,19.8% and 17.5% in July,August and October respectively.Tr was affected not only by its physiology characteristic but also by the SWC and meteorologic factors.Tr had significant correlation with meteorologic factors if the soil moisture was sufficient,but it will decrease in serious water stress condition;In serious water stress condition,air temperature is the mainly factor to affect Tr in July and August,and photo synthetically active radiation is the mainly factor in October.When the soil water is sufficient,the mainly factor to affect transpiration rate was relative humidity,air temperature and leaf temperature in July,August and October respectively.The result of this paper provided the scientific basis of increasing survival rate and managing soil water in forestland.
2007 Vol. 5 (1): 49-54 [
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1700
) [
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3071KB] (
1331
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55
ZHANG Ying-；Tu-Xin-Xiao-；Xie-Bao-Yuan-；Chen-Li-Hua-；Lei-Hua-Dong-；Niu-Jian-Zhi
Ecological water demand of Gonghe Basin in Qinghai Province
Aimed at research meaning of the ecological water demand an example of Gonghe basin in Qinghai Province was presented and a further discussion to the calculation method of ecological water demand was made.The ecological water use has been carried on initial calculation,and the result showed the quantity of ecological water demands outside riverways is 5.3 million m
3
.The main part of which is used by artificial woodland,river system ecological water demand is of 352.3 million m
3
.Both of them are 357.6 million m
3
,accounts for 54.79% of the total water resources amount.With the result the ecological water demand has a specific gravity in available water resource.As an important part it should be brought into the research of the allocation of water resource so as to provide the basis for sustainable development of studied area where the ec-environment constantly worsens.At last the proposal was put forward that eco-environment construction of research area should primarily restore the degenerated pasture and change the pure arbor forest as to mixed forest with shrubs.
2007 Vol. 5 (1): 55-59 [
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1573
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2654KB] (
1198
)
60
YANG Feng-Wei-；Tu-Xin-Xiao-；Wang-Shu-Sen-；Zhang-Xiao-Meng-；Wu-Sai-Hong
Interspecific association and niche of forest vegetation in Rocky Mountain Area of North of China
Based on investigation of forest vegetation in Chaoguanxigou of rocky mountain area of North of China,interspecific association and niche of trees and shrubs in different communities were researched.The results showed that in the aspect of interspecific association,the interspecific positive associations of
Qurcus dentata
&
Tilia mongolica
,
Qurcus dentata
&
Rhododendron mucronulatum
,
Tilia mongolica
&
Populus davidiana
,
Tilia mongolica
&
Fraxinus rhynchophylla
,
Populus davidiana
&
Fraxinus rhynchophylla
,
Ulmus japonica
&
Syringa pekinensis
,
Ulmus japonica
&
Deutzia grandiflora
,
Ailanthus altissima
&
Prunus sibirica
,
Evodia daniellii
&
Koelreuteria paniculata
,
Evodia daniellii
&
Deutzia grandiflora
,
Rhamnus arguta
&
Grewia biloba
,
Rhamnus
&
Zizyphus jujuba
are obvious.Then species trees and shrubs into 4 groups of ecospecies were classified.The tree species of big niche breadth include
Tilia mongolica
,Qurcus dentate and
Ulmus japonica
and the shrub species of big niche breadth include Vitex negundo,Celtis bungeana and Zizyphus jujube.Moreover,the value of niche overlap of
Prunus sibirica
&
Syringa pekinensis
,Quercus dentate &
Fraxinus rhynchophylla
,and
Tilia mongolica
&
Ulmus japonica
in tree pairs and Vitex negundo &
Zizyphus jujuba
,
Spiraea trilobata
&
Rhododendron mucronulatum
,Vitex negundo & Celtis bungeana,
Myriopnois dioica
&
Rhododendron mucronulatum
in shrub pairs are high.
2007 Vol. 5 (1): 60-67 [
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1500
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1393
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68
WANG Zhu-Na-；Wang-Xiao-Guang-；Shi-Yu-Hu-；Bo-Lei-；Tu-Xue-Biao-；Tang-Zhang-Guo
Effects of soil and water conservation of the conversion of farmland to forest in Zigui County of the Three Gorges Reservoir Region
To show the effect to implementation to the environment improvement,and promote the sustainable development of the project of conversion of farmland,taking the project of Zigui as an example,the effects of soil and water conservation of the project was analysed,based on the investigation in the field and observation on located experimental plots.The result showed: 1) the effect is visible to control soil erosion,the surface runoff of the forest land was reduced from 75.25%-85.21%,and the soil erosion reduced 85.4%-95.6% comparing with the farmland every year;2) the project reduced soil erosion 54 900 t per year,and reduced the amount of sediment of river 12 700 t,and the loss amount of soil organic matter,N,P,K decreased 652 t,32 t,82 t and 871 t respectively.
2007 Vol. 5 (1): 68-72 [
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1724
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2506KB] (
1212
)
73
LI Jin-Yo-；Guo-Bao-Cheng
Application of grey relational analysis on the related effecting factors of rainfall in Taiwan
Rainfall caused many disasters in Taiwan recently.It was related to the geographic and climatic conditions.In this paper the grey relational analysis on the related factor of rainfall in Taiwan was applicated.It tried to find out factors of influencing the rainfall.Results showed,wind velocity factor is more related with rainfall.The factor that influences rainfall mainly in Taiwan's winter and autumn is the elevation,and mainly in spring and summer is wind velocity.
2007 Vol. 5 (1): 73-76 [
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1289
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1817KB] (
1326
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77
DIAO Yong-；Wang-Feng-Fei-；Fan-Wei-；Yan-Liang
Classification of typical degraded ecosystems at different stages of vegetation restoration:A case study in Xiaolangdi hilly areas,Henan Province,China
Based on the analysis of species diversity indices,altitude,slope,soil of the ecosystems in Xiaolangdi mountain region,the factors impacting degraded ecosystems were studied by the Principle Component Analysis(PCA).The restoration degree of vegetation in this region had been studied using cluster analysis in this paper.The models predicting the restoration stage was established using Discriminant analysis.The results show that: 1)the vegetation in this areas can be divided into 15 communities,according to plant life-form,trees,shrubs,herbs have 4,6 and 5 types respectively.2)soil,landform and soil erosion have big load.The diversity indexes,including
H
′
,
D
1
,
P
,
J
sw
,
D
2
have higher contributing rate to the first principal component.The stone amount in soil has only lager load on the second principal component.Erosion and soil depth,soil type,slope direction have relatively contributing rate on the second?third principal component.Altitude has lower load on the three principal components.3)The vegetation in the studying areas can be classified into 4 types,including initial restoration stage(IRS),progressive restoration stage(PRS),middle restoration stage(MRS),stable restoration stage(SRS).4)the percentage of IRS,PRS,MRS,SRS was 27%,40%,20% and 13%,respectively.5)the discriminant models established by discriminant analysis are credible and good for predicting vegetation restoration stages.
2007 Vol. 5 (1): 77-83 [
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1271
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3440KB] (
1478
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84
LIU Jing-An-；Gao-Feng-；Gao-Jun-Xia-；Liu-Gang
Eco-hydrological characteristics of soil of economic dry fruits forest in hilly area of central south of Shandong Province
An experiment was established on two economic forests of dry fruits sites in Matiyu small watershed.It aimed to find out the soil hydrology characteristics of economic forest of dry fruits in hilly area of central south of Shandong Province,and to provide scientific basis for economic forest benefits evaluation and itfs construction in earthy-rocky mountain area of north China.Results showed that the soil physical characteristics of economic dry fruits forest are obviously better than that of wasteland.The soil particle of economic dry fruits forest is much more than that of wasteland in 1～0.05 mm.Soil density of economic dry fruits forest is lower by 10.40% than that of wasteland,soil porosity and non-capillary porosity increases by 15.04% and 17.46%.The available water storage and maximal water storage of soil is higher by 4.07 mm and 18.36 mm in forest land than that in wasteland.The initial infiltration rate and final infiltration rate of forest land are 1.56 times and 1.52 times more than that of wasteland.Water absorption rate of litter is 168.52% in Castanea mollissima forest and 200.47% in Juglans regia forest.The litter layer of economic forest has high water-holding capacity,so the surface runoff can be decreased.Economic dry fruits forests can improve soil structure and form good soil hydrology characteristics in hilly area of central south of Shandong Province.
2007 Vol. 5 (1): 84-87 [
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1504
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2550KB] (
1348
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88
SHEN Li-Hua-；Zhang-Zhi-Jiang-；Liu-Chen-Feng-；Shu-Jin-Zhao-；Cha-Tong-Gang-；Fang-Xian-Dui-；Chen-Jun
Sapflow of
P.×euramericanacv
plantation trees in Sandy Soil
By the method of thermal dissipation,the characteristics of stem sap flow of
P.×euramericanacv
plantation was studied.Environmental factors including air temperature,air relative humidity,photosynthetically active radiation(PAR),soil temperature,wind speed and soil water content were also measured simultaneously with sap flow.The result showed that there were marked differences between sap flux density at south and at north on the trunk and sap flux density was found to be highly correlated between south and north.There existed marked differences in different months,sap flow rate was incresed from May to July.Difference can be seen at different trees,respectively,canopy size is the major influenced factor.There was a time lag between sap flux and PAR?vapor pressure deficit(VPD).The time lag for Par and VPD were ahead 30-60 min and after 120-150 min respectively.PAR was the dominant environmental variables affecting the diural variation of sap flow density in May,June and July,and in August were PAR and VPD.
2007 Vol. 5 (1): 88-92 [
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1461
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1KB] [
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2521KB] (
1262
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93
WANG Cheng-Hua-；Xu-Jun-；He-Sai-Meng-；Zhang-Xiao-Gang-；Zhou-Lin
Consolidation techniques by micro-root pile
There are generally three ways to stabilize sand-sliding slopes composed by granular clast: controlling and blocking the sand source,stabilizing the slope and protecting the slope toe.In this paper,the techniques of consolidation by perforated pipe micro-root pile are introduced.The sand-sliding slope consolidation mechanism and design theory of perforated pipe micro-root pile was studied based on field investigation and model tests.
2007 Vol. 5 (1): 93-96 [
Abstract
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1362
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1KB] [
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2010KB] (
1445
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97
ZHANG Dun-Bin
Application principles and evaluation for materials of ecological engineering in Taiwan
Ecological materials of natural and artificial material applied on the ecological engineering in internal currently,usually lack of evaluation for applicative conditions.Hence,this study carried on the whole research and identifications to draft the materials of ecological engineering.The evaluation models of applied materials for ecological engineering were proposed.The quantitative score were obtained by expert's person evaluation.Three models were proposed to quantify the effects of applied materials on the ecological environment.The statistical procedures were adopted to compare the performance of these materials for ecological engineering.The results indicated that the comparison of applied materials can be treated by quantitative analysis.For the further analysis,more evaluated data from expert's experience need to be collected then the bias of person subject can be reduced.In addition to reach the benefits in the respects of ecosystem,society,economy and function,also the comprehensive effects in ecological engineering can be obtained.
2007 Vol. 5 (1): 97-104 [
Abstract
] (
1960
) [
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1KB] [
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4252KB] (
1484
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105
WANG Chi-Guo-；Wang-Chun-Gong
Problems of regionalization and planning of soil and water conservation in China
Soil and water conservation planning is based on the data the of regionalization of soil and water conservation,and the data of soil erosion classification and regionalization.It is very important to understand the relation between the kinds of regionalization and planning correctly.Some conceptions,problems and interaction about it be discussed in this paper.The main viewpoints are that water resources administration should work out the blue prints of soil and water conservation regionalization,soil erosion regionalization and ecological natural restoration regionalization based on investigated results of soil erosion.
2007 Vol. 5 (1): 105-109 [
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1482
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2751KB] (
1567
)
110
LIU Chang-Shun-；Jiao-Jian-Hua-；Du-Li-Juan-；Xue-Hua-Xi
Impact and countermeasure of canceling compulsory labours and accumulated labours for soil and water conservation projects
Compulsory labours and accumulated labours are two main investment channels of soil and water conservation projects.These two types of labor had been gradually canceled since 2000.So soil and water conservation projects were faced with serious challenge.Investment gaps were about 15 billion Yuan every year.According to the principles of institutional reform in the rural area and public finance system,new mechanism of soil and water conservation investment should be built.All level of governments should bring investment of soil and water conservation projects into public finance system,and increase investment.Governments should try to build the system of special fund transfer payment of two types of labor and ecological compensation of soil and water conservation.Encourage public participate in soil and water conservation planning,give subsidy to farmers who invest money in soil and water conservation projects,mobilize positivity of farmers taking part in soil and water conservation projects.
2007 Vol. 5 (1): 110-113 [
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1350
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2710KB] (
1395
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114
NIU Lan-Lan-；Ding-Guo-Dong-；Diao-Fang-Ying
Soil erosion and countermeasures in road construction projects
As road construction bringing about the development and the prosperity of the economy,the environment problem,particularly soil erosion problem was aroused at the same time.In order to prevent soil erosion,guarantee the road safety,and promote the ecosystem conserration of road area,the feature and reasons of soil erosion and the negative influence that are aroused by the road construction projects thoroughly were studied.A brief introduction to the countermeasures of soil erosion was also made.
2007 Vol. 5 (1): 114-118 [
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1506
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1373
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