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| Eco-hydrological characteristics of soil on the forestland converted from farmland in Bashang plateau |
| Wang Fu1,Zhen Baoyan2,Dong Zhi1,Li Hongli1,Jia Zhijun2 |
| 1.College of Forestry,Key Laboratory of Agricultural Ecology and Environment,Shandong Agricultural University,Shandong Provincial Key Laboratory of Soil and Ecological Restoration,271018, Tai'an,Shandong;2.Hebei Extension and Experiment Center for Water Technology,050061,Shijiazhuang: China |
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Abstract The purpose of paper is to investigate the eco-hydrological effects and water conservation function of soil layers of different vegetation types on the forestlands converted from farmlands in the Bashang plateau.By the field sampling and laboratory test,the soil particle size distributions,soil water physical properties,and soil infiltration characteristics of Hippophae Rhamnoides forest,Caragana Korshinskii forest,and Ulmus pumila forest converted from farmlands in the Zhangbei County,a typical region of the Bashang plateau are studied.The results indicate that there are significant differences in soil bulk densities,soil porosities,and water holding capacities of the same soil layer under different vegetation types.However,there are not significant differences in those of different soil layers under the same vegetation type.Compared with enclosed grassland,the forestlands converted from farmlands can improve the structure of soil,and the eco-hydrological effects of which are better.1) The soil particle size distributions of 4 vegetation types mainly range from 1 to 0.05 mm,accounting for 64.08%-71.13%.2) The soil bulk densities of forest land is less than that of grassland,and the soil bulk densities of Ulmus pumila forest,Hippophae Rhamnoides forest,and Caragana Korshinskii forest are respectively reduced by 25.26%,24.98%,16.49% compared with enclosed grassland.3) The soil porosities,maximal water storage,and available water storage of Hippophae Rhamnoides forest is the highest,followed by these of Ulmus pumila forest,Caragana Korshinskii forest,and grassland.4) There is a better power function relationship between infiltration rate and infiltration time,that is f=at-b,and the soil steady infiltration rates of Caragana Korshinskii forest,Hippophae Rhamnoides forest,and Ulmus pumila forest are 4.96 times,3.18 times,and 2.88 times respectively as high as that of grassland.The results can provide theoretical basis for ecological benefits evaluation of forestlands converted from farmlands in the Bashang plateau.
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Received: 09 September 2009
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