Soil saturated hydraulic conductivity and its influencing factors on the slope with long-term plantation of Caragana korshinskii in the loess hilly region
TIAN Xin, ZHAO Yonggang, LIU Qixia, YANG Lu, LIU Xiaofang
School of Life Science, Shanxi Normal University, 030031, Taiyuan, China
Abstract：[Background] The saturated hydraulic conductivity (Ks) can characterize the strength of soil water conductivity, which is an important indicator of soil water conductivity and is closely related to eco-hydrology and soil erosion. Artificial shrub planting on slopes is an essential measure for controlling soil and water loss and restoring fragile ecosystems in the loess hilly areas, but the effect on Ks remains unclear. Soil transfer functions are constructed by integrating easily measurable or obtainable soil indices to estimate Ks accurately.[Methods] This study focused on the sloping land planted with Caragana korshinskii for 15, 25, and 35 years and a control wasteland with wild grass in the loess hilly areas of Ningxia. Three random sample plots were set up along the horizontal slope surface, each with three replicates. The characteristics of Ks variation were investigated and its main soil influencing factors at five slope positions, including top-slope, shoulder-slope, up-slope, mid-slope and low-slope were studied, from 0 to 100 cm (0-40 cm with 10 cm intervals, 40-100 cm with 20 cm intervals). Six common soil transfer functions, Cosby1, Cosby2, Weynants, Saxton, Wang, and W sten, were used to fit Ks.[Results] The Ks range was 6.81-60.77 mm/h, and C. korshinskii planting duration and slope position had significant effects (P<0.05). With the increase of C. korshinskii planting years, Ks first increased (15 years of planting) and then decreased in the 0-40 cm soil layer, while Ks continuously increased in the 40-100 cm soil layer. The highest Ks was at the slope bottom, followed by the slope top and middle, and the lowest at the slope shoulder and upper slope. The simulated results of the six selected soil transfer function models indicated that, except for the W sten model considering soil layer depth, the predicted values of other models were all lower than the measured values. Correlation analysis showed that Ks was closely related to other physical and chemical properties except capillary porosity. The influence of soil properties on Ks was mainly closely related to the formation and stability of soil structure. Path analysis identified organic carbon, saturated water content, and bulk density as the key soil factors affecting Ks on the slope, and the constructed soil transfer function model based on these factors can predict Ks changes more accurately.[Conclusions] In summary, long-term C. korshinskii planting on slopes may generally increase Ks, but this change is jointly affected by the sea buckthorn planting duration and slope position. The Ks soil transfer function constructed in this study may provide a reference for simulating and predicting Ks on slopes in the loess hilly areas.
田昕, 赵勇钢, 刘啟霞, 杨璐, 刘小芳. 黄土丘陵区长期种植柠条坡地土壤饱和导水率及其影响因素[J]. 中国水土保持科学, 2023, 21(4): 20-27.
TIAN Xin, ZHAO Yonggang, LIU Qixia, YANG Lu, LIU Xiaofang. Soil saturated hydraulic conductivity and its influencing factors on the slope with long-term plantation of Caragana korshinskii in the loess hilly region. SSWC, 2023, 21(4): 20-27.
ZHU Pingzong, ZHANG Guanghui, WANG Hongxiao, et al. Soil infiltration properties affected by typical plant communities on steep gully slopes on the Loess Plateau of China[J]. Journal of Hydrology, 2020, 590:1.
[2]
LIU Shaozhen, WANG Yunqiang, AN Zhisheng, et al. Watershed spatial heterogeneity of soil saturated hydraulic conductivity as affected by landscape unit in the critical zone[J]. Catena, 2021, 203:1.
[3]
GU Chaojun, MU Xingmin, GAO Peng, et al. Influence of vegetation restoration on soil physical properties in the Loess Plateau, China[J]. Nature review Cancer, 2019, 19(2):716.
[4]
FU Tonggang, GAO Hui, LIANG Hongzhu, et al. Controlling factors of soil saturated hydraulic conductivity in Taihang Mountain Region, northern China[J]. Geoderma Regional, 2021, 26:e00417.
[5]
LADO M, PAZ A, BENHUR M. Organic matter and aggregate size interactions in infiltration, seal formation, and soil loss[J]. Soil Science Society of America Journal, 2004, 68(3):488.
[6]
赵春雷, 邵明安, 贾小旭. 黄土高原北部坡面尺度土壤饱和导水率分布与模拟[J]. 水科学进展, 2014, 25(6):806. ZHAO Chunlei, SHAO Ming'an, JIA Xiaoxu, et al. Distribution and simulation of saturated soil hydraulic conductivity at a slope of northern Loess Plateau[J]. Advances in Water Science, 2014, 25(6):806.
[7]
MU Xingmin, ZHANG Xiuqin, SHAO Hongbo, et al. Dynamic changes of sediment discharge and the influencing factors in the Yellow River, China, for the recent 90 years[J]. CLEAN-Soil, Air, Water, 2012, 40(3):303.
[8]
SCHWÄRZEL K, ZHANG Lulu, MONTANARELLA L, et al. How afforestation affects the water cycle in drylands:A process-based comparative analysis[J]. Global Change Biology, 2020, 26(2):944.
[9]
李裕元, 邵明安, 陈洪松, 等. 水蚀风蚀交错带植被恢复对土壤物理性质的影响[J]. 生态学报, 2010, 30(16):4306. LI Yuyuan, SHAO Ming'an, CHEN Hongsong, et al. Impacts of vegetation recovery on soil physical properties in the cross area of wind-water erosion[J]. Acta Ecologica Sinica, 2010, 30(16):4306.
[10]
KLUTE A, DIRKSEN C. Hydraulic conductivity of saturated soils:Field methods[M]//A. Amoozegar, A. W. Warrick.[SSSA Book Series]. Methods of Soil Analysis:Part 1-Physical and Mineralogical Methods. Book Series:SSSA Book Series, 1986.
[11]
吕贻忠, 李保国. 土壤学实验[M]. 北京:中国农业出版社, 2010:119. LÜ Yizhong, LI Baoguo. Experiments in soil science[M]. Beijing:China Agriculture Press, 2010:119.
[12]
ZHANG Yonggen, SCHAAP M G. Estimation of saturated hydraulic conductivity with pedotransfer functions:A review[J]. Journal of Hydrology, 2019, 575:1011.
[13]
COSBY B J, HORNBERGER G M, CLAPP R B, et al. A statistical exploration of the relationships of soil moisture characteristics to the physical properties of soils[J]. Water Resources Research, 1984, 20(6):682.
[14]
WÖSTEN J H M, LILLY A, NEMES A, et al. Development and use of a database of hydraulic properties of European soils[J]. Geoderma, 1999, 90(3/4):169.
[15]
WEYNANTS M, VEREECKEN H, JAVAUX M. Revisiting vereecken pedotransfer functions:Introducing a closed-form hydraulic model[J]. Vadose Zone Journal, 2009, 8(1):86.
[16]
SAXTON K E, RAWLS W J. Soil water characteristic estimates by texture and organic matter for hydrologic solutions[J]. Soil Science Society of America Journal, 2006, 70(5):1569.
[17]
WANG Yunqiang, SHAO Ming'an, LIU Zhipeng. Pedotransfer functions for predicting soil hydraulic properties of the Chinese loess plateau[J]. Soil Science, 2012, 177(7):424.
[18]
LU Jianrong, ZHANG Qi, WERNER A D, et al. Root-induced changes of soil hydraulic properties:A review[J]. Journal of Hydrology, 2020, 589:1.
[19]
纳磊, 张建军, 朱金兆, 等. 晋西黄土区不同土地利用类型坡面土壤饱和导水率研究[J]. 水土保持研究, 2008,15(3):69. NA Lei, ZHANG Jianjun, ZHU Jinzhao, et al. Spatial heterogeneity of soil saturated hydraulic conductivity from different land use types on loess slope in west of Shanxi Province[J]. Research of Soil and Water Conservation, 2008,15(3):69.
[20]
GAO Peng, WANG Xiangping, YANG Jingsong, et al. Evaluation of pedotransfer functions for estimating saturated hydraulic conductivity in coastal salt-affected mud farmland[J]. Journal of Soil Sediments, 2015, 15(4):902.
2023, Vol. 21 
