Abstract：[Background] The typical shrub species Caragana korshinskii Kom. is widely planted in the vegetation construction, and plays an important role in ecological restoration and soil erosion control in the arid and semi-arid area. [Methods] Four landscape transects including 15-, 25-, and 35-year-old C. korshinskii Kom. plantations with shrub belt and grass belt, and natural grassland (as control) were selected in the loess hilly region. Heterogeneity of soil moisture content at 0-100 cm depths and its main environmental impact factors were analyzed using redundant analysis. [Results] The soil moisture content on the slope of the study area ranged from 3.3% to 21.3%, showing a moderate variation. With increasing plantation years of C. korshinskii Kom., the values and variability of soil moisture content gradually decreased. The slope positions also had significant effects on soil moisture content, which showed an order of lower-slope > top-slope > mid-slope > upper-slope > shoulder-slope. With the increase of the plantation years of C. korshinskii Kom., the differences of soil moisture content between shrub belt and grass belt decreased, and showed positive values at all slope positions except for the top-slope position. Redundant analysis and variance partitioning analysis showed that plantation age and altitude were the main factors affecting soil moisture heterogeneity, followed by slope position, slope, coverage and belt. The explanation variances of soil moisture content by plantation age, altitude, and slope position were 1.9%, 6.1%, and 3.0%, respectively, and the integrated explanation variance by all environmental factors reached 74.4%. [Conclusions] Overall, the plantation of C. korshinskii Kom. in the loess hilly region reduced soil moisture content and its heterogeneity. Therefore, the synergy effects between the plantation ages of C. korshinskii Kom. and topographic factors should be considered for the distribution patterns of soil moisture content during regional vegetation restoration.
RODRIGUEZ-ITURBE I. Ecohydrology:A hydrologic perspective of climate-soil-vegetation dynamics[J]. Water Resources Research, 2000, 36(1):3.
[2]
YANG Lei, CHEN Liding, WEI Wei, et al.Comparison of deep soil moisture in two re-vegetation watersheds in semi-arid regions[J]. Journal of Hydrology, 2014, 513(1):314.
[3]
邱扬, 傅伯杰, 王军, 等. 土壤水分时空变异及其与环境因子的关系[J]. 生态学杂志, 2007, 26(1):100. QIU Yang, FU Bojie, WANG Jun, et al. Spatiotemporal variation of soil moisture and its relation to environmental factors[J]. Chinese Journal of Ecology, 2007, 26(1):100.
[4]
LI Haidong, SHEN Weishou, ZOU Changxin, et al.Spatio-temporal variability of soil moisture and its effect on vegetation in a desertified aeolian riparian ecotone on the Tibetan Plateau, China[J]. Journal of Hydrology, 2013, 479(5):215.
[5]
BROCCA L, TULL T, MELONE F, et al. Catchment scale soil moisture spatial-temporal variability[J]. Journal of Hydrology, 2012, 422(1):63.
[6]
吴钦孝, 杨文志. 黄土高原植被建设与持续发展[M]. 北京:科学出版社, 1998:2. WU Qinxiao, YANG Wenzhi. Vegetationconstruction and sustainable development on the Loess Plateau[M]. Beijing:Science Press, 1998:2.
[7]
PENNA D, BORGA M, NORBIATO D, et al. Hillslope scale soil moisture variability in a steep alpine terrain[J]. Journal of Hydrology, 2009, 364(3/4):311.
[8]
IVANOV V Y, FATICHI S, JENERETTE G D, et al. Hysteresis of soil moisture spatial heterogeneity and the "homogenizing" effect of vegetation[J]. Water Resources Research, 2010, 46(9):1.
[9]
李小雁. 水文土壤学面临的机遇与挑战[J]. 地球科学进展, 2012, 27(5):557. LI Xiaoyan. Opportunities and challenges for hydrology and soil science[J]. Advances in Earth Sciences, 2012, 27(5):557.
[10]
孙中峰, 张学培. 晋西黄土区坡面尺度土壤水分分布规律研究[J]. 水土保持通报, 2006, 26(2):27. SUN Zhongfeng, ZHANG Xuepei.Spacial distribution patterns of soil moisture on slopes in loess hilly areas[J]. Bulletin of Soil and Water Conservation, 2006, 26(2):27.
[11]
徐学选, 刘文兆, 高鹏, 等. 黄土丘陵区土壤水分空间分布差异性探讨[J]. 生态环境, 2003, 12(1):52. XU Xuexuan, LIU Wenzhao, GAO Peng, et al.The discussion on soil moisture distributional diversity in hilly Loess Plateau region[J]. Ecology and Environment, 2003, 12(1):52.
[12]
徐飞, 赖晓明, 朱青, 等. 太湖流域丘陵区两种土地利用类型土壤水分分布控制因素[J]. 生态学报, 2016, 36(3):592. XU Fei, LAI Xiaoming, ZHU Qing, et al.The controlling factors of soil moisture distribution under two typical land-use hillslopes in a hilly region of Taihu lake basin[J]. Acta Ecologica Sinica, 2016, 36(3):592.
[13]
张文文. 人工柠条林密度变化对土壤水分及其生长的影响[D]. 陕西杨凌:中国科学院教育部水土保持与生态环境研究中心, 2015:1. ZHANG Wenwen. The effects of Caragana plant density on soil water and plant growth[D]. Yangling, Shaanxi:Research Center for Soil and Water Conservation and Ecological Environment, Ministry of Education, Chinese Academy of Sciences, 2015:1.
[14]
宋乃平, 杨新国, 何秀珍, 等. 荒漠草原人工拧条林重建的土壤养分效应[J]. 水土保持通报, 2012, 32(4):21. SONG Naiping, YANG Xinguo, HE Xiuzhen, et al. Soil nutrient effect of desert steppe reconstructed by artificial Caragana microphylla stand[J]. Bulletin of Soil and Water Conservation, 2012, 32(4):21.
[15]
程积民, 杜峰. 黄土高原半干旱区集流灌草立体配置与水分调控[J]. 草地学报, 2000, 8(3):210. CHENG Jiming, DU Feng. Solid collocation of water collected shrub-grass and water regulation in semi-arid region of Loess Plateau[J]. Acta Agrestia Sinica, 2000, 8(3):210.
[16]
徐炳成, 山仑. 半干旱黄土丘陵区沙棘和柠条水分利用与适应性特征比较[J]. 应用生态学报, 2004, 15(11):2025. XU Bincheng, SHAN Lun.A comparative study on water use characteristics and eco-adaptability of Hippophae rhamnoides and Caragana korshinskii in semi-arid loess hilly-gully region[J]. Chinese Journal of Applied Ecology, 2004, 15(11):2025.
[17]
吕文强. 黄土高原石家岔小流域带状植物篱土壤水分空间分异特征[D]. 兰州:甘肃农业大学, 2016:2. LÜ Wenqiang. Spatial differentiation of soil moisture under banded hedgerows of Shijiacha small watershed in the Loess Plateau[D]. Lanzhou:Gansu Agricultural University, 2016:2.
[18]
VERSTEEG M N, KOUDOKPON V. Participative farmer testing of four low external input technologies, to address soil fertility decline in Mono province (Benin)[J]. Agricultural Systems, 1993, 42(3):265.
[19]
AGUS F, CASSEL D K, GARRITY D P. Soil-water and soil physical properties under contour hedgerow systems on sloping oxisols[J]. Soil & Tillage Research, 1997, 40(3/4):185.
[20]
曾辰, 邵明安. 黄土高原水蚀风蚀交错带柠条幼林地土壤水分的动态变化[J]. 干旱地区农业研究, 2006, 24(6):155. ZENG Chen, SHAO Mingan. Soil moisture variation of young Caranaga korshinskii artificial shrubland in the wing-water erosion crisscross region of the Loess Plateau[J]. Agricultural Research in the Arid Areas, 2006, 24(6):155.
[21]
王振凤, 郭忠升, 郭满才, 等. 黄土丘陵区柠条林地土壤水分垂直变化[J]. 水土保持通报, 2012, 32(6):71. WANG Zhengfeng, GUO Zhongsheng, GUO Mancai, et al. Vertical variations of soil water in shrubland of Caragana microphylla in hilly and gully areas of Loess Plateau[J]. Bulletin of Soil and Water Conservation, 2012, 32(6):71.
[22]
HUANG Z, TIAN F P, WU G L, et al. Legume grasslands promote precipitation infiltration better than Gramineous grasslands in arid regions[J]. Land Degradation and Development, 2017, 28(1):309.
[23]
MAZZACAVALLO M G, ANDREW K, MATTHEW G. Modelling water uptake provides a new perspective on grass and tree coexistence[J]. PLoS ONE, 2015, 10(12):e0144300.
[24]
YANG Z P, ZHANG Q, WANG Y L, et al.Spatial and temporal variability of soil properties under Caragana microphylla shrubs in the northwestern Shanxi Loess Plateau, China[J]. Journal of Arid Environments, 2011, 75(6):538.
[25]
CHAI Qinglin, MA Zhanying, AN Qiqi, et al. Does Caragana korshinskill plantation increase soil carbon continuously in a water-limited landscape on the Loess Plateau, China?[J]. Land Degradation and Development, 2019, 30(14):1691.
[26]
DENG Lei, HAN Qisheng, et al. Above-ground and below-ground ecosystem biomass accumulation and carbon sequestration with Caragana korshinskill Kom plantation development[J]. Land Degradation and Development, 2017, 28(3):906.
[27]
成向荣, 黄明斌, 邵明安. 沙地小叶杨和柠条细根分布与土壤水分消耗的关系[J]. 中国水土保持科学, 2008, 6(5):77. CHENG Xiangrong, HUANG Mingbin, SHAO Mingan. Relationship between fine roots distribution and soil water consumption of Populus simonii and Caragana korshinkii plantation on sandy land[J]. Science of Soil and Water Conservation, 2008, 6(5):77.
[28]
李毅, 邵明安. 雨强对黄土坡面土壤水分入渗及再分布的影响[J]. 应用生态学报, 2006, 17(12):2271. LI Yi, SHAO Mingan. Effects of rainfall intensity on rainfall in infiltration and redistribution in soil on loess slope land[J]. Chinese Journal of Applied Ecology, 2006, 17(12):2271.
[29]
苏子龙, 张兆辉, 于艳. 典型黑土区农业小流域不同坡向和坡位的土壤水分变化特征[J]. 中国水土保持科学, 2013, 11(6):39. SU Zilong, ZHANG Zhaohui, YU Yan. Variation of soil moisture with slope aspect and position in a small agricultural watershed in the typical black soil region[J]. Science of Soil and Water Conservation, 2013, 11(6):39.
[30]
党汉瑾, 党宏忠. 半干旱区柠条植物篱水分再分配格局研究[J]. 林业科学研究, 2014, 27(6):745. DANG Hanjin, DANG Hongzhong. Soil water redistribution pattern of Caragana intermedia hedgerows system in semi-arid area[J]. Forest Research, 2014, 27(6):745.
[31]
SVETLITCHNYI A A, PLOTNITSKIY S V, STEPOVAYA O Y. Spatial distribution of soil moisture content within catchments and its modeling on the basis of topographic data[J]. Journal of Hydrology, 2003, 277(1/2):50.
[32]
黄奕龙, 陈利顶, 傅伯杰, 等. 黄土丘陵小流域地形和土地利用对土壤水分时空格局的影响[J]. 第四纪研究, 2003, 23(3):334. HUANG Yilong, CHEN Liding, FU Bojie, et al.The influence of topography land use on soil moisture spatial-temporal pattern in the hilly area of Loess Plateau[J]. Quatemary Sciences, 2003, 23(3):334.
[33]
郭欣欣, 付强, 卢贺, 等. 东北黑土区农林混合利用坡面土壤水分空间异质性及主控因素[J]. 农业工程学报, 2018, 34(19):123. GUO Xinxin, FU Qiang, LU He, et al.Spatial variability and its controlling factors of soil moisture on cropland-forestland mixed hillslope in black soil area of Northeast China[J]. Transactions of the CSAE, 2018, 34(19):123.
2020, Vol. 18 
