Responses of soil moisture to vegetation restoration type and slope length on the loess hillslope Responses of soil moisture to vegetation restoration type and slope length on the loess hillslope

最小化 最大化

Vol15 No.3: 548-562

【Title】Responses of soil moisture to vegetation restoration type and slope length on the loess hillslope

AuthorMEIXue-mei1; MA Lan1*; ZHU Qing-ke1; WANG Shu2; ZHANG Dong1; WANG Yu1

Addresses1 Key Laboratory of State Forestry Administration on Soil and Water Conservation, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China; 2 Haihe River Water Conservancy Commission, Ministry of Water Resources, Tianjin 300170, China

Corresponding authormlpcz@bjfu.edu.cn

【Citation】Mei XM, Ma L, Zhu QK, et al. (2018) Responses of soil moisture to vegetation restoration type and slope length on the loess hillslope. Journal of Mountain Science 15(3). https://doi.org/ 10.1007/s11629-017-4415-y

DOIhttps://doi.org/10.1007/s11629-017-4415-y

AbstractSoil moisture, a critical variable in the hydrologic cycle, is highly influenced by vegetation restoration type. However, the relationship between spatial variation of soil moisture, vegetation restoration typeandslope lengthiscontroversial. Therefore, soil moisture across soil layers (0-400 cm depth) was measuredbefore and after the rainy seasonin severe drought (2015) and normal hydrological year (2016) inthree vegetation restoration areas (artificial forestland, natural forestland and grassland), onthe hillslopes of the Caijiachuan Catchment inthe Loess area, China. The results showed that artificial forestlandhad the lowest soil moisture and most severe water deficit in 100-200 cm soil layers. Water depletion washigher in artificialand natural forestlandsthan in natural grassland. Moreover, soil moisture in the shallow soil layers (0-100 cm) underthe three vegetation restoration typesdid not significantly vary with slope length, but a significant increase with slope lengthwas observed in deep soil layers (below 100 cm). In 2015, a severe drought hydrological year, higher water depletion was observed at lower slope positions under three vegetation restoration types due to higher transpiration and evapotranspiration and unlikely recharge from upslope runoff. However, in 2016, a normal hydrological year, there was lower water depletion, even infiltration recharge at lower slope positions, indicating receiving a large amount of water from upslope. Vegetation restoration type, precipitation, slope length and soil depth during a rainy season, in descending order of influence, had significant effects on soil moisture. Generally, natural grassland is more beneficial for vegetation restoration than natural and artificial forestlands,and the results can provide useful information for understanding hydrological processes and improving vegetationrestoration practices on the Loess Plateau

KeywordsSpatial variation;Soil moisture;Infiltration depth; Hillslope; Vegetation restoration; Loess Plateau