摘要
为了探索半干旱黄土丘陵区典型覆盖措施下土壤水分恢复的特征,采用野外大型土柱定位观测了几种覆盖下土壤水分的变化,结果表明:(1)与裸地相比,薄膜覆盖下土壤水分增加最显著,其次为树枝覆盖;(2)从土壤水分的含量来看,裸地在当地有利于土壤水分的恢复;(3)从逐月累计土壤储水增量来看,经过一个生育期,不同处理下土壤储水增量均有不同程度的增加,到9月份时,薄膜覆盖>树枝覆盖>裸地>早熟禾。三种无植物处理下土壤储水增量随着时间的变化呈直线上升的关系,其中薄膜覆盖与逐月累计降雨量关系最紧密。有植物种植的处理中(早熟禾),土壤储水增量与时间呈非线性关系;(4)随着土层的增加,变异系数逐渐减小,早熟禾和裸地在200cm以下,基本达到稳定,树枝覆盖在240cm以下达到稳定,薄膜覆盖大概在340cm以下达到稳定。
This study aimed to analyze soil water recovery ability under different typical mulches in the hilly loess region and adopted the large soil columns to observe soil water contents in the field. Results showed that soil water content significantly increased under plastic film mulch compared with barren land. Weeding was beneficial to soil water recovery in the local area. Accumulative storage of soil water increased during growth period, which decreased in the order of film mulching）branches mulching^barren land）bluegrass planting at the end of September. Increment accumulative storage of soil water under four no-plant treat- ments has linear relations with the month change and plastic film mulch has the close relationship with monthly accumulative rainfall, but accumulative storage of soil water under bluegrass planting has the non- linear relationship with rainfall. With the increase of soil layers, variable coefficient became less gradually, and the variable coefficients became steady below the depth of 200 cm in bluegrass and barren lands~ the sta- ble depths under branch mulch and plastic film mulch were 240 cm and 340 cm, respectively.
出处
《水土保持研究》
CSCD
北大核心
2015年第2期334-339,共6页
Research of Soil and Water Conservation
基金
国家科技支撑计划资助项目(2011BAD29B04
2013BAD20B03)
关键词
黄土高原
土壤水分
典型覆盖
变异系数
hilly loess region
soil water content
typical mulch
variable coefficient
