Yang Yong-Hui, Zhao Shi-Wei, Lei Ting-Wu, Liu Han
State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling 712100, Shaanxi, China.
Ying Yong Sheng Tai Xue Bao. 2008 May;19(5):1040-5.
A new apparatus for measuring the run off-on-out under simulated rainfall conditions was used to study the soil infiltration capacity under different rainfall intensities and vegetations in loess hilly region of southern Ningxia, with the relationships between soil water-stable aggregate content and soil stable infiltration rate under different vegetations analyzed. The results showed that the regression equations between rainfall duration and soil infiltration rate under different vegetations all followed y = a + be(-cx), with R2 ranged from 0.9678 to 0.9969. With the increase of rainfall intensity, the soil stable infiltration rate on slope cropland decreased, while that on Medicago lupulina land, natural grassland, and Caragana korshinskii land increased. Under the rainfall intensity of 20 mm h(-1), the rainfall infiltration translation rate (RITR) was decreased in the order of M. lupulina land > slope cropland > natural grassland > C. korshinskii land; while under the rainfall intensity of 40 mm h(-1) and 56 mm h(-1), the RITR was in the sequence of M. lupulina land > natural grassland > slope cropland > C. korshinskii land, and decreased with increasing rainfall intensity. After the reversion of cropland to grassland and forest land, and with the increase of re-vegetation, the amount of >0.25 mm soil aggregates increased, and soil infiltration capacity improved. The revegetation in study area effectively improved soil structure and soil infiltration capacity, and enhanced the utilization potential of rainfall on slope.
利用一种新型的模拟降雨条件下测量径流-入渗-出流的装置，研究宁夏南部黄土丘陵区不同降雨强度和植被覆盖下的土壤入渗能力，并分析了不同植被覆盖下土壤水稳性团聚体含量与土壤稳定入渗率之间的关系。结果表明，不同植被覆盖下降雨历时与土壤入渗率的回归方程均符合y = a + be(-cx)，R2范围为0.9678至0.9969。随着降雨强度的增加，坡耕地土壤稳定入渗率降低，而天蓝苜蓿地、天然草地和柠条林地的土壤稳定入渗率增加。在20 mm h(-1)的降雨强度下，降雨入渗转化率（RITR）依次为天蓝苜蓿地＞坡耕地＞天然草地＞柠条林地；而在40 mm h(-1)和56 mm h(-1)的降雨强度下，RITR依次为天蓝苜蓿地＞天然草地＞坡耕地＞柠条林地，且随降雨强度增加而降低。坡耕地退耕还林还草后，随着植被恢复程度的增加，>0.25 mm土壤团聚体数量增加，土壤入渗能力提高。研究区植被恢复有效改善了土壤结构和土壤入渗能力，增强了坡面降雨利用潜力。
