摘要
应用新型的坡面人工模拟降雨条件下径流-入渗-产流测量仪器,野外测定了宁夏南部山区不同植被下不同雨强的土壤入渗性能,并分析了不同植被下土壤团聚体含量与土壤稳渗率的关系.结果表明,不同植被类型土壤入渗率与降雨历时之间的关系曲线均符合幂函数y=a+be-cx(R2=0.9678～0.9969).随着雨强的增大,坡耕地的土壤稳渗率降低,而苜蓿地、天然草地及柠条林地则增大.20mm.h-1雨强下,土壤降雨入渗转化率依次为苜蓿地>坡耕地>天然草地>柠条林地;40和56mm·h-1雨强下,土壤降雨入渗转化率依次为苜蓿地>天然草地>坡耕地、柠条林地;土壤降雨入渗转化率随着雨强的增大而降低.坡耕地退耕后,随着植被的恢复,土壤>0.25mm水稳性团聚体含量增加,土壤入渗性能提高.研究区植被的恢复与重建改善了土壤结构、提高了土壤入渗性能和坡面降雨利用潜力.
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 R^2 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 After the 〉 slope cropland 〉 C. korshinskii reversion of cropland to grassland land, and decreased with increasing rainfall intensity. 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.
出处
《应用生态学报》
CAS
CSCD
北大核心
2008年第5期1040-1045,共6页
Chinese Journal of Applied Ecology
基金
国家科技支撑计划重大项目(2006BCA01A07)
国家高技术研究发展计划项目(2006AA100219)
中国科学院-水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室基金资助项目(105012152)
关键词
宁夏南部
黄土丘陵区
植被类型
土壤入渗性能
southern Ningxia
loess hilly region
vegetation type
soil infiltration capacity.
