草地植被恢复对次降雨土壤水分动态的影响分析  

Effects of Vegetation Restoration on Soil Water Dynamics of Individual Rainfall in Typical Steppe

作　　者：张扬[1,2] 赵世伟[1] 侯庆春[1] 

机构地区：[1]中国科学院水利部水土保持研究所,陕西杨陵712100 [2]中国科学院研究生院,北京100049

出　　处：《水土保持研究》2009年第3期70-73,共4页Research of Soil and Water Conservation

基　　金：国家“十一五”科技支撑计划课题(2006BCA010A07,2006BAD09B08)

摘　　要：通过对宁南典型草原植被恢复过程次降雨土壤水分动态的研究,阐明植被恢复对次降雨后土壤水分的影响及机理。结果表明,次降雨提高了土壤含水率和贮水量,均表现出1 d〉3 d〉7 d。草地封育能够提高次降雨资源化效率,随封育时间延长,次降雨后0-60 cm土壤含水率和0-100 cm土壤贮水量不断提高。降雨对封育草地土壤水分的影响范围在100 cm土层内,100 cm以下不能得到降雨的补充。封育时间延长土壤水分活跃层加深,坡耕地仅为40 cm,封育17 a后达到60 cm。土壤持水能力越强,表层土壤饱和导水率越大,雨后1 d在0-100 cm土壤贮水量越大。地上生物量愈大,雨后1～7 d在0-200 cm土壤耗水量越大。Soil water dynamics of individual rainfall during the process of vegetation restoration in typical steppe was studied in the mountain area of southern Ningxia, and elucidated the effects and mechanism of vegetation restoration. The results show the soil moisture content and soil moisture storage was enhanced by individual rainfall in different period of closing, manifested as 1 d〉3 d〉7 d. Enclosed steppe improve resource utilization rate of individual rainfall, soil moisture in 0-60 cm and soil moisture storage in 0-100 cm increased with period of closing. There was no effects of supplementary irrigation under depth 100 cm. The enclosed time longer, the deeper water active layer was. The water active layer, which reached 0-60 cm after 17-year of closing, was 0-40 cm in slope farmland. Soil structure was the key influencing factor of the soil moisture storage in 0-100 cm on the first day after individual rainfall. From the first day to the seventh day after individual rainfall, the biomass was higher, the more the soil water was consumed in 0-200 cm.

关 键 词：次降雨 植被恢复 入渗 土壤水分 

分 类 号：S812[农业科学—草业科学] S152.7[农业科学—畜牧学]