我国北方农牧交错带西段退耕对土壤保持功能影响研究

殷小菡, 孙希华, 徐新良, 张雪艳, 陈德超

The Impact of Returning Farmland on Soil Conservation Function in the Western Region of Farming-pastoral Ecotone of Northern China

YIN Xiaohan,SUN Xihua,XU Xinliang,ZHANG Xueyan,CHEN Dechao

表4 2000-2015年不同坡度退耕还林（草）面积及其引起的土壤保持量变化

Tab. 4 The area of GGP and the variation of soil conservation degree in different slope from 2000 to 2015

坡度/° 各坡度等级面积/km2 退耕还林（草） 土壤保持量 面积/km2 占比/% 变化/104t 占比/% <5 91 670.36 1136.94 1.24 11.35 15.85 5~10 49 072.63 515.92 1.05 5.15 10.01 10~15 19 279.02 180.65 0.94 1.80 8.11 15~20 8554.33 90.61 1.06 0.90 7.30 20~25 4327.15 51.02 1.18 0.51 7.10 >25 4977.66 63.63 1.28 0.63 7.99