黄土高原生态退耕的时空分异特征

杜国明, 孙晓兵, 刘彦随, 郑惠玉, 马榕徽

Temporal and Spatial-Differentiation Characteristics of Ecological Restoration in Loess Plateau

DU Guoming,SUN Xiaobing,LIU Yansui,ZHENG Huiyu,MA Ronghui

表1 高程与坡度分级标准及面积比例

Tab. 1 Classification and area proportion ofslope and altitude

地形要素 分级标准 级别 面积/km2 比例/% 高程/m 362~925 I 2581.96 7.00 925~1115 II 8003.76 21.69 1115~1275 III 9845.04 26.68 1275~1442 IV 9564.36 25.92 1442~1795 V 6907.07 18.72 坡度/° ≤2 1 1272.43 3.45 2~6 2 4184.40 11.34 6~15 3 14 443.46 39.14 15~25 4 13 046.39 35.35 >25 5 3955.50 10.72