基于随机森林模型的内陆干旱区植被指数变化与驱动力分析: 以北天山北坡中段为例

张文强, 罗格平, 郑宏伟, 王浩, HAMDI Rafiq, 何惠丽, 蔡鹏, 陈春波

Analysis of vegetation index changes and driving forces in inland arid areas based on random forest model: a case study of the middle part of northern slope of the north Tianshan Mountains

ZHANG Wen-Qiang, LUO Ge-Ping, ZHENG Hong-Wei, WANG Hao, HAMDI Rafiq, HE Hui-Li, CAI Peng, CHEN Chun-Bo

表2 2000-2015年北天山北坡中段研究区归一化植被指数(NDVI)影响因子的多元线性回归系数

Table 2 Regression coefficient of each independent variable of normalized differential vegetation index (NDVI) of the middle part of northern slope of the north Tianshan Mountains from 2000 to 2015

自变量 Independent variable 回归系数 Regression coefficient 2000 2005 2010 2015 年最低气温 Annual minimum temperature 0.134 0.156 0.127 0.162 年平均气温 Annual average temperature -0.160 -0.139 -0.122 -0.245 年最高气温 Annual maximum temperature 0.026 -0.014 -0.013 0.072 年累计降水量 Annual cumulative precipitation 0.000 2 0.000 3 0.000 03 0.000 001 耕地比例 Arable proportion 0.005 0.005 0.005 0.005 林地比例 Forest proportion 0.005 0.005 0.007 0.007 草地比例 Grassland proportion 0.002 0.001 0.001 0.001 水体比例 Water body proportion -0.001 -0.001 -0.001 -0.002 城市比例 Urban proportion 0.003 0.002 0.002 0.002 荒漠比例 Desert proportion 0.001 0.000 1 -0.000 4 -0.000 3 放牧强度 Grazing intensity 0.054 0.038 0.053 0.044 常数项 Constant 0.617 0.983 0.981 0.634