科尔沁沙地沙漠化过程中土壤有机碳含量变化特征及影响因素
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闫蒙, 王旭洋, 周立业, 李玉强
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Characteristics and influencing factors of soil organic carbon in the process of desertification in Horqin Sandy Land
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Meng Yan, Xuyang Wang, Liye Zhou, Yuqiang Li
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表7 不同土层土壤有机碳与环境因子主成分( F )分析
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Table 7 Principal component analysis of soil organic carbon and environmental factors in different soil layers
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变量 | 0—10 cm | 10—20 cm |
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F1 | F2 | F3 | F4 | F1 | F2 | F3 | F4 |
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纬度 | 0.448 | -0.048 | -0.791 | 0.314 | 0.442 | -0.053 | -0.823 | 0.188 | 经度 | 0.921 | 0.024 | 0.080 | 0.123 | 0.920 | 0.049 | 0.060 | 0.108 | 年降水量 | 0.645 | 0.236 | 0.269 | -0.168 | 0.637 | 0.257 | 0.277 | -0.106 | 年积温 | 0.480 | 0.156 | 0.367 | 0.469 | 0.496 | 0.172 | 0.309 | 0.453 | 高程 | -0.926 | 0.017 | 0.003 | -0.280 | -0.933 | -0.005 | 0.041 | -0.238 | 地面剖面曲率 | -0.073 | 0.802 | -0.102 | 0.029 | -0.091 | 0.798 | -0.128 | 0.009 | 地面粗糙度 | -0.310 | 0.883 | 0.059 | 0.206 | -0.323 | 0.872 | 0.026 | 0.255 | 坡度 | -0.398 | 0.831 | 0.029 | 0.162 | -0.413 | 0.817 | 0.007 | 0.223 | 生长季平均气温 | 0.720 | -0.053 | 0.130 | 0.427 | 0.739 | -0.037 | 0.075 | 0.380 | 生长季降水量 | 0.192 | -0.111 | 0.917 | -0.115 | 0.204 | -0.084 | 0.928 | -0.030 | 生长季EVI均值 | 0.674 | 0.391 | -0.040 | -0.482 | 0.649 | 0.414 | -0.024 | -0.554 | 生长季NDVI均值 | 0.737 | 0.367 | -0.118 | -0.454 | 0.712 | 0.389 | -0.101 | -0.520 | 特征值 | 4.695 | 2.500 | 1.851 | 1.191 | 4.729 | 2.515 | 1.804 | 1.171 | 解释变量/% | 36.112 | 19.232 | 14.236 | 9.163 | 36.374 | 19.347 | 13.876 | 9.006 | 累计解释变量/% | 36.112 | 55.343 | 69.579 | 78.743 | 36.374 | 55.721 | 69.597 | 78.603 |
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