毛乌素沙地不同类型生物结皮与下层土壤酶活性及土壤碳氮磷化学计量特征

樊瑾, 李诗瑶, 余海龙, 黄菊莹

Soil enzyme activity and carbon， nitrogen and phosphorus stoichiometric characteristics under different types of biocrusts and subsoil in Mu Us Sandland

Jin Fan, Shiyao Li, Hailong Yu, Juying Huang

表5 土壤环境指标作为解释变量的前向选择和蒙特卡罗检验分析

Table 5 Forward selection with Monte Carlo permutation test of soil environmental indicators as explanatory variables

参数 条件影响 多元相关 比率/% F P 全氮TN 0.921 93.6 293 0.002** 速效钾AK 0.026 2.6 11.9 0.002** 含水量SWC 0.009 0.9 4.9 0.030* 全磷TP 0.007 0.7 5.9 0.004** C/P 0.006 0.6 4.4 0.026* 有机碳SOC 0.005 0.5 2.9 0.056 碱解氮AN 0.004 0.4 2.6 0.082 pH 0.002 0.2 1.6 0.224 容重BD 0.001 0.1 0.8 0.438 速效磷AP 0.001 0.1 1.1 0.378 孔隙度Por 0.001 0.1 1.2 0.324 N/P 0.001 0.1 0.2 0.876