氮肥添加对川西北高寒草甸植物群落根系动态的影响

字洪标,陈焱,胡雷,王长庭

Effects of nitrogen addition on root dynamics in an alpine meadow, Northwestern Sichuan

Hong-Biao ZI,Yan CHEN,Lei HU,Chang-Ting WANG

表4 土壤理化性质与根系特征的相关性(n = 6)

Table 4 Pearson correlation analysis between soil physicochemical properties and root characteristics (n = 6)

土层 Soil layer 项目名称 Item pH值 pH value 有机质 SOM (g·kg-1) 速效氮 AN (mg·kg-1) 全氮 TN (mg·kg-1) 0-10 cm 根系现存量 Root standing crop -0.27 -0.414 0.487 0.622* 根系生产量 Root production 0.280 -0.421 -0.843** -0.167 根系死亡量 Root mortality 0.315 -0.044 0.716** 0.021 根系周转率 Root turnover -0.459 -0.225 0.673* 0.691* 10-20 cm 根系现存量 Root standing crop -0.075 -0.590* -0.684* 0.624* 根系生产量 Root production 0.371 0.005 -0.413 0.095 根系死亡量 Root mortality -0.095 -0.038 -0.404 0.300 根系周转率 Root turnover -0.193 -0.476 0.287 0.293