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3 不同N添加梯度和土层深度对根系特征的方差分析(n = 6)

Table 3 ANOVA of on the dynamic of plant roots of the different N addition gradients (n = 6)

因子 Factor 处理 Treatment 深度 Depth 处理×深度 Treatment × Depth F p F p F p 累积根系生产量 Cumulative root production 1.328 0.300 47.14 < 0.001 2.661 0.083 平均根系现存量 Mean root standing crop 1.770 0.190 29.93 < 0.001 1.237 0.329 根系周转 Root turnovers 1.655 0.220 0.689 0.420 1.573 0.235 累积根系死亡量 Cumulative root mortality 3.280 0.050 38.11 < 0.001 2.538 0.093