黄土丘陵区刺槐和侧柏人工林树干液流特征及其对降水的响应

吴旭, 陈云明, 唐亚坤

Sap flow characteristics and its responses to precipitation in Robinia pseudoacacia and Platycladus orientalis plantations

WU Xu,CHEN Yun-Ming,TANG Ya-Kun

表2 生长季内不同生长时期降水前后液流密度(Fd)和蒸腾变量(VT)的拟合结果

Table 2 Sap flow density (Fd) in relation to transpiration (VT) of pre- and post-precipitation days in different growth periods during the growing season

树种 Species 月份 Month 降水前 Pre-precipitation 降水后 Post-precipitation 拟合参数检验 Difference between coefficients 刺槐 Robinia pseudoacacia 4-6月 Apr.-June a = 0.07597 b = 0.01751 R2 = 0.93595 p < 0.001 a = 0.08689 b = 0.02463 R2 = 0.90636 p < 0.001 p < 0.001 p < 0.001 7-8月 July-Aug. a = 0.10655 b = 0.06804 R2 = 0.85815 p < 0.001 a = 0.10735 b = 0.07429 R2 = 0.92151 p < 0.001 p = 0.064 p = 0.064 9-10月 Sept.-Oct. a = 0.0665 b = 0.08483 R2 = 0.8779 p < 0.001 a = 0.10192 b = 0.06069 R2 = 0.67764 p < 0.001 p < 0.001 p < 0.001 侧柏 Platycladus orientalis 4-6月 Apr.-June a = 0.01478 b = 0.01808 R2 = 0.27474 p < 0.001 a = 0.01916 b = 0.02917 R2 =0.39464 p < 0.001 p < 0.01 p < 0.01 7-8月 July-Aug. a = 0.02437 b = 0.05265 R2 = 0.64406 p < 0.001 a = 0.02851 b =0.05112 R2 = 0.83689 p < 0.001 p < 0.05 p < 0.05 9-10月 Sept.-Oct. a = 0.02438 b = 0.01681 R2 = 0.81975 p < 0.001 a = 0.03512 b = 0.02075 R2 = 0.57574 p < 0.001 p < 0.001 p < 0.001