黄土高原半湿润区刺槐树干液流对人工截留降雨输入及环境因子的响应

何秋月,闫美杰,张建国,杜盛

Sap flow of Robinia pseudoacacia in response to rainfall exclusion treatment and environment factors in a sub-humid area in Loess Plateau

Qiu-Yue HE,Mei-Jie YAN,Jian-Guo ZHANG,Sheng DU

表2 两个试验时段太阳辐射、空气水汽压亏缺、液流通量密度及比值(平均值±标准误差, n = 6)

Table 2 Solar radiation, vapor pressure deficit and sap flux densities (Fd) in the two study periods and their ratios (mean ± SE, n = 6)

测定时段 Study period 平均日总太阳辐射 Mean daily solar radiation (MJ·m-2·d-1) 平均空气水汽压亏缺 Mean vapor pressure deficit (kPa) 样树1-3平均液流通量密度 Mean sap flux density of sample tree 1-3 (mL·m-2·s-1) 样树4-6平均液流通量密度 Mean sap flux density of sample tree 4-6 (mL·m-2·s-1) 处理前 Before treatment (2014) 20.62 ± 1.69 0.65 ± 0.03 3.53 ± 2.67 2.42 ± 1.84 处理期 Treatment (2015) 21.96 ± 1.51 0.53 ± 0.0201 3.38 ± 2.93 1.64 ± 1.39 处理期/处理前Treatment/Before treatment 1.07 0.81 0.96 0.68