摘要
以北京市大兴区榆伐镇大兴林场沙地杨树人工林107欧美杨(Populus×euramericanacv."74/76")为研究对象,采用热扩散式探针(TDP)结合HOBO自动气象站,于2011年3—7月对杨树树干液流及林地环境因子进行连续观测。结果表明:杨树春夏季边材液流的日变化均呈单峰曲线,夏季液流每天启动的时间早于春季3h左右,达到峰值的时间晚于春季1h左右,迅速下降的时间晚于春季2h左右,峰值和日平均液流速率小于春季;3—7月的月平均液流通量介于5.31～51.31cm3/h;平均液流通量夏季(47.92cm3/h)>春季(35.72cm3/h);日耗水量随胸径的增大而增加,与树干胸径和边材面积的相关性达极显著水平(p<0.01),相关系数分别为0.956和0.984。杨树边材液流速率和液流通量的季节变化说明杨树夏季蒸腾量大,是水分管理的关键时期。
The environmental factors and stem sap flow dynamics of planted poplar（Populus×euramericanacv.＂74/76＂） were investigated through March to July 2011 with thermal dissipation probe（TDP） and the data from automatic weather station（HOBO）.Results showed that the daily changes of sap flow exhibited single peak pattern both in spring and summer.Daily sap flow started 3 h earlier in summer than in spring,reached peak 1 h later in summer than in spring,and rapid decrease was 2 h later in summer than that in spring.Both maximum and average values of sap flow velocity were lower in summer than that in spring.Monthly sap flow velocity varied between 5.31 cm3/h and 51.31 cm3/h from March to July.The average sap flow（47.92 cm3/h） was higher in summer than that in spring（35.72 cm3/h）.Daily water consumption significantly correlated with trunk diameter at breast height and sapwood area with the correlation coefficients of 0.956 and 0.984,respectively.Seasonal sap flow variation of poplar indicated that summer was the key period for water management due to high transpiration.
出处
《水土保持研究》
CSCD
北大核心
2013年第3期167-171,共5页
Research of Soil and Water Conservation
基金
北京市自然科学基金项目"北京沙地杨树人工林生态系统水分利用研究"(6102005)
关键词
杨树人工林
热扩散法
树干液流
耗水
planted poplar
thermal dissipation probe
stem sap flow
water consumption
