摘要
以北京市大兴区榆伐镇大兴林场沙地107欧美杨(Populus×euramericanacv."74/76")人工林为研究对象,运用热扩散法(TDP)并结合自动气象站(HOBO)的连续观测,基于连续1a(2011.1—2011.12)的树干液流密度和空气温、湿度(Ta,RH)、太阳辐射(Rs)、土壤温度(T)、土壤含水量(SWC)和风速(w)等环境因子的测定数据,探讨月尺度下树干液流密度与环境因子的关系。结果表明:太阳辐射、空气温度、土壤温度和风速的最大均值分别是326.25W.m-2、21.66℃、24.16℃和1.1m.s-1,土壤含水量和空气湿度的最小均值分别是0.054m3.m-3和54.1%;各环境因子与液流密度均呈良好的三次曲线关系,R>0.714;太阳辐射、空气温度、土壤温度、风速与液流密度呈正相关,相关系数分别为0.82、0.705、0.962、0.578,土壤含水量、空气湿度与液流密度呈负相关,相关系数为-0.24和-0.911。可见,空气湿度、土壤温度和太阳辐射是影响液流最主要的因素。
Taking a poplar plantation（Populus×euramericana cv.＂74/76＂） located in Yufa Towship of Daxing District,Beijing as research object,differences in the relationship between the stem sap flow density and environmental factors（including air temperature and humidity,solar radiation,soil temperature,soil water content,and wind speed） were investigated based on the monthly scaled data obtained from a one year continuous observation during January to December 2011 by adopting thermal dissipation probe combined with continuous observation of automatic weather station.With the similar stem sap flow,the average maximum values of solar radiation,air temperature,soil temperature and wind speed were 326.25 W·m^-2,21.66 ℃,24.16 ℃ and 1.1 m·s^-1,respectively,and the average minimum values of soil water content and air humidity were 0.054 m^3·m^-3 and 54.1%.respectively.Each environmental factor and sap flow density showed good cubic curve relationship with R0.714.Factors such as the solar radiation,air temperature,soil temperature and wind speed were positively correlated with the sap flow density,with the correlation coefficients of 0.82,0.705,0.962,and 0.578,respectively.The soil water content and the air humidity were negatively correlated to the sap flow density,with correlation coefficients of-0.24 and-0.911.It can be seen that the air humidity,soil temperature and solar radiation are the most important factors affecting the sap flow.
出处
《西北林学院学报》
CSCD
北大核心
2013年第3期40-45,52,共7页
Journal of Northwest Forestry University
基金
北京市自然科学基金(6102005)
关键词
杨树人工林
热扩散法
环境因子
液流密度
poplar plantation
thermal dissipation probe
environmental factor
sap flow density
