摘要
北京山区落叶阔叶林优势种——核桃楸在生长中期没有水分亏缺的条件下,树干的液流速率在很大程度上为微气候因子所决定,特别是大气相对湿度、温度和太阳辐射强度等。核桃楸树干液流速率的日进程和大气相对湿度、温度的日进程具有很好的生态学同步性。在一天中树干液流速率会出现数次波动,有多个峰值,最高峰一般出现在15:00左右,可达到1600g/h。在夜晚时核桃楸树干液流速率非常低,一般在50g/h 以下,但总是存在,据此判断核桃楸存在根压。
Under no water deficit,the sap flow of Juglans mandshurica is affected by microclimatic factors,especially the relative humidity,air temperature and solar radiation.The diurnal pattern of sap flow rate of Juglans mandshurica is similar with that of air temperature and relative humidity. Juglans mandshurica has several sap flow rate peaks with the maximums value of 1600g/h,occurring at 15:00.At the night time,the flow still happens,indicating that the root pressure of Juglans mandshurica functions.
出处
《生态学报》
CAS
CSCD
北大核心
1999年第6期793-797,共5页
Acta Ecologica Sinica
基金
国家自然基金
关键词
北京山区
落叶阔叶林
核桃楸
树干液流
Beijing Mountain area
deciduous broad leaf forest
Juglans mandshurica
sap flow