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黄土丘陵区刺槐树干液流动态分析 被引量:23

Dynamic changes of Robinia pseudoacacia sap flow in hilly-gully region of Loess Plateau
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摘要 2009年4月14日—10月10日,利用热扩散式液流探针(thermal dissipation probe,TDP)对延安市燕沟流域刺槐生长期树干边材液流进行连续监测,并同步监测光合有效辐射、气温、空气相对湿度、风速和降雨量等气象因子.结果表明:刺槐树干液流流速日变化呈单峰曲线,且不同季节液流的日动态变化存在明显差异.叶芽期(4月)液流启动时间在12:00左右,液流达到峰值的时间为18:00左右;5—8月液流启动时间提前到5:30—7:30,液流达到峰值的时间提前至15:00左右;9月以后,液流启动时间在8:00左右,液流达到峰值的时间提前至11:30—13:00.树干液流流速月平均值总体上呈"低-高-低"趋势,其中,4月的平均液流流速最小,为0.000549cm.s-1,8月最大,为0.002610cm.s-1.树干液流速率与气象因子密切相关,其相关性程度依次为:温度>水汽压亏缺>光合辐射强度>相对湿度>风速,且可用光合辐射强度和水汽压亏缺线性表达式来估测,其多元线性回归模型达到极显著水平(P<0.001). From April 14 to October 10,2009,the dynamic changes of Robinia pseudoacacia sap flow in the hilly-gully region of Loess Plateau were measured with thermal dissipation probe. Meantime,the photosynthetic active radiation (PAR),air temperature,relative air humidity,water vapor pressure deficit (VPD),wind speed,and rainfall were monitored. The diurnal variation of the sap flow velocity (SFV) displayed a single-peak curve,but the pattern varied among different months. In April,the sap flow started to increase at about 12:00,and reached the peak at about 18:00. From May to August,the sap flow started to increase at 5:30—7:30,and reached the peak at about 15:00. In September and October,the sap flow started to increase at about 8:00,and reached the peak at 11:30—13:00. The monthly average SFV was the highest in August and the lowest in April,with the value being 0.002610 cm·s-1 and 0.000549 cm·s-1,respectively. During the monitoring period,the sap flow velocity was significantly correlated with PAR,air temperature,VPD,wind speed,and air relative humidity,and the correlation coefficients declined in the order of air temperatureVPDPARrelative humiditywind speed. The sap flow velocity could be estimated by the linear equation with variables PAR and VPD,and the regression coefficients were highly significant.
出处 《应用生态学报》 CAS CSCD 北大核心 2010年第6期1367-1373,共7页 Chinese Journal of Applied Ecology
基金 中国科学院知识创新工程"百人计划"项目(KZCX2-YW-BR-02) 中国科学院"西部之光"项目(2007ZD02)资助
关键词 刺槐 树干液流变化 热扩散式探针 气象因子 Robinia pseudoacacia sap flow thermal dissipation probe climatic factor.
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