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    张璇, 张会兰, 王玉杰, 王云琦, 刘春霞, 杨坪坪, 潘声雷. 缙云山典型树种树干液流日际变化特征及与气象因子关系[J]. 北京林业大学学报, 2016, 38(3): 11-20. DOI: 10.13332/j.1000-1522.20150389
    引用本文: 张璇, 张会兰, 王玉杰, 王云琦, 刘春霞, 杨坪坪, 潘声雷. 缙云山典型树种树干液流日际变化特征及与气象因子关系[J]. 北京林业大学学报, 2016, 38(3): 11-20. DOI: 10.13332/j.1000-1522.20150389
    ZHANG Xuan, ZHANG Hui-lan, WANG Yu-jie, WANG Yun-qi, LIU Chun-xia, YANG Ping-ping, PAN Sheng-lei. Characteristics of daily sap flow for typical species in Jinyun Mountain of Chongqing in relation to meteorological factors[J]. Journal of Beijing Forestry University, 2016, 38(3): 11-20. DOI: 10.13332/j.1000-1522.20150389
    Citation: ZHANG Xuan, ZHANG Hui-lan, WANG Yu-jie, WANG Yun-qi, LIU Chun-xia, YANG Ping-ping, PAN Sheng-lei. Characteristics of daily sap flow for typical species in Jinyun Mountain of Chongqing in relation to meteorological factors[J]. Journal of Beijing Forestry University, 2016, 38(3): 11-20. DOI: 10.13332/j.1000-1522.20150389

    缙云山典型树种树干液流日际变化特征及与气象因子关系

    Characteristics of daily sap flow for typical species in Jinyun Mountain of Chongqing in relation to meteorological factors

    • 摘要: 运用Granier热扩散探针方法,于2012—2015年8—9月对重庆缙云山自然保护区内3个典型优势木(杉木、马尾松、四川山矾)的树干液流进行测定,并运用微型气象站同步监测太阳辐射(ES)、大气温度(T)、大气相对湿度(RH)、风速(W)、饱和水汽压差(VPD)等气象因子及土壤含水量(SWC),分析3个树种的树干液流在日尺度及典型天气条件(晴、阴、雨)下的差异和特征及其与气象因子的关系。结果表明:树种间导水能力差异表现为四川山矾>马尾松>杉木,阔叶树种蒸腾速率高于针叶树种;3个树种树干液流日变化规律均呈现“昼高夜低”的单峰走势;液流启动时间和达到峰值时间均为山矾最早,杉木最晚;典型天气条件下3个树种液流量均呈现晴天>阴天>雨天,与晴天液流量相比较,阴、雨天液流量减少幅度为41%至86%;白天树干液流贡献率表现为晴天(94.74%~98.04%)>阴天(93.63%~96.71%)>雨天(81.43%~85.43%),夜晚树干液流贡献率表现为雨天(14.57%~18.27%)>晴天(3.29%~6.37%)>阴天(1.96%~5.26%);导致雨天夜间液流贡献率最大的因子为SWC;影响3个树种树干液流的主要气象因子为ES和VPD;T、RH、W对3个树种的影响程度都很小,且略有不同。气象因子与杉木、马尾松、四川山矾的树干液流多元回归方程决定系数分别为0.873、0.873、0.903。

       

      Abstract: Using Granier-type thermal dissipation probes,we monitored sap flux density (Fd) of three species (Cunninghamia lanceolata, Pinus massoniana, and Symplocas setchuensis) in August and September during 2012--2015 in Jinyun Mountain of Chongqing, southwestern China. Solar radiation (ES), atmospheric temperature (T), atmospheric relative humidity (RH), wind speed (W), vapour pressure deficiency (VPD) and soil water content (SWC) synchronously with Fd were monitored by mini weather station. Sunny day, cloudy day and rainy day were chosen as three typical weather conditions. We aimed to analyze the differences and characteristics of sap flow among three species and among the three typical weather conditions, and to clarify the relationship between Fd and meteorological factors. The results showed that water transpiration ability of xylem for the three species was ranked as S. setchuensis>P. massoniana>C. lanceolata. Transpiration velocity of broadleaf species was higher than that of coniferous species. The variations of Fd for the three species all displayed single-peaked curves. S. setchuensis was the first one to start transpiration and reach the peak value of Fd, while C. lanceolata was the last. Sap flow for the three species under different weather conditions followed the order of sunny day>cloudy day>rainy day. Compared with sunny day sap flow, the extent of sap flow decreased on cloudy and rainy days ranged from 41% to 86%. The order of contribution rate of diurnal sap flow to whole day transpiration was sunny day (94.74%-98.04%)>cloudy day (93.63%-96.71%)>rainy day (81.43%-85.43%), and that of nighttime sap flow contribution was rainy day (14.57%-18.27%)>sunny day (3.29%-6.37%)>cloudy day(1.96%-5.26%). SWC was the major factor affecting the nighttime sap flow contribution on rainy days. ES and VPD were major meteorological factors affecting Fd. W, T and RH had little effect on Fd , and there were some differences among these three species. The regression models to relate Fd with meteorological parameters can well explain the changes of sap flow, in which coefficients of determination were 0.873, 0.873 and 0.903.

       

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