利用热扩式边材液流探针TDP测定树木.pdfVIP

植物生态学报 2002，26(6)661～667 Acta Phytoecologica Sinica 利用热扩式边材液流探针(TDP)测定树木 整株蒸腾耗水量的研究 王华田 马履一2 (1山东农业大学林学院，山东泰安 271018) (2北京林业大学，北京 100083) 摘 要 介绍了热扩散式液流探针的工作原理及利用液流探针测定树木边材液流速率的方法。利用边材液流探 针和多种气象因子传感器及数据采集系统组成的微型气象站，通过对北京西山地区油松(P／nus tabu／aeform／s)、栓皮 栎( var／ab／／／s)混交林林分平均木树干边材液流速率及风速、有效辐射和空气温度、空气相对湿度的日变化和 连日变化的测定和分析，揭示了5月干旱季节两树种蒸腾耗水的日变化和连日变化规律，以及栓皮栎树干基部和 树冠大枝边材液流的差异，并进行了理论推导，同时分析了液流速率的波动规律与主要气象因素波动的相关性。 关键词 热扩散边材液流探针 边材液流速率 液流通量 树木耗水性 微型气象站 油松 栓皮栎 MEASUREMENT OFⅥⅢOI甩 rI1RJ ’S、vATER CoNSU]Ⅵ 【ION W删 THERMAL I S A [0lN SAP LoW P】R()BE(1 IP) WANG Hua-Tian and MA Ln．Yi (1 Forestry ，ShandongAgricultural University，Taian，Shaadong 271018，China) (2 Resource and Environment College，ne~i．g Forestry University，~iiing 100083，China) Abstract Traditional singletree water consumption acquired by means of the scaling．up method from leaflet transpiration measurement，caused serious deviation to the very value．The whole tree water consumption by crown transpiration is closely approximated to the same of sap flow rate in the tnmk sapwood which was mea． sured by thermal dissipation probe(TDP)implanted in the trunk．The forest community water consumption can be acquired by scaling-up of singletree water consumption．Spatial-and-temporal sap flow velocity(SFv)fluc- tuation in the sapwood at lower and upper trunk position of O,erc,~variabilis and Pinus tabulacformis，and other meteorological factors，such as solar radiation intensity，air humidity，air temperature，wind soeed and soil temperature were measured in a 48 year-old mixed stand at an east hill slope．in the Forest Research St