木麻黄南北方位边材液流季节动态及其对蒸腾耗水测算的影响  

Seasonal Dynamics and Azimuth Variations of Sapwood Flow in Casuarina equisetifolia and Their Effects on Transpiration Estimates

作　　者：尤龙辉[1] 

机构地区：[1]福建省林业科学研究院,福建福州350012

出　　处：《防护林科技》2013年第12期48-50,64,共4页Protection Forest Science and Technology

摘　　要：利用TDP径流计对福建沿海木麻黄南北方位的边材液流动态进行长期监测，并同步检测空气温湿度、太阳辐射等环境因子，分析南北方位液流速率的相互关系、对蒸腾耗水量测算的影响以及与环境因子的关系。结果显示，木麻黄南北2个方位测得的液流速率存在显著差异和线性相关。木麻黄生长季（5～10月）内单株蒸腾耗水量与日总太阳辐射和昼间平均空气水汽压亏缺的指数饱和曲线拟合效果较好。采用单方位树干液流速率测算的整株蒸腾耗水量与2个方位的测算值相差18．19％。Flow dynamics of sapwood in north-south orientation of Casuarina equisetifolia were chronically monitored by using thermal dissipation probe （TDP） in coastal Fujian .Air temperature and humidity ,solar radiation and other environmental factors were synchronous detected .The correlations between sap flow velocity at northern ＆ southern directions ,the correlations among sap flow and environmental factors ,and influence of different data source on the calculation of whole-tree transpiration were investigated .Result shows that sap flow velocity at two aspects （south , north） on the trunk were highly linearly correlated ,but were significantly different .Throughout the growing season （May to October） ,daily whole-tree transpiration could be well fitted to the daytime mean air vapor pressure deficit （VPD） and daily total solar radiation using exponential saturation functions .The differences relative to tree transpi-ration estimates based on sap flow velocity for two aspects are typically 18 .19% in accordance with the sap flow ve-locity for single measurement aspects .

关 键 词：方位差异 木麻黄 树干液流速率 蒸腾耗水 热扩散探头 

分 类 号：S792.93[农业科学—林木遗传育种]