毛乌素沙地旱柳和小叶杨树干液流密度及其与气象因子的关系  

Relationships between Sap Flow Densities in Tree Trunks of Salix matsudana and Populus simonii and Meteorological Factors in the Mu Us Sandland

作　　者：徐丹丹[1] 尹立河[2] 侯光才[2] 王文科[1] 黄金廷[2] 王晓勇[2] 张俊[2] 马洪云[2] 李成柱[2] 董佳秋[2] XU Dan-dan YIN Li-he HOU Guang-cai WANG Wen-ke HUANG Jin-ting WANG Xiao-yong ZHANG Jun MA Hong-yun LI Cheng-zhu DONG Jia-qiu(（ 1. College of Environmental Science and Engineering, Chang＇an University, Xi＇an 710054, Shaanxi, China Xi＇an Center.Key Laboratory of Groundwater and Ecology in Arid and Semiarid Regions, China Geological Survey, Xi＇an 710054, Shaanxi, China)

机构地区：[1]长安大学环境科学与工程学院,陕西西安710054 [2]中国地质调查局西安地质调查中心,中国地质调查局干旱-半干旱区地下水与生态重点实验室,陕西西安710054

出　　处：《干旱区研究》2017年第2期375-382,共8页Arid Zone Research

基　　金：国家自然科学基金项目(41472228);中国地质调查局地质调查项目(12120113104100)

摘　　要：研究毛乌素沙地旱柳(Salix matsudana)和小叶杨(Populus simonii)树干液流密度的变化特征及其与气象因子的关系,是实现该地区水与生态和谐发展的基础。利用Granier热消散探针法测量了旱柳和小叶杨不同方向和不同深度的树干液流密度。监测结果表明:不同方位间的树干液流密度日变化特征相似并具有较强的相关性,但监测结果相差较大;不同深度的监测结果也具有类似的特征。如果忽略这种方位间和深度上的变化,整树耗水计算结果的误差最大可达104%。树干液流密度与气象因子的相关分析表明,旱柳和小叶杨的树干液流密度与大气辐射相关性最好,其次为气温。时滞分析表明,旱柳和小叶杨的树干液流密度与净辐射没有时滞,与水汽压亏缺间存在1 h的滞后。由此可见,以树干径流结果为基础在推算单株耗水量时,必须考虑方位及探头深度并合理校正。In this study, the spatiotemporal variations of sap flow densities in tree trunks of Salix matsudana and Populus simonii and their relationships with meteorological factors in the Mu Us Sandland were explored so as to a- chieve a harmonic development of water and ecology. The Granier＇s thermal dissipation probe method was used to measure the azimuthal and radial sap flow densities in tree trunks of S. matsudana and P. simonii. The results in- dicated that the daily variation of sap flow densities in the tree trunks at different directions was similar with a good correlation, but the values were quite different. The measured results at different depths were alsor similar. If the variations of such directions and depths were ignored, the maximum error of the calculated whole-tree water con- sumption could be up to 104%. The correlation analysis between the sap flow density and the metrologica] factors revealed that the correlation of sap flow densities in tree trunks of S. matsudana and P. simonii with the net radia- tion was the best, and then with the air temperature. The analyzed results showed that there was no time lag between the sap flow density and the net radiation, but there was one-hour time lag between the sap flow density and vapor pressure deficit. Thus the direction and the depth of probe must be considered when estimating the plant water consumption based on the results of sap flow density.

关 键 词：树干液流密度 旱柳(Salix matsudana) 小叶杨(Populus simonii) 时空变化 气象因子 毛乌素沙地 

分 类 号：S792.12[农业科学—林木遗传育种] S792.11[农业科学—林学]