科尔沁沙地杨树苗木生长过程中蒸腾耗水规律研究

摘要/Abstract

摘要： 应用热平衡茎流测量技术,Li-6400光合作用测量系统和自动气象站,对科尔沁沙地杨树苗木生长过程中的蒸腾耗水规律及其与环境因子的关系进行研究。结果表明,杨树液流日变化曲线根据天气条件的不同呈现为多峰或宽峰状态,液流启动时间为04:30,并在21:00达到最低值。液流通量密度变化趋势与环境因子变化趋势相吻合,液流的变化是受各环境因子综合作用的结果。光合有效辐射(Q)和空气水蒸汽压亏缺(D)是杨树苗木蒸腾耗水的主要驱动因子,它们对于液流变化的影响快速而直接。杨树属于高耗水低水分利用型植物,适合在水分条件较好的立地条件下进行栽植。

关键词: 热平衡技术, 杨树苗木, 液流, 环境因子, 科尔沁沙地

Abstract: Based on the Dynamax Sap Flow Measuring System, Li-6400 Portable Photosynthesis System and Automatic Weather Station System, the sap flow, leaf transpiration of poplar seedlings in Horqin Sand Land and its relation with environmental factors were studied. The results showed that the diurnal variation of sap flow density of the poplar seedlings presented multi-peaks curve or broad-peak curve depending on the weather conditions. The sap flow started at 04:30 and stopped at 21:00. There are close relation between sap flow density of poplar seedlings and the ambient environmental factors, and the variation of sap flow is the result of comprehensive effect of multiple meteorological factors. The diurnal variation of stem sap flow of poplar seedling is controlled mainly by photosynthetic active radiation (Q) and vapor pressure deficit (D). Poplar seedlings, with high water consumption but low water use efficiency, are more suitable to grow in sufficient soil moisture conditions.

Key words: heat balance method, poplar seedling, sap flow, environmental factors, Horqin Sand Land

中图分类号:

Q945.17

岳广阳;赵哈林;张铜会;牛丽;. 科尔沁沙地杨树苗木生长过程中蒸腾耗水规律研究[J]. 中国沙漠, 2009, 29(4): 674-679.

YUE Guang-yang;ZHAO Ha-lin;ZHANG Tong-hui;NIU Li;. Sap Flow Characteristics of Growing Poplar Seedlings in Horqin Sand Land[J]. JOURNAL OF DESERT RESEARCH, 2009, 29(4): 674-679.

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