首页|华南桉树人工林树液流通量及蒸散作用

华南桉树人工林树液流通量及蒸散作用

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
通过对广东省湛江市雷州半岛桉树(Eucalyptus urophylla S.T.Blake)人工林的树液流通量、环境因子、土壤蒸发、林冠截留和林分特性相关指标一年多的连续观测,以及通过一个理论公式对日蒸散量的计算,得出了如下结论:(1)土壤特性及由此决定的土壤水势对树液流通量,以及树液流通量密度(SFD)与气温的关系有一定影响;(2)林冠层的VPD(空气饱和差)对SFD有显著影响;(3)由测定和计算得来的蒸散量在河头和纪家分别有5.26%和6.14%的偏差,可以认为这两种方法有较好的一致性;(4)河头和纪家的林分蒸腾量占总蒸散量百分比分别为62.2%和51.3%;(5)树种单位叶面积水平上的SFD是评价该树种水分利用的重要指标.
Measured Sap Flow and Estimated Evapotranspiration of Tropical Eucalyptus urophylla Plantations in South China
During the period of September 12, 1999 to September 24, 2000, we measured sap flow of eucalyptus (Eucalyptus urophylla S.T. Blake) plantations using heat pulse technique, and the relevant environmental vaiables, such as soil evaporation and canopy interception, etc, at Hetou and Jijia sites,Leizhou Peninsula, Guangdong Province. Based on the measurements of sap flow and estimates of evapotranspiration, the following can be concluded: (1) the maximum of diurnal xylem sap flux density (SFD) at Hetou, where covered with coarse-textured soils formed on Quaternary sediments, was almost twice of that at Jijia, where located on clay-rich soils derived from basalt; (2) SFD was highly correlated to water vapor pressure deficit (VPD) of ambient air near the canopy layer; (3) the correlation between SFD and air temperature also depends on soil properties and soil water potential; (4) the relative differences between measured and modeled evapotranspiration were small, being 5.26% at Hetou and 6.14% at Jijia; (5) the plantation transpiration accounted for 62.2% and 51.3% of the evapotranspiration at Hetou and Jijia,respectively; and (6) the averaged SFD per unit leaf area (ASPULA) was a good index to estimate the amount of water consumption of tree species.

Eucalyptus urophyllaplantationwater consumptionsap flux density (SFD)vapor pressure deficit (VPD)transpirationevapotranspiration

周国逸、尹光彩、Jim MORRIS、白嘉雨、陈少雄、褚国伟、张宁南

展开 >

中国科学院华南植物研究所,广州,510650

Centre for Forest Tree Technology P.O.Box 137,Heidelberg,Victoria 3084,Australia

中国科学院热带林业研究所,广州,510520

国家林业局桉树研究开发中心,湛江,524022

展开 >

桉树人工林 水分消耗 树液流通量密度(SFD) 空气饱和差(VPD) 蒸腾作用 蒸散作用

中国科学院知识创新工程项目国家重点基础研究发展计划(973计划)中国科学院海外杰出青年基金广东省自然科学基金

KSCX2-SW-1202002CB111503010567

2004

植物学报(英文版)
中国植物学会

植物学报(英文版)

CSCD
影响因子：0.921
ISSN：1672-9072
年,卷(期)：2004.46(2)
  • 16
  • 2