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CAS Workshop on Ecosystem Succession Theory and Practice of Ecological Restoration 热带桉树（Eucalyptus
urophylla
S.T. Blake）人工林树液流通量及蒸散作用研究 周国逸1 尹光彩1 Jim Morris2 徐大平3 陈少雄4 褚国伟1 张宁南3 （1中国科学院华南植物研究所，广州
510650；2Centre for Forest Tree Technology, P.O. Box 137, Heidelberg,
Victoria 3084, Australia; 3中国科学院热带林业研究所，广州
510520；4国家林业局桉树研究开发中心，广东湛江
524022） 摘要：本文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、环境因子和林分特性相关指标1a
多
（1999年9月12日至2000年9月24日）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）与气温的关系都有深厚的影响；（2）河头的日树液流通量密度及一天中的SFD最大值均比纪家约大一倍；（3）林冠层的VPD（空气饱和差）对SFD有显著影响；（4）纪家和河头的林分蒸腾量占总蒸散量百分比都在50％左右；（5）某一树种单位叶面积水平上的SFD和其边材所能承受的最大SFD是评价该树种水分利用的两个重要指标。
关键词：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 Measured
sap flow and estimated evapotranspiration of tropical Eucalyptus
urophylla plantations in south-eastern China Zhou
Guoyi1 Yin
Guangcai1 Jim
Morris Xu Daping3 Chen
Shaoxiong4 Chu
Guowei1 Zhang
Ningnan3 (1South
China Institute of Botany, CAS, 510650, Guangzhou, China; 2Center
for Forest Tree Technology, P.O. Box 137, Heidelberg, Victoria 3084,
Australia; 3Research Institute of Tropical Forestry, CAF,
Guangzhou, 510520, China; 4China Eucalyptus Research and
Development Center, CAF, Zhanjiang 524022, China)
Abstract:
From September 12, 1999 to September 24, 2000, we measured
sap flow of eucalyptus (Eucalyptus urophylla S.T. Blake) plantations
with heat pulse technique and its related environmental factors at
Hetou and Jijia site, Leizhou Peninsula, Guangdong Province. Based
on sap flow measurements and evapotanspiration information estimated
from a theoretical equation, we drew the following conclusions: (1)
Sap flow and the correlation between xylem sap flux density (SFD)
and air temperature were influenced greatly by soil properties and
the related soil water potential; (2) The maximum diurnal SFD at
Hetou site, being characterized by coarse textured soils formed on
Quaternary sediments, was almost two times of that at Jijia site,
which is located on basalt derived clay rich soils; (3) SFD was also
highly correlated with bulk
air vapor pressure deficit (VPD) near the canopy layer; (4)The
plantation transpiration was almost 50% of evapotranspiration at
both sites; (5) Averaged SFD per unit leaf area (ASPULA) and maximum
SFD were good indexes to evaluate water consumption of a species. Key
words: Eucalyptus urophylla plantation; water consumption; sap flux
density (SFD); vapor pressure deficit (VPD); transpiration;
evapotranspiration
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