亚热带季风区樟树的水分利用特征

夏银华; 章新平; 戴军杰; 王锐; 罗紫东; 饶志国; 肖雄; 张赐成

doi:10.13870/j.cnki.stbcxb.2022.06.025

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亚热带季风区樟树的水分利用特征

更新时间：2025-03-12

- 亚热带季风区樟树的水分利用特征
- Water Use Characteristics of
- 水土保持学报 2022年36卷第6期页码：195-205
- 作者机构：
  
  1. 湖南师范大学地理科学学院,长沙,410081
  2. 湖南师范大学地理空间大数据挖掘与应用湖南省重点实验室,长沙,410081
  3. 中国科学院亚热带农业生态研究所,长沙,410081
- 作者简介：
- 基金信息：
  
  国家自然科学基金青年科学基金项目(42101130)
- DOI：10.13870/j.cnki.stbcxb.2022.06.025
  中图分类号： S175.4
- 纸质出版：2022
- 稿件说明：
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夏银华, 章新平, 戴军杰, 等. 亚热带季风区樟树的水分利用特征[J]. 水土保持学报, 2022,36(6):195-205.

XIA Yinhua, ZHANG Xinping, DAI Junjie, et al. Water Use Characteristics of[J]. 2022, 36(6): 195-205.
夏银华, 章新平, 戴军杰, 等. 亚热带季风区樟树的水分利用特征[J]. 水土保持学报, 2022,36(6):195-205. DOI： 10.13870/j.cnki.stbcxb.2022.06.025.

XIA Yinhua, ZHANG Xinping, DAI Junjie, et al. Water Use Characteristics of[J]. 2022, 36(6): 195-205. DOI： 10.13870/j.cnki.stbcxb.2022.06.025.

摘要

基于2017—2019年樟树(Cinnamomum camphora)生长季(4—10月)的茎干水、叶片水和土壤水稳定同位素及同期环境因子数据

并结合2019—2021年樟树生长季的蒸腾速率

分析了日间樟树植物水同位素与其影响因子之间的关系

探究樟树在生长季和不同环境条件下吸水深度的变化特征

旨在加深对樟树自身水分利用特征的了解。结果表明:在晴日

樟树蒸腾速率与叶片水δ18O的值在日间高于夜间

茎干水δ18O的值在日间低于夜间。蒸腾速率与叶片水δ18O之间的时滞在8月晴日较5月晴日大

平均时滞为2.32 h。在5月晴日

叶片水δ18O和茎干水δ18O与温度、饱和水汽压差、相对湿度及蒸腾之间均呈二次函数关系;在8月晴日

叶片水δ18O与温度、饱和水汽压差、相对湿度及蒸腾之间呈二次函数关系

但茎干水δ18O与上述影响因子之间无明显的函数关系。樟树的吸水深度存在明显的季节变化特征。在生长季初期(4—5月)樟树吸水层位单一

主要利用浅层土壤水;在生长季中期(6—8月)和后期(9—10月)

樟树有2个吸水层位:在中期利用中层和深层土壤水

在后期利用浅层和深层土壤水。樟树的吸水深度和蒸腾还受到生境的影响。季节性干旱期间

随着干旱的持续

蒸腾日变化曲线的宽度逐渐变窄

蒸腾耗水量相应减小;受环境变化和自身生理特性的影响

樟树的吸水深度逐渐由浅变深再变浅。与降水前相比

降水后樟树的蒸腾作用增强

吸水深度上升

吸水土层变窄。

Abstract

In order to better understand water use characteristics of Cinnamomum camphora

based on stable isotopes of stem water

leaf water and soil water of C. camphora during growing seasons (April-October) of 2017—2019 and corresponding environmental factors in the same period

as well as transpiration rate during the growing season of 2019—2021

we analyzed the relationship between plant water isotopes and influencing factors of C. camphor plants at daily scale

explored the variation characteristics of water absorption depth of C. camphor under different environmental conditions during the growing season. The results showed that in the sunny day

the δ18O of leaf water and transpiration rate were higher in daytime than those at night

while the δ18O value of stem water was lower in daytime than that at night. The time lag between transpiration rate and leaf water δ18O was larger on the sunny day in August than that in May

and the average time lag was 2.32 h. On the sunny day in May

the δ18O of leaf water and stem water had a quadratic function with temperature

vapor pressure difference

relative humidity and transpiration. On the sunny day in August

there was a quadratic relationship between leaf water δ18O and the above factors

but there was no obvious functional relationship between stem water δ18O and the above factors. The water absorption depth of C. camphora had obvious seasonal variation characteristics. At the beginning of the growing season (April-May)

C. camphora had single water-absorbing layer

mainly used shallow soil water. It had two water-absorbing layers during the middle growing season (June-August) and the late growing season (September-October). C. camphora used middle and deep soil water in the middle of the growing season

while it used shallow and deep soil water in the late growing season. The water absorption depth and transpiration were also affected by habitat. During seasonal drought

the width of the diurnal variation curve of transpiration gradually narrowed with the duration of drought

and the water consumption of transpiration decreased correspondingly. Affected by environmental changes and its own physiological characteristics

water absorption depth of C. camphora gradually changed from shallow to deep and then shallow. However

compared with that before precipitation

transpiration of C. camphora increased after precipitation

the water absorption depth moved up

and the water absorption layer became narrow.

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