Dynamics of Soil Moisture and Sap Flow of Itea Yunnanensis in Karst Region

YANG Rui; YU Lifei; DAI Quanhou

doi:10.13961/j.cnki.stbctb.2015.02.017

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Dynamics of Soil Moisture and Sap Flow of Itea Yunnanensis in Karst Region

- Dynamics of Soil Moisture and Sap Flow of Itea Yunnanensis in Karst Region
- Bulletin of Soiland Water Conservation Vol. 35, Issue 2, Pages: 89-93(2015)
- 作者机构：
  
  1. 贵州大学林学院,贵州,贵阳,550025
  2. 贵州大学生命科学学院,贵州,贵阳,550025
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2015.02.017
  CLC：
- Published：2015
- 稿件说明：
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YANG Rui, YU Lifei, DAI Quanhou. Dynamics of Soil Moisture and Sap Flow of Itea Yunnanensis in Karst Region[J]. Bulletin of Soiland Water Conservation, 2015, 35(2): 89-93.
DOI：

YANG Rui, YU Lifei, DAI Quanhou. Dynamics of Soil Moisture and Sap Flow of Itea Yunnanensis in Karst Region[J]. Bulletin of Soiland Water Conservation, 2015, 35(2): 89-93. DOI： 10.13961/j.cnki.stbctb.2015.02.017.

摘要

[目的] 分析喀斯特区树干液流速率与土壤水分之间关系

揭示云南鼠刺的水分动态及对生境的适应机理

为喀斯特区生态环境建设提供理论依据。[方法] 2009年7月26日至8月1日期间

利用热扩散式液流探针对喀斯特区的土面和石沟两种不同生境中云南鼠刺的树干液流进行连续测定

同时测定土壤水分含量的变化。[结果] 两种不同生境中树干液流日变化呈现出不规则峰形曲线

每天液流速率的最大值均出现在白天

最小值均出现在夜间;同一深度土壤含水量随着时间的推移均逐渐降低

但降低速率不同

其变化与土壤深度的关系不明显;云南鼠刺树干液流速率与土壤含水量存在着不显著的正相关关系。[结论] 云南鼠刺在喀斯特区的土面和石沟两种生境中的树干液流速率不同

但规律基本一致

树干液流速率与土壤含水量的相关关系不显著。

Abstract

[Objective] This paper aimed to explore the dynamic change of water use and the adaptation mechanism of Itea yunnanensis to microhabitat

to provide the theoretical basis for ecological environment reconstruction in karst region by analyzing the relationship between sap flow velocity and soil water content.[Methods] Thermal dissipation probe(TDP) was used to measure the sap flow dynamics of Itea yunnanensis at two microhabitats of non-stony soil surface and stony gully in karst region from July 26 to August 1

2009. At the same time

soil water content was measured.[Results] Diurnal variation of sap flow displayed an irregular peaked curve

the peak velocity of sap flow occurred in daylight

the peak base of sap flow velocity was observed at night. The soil water content in the same depth gradually decreased with rate along time. The sap flow velocity of Itea yunnanensis and the soil water content had insignificantly positive correlation.[Conclusion] Though there were different sap flow velocity of Itea yunnanensis at the two microhabitats of non-stony soil surface and stony gully in karst region

it showed similar timeline responses under the two habitats. There was no obvious relationship between sap flow velocity and soil water content.

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