Water sources and water use efficiency of plants at different slopes in karst mountainous areas

Wu Hongyu; Jiang Yongjun; Wu Ze; Lü Yuxiang; Luo Shue; Zhang Xianming; Li Mengni; Zhao Chunfeng; Lü Tongru; Mao Yang; Qiu Ju

doi:10.13961/j.cnki.stbctb.2025.04.040

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Water sources and water use efficiency of plants at different slopes in karst mountainous areas

Experimental Researches

- Water sources and water use efficiency of plants at different slopes in karst mountainous areas
- Bulletin of Soil and Water Conservation Vol. 45, Issue 4, Pages: 19-28(2025)
- 作者机构：
  
  1.西南大学地理科学学院，重庆 400700
  2.重庆市地质矿产勘察开发局南江水文地质工程地质队，重庆 400700
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2025.04.040
  CLC： S157;X173 S792.39
- CSTR：32312.14.stbctb.2025.04.040.
- Received：08 February 2025，
  
  Revised：2025-05-23，
  
  Published：20 August 2025
- 稿件说明：
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吴虹余, 蒋勇军, 吴泽，等.岩溶山地不同坡位植物水分来源和水分利用效率[J].水土保持通报,2025,45(4):19-28.

Wu Hongyu, Jiang Yongjun, Wu Ze, et al. Water sources and water use efficiency of plants at different slopes in karst mountainous areas [J]. Bulletin of Soil and Water Conservation,2025,45(4):19-28.
吴虹余, 蒋勇军, 吴泽，等.岩溶山地不同坡位植物水分来源和水分利用效率[J].水土保持通报,2025,45(4):19-28. DOI： 10.13961/j.cnki.stbctb.2025.04.040. CSTR： 32312.14.stbctb.2025.04.040..

Wu Hongyu, Jiang Yongjun, Wu Ze, et al. Water sources and water use efficiency of plants at different slopes in karst mountainous areas [J]. Bulletin of Soil and Water Conservation,2025,45(4):19-28. DOI： 10.13961/j.cnki.stbctb.2025.04.040. CSTR： 32312.14.stbctb.2025.04.040..

摘要

目的

研究岩溶坡地生境中不同坡位典型木本植物的水分利用效率，为岩溶坡地制定合理的水土保持和生态修复措施提供指导。

方法

利用气象数据、土壤质量含水率、稳定同位素（δ

H，δ

O，δ

C）数据，研究了重庆明月山岩溶槽谷3个不同坡位样地的典型木本植物的水分来源和水分利用效率。

结果

①雨季土壤含水率高于旱季；坡上的平均土壤含水率较坡中低5.07%~28.41%，较坡下低16.36%~30.49%。 ②表层岩溶带水是不同坡位上木本植物的重要水源，雨季坡上、坡中和坡下的木本植物对其利用比例分别为34.65%，25.58%和20.82%，旱季分别为54.44%，53.60%和43.47%。雨季，坡中和坡下植物对20—40 cm土层土壤水分的利用比例高于坡上；而旱季，坡下植物对20—40 cm土层土壤水分的利用比例高于坡上。 ③乔木和灌木的δ

C值和内在水分利用效率（WUE

）在雨季均低于旱季。在不同坡位中，乔木的WU

值均高于灌木，乔木和灌木WUE

的均值表现为：坡上

坡中

坡下。

结论

岩溶槽谷的土壤含水量从坡上到坡下递增。坡上植物面对水分胁迫时，更多利用表层岩溶带水，且水分利用效率更高。

Abstract

Objective

The water use efficiency of typical woody plants at different slope positions in karst slope habitats were analyzed in order to provide guidance for formulating effective soil and water conservation and ecological restoration measures for karst slopes.

Methods

Using meteorological data， soil mass moisture content， and stable isotope （δ

H， δ

O， δ

C） data， the water sources and water use efficiency of typical woody plants in three different slope plots in the karst trough valley of Mingyue Mountain， Chongqing were studied.

Results

① Soil moisture content was higher during the rainy season than during the dry season. In terms of slope position， the average soil moisture content on the upper slope was lower than that on the middle slope， with a difference ranging from 5.07% to 28.41%， and approximately 16.36% to 30.49% lower than that on the lower slope. ② Water from the surface karst zone serves as a critical water source for woody plants at different slope locations. The utilization rates were 34.65%， 25.58% and 20.82% for the upper， middle and lower slopes respectively， during the rainy season， and increased to 54.44%， 53.60% and 43.47% respectively， during the dry season. During the rainy season， the utilization ratio of soil moisture by plants in the 20—40 cm soil layer on the middle and lower slopes was higher than that on the upper slopes. During the dry season， the proportion of soil moisture utilized by plants in the 20—40 cm soil layer on the lower slopes was higher than that on the upper slopes.③ The δ

C values and intrinsic water use efficiency （WUE

） of trees and shrubs were lower

during the rainy season than during the dry season. Across different slope positions， the WUE

of trees was higher than that of shrubs， with the mean WUE

following the order： upper slope

middle slope

lower slope.

Conclusion

Owing to differences in slope position， the soil moisture content in the karst trough valley increases from the top to the bottom of the slope. When plants on slopes are exposed to water stress， they make greater use of the water in the surface karst zone and exhibit higher water use efficiency.

关键词

Keywords

references

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