Response of Water Use Strategies of Vegetation Community to Drought Stress in the Loess Hilly Region

LUO Lijiao; GAO Xiaodong; ZHAO Lianhao; AN Qingrong; MA Nanfang; ZHAO Xining

doi:10.13870/j.cnki.stbcxb.2023.01.036

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Response of Water Use Strategies of Vegetation Community to Drought Stress in the Loess Hilly Region

更新时间：2025-03-12

- Response of Water Use Strategies of Vegetation Community to Drought Stress in the Loess Hilly Region
- Vol. 37, Issue 1, Pages: 280-288(2023)
- 作者机构：
  
  1. 中国科学院水利部水土保持研究所, 陕西杨凌,712100
  2. 中国科学院大学,北京,100049
  3. 西北农林科技大学水土保持研究所, 陕西杨凌,712100
  4. 西北农林科技大学水利与建筑工程学院, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2023.01.036
  CLC： S715.3
- Published：2023
- 稿件说明：
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LUO Lijiao, GAO Xiaodong, ZHAO Lianhao, et al. Response of Water Use Strategies of Vegetation Community to Drought Stress in the Loess Hilly Region[J]. 2023, 37(1): 280-288.
DOI：

LUO Lijiao, GAO Xiaodong, ZHAO Lianhao, et al. Response of Water Use Strategies of Vegetation Community to Drought Stress in the Loess Hilly Region[J]. 2023, 37(1): 280-288. DOI： 10.13870/j.cnki.stbcxb.2023.01.036.

摘要

为探讨气候变化下灌草群落中主要植物水分来源差异及动态变化。以黄土高原典型自然恢复植物(油蒿、苜蓿与藜)为研究对象

通过减少自然降水的15%(中度干旱)与30%(极端干旱)来控制干旱程度

研究植物水分利用来源与生长对干旱胁迫的响应特征。将植被群落潜在水源划分为浅层(0—20 cm)、中层(20—60 cm)与深层(60—120 cm)土壤水

采用稳定水同位素技术与MixSIAR模型定量分析不同干旱胁迫程度(减雨30%、减雨15%与对照)下植被根系水分吸收特征。结果表明:(1)土壤水与植物水中稳定氢氧同位素值(δD和δ18O)均位于当地大气降水线的右下方

说明土壤水同位素受蒸发影响发生富集;(2)3种典型植物在遭遇干旱胁迫时

其水分利用来源均可灵活转换于不同土层之间

呈浅层土壤水分利用比例减少

中层与深层土壤水分利用比例增加的规律

且随干旱胁迫程度增大愈加明显;(3)不同植被响应干旱胁迫的水分利用策略不同

平地

减雨30%、减雨15%及CK处理下油蒿均主要利用浅层土壤水(贡献率分别为48.2%

52.7%

57.6%)

而藜分别主要利用来自中层(43.5%)、浅层(49.6%)与浅层土壤水(53.6%);坡地

减雨30%、减雨15%及CK处理下油蒿均主要利用浅层土壤水(贡献率分别为42.5%

44.5%

58.1%)

而苜蓿分别主要利用来自中层(40.9%)、中层(46.7%)与浅层土壤水(53.9%)。这表明半干旱黄土丘陵区植被群落主要物种可通过可塑性转换水分来源以应对干旱胁迫

并在空间上分割群落水源以有效缓解对水分资源的竞争压力

从而通过在水分资源利用上的生态位分化促进物种间的共存。

Abstract

To explore the differences in water sources and dynamic changes of major plants in shrub communities under climate change

the response characteristics of water use sources and growth of typical natural recovery plants (Artemisia ordosica

Medicago Sativa and Chenopodium album) to drought stress in the Loess Plateau were studied. And the droughts were controlled by reducing natural precipitation by 15% (moderate drought) and 30% (extreme drought). The potential water sources of vegetation communities were divided into shallow (0—20 cm)

middle (20—60 cm) and deep (60—120 cm) soil water. The stable water isotope technique and MixSIAR model were used to quantitatively analyze the water absorption characteristics of vegetation roots under different drought stress levels (30%

15% and the control). The results showed that: (1) The stable hydrogen and oxygen isotope values (δD and δ18O) of soil water and plant water were both located at the lower right of the local atmospheric precipitation line

which indicated that the isotope of soil water was enriched by evaporation. (2) Water sources of three typical plants could be flexibly converted to different soil layers under drought stress

specifically

the proportion of shallow soil moisture utilization decreased

while the proportion of middle and deep soil moisture utilization increased

which became more obvious with the increase of drought stress levels. (3) Different vegetation responsed to drought stress through different water use strategy

Artemisia ordosica mainly used shallow soil water (contribution rates were 48.2%

52.7% and 57.6%

respectively) under flat land

rainfall reduction of 30%

15% and CK treatments

while Chenopodium album mainly used middle (43.5%)

shallow (49.6%) and shallow soil water (53.6%)

respectively. In slope land

rainfall reduction of 30%

15% and CK treatment

Artemisia ordosica mainly used shallow soil water (contribution rates were 42.5%

44.5% and 58.1%

respectively)

while Medicago Sativa mainly used the middle (40.9%)

middle (46.7%) and shallow (53.9%) soil water. This indicated that the main species of vegetation community in semi-arid loess hilly region could respond to drought stress by converting water sources through plasticity. And the community water sources were divided in space to effectively reduce the competitive pressure on water resources

which would promote the coexistence of species through niche differentiation in water resources utilization.

关键词

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