植物水分利用效率动态及其承载力估算——以毛乌素沙地典型植被为例

高琴; 党晓宏; 蒙仲举; 刘阳

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (9) : 5129-5142.

环境生态

植物水分利用效率动态及其承载力估算——以毛乌素沙地典型植被为例

高琴¹, 党晓宏^1,2, 蒙仲举¹, 刘阳³

作者信息 +

Dynamics of plant water use efficiency and estimation of its carrying capacity: Take the typical Mu Us Sandy Land vegetation as an example

GAO Qin¹, DANG Xiao-hong^1,2, MENG Zhong-ju¹, LIU Yang³

Author information +

文章历史 +

摘要

以毛乌素沙地典型植被类型为研究对象,基于Biome-BGC生态过程模型,模拟分析了过去24a的碳水通量、水分利用效率(WUE)及其驱动因子的时空动态,并估算了不同林分的土壤水分植被承载力.结果表明:碳水通量逐年递增,GPP和ET年均增长速率分别为6.42g C/m²和5.45kg H₂O/m²,WUE以0.006g C/kg H₂O递减,显示出碳增效与水耗不平衡的趋势,种间竞争显著影响WUE的动态稳定性;灌木纯林在碳水调节关系中表现出更强的适应性,CO₂浓度增加是导致WUE下降的主要驱动因子,并通过温度(间接通径系数0.435)和NDVI(间接通径系数0.808)产生显著间接影响,适度调控林分结构及地表植被覆盖可有效提升区域WUE;土壤水分植被承载力结果显示,乔木林、灌木林及灌灌混交林当前栽植密度尚有提升空间,分别可上调15.07%、3.78%、16.72%.研究有助于厘清干旱半干旱区不同植被类型的水分利用机制,明确植被恢复工程在水资源约束下的生态限度,为区域“以水定植”政策制定及沙地生态系统可持续管理提供理论支持和决策依据.

Abstract

Based on the Biome-BGC ecological process model, the spatial and temporal dynamics of carbon and water flux, water use efficiency (WUE), and its driving factors in the past 24 years were simulated and analyzed, and the soil moisture vegetation carrying capacity of different stands was estimated. The carbon and water fluxes increased year by year, and the average annual growth rates of GPP and ET were 6.42g C/m² and 5.45kg H₂O/m², respectively. WUE decreased by 0.006g C/kg H₂O, showing a trend of carbon efficiency and water consumption imbalance. Interspecific competition significantly affected the dynamic stability of WUE. The shrub pure forest showed stronger adaptability in the carbon and water regulation relationship. The increase of CO₂ concentration was the main driving factor leading to the decrease of WUE, and had a significant indirect effect through temperature (indirect path coefficient 0.435) and NDVI (indirect path coefficient 0.808). Moderate regulation of stand structure and surface vegetation coverage can effectively improve regional WUE. The results of soil moisture vegetation carrying capacity showed that there was still room for improvement in the current planting density of arbor forest, shrub forest and shrub-shrub mixed forest, which could be increased by 15.07%, 3.78% and 16.72%, respectively. The study is helpful to clarify the water use mechanism of different vegetation types in arid and semi-arid areas, define the ecological limits of vegetation restoration projects under the constraints of water resources, and provide theoretical support and decision-making basis for regional 'planting by water' policy formulation and sustainable management of sandy ecosystem.

导出引用

高琴, 党晓宏, 蒙仲举, 刘阳. 植物水分利用效率动态及其承载力估算——以毛乌素沙地典型植被为例[J]. 中国环境科学. 2025, 45(9): 5129-5142

GAO Qin, DANG Xiao-hong, MENG Zhong-ju, LIU Yang. Dynamics of plant water use efficiency and estimation of its carrying capacity: Take the typical Mu Us Sandy Land vegetation as an example[J]. China Environmental Science. 2025, 45(9): 5129-5142

中图分类号： X173

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