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应用生态学报 ›› 2025, Vol. 36 ›› Issue (6): 1731-1739.doi: 10.13287/j.1001-9332.202506.007

• 研究论文 • 上一篇    下一篇

毛乌素沙地植被水分利用效率时空变化及其影响因素

王志鹏1, 石长春2,3, 马雅莉2,3, 张艳2,3, 玉苏普喀迪尔·孜米尼1, 寇伟良1, 温仲明1*, 刘洋洋1   

  1. 1西北农林科技大学草业与草原学院, 陕西杨凌 712100;
    2陕西省林业科学院, 西安 710082;
    3陕西榆林毛乌素沙地荒漠生态系统国家定位观测研究站, 陕西榆林 719000
  • 收稿日期:2025-02-03 接受日期:2025-04-22 出版日期:2025-06-18 发布日期:2025-12-18
  • 通讯作者: *E-mail: zmwen@ms.iswc.ac.cn
  • 作者简介:王志鹏, 男, 1994年生, 硕士研究生。主要从事草地动态遥感监测及其驱动机制研究。E-mail: wangzhipeng123@nwafu.edu.cn
  • 基金资助:
    陕西林业科技创新重点专项(SXLK2023-02-14,SXLK2022-02-7)和国家自然科学基金青年基金项目(41977077,42107512)

Spatiotemporal changes of vegetation water use efficiency and its influencing factors in Mu Us Sandy Land, China

WANG Zhipeng1, SHI Changchun2,3, MA Yali2,3, ZHANG Yan2,3, Yusupukadier ZIMINI1, KOU Wei-liang1, WEN Zhongming1*, LIU Yangyang1   

  1. 1College of Grassland Agriculture, Northwest A&F University, Yangling 712100, Shaanxi, China;
    2Shaanxi Academy of Forestry, Xi’an 710082, China;
    3State Long-term Observation and Research Station for Mu Us Sandland Ecosystem in Yulin of Shaanxi, Yulin 719000, Shaanxi, China
  • Received:2025-02-03 Accepted:2025-04-22 Online:2025-06-18 Published:2025-12-18

摘要: 本文基于植被总初级生产力(GPP)和蒸散发(ET),采用线性回归分析、Hurst指数预测、多元线性回归和结构方程模型方法,对毛乌素沙地植被水分利用效率(WUE)的时空动态进行分析,探究水热条件对植被水利用效率的影响。结果表明: 2001—2020年,毛乌素沙地植被GPP、ET年均值分别为264.82 g C·m-2和259.12 mm,呈逐渐上升趋势,波动幅度较大;而植被WUE值在0.170~0.342 g C·mm-1·m-2,年均值为0.279 g C·mm-1·m-2,呈稳定降低趋势。植被WUE具有明显的空间异质性,呈北部低、南部高的变化趋势。草地、耕地和林地的WUE与温度、太阳辐射呈正相关,与降水、土壤水分呈负相关。气候因素对毛乌素沙地各区域的影响程度不同,温度为东部地区的主导因素,土壤水分为中部地区的主导因素;降水、温度、太阳辐射和土壤水分通过影响ET变化进而影响植被WUE的变化。

关键词: 毛乌素沙地, 总初级生产力, 水分利用效率, 气候变化

Abstract: Based on the gross primary productivity (GPP) and evapotranspiration (ET) of vegetation, we analyzed the spatiotemporal dynamics of vegetation water use efficiency (WUE) in Mu Us Sandy Land by using linear regression analysis, Hurst index prediction, multiple linear regression, and structural equation modeling, aiming to understand the influence of water and heat conditions on vegetation WUE. The results showed that the average annual values of vegetation GPP and ET in Mu Us Sandy Land from 2001 to 2020 were 264.82 g C·m-2 and 259.12 mm, respectively, showing a gradually increasing trend with a large fluctuation range. The WUE of vegetation ranged from 0.170 to 0.342 g C·mm-1·m-2, with an annual average of 0.279 g C·mm-1·m-2, showing a stable decreasing trend. The vegetation WUE exhibited obvious spatial heterogeneity, presenting a changing trend of being lower in the north and higher in the south. The WUE of grassland, cropland, and forest was positively correlated with temperature and solar radiation, and negatively correlated with precipitation and soil moisture. The influence of climatic factors varied across regions of the Mu Us Sandy Land, with temperature being the dominant factor in the eastern region and soil moisture being the dominant factor in the central region. Precipitation, temperature, solar radiation, and soil moisture affected vegetation WUE by altering ET.

Key words: Mu Us Sandy Land, gross primary productivity, water use efficiency, climate change