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中国沙漠 ›› 2025, Vol. 45 ›› Issue (6): 258-268.DOI: 10.7522/j.issn.1000-694X.2025.00027

• • 上一篇    

20012020年毛乌素沙地植被净初级生产力

管悦汝(), 白俊武(), 李一琼, 杨朝辉, 时浩南   

  1. 苏州科技大学 地理科学与测绘工程学院,江苏 苏州 215009
  • 收稿日期:2024-07-22 修回日期:2025-02-24 出版日期:2025-11-20 发布日期:2025-11-26
  • 通讯作者: 白俊武
  • 作者简介:管悦汝(2001—),女,江苏苏州人,硕士研究生,研究方向为生态环境遥感监测。E-mail: 113141529836@163.com
  • 基金资助:
    国家自然科学基金项目(41701477);苏州科技大学科研基金项目(XKZ2019009)

Net primary productivity of vegetation in the Mu Us Sandy Land in 2001-2020

Yueru Guan(), Junwu Bai(), Yiqiong Li, Zhaohui Yang, Haonan Shi   

  1. School of Geography Science and Geomatics Engineering,Suzhou University of Science and Technology,Suzhou 215009,Jiangsu,China
  • Received:2024-07-22 Revised:2025-02-24 Online:2025-11-20 Published:2025-11-26
  • Contact: Junwu Bai

摘要:

定量评估气候变化和人类活动对沙地生态系统碳循环的影响,对实现自然资源的可持续利用至关重要。基于MODIS时间序列数据、气象数据和土地利用数据,利用CASA模型估算了毛乌素沙地2001—2020年植被净初级生产力(NPP)。借助趋势分析、相关性分析以及残差分析等方法,探讨了毛乌素沙地植被NPP时空变化特征,定量分析气候变化和人类活动对NPP的相对贡献。结果表明:(1)2001—2020年毛乌素沙地植被NPP(以C固定量计)整体增长3 g·m⁻²·a⁻¹,空间分布呈现由西北向东南逐渐增加的趋势;(2)北部地区的植被NPP对气温变化更为敏感,而南部地区的植被NPP则对降水变化更为敏感;(3)毛乌素沙地植被NPP变化由气候变化和人类活动共同驱动,气候变化和人类活动的平均贡献分别为35.38%和64.62%。气候暖湿化促进了植被生长,人类活动虽然影响范围较小,但有30.75%区域的贡献率超过60%。生态保护措施的实施进一步加速了植被的恢复进程;(4)未来55.05%区域的植被NPP表现出反持续性,其中38.95%的区域表现出由增加变为减少的趋势,植被NPP的未来变化面临较大不确定性。

关键词: 植被净初级生产力, 毛乌素沙地, 气候变化, 人类活动

Abstract:

Quantitatively evaluating the impacts of climate change and human activities on the terrestrial ecosystem carbon cycle is crucial for sustainable natural resource utilization. Using MODIS time series data, meteorological data, and land use data, we employed the CASA model to estimate the net primary productivity (NPP) of vegetation in the Mu Us Sandy Land from 2001 to 2020. Through trend analysis, correlation analysis, and residual analysis, we examined the spatiotemporal variations in vegetation NPP and identified their driving mechanisms. We also quantitatively assessed the relative contributions of climate change and human activities to NPP. Our findings indicate that: (1) From 2001 to 2020, the overall NPP of vegetation in the Mu Us Sandy Land increased at a rate of 3 gC·m⁻²·a⁻¹, showing a spatial trend of increasing from northwest to southeast. (2) Correlation analysis revealed that vegetation NPP in the northern region is more sensitive to temperature changes, whereas in the southern region, NPP is more sensitive to precipitation changes. (3) The variations in vegetation NPP (Net Primary Productivity) in the Mu Us Sandy Land are primarily driven by climate change and human activities, with average contributions of 35.38% and 64.62%, respectively. Climate warming and humidification have promoted vegetation growth, while human activities, though limited in spatial extent, contribute over 60% in 30.75% of the area. The implementation of ecological protection measures has further accelerated vegetation recovery. (4) Looking ahead, 55.05% of the areas exhibit non-persistent trends in vegetation NPP, with 38.95% of the areas showing a shift from increase to decrease, highlighting significant uncertainty in future NPP changes.

Key words: vegetation net primary productivity, Mu Us Sandy Land, climate change, human activities

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