2000-2020 年祁连山氮磷钾时空变化及驱动因素分析

IF 2.4 3区 环境科学与生态学 Q2 ECOLOGY
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引用次数: 0

摘要

植被净初级生产力(NPP)在评估陆地生态系统的质量和功能方面起着至关重要的作用。祁连山是中国西北地区重要的生态屏障和水源涵养区。然而,祁连山绿化区(NPP增加)和褐变区(NPP减少)NPP变化的驱动因素仍不清楚。本研究利用水文气象数据和人类活动(HA)数据,分析了青龙湖湿地近二十年来NPP的时空动态和驱动因素。采用空间和趋势分析来探讨净生产力的变化。此外,还引入了重力模型来跟踪净生产力重心的迁移,并采用 Geodetector 模型来识别净生产力变化的驱动因素及其交互影响。最后,利用赫斯特指数预测变化趋势的持续性。结果显示,从 2000 年到 2020 年,QLM 的净生产力呈波动上升趋势(2.38 gC m-2 a-1),其中栽培植被和阔叶林的增幅更大。约 75.37% 的 QLM 像素显示出 NPP 增加的趋势,主要位于东南部地区。净植被生产力重心向西北移动了 18.24 千米。从空间上看,NPP 高值集中在东南部,而低值则集中在西北部。在绿化区,降水、水汽压差和蒸散作用主导了 NPP 的变化,分别占 46.1%、31.5% 和 25.0%。在褐变区,土壤水分、HA 和降水是驱动 NPP 变化的主要因素,贡献率分别为 8.4%、7.6% 和 6.6%。Geodetector 模型的结果表明,当单一因子与其他因子相互作用时,其解释力呈非线性增强。Hurst 指数表明,NPP 的变化并不持久,呈现出明显的反向持久特征,这意味着 QLM 中植被变化的不确定性。这些发现揭示了在全球变暖背景下,植被净生产力对气候变化和人类活动的非线性响应,为青龙湖生态保护和可持续发展提供了启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of Spatiotemporal Change and Driving Factors of NPP in Qilian Mountains From 2000 to 2020

Vegetation net primary productivity (NPP) plays a crucial role in assessing the quality and function of terrestrial ecosystems. The Qilian Mountains (QLM) are an important ecological barrier and water conservation area in northwest China. However, the driving factors of the NPP change in the greening (NPP increased) area and browning (NPP decreased) area of QLM remain unclear. This study analyzes the spatiotemporal dynamics and driving factors of NPP in QLM over the past two decades by utilizing hydrometeorological data and human activity (HA) data. Employing spatial and trend analyses to explore the variation of NPP. Additionally, the gravity model was introduced to track the migration of NPP's gravity center, and the Geodetector model was employed to identify the driving factors and their interactive impacts on NPP change. Finally, the Hurst index was used to predict the persistence of the changing trend. Results reveal a fluctuating increasing NPP trend (2.38 gC m−2 a−1) in QLM from 2000 to 2020, with cultivated vegetation and broad-leaved forests showing greater increases. Approximately 75.37% of QLM pixels display increased NPP trends, primarily located in the southeastern regions. The NPP gravity center shifted northwestward by 18.24 km. Spatially, high NPP values cluster concentrated in the southeast, while low values cluster concentrated in the northwest. In the greening area, precipitation, vapor pressure deficit, and evapotranspiration dominate NPP changes, contributing 46.1%, 31.5%, and 25.0%, respectively. In the browning area, soil moisture, HA, and precipitation were the primary factors driving NPP change with contributions of 8.4%, 7.6%, and 6.6%, respectively. The results of the Geodetector model indicated that the explanatory power of a single factor was nonlinearly enhanced when it interacted with other factors. The Hurst index suggests that the NPP change was not persistent, showing clear reverse persistent characteristics, which implies uncertainty of the vegetation change in QLM. These findings reveal nonlinear responses of NPP to climate change and human activities in the context of global warming, providing insights for QLM's ecological protection and sustainable development.

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来源期刊
Rangeland Ecology & Management
Rangeland Ecology & Management 农林科学-环境科学
CiteScore
4.60
自引率
13.00%
发文量
87
审稿时长
12-24 weeks
期刊介绍: Rangeland Ecology & Management publishes all topics-including ecology, management, socioeconomic and policy-pertaining to global rangelands. The journal''s mission is to inform academics, ecosystem managers and policy makers of science-based information to promote sound rangeland stewardship. Author submissions are published in five manuscript categories: original research papers, high-profile forum topics, concept syntheses, as well as research and technical notes. Rangelands represent approximately 50% of the Earth''s land area and provision multiple ecosystem services for large human populations. This expansive and diverse land area functions as coupled human-ecological systems. Knowledge of both social and biophysical system components and their interactions represent the foundation for informed rangeland stewardship. Rangeland Ecology & Management uniquely integrates information from multiple system components to address current and pending challenges confronting global rangelands.
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