基于多指数遥感的草地干旱影响评价

IF 2.4 3区 环境科学与生态学 Q2 ECOLOGY
Zhewen Zhao , Rana Waqar Aslam , Iram Naz , Zohaib Afzal , Anum Liaqut , Muhammad Azeem Liaquat , Hela Elmannai , Rana Muhammad Zulqarnain
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引用次数: 0

摘要

利用多种遥感指标和土地利用/土地覆被分析,评价了2024年干旱对草地生态系统的影响。该研究综合了植被相关指数(NDVI、VCI、VHI、ESI)、水相关指数(NDWI、SMI、SPI、TCI)和干旱相关指数(PDSI、DSI、NDDI、LST),评估了该地区有限牧场资源的干旱严重程度。土地利用/土地覆盖分类显示,放牧地仅占总面积的1319.3 km²(1%),主要分布在干旱较为严重的西部和西南部地区。牧地植被健康状况较差,NDVI值较低(0.12-0.25),植被条件低于正常(VCI 25-45),特别是在VHI值低于30的西部地区。水分相关指数表现出严重的水分亏缺,NDWI为负(-0.35 ~ -0.45),土壤湿度低(SMI 0.07 ~ 0.11)。综合干旱指数显示,PDSI值介于-40 ~ -80之间,DSI值介于-25 ~ -40之间。相关分析揭示了指数之间的一般弱关系(系数在-0.25和0.25之间),支持多指数方法的价值。对比分析表明,放牧区干旱胁迫程度高于灌溉区,但极端条件低于裸地,NDVI(0.18)、NDWI(-0.39)和PDSI(-45.2)处于中等水平。这些发现为制定干旱地区有针对性的干旱管理政策和适应性牧地保护战略提供了重要信息。多指标方法为草地生态系统干旱综合评价提供了一个框架。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessment of Drought Impact on Rangelands Using Multi-Index Remote Sensing Approach
This study evaluates drought impacts on rangeland ecosystems in during 2024 using multiple remote sensing indices and land use/land cover analysis. The research integrates vegetation-related indices (NDVI, VCI, VHI, ESI), water-related indices (NDWI, SMI, SPI, TCI), and drought-specific indices (PDSI, DSI, NDDI, LST) to assess drought severity across the region's limited rangeland resources. Land Use/Land Cover classification reveals that rangelands occupy only 1,319.3 km² (1%) of the total area, predominantly in western and southwestern regions where drought conditions are more severe. Rangelands exhibit poor vegetation health with low NDVI values (0.12–0.25) and below-normal vegetation conditions (VCI 25–45), particularly in western areas where VHI values fall below 30. Water-related indices show severe moisture deficits, with negative NDWI values (–0.35 to –0.45) and low soil moisture (SMI 0.07–0.11). Comprehensive drought indices confirm moderate to severe drought conditions, with PDSI values ranging from –40 to –80 and DSI values between –25 and –40. Correlation analysis reveals generally weak relationships among indices (coefficients between –0.25 and 0.25), supporting the value of a multi-index approach. Comparative analysis shows that rangelands experience greater drought stress than irrigated croplands but less extreme conditions than bare ground areas, with intermediate NDVI (0.18), NDWI (–0.39), and PDSI (–45.2) values. These findings provide critical information for developing targeted drought management policies and adaptive rangeland conservation strategies in arid regions. The multi-index approach provides a framework for comprehensive drought assessment in rangeland ecosystems.
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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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