Analysis of the spatiotemporal evolution characteristics and drought trend of key meteorological factors in the Nagqu grassland
那曲草原关键气象要素的时空演变特征及干旱化趋势分析

摘要

本研究基于2015-2024年月平均数据，结合那草原地中东部高寒草甸类、西部高寒草原类、偏北部高寒荒漠草原类或高寒荒漠类的资源分布情况，根据西藏地方标准DB54/T 0538-2025《气象干旱指数等级划分》，采用降水距平百分率pa算法计算那曲市月气象干旱指数。结果表明：那曲草原在近年来呈现出一定的干旱化趋势，这种干旱化趋势将会对生态系统、农牧业生产等产生负面影响。本研究在有效揭示那曲草原关键气象要素时空演变规律的同时，也可以为那曲草原的生态保护工作、草畜平衡调控工作等高质量开展，提供科学依据和决策支持。

Abstract

This study is based on monthly average data from 2015 to 2024, combined with the resource distribution of alpine meadows in the eastern part of the grassland, alpine grasslands in the western part, and northern high-altitude desert grasslands or high-altitude deserts in that area. According to the local standard of Xizang Province DB54/T 0538 - 2025 “Classification of Meteorological Drought Index Levels”, the precipitation anomaly percentage pa algorithm is used to calculate the monthly meteorological drought index of Nanchug City. The results show that the grassland of Nanchug has shown a certain trend of aridification in recent years, and this aridification trend will have negative impacts on the ecosystem and agricultural production. This study not only effectively reveals the spatiotemporal evolution patterns of key meteorological elements in the grassland of Nanchug, but also can provide scientific basis and decision support for the ecological protection work and grass-cattle balance regulation work of the grassland of Nanchug to be carried out in a high-quality manner.