2022年7-8月干旱对川西高原植被长势的影响
Effect of Drought in July-August 2022 on Vegetation Growth in West Sichuan Plateau
王姝 1张亮 1朱红秀 2杨杰 1孙蕊3
作者信息
- 1. 四川省气象灾害防御技术中心,成都 610072
- 2. 四川省凉山州冕宁县气象局,冕宁 615600
- 3. 四川省气候中心,成都 610072
- 折叠
摘要
气候变化是影响植被生长的重要因素,为了解干旱对植被生长的影响,本研究基于 2022年 7-9月川西高原气候条件、植被净初级生产力(Net Primary Productivity,NPP)指数、归一化植被指数(Normalized Difference Vegetation Index,NDVI)以及牧草产草量数据,分析了 2022年 7-8月干旱对川西高原植被长势的影响,并讨论了 2000年以来气候因子与植被指数的关系.结果表明:NPP指数对干旱响应较为明显,2022年 7月有 62.50%区域的NPP指数低于历史同期,8月和 9月NPP指数持续降低,9月高达 80.83%区域的NPP指数低于历史同期;7-9月NDVI降低的区域面积分别占总面积的 13.4%、36.2%和 58.10%;牧草产量减少较为明显,与前两年相比,7-9月减产均在 5%以上;气温和降水均对各项植被指数有不同程度的影响.
Abstract
Climate change is an important factor affecting vegetation growth,in order to understand the impact of drought on vegeta-tion growth,this study analyzed the impact of drought on vegetation growth in West Sichuan Plateau based on the climatic conditions,ve-getation index of Net Primary Productivity(NPP)and Normalized Difference Vegetation Index(NDVI)and forage yield data from July to August 2022.The results showed that the NPP index responded to drought in a timely manner,the NPP index of 62.50%of area in July was lower than that in the historical period,and the NPP index in August and September continuously decreased,the NPP index of 80.83%of the area was lower in September than that in the historical period.The response of NDVI index to drought was obviously lagging be-hind,with a slight decrease in July and August,and a significant decrease in September.The NDVI index of 58.10%area was lower than that of the same period in history.The yield of forage decreased obviously.Compared with the previous two years,the grass yield from Ju-ly to September decreased by more than 5%.Temperature and precipitation had different effects on various vegetation indexes.
关键词
干旱/NDVI/NPP/产草量Key words
Drought/NDVI/NPP/Grass yield引用本文复制引用
基金项目
高原与盆地暴雨旱涝灾害四川省重点实验室科技发展基金项目(SCQXKJQN202224)
高原与盆地暴雨旱涝灾害四川省重点实验室科技发展基金项目(SCQXKJYJXZD202306)
出版年
2024
NETL
NSTL
万方数据