基于遥感植被指数的青海高原植被覆盖对气候变化的响应关系分析

Response of Vegetation Cover to Climate Change in Qinghai Plateau Based on Remote Sensing Vegetation Index

植被覆盖度是影响水土流失的重要环境因子,青海高原地区植被覆盖在人类活动、气候变化、生态环境保护工程建设等因素的影响下发生了显著的变化。为明确高原地区植被覆盖变化的气候驱动机制,利用1982—2015年青海高原地区的气温、降水量、风速、日照等气候因子和遥感植被指数数据,分析了研究区内植被覆盖对气候变化的响应关系。结果表明,研究区植被覆盖变化与平均气温和平均风速在0.01置信水平下显著相关,且与平均气温是正相关关系,与平均风速为负相关关系;气温升高、风速降低、降雨量增加是青海高原地区植被覆盖改善的主要气候驱动因素。

Vegetation coverage is an important environmental factor for soil erosion.The vegetation coverage of Qinghai Plateau has been changed significantly under the influence of human activities,climate change and the construction of ecological environmental protection projects.In order to clarify the climate driving mechanism of vegetation coverage change in the plateau region,the paper analyzed the response of vegetation cover to climate change in the study area by using the date of climate factors of temperature,precipitation,wind speed and sunshine and remote sensing vegetation indexes of Qinghai Plateau in the period of 1982-2015.The outcomes show that a)the vegetation coverage change of the study area is significantly correlated with the average temperature and average wind speed at the 0.01 confidence level,which is positively correlated with the average temperature change and negatively correlated with the average wind speed and;b)the main climate factors for the improvement of vegetation coverage of the plateau region are temperature increase,wind speed decrease and rainfall increase.