玉树藏族自治州草地植被覆盖变化及其自然影响因子的相关性分析  

Correlation analysis of grassland vegetation cover change and its natural influence factors in Yushu Prefecture

作　　者：周宏毅[1] 孙凡[1] 何海博 

机构地区：[1]青海大学水利电力学院,青海西宁810016 [2]中国水电基础局有限公司,天津301700

出　　处：《青海大学学报（自然科学版）》2016年第3期48-53,共6页Journal of Qinghai University(Natural Science)

摘　　要：为了揭示玉树州地区草地生态环境的变化以及主要驱动力,利用2005—2012年MOD13Q1系列的NDVI数据以及同时间序列的气象资料,以NDVI作为草地覆盖度的指示性指标分析了区域内草地植被覆盖度的变化及与各自然影响因子的相关性。分析结果表明:玉树州的草地植被覆盖度在近几年处于一个良好的恢复态势。从州域尺度上分析,影响玉树州草地覆盖度的决定性因素是气温,降雨和日照时间对草地覆盖度并没有太大的影响。在县域尺度上分析,玉树州内不同区域的草地覆盖度则对水热条件存在着不一样的相关程度。在部分地区,年均气温、夏季温度、降雨等条件的影响仍然是主要驱动因子,而日照时间与冬季温度的影响则在全部地区均不显著。In order to reveal the change of grassland ecological environment and the main driving force in Yushu Prefecture,A series of NDVI data of MOD13Q1 during 2005 and 2012 and corresponding meteorological data were explored. The NDVI of the same period was used as grassland coverage indicator to analyze the area of grassland coverage change and the natural factor correlation. Analysis results show that Yushu grassland vegetation cover has been in a good state in recent years. From the prefecture scale,the decisive factor that affects grassland coverage of Yushu is temperature,and rainfall and sunshine have few impact. From the county scale,Different areas of grassland coverage show the different degree of correlation to the water and heat conditions. The annual average air temperature,summer temperature and rainfall conditions is still the main driving factor in some parts,and the effects of sunshine duration and winter temperature are not significant in all areas.

关 键 词：玉树藏族自治州 草地生态环境 NDVI 

分 类 号：S812.29[农业科学—草业科学]