夏尔希里自然保护区生长季NDVI变化特征及驱动力研究  

Study on Variation Characteristics and Driving Forces of NDVI During Growing Season in Xarxili Nature Reserve

作　　者：方登先 王勇辉[1,2] FANG Dengxian;WANG Yonghui(School of Geography Science and Tourism,Xinjiang Normal University,Urumqi 830054;Laboratory of Lake Environment and Resources in Arid Areas of Xinjiang,Urumqi 830054)

机构地区：[1]新疆师范大学地理科学与旅游学院,乌鲁木齐830054 [2]新疆干旱区湖泊环境与资源实验室,乌鲁木齐830054

出　　处：《水土保持学报》2023年第2期127-135,共9页Journal of Soil and Water Conservation

基　　金：中国沙漠气象科学研究基金项目“夏尔希里自然保护区森林土壤固碳潜力研究”(Sqj2021015)。

摘　　要：采用趋势分析、相关分析、多元线性回归等方法,系统研究了夏尔希里自然保护区成立前(1990—2005年)和成立后(2006—2018年)不同植被类型归一化植被指数(NDVI)的时空变化特征及驱动NDVI变化的主要因素。结果表明:(1)不同海拔梯度上,保护区成立后的NDVI多年平均值均高于成立前;(2)保护区成立前后NDVI趋势均以增加为主,成立后NDVI的增加趋势为0.05~0.10/10 a的像元数量明显比成立前增多;(3)保护区成立前后大部分区域的NDVI均与气温呈现显著负相关,与降水呈现显著正相关(p<0.05)。(4)气温抑制低海拔(500~1500 m)草地生长,降水促进中海拔(1500~2000 m)的植被生长,土壤有机碳、气温共同驱动高海拔(2000~3000 m)的植被生长。By using the methods of trend analysis,correlation analysis and multiple linear regression,this paper systematically studied the temporal and spatial variation characteristics and the main driving factors of normalized vegetation index(NDVI)of different vegetation types changed in the establishment of Xarxili Nature Reserve before(1990—2005)and after(2006—2018).The results showed that:(1)At different altitude gradients,the annual mean of NDVI after the establishment of the nature reserve was higher than that before.(2)The trend of NDVI before and after the establishment of the NDVI was mainly increased.After the establishment of the reserve,the increasing trend of NDVI was 0.05 to 0.10/10 years,the number of pixels was significantly increased compared with that before the establishment.(3)The NDVI in most areas showed a significant negative correlation with air temperature and a significant positive correlation with precipitation(p<0.05).(4)Temperature inhibited the growth of grassland at low altitude(500~1500 m),precipitation promoted the growth of vegetation at middle altitude(1500~2000 m),and soil organic carbon and air temperature jointly drove the growth of vegetation at high altitude(2000~3000 m).

关 键 词：NDVI 变化特征 气候影响 驱动因素 夏尔希里自然保护区 

分 类 号：S715[农业科学—林学]