近20 a新疆北疆天然草地植被覆盖度时空变化及其与气象因子的关系  

Spatiotemporal Variation of Vegetation Coverage of Natural Grassland in Northern Xinjiang in Recent 20 Years and Its Relationship with Meteorological Factors

作　　者：侯志雄 井长青[1] 陈宸 王公鑫 郭文章 赵苇康 HOU Zhixiong;JING Changqing;CHEN Chen;WANG Gongxin;GUO Wenzhang;ZHAO Weikang(Xinjiang Key Laboratory of Grassland Resources and Ecology/College of Pratacultural and Environmental Sciences,Xinjiang Agricultural University,Urumqi 830052,China)

机构地区：[1]新疆农业大学草业与环境科学学院/新疆草地资源与生态重点实验室,乌鲁木齐830052

出　　处：《新疆农业科学》2023年第2期464-471,共8页Xinjiang Agricultural Sciences

基　　金：自治区重点实验室开放课题“基于CoLM陆面模式与RS的新疆天然草地生产力估算研究”(2020D04037)。

摘　　要：【目的】研究新疆北疆1998~2018年天然草地植被覆盖度时空变化及其与气象因子的关系,为退化草地的生态修复提供技术支持。【方法】基于多年连续的MODIS–NDVI产品数据和气象数据,利用像元二分模型对近20 a新疆北疆天然草地覆盖度进行反演,分析该区域草地植被覆盖度的时空变化及与温度、降水相关性,研究北疆天然草地植被覆盖度与气象因子的关系。【结果】(1)近20 a来,北疆天然草地植被覆盖度总体上呈现为中部和东部较低,北部、西部和南部较高的空间分布趋势。(2)天然草地变化率呈增加趋势的占比为57.51%,天然草地变化率呈降低趋势的占比为42.49%。(3)近20 a来,北疆天然草地植被覆盖度与年均降水量呈正相关的比例为81.27%,呈负相关的比例为18.73%;北疆天然草地植被覆盖度与年均气温呈负相关性所占比例为39.48%,呈正相关的比例为60.52%。【结论】新疆北疆天然草地植被覆盖度与年均降水量的相关性高于年均气温。【Objective】To explore the temporal and spatial changes of natural grassland vegetation coverage and its relationship with meteorological factors in northern Xinjiang from 1998 to 2018,so as to provide technical support for the ecological restoration of degraded grassland.【Methods】Based on the MODIS-NDVI product data and meteorological data for many years,the pixel dichotomy model was used to retrieve the natural grassland coverage in northern Xinjiang in recent 20 years and reveal the temporal and spatial changes of grassland vegetation coverage in this region,and correlation analysis was performed on temperature and precipitation,to discuss the relationship between natural grassland vegetation coverage and meteorological factors in northern Xinjiang.【Results】(1)During the study period,the vegetation coverage of natural grassland in Northern Xinjiang was generally smaller in the middle and East,and larger in the north,West and south.(2)From the state of grassland change in recent 20 years in northern Xinjiang,it could be seen that 57.51%of the grassland change rate showed an increasing trend,and 42.49%of the grassland change rate showed a decreasing trend.(3)During the study period,the proportion of negative correlation between vegetation coverage and annual precipitation was 18.73%,and the proportion of positive correlation was 81.27%;There was a negative correlation between grassland vegetation coverage and annual average temperature in northern Xinjiang,accounting for 39.48%and a positive correlation of 60.52%.【Conclusion】The results showed that the correlation between vegetation coverage and annual precipitation was higher than that of annual temperature.

关 键 词：草地植被覆盖度 时空变化 草地变化率 气象因子 相关性 

分 类 号：S812[农业科学—草业科学]