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

doi:10.6048/j.issn.1001-4330.2023.02.025

Abstract

Abstract:

【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.

Key words: grassland vegetation coverage; spatiotemporal change; grassland change rate; meteorological factors; correlation analysis

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。

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

CLC Number:

S812

HOU Zhixiong, JING Changqing, CHEN Chen, WANG Gongxin, GUO Wenzhang, ZHAO Weikang. Spatiotemporal Variation of Vegetation Coverage of Natural Grassland in Northern Xinjiang in Recent 20 Years and Its Relationship with Meteorological Factors[J]. Xinjiang Agricultural Sciences, 2023, 60(2): 464-471.

侯志雄, 井长青, 陈宸, 王公鑫, 郭文章, 赵苇康. 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[J]. 新疆农业科学, 2023, 60(2): 464-471.

Figures/Tables 5

Fig.1 Distribution of NDVI and FVC of grassland in Northern Xinjiang from 1998 to 2018 Note: The map is based on the standard map with drawing review No. GS (2019) 3333 downloaded from the standard map service website of China Society of Surveying and mapping, and the base map is not modified,the same as below

Fig. 2 Temporal change of vegetation coverage of natural grassland in Northern Xinjiang from 1998 to 2018

Fig.3 Grassland change rate in Northern Xinjiang from 1998 to 2018

Fig.4 Spatial distribution of meteorological factors in Northern Xinjiang

Fig.5 Correlation analysis of vegetation coverage with annual average precipitation in Northern Xinjiang

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