1998—2018年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

doi:10.13304/j.nykjdb.2021.0881

摘要/Abstract

摘要：

为分析北疆天然草地植被覆盖度在生长季不同月份的时空变化及其与气象因子的关系，采用像元二分模型、变化率分析和相关分析探讨了北疆1998—2018年6—9月天然草地植被覆盖度的时空变化及其与气象因子的关系。结果表明，北疆天然草地植被覆盖度空间上呈现降水较少、气温较高的中部和东部较低，海拔较高、降水较多且相对湿度较高的北部、西部和南部较高，由中部和东部向北部、西部和南部三面波动增加。北疆天然草地植被覆盖度在6、7、8和9月呈降低趋势，月平均值表现为6月>7月>9月>8月。北疆天然草地归一化植被指数7月为增加趋势，6、8和9月为减少趋势，整体上波动较小。6、7和8月北疆月平均天然草地植被覆盖度与降水和相对湿度呈正相关关系，9月与气温和日照时数呈正相关关系。

关键词: 草地植被覆盖度, 时空变化, 气象因子, 相关性分析

Abstract:

In order to analyze the temporal and spatial changes of natural grassland vegetation coverage in different months of the growing season in Northern Xinjiang and its relationship with meteorological factors， the pixel dichotomy model， change rate analysis and correlation analysis were used to explore the temporal and spatial changes of natural grassland vegetation coverage and its relationship with meteorological factors in Northern Xinjiang in June， July， August and September from 1998 to 2018. The results showed that the vegetation coverages of natural grassland in Northern Xinjiang were lower in the middle and east with less precipitation and higher temperature， higher in the north， west and south with higher altitude， more precipitation and higher relative humidity， which increased from the middle and east to the north， west and south. In June， July， August and September， the natural grassland vegetation coverage in Northern Xinjiang showed no significant decreasing trend， in which the monthly average natural grassland coverage was June>July>September>August. The normalized difference vegetation index of natural grassland in Northern Xinjiang showed an increasing trend in July and decreasing trend in June， August and September. The monthly average natural grassland vegetation coverages in Northern Xinjiang were mainly positively correlated with precipitation and relative humidity in June， July and August， and were mainly positively correlated with temperature and sunshine hours in September.

Key words: grassland fractional vegetation cover, temporal and spatial variation, meteorological factors, correlation analysis

中图分类号:

S812

侯志雄, 井长青, 王公鑫, 郭文章, 赵苇康. 1998—2018年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]. 中国农业科技导报, 2023, 25(2): 140-151.

Zhixiong HOU, Changqing JING, Gongxin WANG, Wenzhang GUO, Weikang ZHAO. Temporal and Spatial Variation of Natural Grassland Vegetation Coverage and Its Relationship with Meteorological Factors in Northern Xinjiang from 1998 to 2018[J]. Journal of Agricultural Science and Technology, 2023, 25(2): 140-151.

图/表 9

图1 北疆高程图

Fig. 1 Altitude distribution in Northern Xinjiang

图2 1998—2018年北疆天然草地月平均植被覆盖度

Fig. 2 Monthly average FVC of natural grassland in Northern Xinjiang from 1998 to 2018

图3 1998—2018年北疆天然草地分时段月平均植被覆盖度

Fig. 3 Monthly average FVC of natural grassland in Northern Xinjiang from 1998 to 2018

图4 1998—2018年北疆天然草地NDVI月平均变化率

Fig. 4 Monthly average change rate of NDVI of natural grassland in Northern Xinjiang from 1998 to 2018

图5 1998—2015年北疆气象因子空间变化

Fig. 5 Spatial variation of meteorological factors in Northern Xinjiang from 1998 to 2015

图6 1998—2015年北疆天然草地植被覆盖度与气温的相关分析

Fig. 6 Correlation analysis of natural grassland vegetation coverage and temperature in Northern Xinjiang from 1998 to 2015

图7 1998—2015年北疆天然草地植被覆盖度与降水的相关分析

Fig. 7 Correlation analysis of natural grassland vegetation coverage and precipitation in Northern Xinjiang from 1998 to 2015

图8 1998—2015年北疆天然草地植被覆盖度与月日照时数的相关分析

Fig. 8 Correlation analysis of natural grassland vegetation coverage and monthly sunshine hours in Northern Xinjiang from 1998 to 2015

图9 1998—2015年北疆天然草地植被覆盖度与月相对湿度的相关分析

Fig. 9 Correlation analysis of natural grassland vegetation coverage and monthly relative humidity in Northern Xinjiang from 1998 to 2015

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