植被是生态系统的主要组成部分,在调节全球气候变化和生态平衡方面有重要作用,是气候变化的指示器。因此,研究植被弹性和抗性及影响因素对区域植被稳定性现状和生态可持续发展具有重要意义。基于2000—2019年MOD13A2 NDVI数据、气象数据和植被类型数据,通过自回归模型、趋势分析及地理空间分析方法,对内蒙古植被稳定性及其影响因素进行了探讨。结果表明:内蒙古森林、草甸草原和荒漠草原区NDVI在2000—2019年期间呈增加趋势,植被覆盖整体上趋于改善;植被弹性指标与森林、草甸草原平均NDVI拟合度较差,与荒漠草原NDVI拟合度较高,表示森林和草甸草原植被弹性较大、荒漠草原植被弹性低;荒漠草原对降水和气温抗性较大,森林、草甸草原对气温抗性较小。上述结果表明内蒙古地区的不同类型植被弹性随气候因素变化而变化,并且降水是内蒙古地区植被覆盖变化的主导限制因素。
Abstract
As a major component of ecosystem, vegetation plays a vital role in regulating global climate change and ecological balance. It is an indicator of climate change. The study of vegetation elasticity, vegetation resistance and their influencing factors is of great significance to regional vegetation stability and ecological sustainable development. Based on the MOD13A2 normalized difference vegetation index (NDVI) data, meteorological data and vegetation type data from 2000 to 2019, we discussed the vegetation stability and its influencing factors in Inner Mongolia through autoregressive model, trend analysis and geospatial analysis. Results illustrated that the NDVI of forest, meadow grassland and desert grassland in Inner Mongolia increased from 2000 to 2019, and vegetation coverage tended to improve as a whole. The fitting degree between vegetation elastic index and average NDVI of forest and meadow steppe is low, and the fitting degree between vegetation elastic index and NDVI of desert steppe is higher, which indicates that the vegetation elasticity of forest and meadow steppe is high, and that of desert steppe is low. Desert steppe is more resistant to precipitation and temperature, while forest and meadow steppe are less resistant to temperature. The results suggest that the elasticity of different types of vegetation in Inner Mongolia varies with climate factors, and precipitation is the major limiting factor of vegetation change in Inner Mongolia.
关键词
植被稳定性 /
归一化植被指数(NDVI) /
植被类型 /
弹性指标 /
抗性指标 /
内蒙古
Key words
vegetation stability /
NDVI /
vegetation type /
elastic index /
resistance index /
Inner Mongolia
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基金
内蒙古自治区科技成果转化专项(2019GG015);内蒙古自治区科技计划项目(2020GG0047);内蒙古自治区自然科学基金联合项目(2020LH04003)
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