摘要
【目的】区域植被指数是评价其生态系统的重要指标。喀斯特地区生境脆弱,对气候变化和人类活动均较敏感,易遭受破坏且恢复困难。本研究探讨气候要素与植被变化之间的关系,通过残差分析分离人类活动对植被的影响,定量评估其贡献。【方法】基于2001-2014年归一化植被指数数据、气象数据及土地利用数据,采用趋势分析法、偏相关分析。【结果】重庆喀斯特地区近14年NDVI整体呈现波动上升趋势,年增长率为0.0048/年,研究区内78.9%的区域植被增加,17.14%的区域植被变化不明显,只有不到4%的区域植被出现退化;气候变化对植被的影响远高于人类活动,气温的相关性高于降水,主要表现为正相关;其中气候变化的贡献率为94.6%,人类活动贡献率为5.4%;研究区实际NDVI值与模拟NDVI值之间的平均残差为0.0397。【结论】人类活动对植被的影响表现为正向,重庆针对喀斯特地区的生态恢复工程已初见成效。
【Objective】Regional vegetation index is an important index to evaluate its ecosystem.Karst areas are vulnerable to climate change and human activities,vulnerable to damage and difficult to restore.The present paper aimed to explore the relationship between climate fac-tors and vegetation change,and used the residual analysis to separate the impact of human activities on vegetation and quantitatively evaluate its contribution.【Method】Based on the normalized difference vegetation index data,meteorological data and land use data from 2001 to 2014,the trend analysis method and partial correlation analysis were used.【Result】The results showed that the NDVI in Chongqing karst ar-eas showed a trend of fluctuation and increase in recent 14 years,with an annual growth rate of 0.0048/year.78.9%of the regional vegeta-tion in the study area increased 17.14%.Only less than 4%of the regional vegetation was degraded;The impact of climate change on veg-etation was much higher than that of human activities,and the correlation of temperature was higher than that of precipitation,mainly show-ing a positive correlation;The contribution rate of climate change was 94.6%,and the contribution rate of human activities was 5.4%.The average residual between the actual NDVI value and the simulated NDVI value in the study area was 0.0397.【Conclusion】The impact of human activities on vegetation was positive,and the ecological restoration project in Chongqing for karst areas has achieved initial results.
作者
管艳霞
龙晓泳
李维杰
GUAN Yan-xia;LONG Xiao-yong;LI Wei-jie(School of Geographical Science,Southwest University,Chongqing 400715,China)
出处
《西南农业学报》
CSCD
北大核心
2021年第1期165-173,共9页
Southwest China Journal of Agricultural Sciences
基金
国家自然科学基金项目(41877369)。
