摘要
近年来,随着工业化和城市化步伐的加快,人类活动对生态系统的扰动日趋明显,生态环境面临空前的压力,而植被在维护生态系统方面发挥着重要作用。在人类活动与气候波动的影响下,四川省生态变化日益显著,对植被进行动态变化监测具有重要科学意义。在此背景下,基于2000~2015 GIMMS NDVI 3g.v1数据集和气温、降水数据,采用逐像元一元线性回归分析方法、相关分析与协方差等方法,对四川省2000~2015年NDVI的动态变化及其对气温和降水的响应情况进行剖析。结果表明:(1)2000~2015年间NDVI整体上呈现上升趋势,上升趋势较为显著,但变化速率较缓,且存在明显的地域性差异,表现为较明显的东增西减趋势;(2)2000~2015年间气温呈现缓慢上升趋势,降水量呈现缓慢下降趋势,且四川省2000~2015年间气温和降水均存在地域性差异,气温整体上来看呈现东增西减趋势,降水整体上呈现东减西增趋势;(3)2000~2015年间NDVI与气温呈正相关关系、NDVI与降水量呈负相关关系,且NDVI与二者的关系皆不显著。研究结果可为气候变化背景下四川省生态建设与环境保护规划提供一定的基础数据和技术支撑。
In recent years,with the acceleration of industrialization and urbanization,the disturbance of human activities on the ecosystem is becoming more and more obvious,and the ecological environment is facing unprecedented pressure.Vegetation plays an important role in maintaining the ecosystem.Under the influence of human activities and climate fluctuations,the ecological changes in Sichuan Province have become increasingly prominent,and it is of great scientific significance to monitor the dynamic changes of vegetation.In this context,based on the GIMMS NDVI 3 g.v1 dataset,temperature and precipitation data from 2000 to 2015,the dynamic changes of NDVI and its response to temperature and precipitation in Sichuan Province from 2000 to 2015 were analyzed by using the pixel-by-pixel linear regression analysis method,correlation analysis and covariance analysis.The results showed that:(1)From 2000 to 2015,NDVI presented an overall upward trend,and the upward trend was relatively significant,but the change rate was slow,and there were obvious regional differences,showing an obvious trend of increase in the east and decrease in the west;(2)From 2000 to 2015,the air temperature presented a slow rising trend,and the precipitation presented a slow declining trend.Besides,there were regional differences in the air temperature and precipitation between 2000 and 2015 in Sichuan province.On the whole,the air temperature presented an increasing trend in the east and decreasing trend in the west,while the precipitation presented an decreasing trend in the east and increasing trend in the west;(3)From 2000 to 2015,NDVI was positively correlated with air temperature,and NDVI was negatively correlated with precipitation,and NDVI was not significantly correlated with them.The research results can provide basic data and technical support for ecological construction and environmental protection planning of Sichuan province under the background of climate change.
作者
蒲泓君
邵怀勇
赖云波
张诗瑶
易俊
PU Hong-jun;SHAO Huai-yong;LAI Yun-bo;ZHANG Shi-yao;YI Jun(Chengdu University of Technology,Chengdu 610059,China;Chengdu Tongchuan Technology Co.,Ltd,Chengdu 610000,China)
出处
《四川环境》
2022年第6期107-115,共9页
Sichuan Environment
基金
国家自然科学基金:区域矿产资源开发的生态地质环境安全过程分析和预警(41302282)。
关键词
NDVI
气候波动
逐像元一元线性回归
时空相关
四川省
NDVI
climatic fluctuations
linear regression with one element per pixel
spatial temporal correlation
Sichuan province
