成渝双城经济圈NPP时空变化及气候因子驱动分析Analysis on spatial-temporal changes of NPP and the climate driving factors in Chengdu-Chongqing economic circle
梁帅,辛宇,辜寄蓉
LIANG Shuai,Xin Yu,GU Jirong
摘要(Abstract):
为探究成渝地区双城经济圈NPP时空变化及与气候的关系,基于MOD17A3产品NPP数据,采用一元线性回归模型模拟2001—2020年植被NPP演变趋势,分析植被NPP变化特征,结合ANUSPLIN插值的气象数据,采用相关性分析法定量分析气候变化对研究区植被NPP变化的影响。研究表明:(1)研究区内植被NPP整体呈现缓慢增长的趋势,增长率为7.53 g C·m~(-2)·a~(-1),同时植被NPP均值分布呈现四周高中间低的空间格局。(2)研究区内气候因子对植被NPP变化的影响存在空间异质性,在眉山市、乐山市、雅安市以及重庆市黔江区、彭水县部分地区气温与植被NPP负相关关系明显,其呈正相关关系的区域广泛分布在成渝城市群的中部和东部;降水与植被NPP呈正相关关系的区域面积占比达到92.46%。(3)研究区主要受非气候因子影响,面积占比高达86.87%,说明人类活动对植被NPP变化的影响愈来愈烈,研究人为影响应是成渝城市群生态修复的重点。
In order to explore the temporal and spatial changes of NPP and the relationship with climate in ChengduChongqing economic circle, based on the NPP data of MOD17A3 product, the evolution trend of vegetation NPP in2001-2020 was simulated by one-dimensional linear regression model, and the change characteristics of vegetation NPP were analyzed. Combined with the meteorological data interpolated by ANUSPLIN, the impact of climate change on vegetation NPP changes in the study area was quantitatively analyzed by correlation analysis. The research resluts showed that:(1) The overall NPP of vegetation in the study area showed a slow growth trend, with a growth rate of 7.53 g C·m-2· a-1.Meanwhile, the mean distribution of NPP of vegetation showed a spatial pattern of high around and low in the middle.(2) There was spatial heterogeneity in the effects of climate factors on the changes of vegetation NPP in the study area.The negative correlation between air temperature and NPP was obvious in some areas of Meishan City, Leshan City,Ya'an City, Qianjiang District and Pengshui County of Chongqing City, and the positive correlation was widely distributed in the central and eastern part of Chengdu-Chongqing urban agglomeration. The positive correlation between precipitation and vegetation NPP accounted for 92.46% of the total area.(3) The study area was mainly affected by nonclimate factors, accounting for 86.87% of the total area, indicating that human activities had a more and more intense impact on vegetation NPP changes, and the study of human effects should be the focus of ecological restoration in Chengdu-Chongqing urban agglomeration.
关键词(KeyWords):
成渝经济圈;NPP变化;ANUSPLIN插值;气候驱动
Chengdu-Chongqing economic circle;NPP change;ANUSPLIN interpolation;climate driving
基金项目(Foundation):
作者(Author):
梁帅,辛宇,辜寄蓉
LIANG Shuai,Xin Yu,GU Jirong
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- 成渝经济圈
- NPP变化
- ANUSPLIN插值
- 气候驱动
Chengdu-Chongqing economic circle - NPP change
- ANUSPLIN interpolation
- climate driving