摘要
为了解我国北方农牧交错带自然环境条件下的植被群落生产能力.基于2000—2020年的遥感数据和气象数据,利用光能利用率模型(CASA)估算了北方农牧交错带内植被净初级生产力(NPP),并对时空特征变化进行分析.结果表明:(1)北方农牧交错带内多年年均植被NPP,在东北部呈中间低四周高的分布;而在中南部植被NPP的分布呈现自南、东南向北、西北减少的分布特征.(2)2000—2020年北方农牧交错带单位面积年均植被NPP为234.33 gCm^(-2)a^(-1),年均植被NPP总量为167.90×10^(12)gCm^(-2)a^(-1).(3)研究时间段内植被NPP变化以波动增加为主,其变化范围190.91~284.09 gCm^(-2)a^(-1);与2000年相比,2020年NPP增加了42.05%.(4)植被NPP增加的区域占总面积的86.98%;减少的区域占总面积的2.06%.植被NPP的时空分布特征表明了中国北方农牧交错带内植被生态系统整体得到改善.
In order to understand productivity of vegetation communities and the quality of the ecological sys⁃tem in the farming-pastoral ecotone of the northern China,the model was applied to analyze the spatial-temporal characteristics of vegetation NPP change in the farming-pastoral ecotone of the northern China from 2000—2020.The analysis showed that:(1)The annual average vegetation net primary productivity(NPP)showed in the north⁃east,a pattern of lower values in the central region and higher values in the surrounding areas,and in the south of center,a pattern of decreasing from south,southeast to north and northwest.(2)From 2000 to 2020,the average annual vegetation NPP was 234.33 gCm^(-2)a^(-1),and the total amount was 167.90×10^(12)gCm^(-2)a^(-1).(3)During the study period,the change of vegetation NPP was mainly fluctuating,and the range of change was 190.91-284.09 gCm^(-2)a^(-1),compared with 2000,NPP increased 42.05%.(4)The area with increased vegetation NPP accounted for 86.98%of the total area and the area with a decrease accounted for 2.06%of the total area.The spatial and temporal distribution characteristics of vegetation NPP indicate that the vegetation ecosystem in the farming-pastoral ecotone of the northern China had been improved as a whole.
作者
赵唯茜
杜华明
董廷旭
邢意珂
ZHAO Weixi;DU Huaming;DONG Tingxu;XING Yike(Henan Province Source of Central Line Project of South-to-North Water Diversion Ecological Environment Monitoring Center,Nanyang,Henan 474475;School of Resource and Environmental Engineering,Mianyang Teachers’College,Mianyang,Sichuan 621000)
出处
《绵阳师范学院学报》
2024年第2期113-119,共7页
Journal of Mianyang Teachers＇ College
关键词
北方农牧交错带
生态环境监测
CASA模型
净初级生产力(NPP)
the farming-pastoral ecotone of the northern
Ecological environment monitoring
CASA model
the net primary production
