摘要
植被净初级生产力(NPP)可以直接反映植被在自然环境中的生产能力,利用遥感影像、气温降水数据结合简单差值法、趋势分析法以及线性回归分析对呼伦贝尔沙地河流湿地NPP进行了时空变化研究与驱动力分析。结果表明:时间上,呼伦贝尔沙地河流湿地NPP呈现波动式增长,NPP增长面积可达整个湿地面积的92.51%,年增长率为0~2gC/(m^2·a);空间上,河流湿地NPP值呈现东高西低格局。而15年间NPP增加最快的湿地为处于西部的克鲁伦河湿地,增长面积可达99.5%;气候变化与人类活动是导致NPP变化的两个重要因素,NPP增长与降水量呈显著正相关(R=0.703),与气温呈显著负相关(R=-0.559)。经济产业结构的变化使得人类活动对生态环境的压力减小,促使湿地NPP的增加。同时,国家政策以及治沙工程同样影响着NPP的变化。
Net primary productivity(NPP)can directly reflect the production capacity of the vegetation in the natural environment.the NPP of River Wetland in Hulun Buir sandy land on air changes and driving force were analyzed using the data of temperature and precipitation and combining with remote sensing images,simple difference method and trend analysis and linear regression.The results showed that:considering the time,the sandy land in Hulun Buir River Wetland NPP presented the fluctuant growth,NPP growth in the area of wetland accounted for up to 92.51% of area,the annual growth rate was between 0~2 gC/(m^2·a);with respect to the space,NPP presented the distribution of the east high west low;during the 15 years,the wetland with fastest growing NPP is in Western Herlen wetland with growth area of up to 99.5%;climate change and human activities are two important factors that lead to the changes of NPP,NPP is significantly correlated with the increase of precipitation(R=0.703),negatively correlated with temperature(R=-0.559).The change of the economic industrial structure makes the pressure of human activities on the ecological environment decrease,which leads to the increase of NPP.At the same time,the national policy and the sand control project also affect the change of NPP.
出处
《水土保持研究》
CSCD
北大核心
2017年第6期267-272,共6页
Research of Soil and Water Conservation
基金
内蒙古师范大学研究生科研创新项目(CXJJS16109)
内蒙古自治区研究生教育计划(S20161013509)
内蒙古自治区自然基金(2013ZD08)
关键词
植被净初级生产力
时空变化
驱动力分析
河流湿地
net primary productivity
temporal and spatial variation
driving force analysis
river wetland
