Based on the statistical analysis method,this paper studies the temporal and spatial correlation between drought and snow disasters and El Nino/La Nina events in various counties of Xilingol League.According to the re...Based on the statistical analysis method,this paper studies the temporal and spatial correlation between drought and snow disasters and El Nino/La Nina events in various counties of Xilingol League.According to the research results,it is found that the number of disasters in Xilingol League in El Nino/La Nina year accounts for 54%of the total number of disasters in Xilingol League.El Nino has more disasters than La Nina.In El Nino/La Nina years,the frequency of snow disasters in Xilingol League is higher than that of drought disasters.The areas with high frequency of El Nino disasters are East Ujimqin Banner,West Ujimqin Banner and Abaga Banner.The areas with high frequency of disasters in La Nina are Sonid Zuoqi,Erenhot,Xilinhot and Xianghuang Banner.Using statistical analysis method can accurately and effectively study whether there is obvious correlation between drought and snow disasters and El Nino/La Nina events in Xilingol League,and enrich the methods and contents in geography education and research,which is of great significance for monitoring and preventing drought and snow disasters in Xilingol League.展开更多
Natural grasslands are increasingly subjected to the dual stresses of grazing pressures and climate change.However,the contribution of human activities,especially grassland ecology conservation projects,to grassland i...Natural grasslands are increasingly subjected to the dual stresses of grazing pressures and climate change.However,the contribution of human activities,especially grassland ecology conservation projects,to grassland improvement remains ambiguous.Utilizing MODIS satellite data in conjunction with the VPM model,the gross primary productivity(GPP)changes in the Xilingol grassland from 2000 to 2020 were assessed.Based on GPP data derived from remote sensing,this study quantitatively assessed the spatiotemporal dynamics of the impacts of climate change and human activities on the productivity of grassland in the Xilingol League.From 2000 to 2020,the grasslands exhibited a greening trend characterized by a significant annual GPP increment of 2.66 gC m^(-2) yr^(-1)(P<0.05).Climate change and human activities jointly contributed to this greening trend,with relative contribution rates of 55%and 45%,respectively.However,the relative contributions of climate change and human activities to the trend of GPP varied greatly in different regions.Climate change emerged as the principal driver in the central and eastern regions of Xilingol League with robust grass growth,accounting for more than 65%of the GPP enhancement.Conversely,human activities were the dominant factors in less verdant western regions and the agro-pastoral ecotone,representing more than 60%of the GPP change.Grassland productivity was sensitive to grassland ecological restoration measures,with significant changes in the trends of grassland productivity attributed to human activities in pivotal policy implementation years such as 2005 and 2011.Specifically,measures such as the control of wind/sand sources and returning grazing land to grassland from 2000 to 2005 gradually alleviated the pressure of human activities on grassland productivity,as they significantly improved vegetation growth in high-quality grasslands.Under the forage-livestock balance policy from 2005 to 2011,inadequate compensation for grassland ecological protection led to a significant reduction in GPP,as some herders increased their livestock holdings despite grazing restrictions,and this particularly affected the high-quality grasslands.The implementation of the Grassland Ecological Protection Subsidy and Reward Program from 2011 to 2020 generally promoted the recovery of productivity in eastern and western Xilingol League grasslands,but significant ecological pressure persisted.This study provides theoretical support for optimizing grassland ecosystem management and forming a virtuous cycle of grassland conservation in pastoral areas.展开更多
基金Research on drought sandstorm disaster chain in Xilingol grassland(CXJJS19133)supported by the postgraduate research and innovation fund of Inner Mongolia Normal Universitythe postgraduate education innovation program of Inner Mongolia Autonomous Region.
文摘Based on the statistical analysis method,this paper studies the temporal and spatial correlation between drought and snow disasters and El Nino/La Nina events in various counties of Xilingol League.According to the research results,it is found that the number of disasters in Xilingol League in El Nino/La Nina year accounts for 54%of the total number of disasters in Xilingol League.El Nino has more disasters than La Nina.In El Nino/La Nina years,the frequency of snow disasters in Xilingol League is higher than that of drought disasters.The areas with high frequency of El Nino disasters are East Ujimqin Banner,West Ujimqin Banner and Abaga Banner.The areas with high frequency of disasters in La Nina are Sonid Zuoqi,Erenhot,Xilinhot and Xianghuang Banner.Using statistical analysis method can accurately and effectively study whether there is obvious correlation between drought and snow disasters and El Nino/La Nina events in Xilingol League,and enrich the methods and contents in geography education and research,which is of great significance for monitoring and preventing drought and snow disasters in Xilingol League.
基金The National Key Research and Development Program of China(2022YFF1301802)。
文摘Natural grasslands are increasingly subjected to the dual stresses of grazing pressures and climate change.However,the contribution of human activities,especially grassland ecology conservation projects,to grassland improvement remains ambiguous.Utilizing MODIS satellite data in conjunction with the VPM model,the gross primary productivity(GPP)changes in the Xilingol grassland from 2000 to 2020 were assessed.Based on GPP data derived from remote sensing,this study quantitatively assessed the spatiotemporal dynamics of the impacts of climate change and human activities on the productivity of grassland in the Xilingol League.From 2000 to 2020,the grasslands exhibited a greening trend characterized by a significant annual GPP increment of 2.66 gC m^(-2) yr^(-1)(P<0.05).Climate change and human activities jointly contributed to this greening trend,with relative contribution rates of 55%and 45%,respectively.However,the relative contributions of climate change and human activities to the trend of GPP varied greatly in different regions.Climate change emerged as the principal driver in the central and eastern regions of Xilingol League with robust grass growth,accounting for more than 65%of the GPP enhancement.Conversely,human activities were the dominant factors in less verdant western regions and the agro-pastoral ecotone,representing more than 60%of the GPP change.Grassland productivity was sensitive to grassland ecological restoration measures,with significant changes in the trends of grassland productivity attributed to human activities in pivotal policy implementation years such as 2005 and 2011.Specifically,measures such as the control of wind/sand sources and returning grazing land to grassland from 2000 to 2005 gradually alleviated the pressure of human activities on grassland productivity,as they significantly improved vegetation growth in high-quality grasslands.Under the forage-livestock balance policy from 2005 to 2011,inadequate compensation for grassland ecological protection led to a significant reduction in GPP,as some herders increased their livestock holdings despite grazing restrictions,and this particularly affected the high-quality grasslands.The implementation of the Grassland Ecological Protection Subsidy and Reward Program from 2011 to 2020 generally promoted the recovery of productivity in eastern and western Xilingol League grasslands,but significant ecological pressure persisted.This study provides theoretical support for optimizing grassland ecosystem management and forming a virtuous cycle of grassland conservation in pastoral areas.
