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
为了探讨复合干热事件对锡林郭勒草原植被总初级生产力(GPP)的影响,本研究基于2000—2023年植被生长季(5—10月)MODIS GPP和TerraClimate潜在蒸散量、最高温度与降水量数据集,通过标准化温度指数(STI)和标准化降水蒸散指数(SPEI)构建标...为了探讨复合干热事件对锡林郭勒草原植被总初级生产力(GPP)的影响,本研究基于2000—2023年植被生长季(5—10月)MODIS GPP和TerraClimate潜在蒸散量、最高温度与降水量数据集,通过标准化温度指数(STI)和标准化降水蒸散指数(SPEI)构建标准化复合干热指数(SCDHI)。在此基础上,运用Theil-Sen趋势分析及Mann-Kendall非参数检验法分析研究区SCDHI和GPP的时空演变特征,并采用偏相关分析和岭回归分析方法,定量揭示STI、SPEI和SCDHI与GPP的相关性及相对贡献。结果表明:2000—2023年,研究区植被生长季GPP整体表现为非显著上升趋势(0.79 g C·m^(-2)·a^(-1)),SCDHI以0.005·a^(-1)的速率呈非显著下降趋势。研究区84.3%区域的SPEI与GPP之间呈正相关关系,显著负相关面积仅占比0.2%;69%地区的STI与GPP呈负相关,少数地区呈正相关,显著正相关区域占比1.8%;大部分地区的SCDHI与GPP呈负相关关系,显著负相关地区主要分布在中部和西部,面积占比为47%。SPEI在研究区东北部和南部地区对GPP具有显著的主导调控作用;STI在苏尼特左旗西北部和多伦县等地区对GPP的相对贡献较大;GPP在西部和南部地区受复合干热事件的影响较大。本研究对深入了解复合干热事件的形成机理及指导该地区制定防灾减灾策略具有重要意义。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.
文摘为了探讨复合干热事件对锡林郭勒草原植被总初级生产力(GPP)的影响,本研究基于2000—2023年植被生长季(5—10月)MODIS GPP和TerraClimate潜在蒸散量、最高温度与降水量数据集,通过标准化温度指数(STI)和标准化降水蒸散指数(SPEI)构建标准化复合干热指数(SCDHI)。在此基础上,运用Theil-Sen趋势分析及Mann-Kendall非参数检验法分析研究区SCDHI和GPP的时空演变特征,并采用偏相关分析和岭回归分析方法,定量揭示STI、SPEI和SCDHI与GPP的相关性及相对贡献。结果表明:2000—2023年,研究区植被生长季GPP整体表现为非显著上升趋势(0.79 g C·m^(-2)·a^(-1)),SCDHI以0.005·a^(-1)的速率呈非显著下降趋势。研究区84.3%区域的SPEI与GPP之间呈正相关关系,显著负相关面积仅占比0.2%;69%地区的STI与GPP呈负相关,少数地区呈正相关,显著正相关区域占比1.8%;大部分地区的SCDHI与GPP呈负相关关系,显著负相关地区主要分布在中部和西部,面积占比为47%。SPEI在研究区东北部和南部地区对GPP具有显著的主导调控作用;STI在苏尼特左旗西北部和多伦县等地区对GPP的相对贡献较大;GPP在西部和南部地区受复合干热事件的影响较大。本研究对深入了解复合干热事件的形成机理及指导该地区制定防灾减灾策略具有重要意义。
文摘利用MODIS MOD17A3植被初级生产力数据产品及地面气象观测数据,研究分析了2000-2010年锡林郭勒盟草原NPP的时空变化特征、各气候因子的年际变化特征及NPP与气候因子的相关关系。结果表明,锡林郭勒盟草原NPP的分布由东向西逐渐减小,值大多分布在0-0.5 kg C·m-2;2001-2010年NPP呈现波动变化,整体呈增加趋势,空间分布上更加趋于均匀分布;2000-2010年,研究区内典型草原和荒漠草原各气候因子的变化趋势大致相同,4-9月累计平均气温、平均相对湿度和累计日照时数呈减小趋势,平均风速呈增加趋势,累计降水量典型草原呈轻微减少趋势,荒漠草原呈增加趋势,趋势斜率分别为-0.026和1.044 5,典型草原大部分气候因子的波动程度大于荒漠草原;研究区内两种类型的草原的NPP均与4-9月累计平均气温、平均日最低气温有较强的负相关关系（显著水平分别为P〈0.001和P〈0.01）,与累计降水量、平均相对湿度有较强的正相关关系（显著水平为P〈0.01）,与4-9月累计日照时数、平均风速呈负相关关系但相关关系较弱,荒漠草原对气候因子变化的响应总体不如典型草原敏感。
