【目的】评估内蒙古草地生态系统质量变化情况,全面掌握草原保护措施实施效果。【方法】依据2000年、2010年、2015年的遥感数据,综合应用地理信息系统和模型计算方法,对内蒙古草地面积及分布、生态系统质量、生态系统服务能力进行分析...【目的】评估内蒙古草地生态系统质量变化情况,全面掌握草原保护措施实施效果。【方法】依据2000年、2010年、2015年的遥感数据,综合应用地理信息系统和模型计算方法,对内蒙古草地面积及分布、生态系统质量、生态系统服务能力进行分析。【结果】内蒙古从东部到西部均有草地分布;2000—2015年草地面积减少了1181.99 km^(2);草地植被覆盖度由42.52%提高至46.50%;草地植被净初级生产力(NPP)从147.45 g C/m^(2)增加到169.73 g C/m^(2);草地载畜能力明显提升,载畜能力大于100羊单位/km^(2)的面积增加了52507.75 km^(2)。【结论】2000—2015年内蒙古草地生态系统质量有一定程度的提升,促进了草地生态系统服务能力的提高,说明实施的草原保护政策与工程对内蒙古草地生态起到了有效的保护作用。展开更多
Warming and precipitation are key global change factors driving soil carbon(C)dynamics in terrestrial ecosystems.However,the effects of warming and altered precipitation on soil microbial diversity and functional gene...Warming and precipitation are key global change factors driving soil carbon(C)dynamics in terrestrial ecosystems.However,the effects of warming and altered precipitation on soil microbial diversity and functional genes involved in soil C cycling remain largely unknown.We investigated the effects of warming and increased precipitation on soil C cycling in a temperate desert steppe of Inner Mongolia using metagenomic sequencing.We found that warming reduced plant richness,Shannon-Wiener and Simpson index.In contrast,increased precipitation signifcantly infuenced Shannon-Wiener and Simpson index.Warming reduced soil microbial species by 5.4%while increased precipitation and warming combined with increased precipitation led to increases in soil microbial species by 23.3%and 2.7%,respectively.The relative abundance of Proteobacteria,which involve C cycling genes,was signifcantly increased by warming and increased precipitation.Warming signifcantly reduced the abundance of GAPDH(Calvin cycle)and celF(cellulose degradation)while it enhanced the abundance of glxR(lignin degradation).Increased precipitation signifcantly enhanced the abundance of pgk(Calvin cycle),coxL(carbon monoxide oxidation),malZ(starch degradation),and mttB(methane production).Moreover,a wide range of correlations among soil properties and C cycling functional genes was detected,suggesting the synergistic and/or antagonistic relationships under scenario of global change.These results may suggest that warming is benefcial to soil C storage while increased precipitation negatively affects soil C sequestration.These fndings provide a new perspective for understanding the response of microbial communities to warming and increased precipitation in the temperate desert steppe.展开更多
文摘【目的】评估内蒙古草地生态系统质量变化情况,全面掌握草原保护措施实施效果。【方法】依据2000年、2010年、2015年的遥感数据,综合应用地理信息系统和模型计算方法,对内蒙古草地面积及分布、生态系统质量、生态系统服务能力进行分析。【结果】内蒙古从东部到西部均有草地分布;2000—2015年草地面积减少了1181.99 km^(2);草地植被覆盖度由42.52%提高至46.50%;草地植被净初级生产力(NPP)从147.45 g C/m^(2)增加到169.73 g C/m^(2);草地载畜能力明显提升,载畜能力大于100羊单位/km^(2)的面积增加了52507.75 km^(2)。【结论】2000—2015年内蒙古草地生态系统质量有一定程度的提升,促进了草地生态系统服务能力的提高,说明实施的草原保护政策与工程对内蒙古草地生态起到了有效的保护作用。
基金funded by the National Key Research and Development Program of China(2022YFF130180)the Scientifc and Technological Achievements Commercialization Project of Inner Mongolia(2020CG0064).Confict of interest statement.The authors declare that they have no confict of interest.
文摘Warming and precipitation are key global change factors driving soil carbon(C)dynamics in terrestrial ecosystems.However,the effects of warming and altered precipitation on soil microbial diversity and functional genes involved in soil C cycling remain largely unknown.We investigated the effects of warming and increased precipitation on soil C cycling in a temperate desert steppe of Inner Mongolia using metagenomic sequencing.We found that warming reduced plant richness,Shannon-Wiener and Simpson index.In contrast,increased precipitation signifcantly infuenced Shannon-Wiener and Simpson index.Warming reduced soil microbial species by 5.4%while increased precipitation and warming combined with increased precipitation led to increases in soil microbial species by 23.3%and 2.7%,respectively.The relative abundance of Proteobacteria,which involve C cycling genes,was signifcantly increased by warming and increased precipitation.Warming signifcantly reduced the abundance of GAPDH(Calvin cycle)and celF(cellulose degradation)while it enhanced the abundance of glxR(lignin degradation).Increased precipitation signifcantly enhanced the abundance of pgk(Calvin cycle),coxL(carbon monoxide oxidation),malZ(starch degradation),and mttB(methane production).Moreover,a wide range of correlations among soil properties and C cycling functional genes was detected,suggesting the synergistic and/or antagonistic relationships under scenario of global change.These results may suggest that warming is benefcial to soil C storage while increased precipitation negatively affects soil C sequestration.These fndings provide a new perspective for understanding the response of microbial communities to warming and increased precipitation in the temperate desert steppe.
