生态敏感性评价是分析区域稳定性的重要手段,可为沙漠地区开展分区治沙工作提供技术支持。以乌兰布和沙漠为研究地,选取高程、坡度、坡向、植被覆盖度、土地荒漠化、土地覆盖利用6个因子构建乌兰布和沙漠生态敏感性评价体系,基于层次分...生态敏感性评价是分析区域稳定性的重要手段,可为沙漠地区开展分区治沙工作提供技术支持。以乌兰布和沙漠为研究地,选取高程、坡度、坡向、植被覆盖度、土地荒漠化、土地覆盖利用6个因子构建乌兰布和沙漠生态敏感性评价体系,基于层次分析法(Analytic hierarchy process,AHP)及地理信息系统(Greographic information system,GIS)技术开展生态敏感性分析与评价,共分成5类敏感性等级。结果表明:乌兰布和沙漠整体生态敏感性较低,且呈现出自西向东逐渐增强的规律,植被覆盖度是影响其分布的主要因子,其次为土地覆盖利用;轻度敏感占53.12%,其次为不敏感,占34.44%,中度、高度和极度敏感占比依次为8.70%、2.50%和1.24%;高敏感地区主要分布在东北和东南部,与水体、植被和人类活动程度分布趋势相似。研究结果有望对乌兰布和沙漠地区因地制宜开展防沙治沙工作提供一定参考。展开更多
The rhizosphere bacteria play crucial roles in plant health and growth as they are involved in assimilating nutrients and resisting adverse conditions such as nutrient stress,drought,and wind erosion.Agriophyllum squa...The rhizosphere bacteria play crucial roles in plant health and growth as they are involved in assimilating nutrients and resisting adverse conditions such as nutrient stress,drought,and wind erosion.Agriophyllum squarrosum(L.)Moq.is a pioneer plant used in sand fixation due to its strong resistance to drought and wind erosion.However,the bacterial community characteristics and ecological function in the rhizosphere of A.squarrosum are poorly understood.In this study,soil samples were collected from different developmental stages(seedling stage,vegetative stage,reproductive stage,and withering stage)of A.squarrosum.Illumina Miseq sequencing was used to detect differences in soil bacterial abundance.The Phylogenetic Investigation of Communities by Reconstruction of Unobserved States(PICRUSt)program was used to predict bacterial functions,and the relationships among bacteria,functional populations,and soil nutrients were examined using a heatmap analysis.The results showed that the Shannon and Sobs indices of rhizosphere bacteria were significantly higher during the reproductive stage than during the other stages.Pantoea sp.(7.03%)was the dominant genus during the seedling stage;Arthrobacter sp.was the dominant genus during the vegetative(13.94%),reproductive(7.57%),and withering(12.30%)stages.The relative abundances of Chloroflexi,Acidobacteria,and Gemmatimonadetes were significantly high during the reproductive stage.According to the PICRUSt analysis,membrane transport,signal transduction,and environmental adaptation of the bacterial functional population occurred during the seedling stage.Carbohydrate metabolism increased during the vegetative stage,while energy metabolism,lipid metabolism,and biosynthesis of other secondary metabolites of the bacterial functional population significantly increased during the reproductive stage.The abundances of bacterial communities,functional genes,and soil nutrients were synergistically altered during various developmental stages.Our findings suggest that the developmental stages of A.squarrosum play a significant role in defining the composition and structure of bacterial communities in the rhizosphere.The results will provide a basis for better prediction and understanding of soil bacterial metabolic potential and functions of A.squarrosum rhizosphere in sandy areas.展开更多
文摘生态敏感性评价是分析区域稳定性的重要手段,可为沙漠地区开展分区治沙工作提供技术支持。以乌兰布和沙漠为研究地,选取高程、坡度、坡向、植被覆盖度、土地荒漠化、土地覆盖利用6个因子构建乌兰布和沙漠生态敏感性评价体系,基于层次分析法(Analytic hierarchy process,AHP)及地理信息系统(Greographic information system,GIS)技术开展生态敏感性分析与评价,共分成5类敏感性等级。结果表明:乌兰布和沙漠整体生态敏感性较低,且呈现出自西向东逐渐增强的规律,植被覆盖度是影响其分布的主要因子,其次为土地覆盖利用;轻度敏感占53.12%,其次为不敏感,占34.44%,中度、高度和极度敏感占比依次为8.70%、2.50%和1.24%;高敏感地区主要分布在东北和东南部,与水体、植被和人类活动程度分布趋势相似。研究结果有望对乌兰布和沙漠地区因地制宜开展防沙治沙工作提供一定参考。
基金supported by the Natural Science Foundation Project of Inner Mongolia Autonomous Region(2024LHMS03017)Research Capacity Enhancement“Unveiling and Leading”Project of Inner Mongolia Forestry Science Research Institute(2024NLTS03).
文摘The rhizosphere bacteria play crucial roles in plant health and growth as they are involved in assimilating nutrients and resisting adverse conditions such as nutrient stress,drought,and wind erosion.Agriophyllum squarrosum(L.)Moq.is a pioneer plant used in sand fixation due to its strong resistance to drought and wind erosion.However,the bacterial community characteristics and ecological function in the rhizosphere of A.squarrosum are poorly understood.In this study,soil samples were collected from different developmental stages(seedling stage,vegetative stage,reproductive stage,and withering stage)of A.squarrosum.Illumina Miseq sequencing was used to detect differences in soil bacterial abundance.The Phylogenetic Investigation of Communities by Reconstruction of Unobserved States(PICRUSt)program was used to predict bacterial functions,and the relationships among bacteria,functional populations,and soil nutrients were examined using a heatmap analysis.The results showed that the Shannon and Sobs indices of rhizosphere bacteria were significantly higher during the reproductive stage than during the other stages.Pantoea sp.(7.03%)was the dominant genus during the seedling stage;Arthrobacter sp.was the dominant genus during the vegetative(13.94%),reproductive(7.57%),and withering(12.30%)stages.The relative abundances of Chloroflexi,Acidobacteria,and Gemmatimonadetes were significantly high during the reproductive stage.According to the PICRUSt analysis,membrane transport,signal transduction,and environmental adaptation of the bacterial functional population occurred during the seedling stage.Carbohydrate metabolism increased during the vegetative stage,while energy metabolism,lipid metabolism,and biosynthesis of other secondary metabolites of the bacterial functional population significantly increased during the reproductive stage.The abundances of bacterial communities,functional genes,and soil nutrients were synergistically altered during various developmental stages.Our findings suggest that the developmental stages of A.squarrosum play a significant role in defining the composition and structure of bacterial communities in the rhizosphere.The results will provide a basis for better prediction and understanding of soil bacterial metabolic potential and functions of A.squarrosum rhizosphere in sandy areas.
