内蒙古典型草原不同群落类型土壤碳库特征及其对草地退化的响应

发布时间：2018-04-16 08:21

本文选题：群落类型 + 退化等级　；参考：《内蒙古大学》2017年硕士论文

【摘要】：生态系统碳固持研究是近年来生态学研究的热点领域,草地生态系统是陆地生态系统重要碳库之一。草地生态系统碳库主要集中于土壤中,而草地土壤碳库往往受群落类型、土壤环境背景及草地利用方式的影响。本文以内蒙古典型草原为例,通过测定不同草地群落土壤有机碳与无机碳含量与密度,揭示群落生物量、生物多样性及群落类型与土壤有机碳和无机碳库含量与密度相关关系,分析草地退化对土壤有机碳和无机碳的影响。研究结果表明:1.典型草原土壤有机碳含量与群落地上、地下及总生物量显著正相关,土壤有机碳密度与生物量相关性不显著;土壤总碳、土壤无机碳含量与密度和地上、地下生物量均无显著相关。2.群落多样性对土壤有机碳、无机碳及总碳含量与密度均无显著影响。3.典型草原不同群落类型之间土壤碳含量与密度差异较大,羊草群落有机碳含量及每cm 土壤深度密度介于7-11g/kg和1.02-1.35g/m2大针茅群落为10-13g/kg之间和1.38-1.52g/m2、克氏针茅群落为6.8-9.8g/kg之间和0.81-1.49g/m2、糙隐子群落+冷蒿群落为6-10g/kg和0.85-1.38g/m2、星毛委陵菜+冷蒿群落为6-7g/kg和0.9-1.17g/m2,相同群落土壤碳含量与密度具有明显的区域差异。4.草地退化对土壤碳库的影响较为复杂,极重度退化群落土壤有机碳含量与密度显著降低,其他退化等级群落降低不显著,表现出对退化的滞后效应。所有等级退化群落土壤无机碳含量与密度变化均不显著。
[Abstract]:Ecosystem carbon sequestration is a hot field of ecological research in recent years. Grassland ecosystem is one of the important carbon reservoirs in terrestrial ecosystem.The carbon pool of grassland ecosystem is mainly concentrated in soil, and the soil carbon pool of grassland is often affected by community type, soil environment background and grassland utilization mode.Taking the typical grassland of Inner Mongolia as an example, the content and density of soil organic carbon and inorganic carbon in different grassland communities were determined to reveal the relationship between the biomass, biodiversity and community type of the community and the content of soil organic carbon and inorganic carbon pool.The effects of grassland degradation on soil organic and inorganic carbon were analyzed.The results of the study show that 1: 1.Soil organic carbon content was positively correlated with community aboveground, underground and total biomass, soil organic carbon density had no significant correlation with biomass, soil total carbon, soil inorganic carbon content and density and aboveground.There was no significant correlation between below-ground biomass and below-ground biomass.Community diversity had no significant effect on soil organic carbon, inorganic carbon, total carbon content and density.The soil carbon content and density of typical steppe are different among different community types.The organic carbon content and depth density per cm soil of Leymus chinensis community are between 10-13g/kg and 1.38-1.52g / m ~ 2 in 7-11g/kg and 1.02-1.35g/m2 soil depth, 6.8-9.8g/kg and 0.81-1.49g / m ~ 2 in Stipa krjabini community, 6-10g/kg and 0.85-1.38g / m ~ 2 in codon community, and Artemisia frigida community in Potentilla orientalis community.For 6-7g/kg and 0.9-1.17g / m ~ 2, the soil carbon content and density of the same community were significantly different from each other.The effects of grassland degradation on soil carbon pool were complex. The soil organic carbon content and density of extremely severe degraded communities decreased significantly, while other degraded communities showed a lag effect on degradation.There was no significant change in soil inorganic carbon content and density in all grade degraded communities.
【学位授予单位】：内蒙古大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S812

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