本文選題：群落類型 + 退化等級�。� 參考：《內(nèi)蒙古大學(xué)》2017年碩士論文

【摘要】：生態(tài)系統(tǒng)碳固持研究是近年來生態(tài)學(xué)研究的熱點領(lǐng)域,草地生態(tài)系統(tǒng)是陸地生態(tài)系統(tǒng)重要碳庫之一。草地生態(tài)系統(tǒng)碳庫主要集中于土壤中,而草地土壤碳庫往往受群落類型、土壤環(huán)境背景及草地利用方式的影響。本文以內(nèi)蒙古典型草原為例,通過測定不同草地群落土壤有機碳與無機碳含量與密度,揭示群落生物量、生物多樣性及群落類型與土壤有機碳和無機碳庫含量與密度相關(guān)關(guān)系,分析草地退化對土壤有機碳和無機碳的影響。研究結(jié)果表明:1.典型草原土壤有機碳含量與群落地上、地下及總生物量顯著正相關(guān),土壤有機碳密度與生物量相關(guān)性不顯著;土壤總碳、土壤無機碳含量與密度和地上、地下生物量均無顯著相關(guān)。2.群落多樣性對土壤有機碳、無機碳及總碳含量與密度均無顯著影響。3.典型草原不同群落類型之間土壤碳含量與密度差異較大,羊草群落有機碳含量及每cm 土壤深度密度介于7-11g/kg和1.02-1.35g/m2大針茅群落為10-13g/kg之間和1.38-1.52g/m2、克氏針茅群落為6.8-9.8g/kg之間和0.81-1.49g/m2、糙隱子群落+冷蒿群落為6-10g/kg和0.85-1.38g/m2、星毛委陵菜+冷蒿群落為6-7g/kg和0.9-1.17g/m2,相同群落土壤碳含量與密度具有明顯的區(qū)域差異。4.草地退化對土壤碳庫的影響較為復(fù)雜,極重度退化群落土壤有機碳含量與密度顯著降低,其他退化等級群落降低不顯著,表現(xiàn)出對退化的滯后效應(yīng)。所有等級退化群落土壤無機碳含量與密度變化均不顯著。
[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.
【學(xué)位授予單位】：內(nèi)蒙古大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：S812

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本文編號：1758077