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Chinese Academy of Forestry (2013)

Study on the Influence of the Rocky Desertification on Soil Carbon Pool and Soil Carbon Emissions

Guo Hong Yan

Titre : Study on the Influence of the Rocky Desertification on Soil Carbon Pool and Soil Carbon Emissions

Auteur : Guo Hong Yan

Grade : Doctoral Dissertation 2013

Université : Chinese Academy of Forestry

Résumé partiel
The soil play a key role in the global carbon balance, while the soil carbon is sensitive tothe land use change. The paper addresses the scientific question that how the land degradationand the decreasing of the quality of soil will influence the soil carbon emissions, which wascaused by the rocky desertification in the Karst region of southwest China. We selectedmonitoring plots include Not rocky desertification land(Non-rocky desertification land andpotential rocky desertification land) and desertification land(slight, middle,serious,significantslight) in the typical rocky desertification management area Huajiang karst gorge in Guanlingcounty of Guizhou province. We measured the soil organic carbon and soil inorganic carbon inthe not rocky desertification land and rocky desertification land and used the Li-8100automated soil CO2flux system to monitor the seasonal variations of soil respiration from2012-2013in the fields, We used test specimens made from lithology rocky to monitor thecorrosive rate,to study the influence of Karst process on the soil carbon pool and soil carbonemissions. Through the monitor data analysis of the area and degrees of rocky desertificationland of Guanling County before and after the rocky desertification management. The influenceon the soil carbon pool and soil carbon emissions by rocky desertification management wasevaluated quantitatively. The main results are as follows :(1)Soil organic carbon content : the soil organic carbon content of Non-rockydesertification land is higher than that of potential rocky desertification land, among rockydesertification land, the soil organic carbon content of serious and significant serious rockydesertification land are higher than that of the slight rocky desertification land ; the soil organiccarbon content of Not rocky desertification land is higher than that of rocky desertificationland.In non-Rocky desertification land, the soil inorganic carbon density of grass land was thelargest, which was two times of shrub land and five times of bare land. It indicate that the soilinorganic carbon density had a great relevance with the surface vegetation types. In the potential-Rocky desertification land, the soil inorganic carbon density was lower than that ofnon-Rocky desertification land. In the Rocky-desertification land, the soil inorganic carbondensity was the lowest.

Mots clés : soil carbon pool soil respiration influence factor Karst process Rockydesertification management Guanling county

Présentation (Dissertation topics)

Page publiée le 11 avril 2014, mise à jour le 10 janvier 2018