本文選題：土壤有機碳 + 碳儲量　； 參考：《北京林業(yè)大學》2015年碩士論文

【摘要】：土壤有機碳在緩和氣候變化、改善土壤質(zhì)量方面作用巨大。本文對延慶縣高廟屯小流域內(nèi)的土壤有機碳儲量進行了估算,及對其空間分布進行了研究。本文根據(jù)土地利用類型,同時充分考慮地形因子在流域內(nèi)選取土樣點126個,其中101個取樣點分0-20cm,20-40cm取樣,獲取土樣樣本202個,另外25個樣點只取0-20cm層土壤(因山上土層平均厚度只有20cm)。對樣本數(shù)據(jù)進行分析,結(jié)果表明：(1)流域內(nèi)兩層土壤深度土壤平均有機碳含量變異均為中等強度變異,表現(xiàn)出顯著差異(P0.05),且與深度呈現(xiàn)負相關(guān)；兩層土壤有機碳最優(yōu)模型均為指數(shù)模型,具有很強的空間相關(guān)性；其空間分布基本呈現(xiàn)一致性。(2)質(zhì)地對土壤有機碳含量有顯著影響,0-20cm土壤層土壤有機碳與粘粒含量呈現(xiàn)極顯著負相關(guān)(P0.01),而在20~40cm土壤層土壤有機碳與砂粒含量呈現(xiàn)顯著負相關(guān)(P0.05)；與粉粒含量呈現(xiàn)顯著正相關(guān)(P0.05)；地形因子中,坡度對土壤有機碳含量影響最大,往下依次是高程,坡向；兩層土壤有機碳含量與其對應(yīng)的含水量都呈現(xiàn)極顯著相關(guān)關(guān)系(P0.01)；兩層土壤中,土壤平均有機碳含量均為林地最大,0-20cm層中,林地與耕地、草地、園地有機碳含量差異顯著(P0.05),而20-40cm層中林地只與園地土壤有機碳差異顯著(P0.05)。(3)在眾多土地利用類型中,林地的土壤有機碳密度為最大,因此,建議延慶縣在土地規(guī)劃整治時增加林地面積,以緩和大氣中的二氧化碳,緩解溫室效應(yīng)。
[Abstract]:Soil organic carbon plays an important role in mitigating climate change and improving soil quality. In this paper, the soil organic carbon storage in Gaomiaotun small watershed of Yanqing County was estimated and its spatial distribution was studied. According to the type of land use, 126 soil samples were selected in this paper according to the topographic factors, among which 101 sampling points were divided into 0-20 cm ~ 40 cm sampling, and 202 soil samples were obtained. The other 25 samples only take 0-20cm layer soil (because the average thickness of the mountain soil layer is only 20 cm ~ (-1)). The analysis of the sample data showed that the variation of soil average organic carbon content in the two layers of soil depth was medium intensity variation, which showed significant difference (P0.05N), and was negatively correlated with the depth. The two soil organic carbon optimal models are exponential models with strong spatial correlation. The spatial distribution of soil organic carbon has significant influence on soil organic carbon content in 0-20cm soil layer. There is a significant negative correlation between soil organic carbon and clay content (P0.01N), but in 20~40cm soil layer, soil organic carbon and sand content show significant negative correlation. There was a significant positive correlation between P0.05 and the content of silt, and there was a significant positive correlation between P0.05 and the content of silt. The slope had the greatest influence on the soil organic carbon content, which followed by elevation and slope direction, and the soil organic carbon content in the two layers had a significant correlation with its corresponding water content (P 0.01), while in the two layers of soil, there was a significant correlation between the soil organic carbon content and the corresponding water content. The average organic carbon content of soil was the largest in 0-20 cm layer of forest land, and the difference between forest land and cultivated land, grassland, garden land was significant (P 0.05), while in 20-40cm layer there was only significant difference between forest land and garden soil organic carbon (P 0.05 ~ (3) among many land use types, there were significant differences in soil organic carbon content between forest land and garden land (P < 0.05). The soil organic carbon density of forest land is the highest, so it is suggested that Yanqing county increase the area of forest land in order to ease the carbon dioxide in the atmosphere and alleviate the Greenhouse Effect.
【學位授予單位】：北京林業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：S153.6

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