高庙屯小流域土壤有机碳储量及空间分布特征研究

发布时间：2018-04-28 22:35

本文选题：土壤有机碳 + 碳储量　；参考：《北京林业大学》2015年硕士论文

【摘要】：土壤有机碳在缓和气候变化、改善土壤质量方面作用巨大。本文对延庆县高庙屯小流域内的土壤有机碳储量进行了估算,及对其空间分布进行了研究。本文根据土地利用类型,同时充分考虑地形因子在流域内选取土样点126个,其中101个取样点分0-20cm,20-40cm取样,获取土样样本202个,另外25个样点只取0-20cm层土壤(因山上土层平均厚度只有20cm)。对样本数据进行分析,结果表明：(1)流域内两层土壤深度土壤平均有机碳含量变异均为中等强度变异,表现出显著差异(P0.05),且与深度呈现负相关；两层土壤有机碳最优模型均为指数模型,具有很强的空间相关性；其空间分布基本呈现一致性。(2)质地对土壤有机碳含量有显著影响,0-20cm土壤层土壤有机碳与粘粒含量呈现极显著负相关(P0.01),而在20~40cm土壤层土壤有机碳与砂粒含量呈现显著负相关(P0.05)；与粉粒含量呈现显著正相关(P0.05)；地形因子中,坡度对土壤有机碳含量影响最大,往下依次是高程,坡向；两层土壤有机碳含量与其对应的含水量都呈现极显著相关关系(P0.01)；两层土壤中,土壤平均有机碳含量均为林地最大,0-20cm层中,林地与耕地、草地、园地有机碳含量差异显著(P0.05),而20-40cm层中林地只与园地土壤有机碳差异显著(P0.05)。(3)在众多土地利用类型中,林地的土壤有机碳密度为最大,因此,建议延庆县在土地规划整治时增加林地面积,以缓和大气中的二氧化碳,缓解温室效应。
[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.
【学位授予单位】：北京林业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S153.6

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