普定后寨河流域土壤有机碳储量估算

发布时间：2018-05-27 04:41

本文选题：空间异质性 + 土壤有机碳储量　；参考：《贵州大学》2015年硕士论文

【摘要】：按照样带法原理在贵州省普定县后寨河流域的上游、中游、下游分别布设典型的土壤样品采集条带,每个采样条带内均设置6个平行样带,采样条带为南北走向,由北向南贯穿流域边界,采样条带内的采样单元为150×150m~2的方形网格,采样点位于采样单元方形网格的中心。通过在采样点处挖掘土壤剖面,分层均匀带状采集土壤样品,测定了土壤有机碳含量、土壤容重,同时测定土壤厚度、土壤分布面积和岩石裸露率等指标,调查统计采样单元内的本地信息,通过分析相关试验数据,探讨了后寨河流域空间异质性问题和土壤有机碳储量估算问题。结果表明:1、后寨河流域的空间异质性(1)后寨河流域内地形地貌在上游、中游和下游的空间分布格局差异较大,且岩性、土壤、植被、土地利用类型和岩石裸露率等在流域内上游、中游和下游的空间变异性也较大。(2)后寨河流域内每个采样单元内的空间分布格局极其复杂,土壤有机碳含量在不同坡位、坡向、坡度、小生境和土地利用类型下空间变异性均较大。(3)每个采样点土壤剖面的空间变异性较大,不同土属土壤剖面的层次划分、厚度、石砾含量、结构、质地和根系等差异较大。2、后寨河流域有机碳储量估算(1)土壤有机碳含量、土壤厚度、土壤容重、岩石裸露率等指标的空间变异性较大,其对土壤有机碳储量估算的影响程度关系为土壤有机碳含量岩石裸露率土壤厚度土壤容重。(2)后寨河流域空间异质性较高,估算土壤有机碳储量时需优化计算公式和计算模式,应以“水平分类+垂直分层”模式进行估算。(3)估算后寨河流域土壤有机碳储量时,不同估算方法估算的结果存在一定的差异。通过修正后的计算公式以“土壤类型法”估算出普定后寨河流域土壤有机碳储量为7.24×105t,表层20cm厚土壤有机碳密度区间为3.53~9.11kg/m~2,100cm以内土壤有机碳密度区间为9.11~14.68kg/m~2。
[Abstract]:According to the principle of transect method, typical soil sampling strips were arranged in the upper, middle and lower reaches of Houzhai River basin in Puding County, Guizhou Province. The sampling unit in the sampling strip is a square mesh of 150 脳 150m~2, and the sampling point is located at the center of the square grid of the sampling unit. Soil samples were collected by digging soil profile at sampling points, and soil organic carbon content, soil bulk density, soil thickness, soil distribution area and rock exposure rate were measured. Based on the investigation of the local information in the sampling unit, the spatial heterogeneity and the estimation of soil organic carbon reserves in Houzhai River Basin were discussed by analyzing the relevant experimental data. The results showed that the spatial heterogeneity of the river basin in Houzhai River Basin was different from that in the upper, middle and lower reaches, and the lithology, soil and vegetation of the basin were different. The spatial variability of land use type and rock exposure rate in the upper, middle and lower reaches of the basin is also large.) the spatial distribution pattern of each sampling unit in the Zhai River basin is extremely complex, and the soil organic carbon content is in different slope position and slope direction. The spatial variability of soil profile in each sampling point is higher than that in different soil profile. The soil profile of different soil genera is divided into layers, thickness, gravel content and structure. There were significant differences in texture and root system. 2. The spatial variability of soil organic carbon content, soil thickness, soil bulk density, rock exposure rate and so on in Houzhai River Basin was higher than that in Huizhai River Basin. The degree of influence on the estimation of soil organic carbon reserves is that the soil organic carbon content, rock exposure rate, soil thickness, soil bulk density and soil heterogeneity are higher in the Zhai River Basin, and the calculation formula and calculation model should be optimized when estimating the soil organic carbon reserves. When the soil organic carbon reserves in Houzhai River Basin are estimated by "horizontal classification and vertical stratification" model, there are some differences in the results of different estimation methods. The soil organic carbon storage in Puding Houzhai River basin was estimated by "soil type method" by the modified formula. The soil organic carbon density range of surface 20cm thick soil was 7.24 脳 10 ~ 5 t, and that of surface 20cm thick soil was 9.11 ~ 14.68 kg 路m ~ (2) 路m ~ (2) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1).
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S153.6

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