不同类型土壤的有机碳密度特征

发布时间：2018-01-17 12:36

本文关键词：不同类型土壤的有机碳密度特征　出处：《干旱区研究》2016年03期 　论文类型：期刊论文

【摘要】：赤峰市敖汉旗地处农牧交错带,土壤类型丰富,且人工造林面积较大,各类型土壤不同人工林的碳收支情况有很大差异。本试验在敖汉旗6种类型土壤上各选取3块样地,在所有样方内按"S"型选取5个采样点,以此来研究敖汉旗不同类型土壤有机碳密度分布特征。结果表明:6种类型土壤的有机碳密度为褐土最大,风沙土最小。由于土壤自身性质与坡度和坡位的相互影响,褐土、栗钙土、棕壤的有机碳密度呈现不同的变化趋势。褐土、栗钙土、棕壤有机碳密度均为北坡最大,南坡最小。主成分分析结果显示坡位、坡面和坡度3因素中坡面不作为主成分保留,经回归分析,褐土、栗钙土、棕壤的有机碳密度在P0.05显著水平下的回归方程分别为:Y=25.662 40+1.722 06X_1-0.061 54X_2(R~2=0.853 5)(褐土);Y=24.890 95-3.437 45X_1-0.002 12X_2(R~2=0.899 5)(栗钙土);Y=19.112 05-0.090 72_X1-0.018 44X_2(R~2=0.794 4)(棕壤)。
[Abstract]:Aohan Banner of Chifeng City is located in the ecotone of agriculture and animal husbandry. The soil type is rich and the area of artificial afforestation is large. The carbon budget of different plantations in different types of soil was very different. In this experiment, 3 plots were selected on 6 types of soils in Aohan Banner, and 5 sampling sites were selected according to "S" type in all plots. The distribution characteristics of organic carbon density in different soil types of Aohan flag were studied. The results showed that the organic carbon density of 6 types of soil was the largest in cinnamon soil. The organic carbon density of cinnamon soil, chestnut soil and brown soil showed different trends due to the interaction of soil properties with slope and slope position. Cinnamon soil, chestnut soil. The organic carbon density of brown soil was the largest in the north slope and the lowest in the south slope. The results of principal component analysis showed that the slope surface was not retained as the principal component in the slope position, slope surface and slope gradient, and the regression analysis showed that the cinnamon soil and chestnut soil were not retained. The regression equation of organic carbon density of brown soil at P0.05 significant level is: 1 Y25.662 40 1.722 06X-1 0.061 54X2 (P < 0.05). RX2 + 0. 853 5 (Thunb); YT 24.890 95-3.437 45X1-0.00212XS _ 2 / R ~ (2 +) 0.899 ~ 5 (chestnut chestnut soil) _ _ _. YT 19.112 05-0.090 72L X1-0.018 44XS-1, RX 22.794 4 (brown soil).
【作者单位】：内蒙古农业大学;丹东市林业局;
【基金】：内蒙古应用研究与开发计划项目“农林牧耦合生态系统固碳关键技术”(2010732) 中国科学院战略性先导科技专项“京津风沙源治理工程(内蒙片)固碳速率和潜力研究”(XDA05060602)资助
【分类号】：S153.6
【正文快照】： 土壤碳库是全球最重要的碳库之一,全球土壤碳库是陆地植被碳库的2~3倍,是全球大气碳库的2倍多〔1〕。森林具有吸收、固定大气中CO2的功能,是陆地生态系统最大的碳库,森林生物量的碳储量占全球植被的77%,而森林土壤的碳储量约占全球土壤的39%,因此,森林生态系统在整个碳循环中

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