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P＜0.05显著水平下的回归方程分别为:Y=25.662 40+1.722 06X1-0.061 54X2(R2=0.853 5)(褐土); Y=24.890 95-3.437 45X1-0.002 12X2(R2=0.899 5)(栗钙土);Y=19.112 05-0.090 72X1-0.018 44X2(R2=0.794 4)(棕壤)。
Aohan Banner is located in the farming-pastoral ecotone in Chifeng City, Inner Mongolia, soil types are rich, the area of artificial afforestation is large, and the carbon balance situation of planted forests in various soil types is quite different. In this experiments 3 sample plots were selected from the 6 soil types separately, and 5 sample sites were determined along the S-shaped sample line in each sample plot so as to study the distribution of soil organic carbon density in Aohan Banner. The conclusions are as follows: The organic carbon density of cinnamon soil was the highest, and that of Aeolian sandy soil was the lowest. The change trends of soil organic carbon density of cinnamon soil, chestnut soil and brown soil were different due to the difference in soil properties, slopes and slope positions. The organic carbon density of these soils was the highest on north slope but the lowest on south slope. The results of principal component analysis on the soil organic carbon density revealed that the slope was not as the main ingredient. Through regression analysis, it was concluded that the regression equations of the organic carbon density of three types of soil at significance level of P<0.05 are as:Y=25.662 40+1.722 06X1-0.061 54X2(R2=0.853 5) for cinnamon soil, Y=24.890 95-3.437 45X1-0.002 12X2(R2=0.899 5) for chestnut soil, and Y=19.112 05-0.090 72X1-0.018 44X2(R2=0.794 4) for brown soil.
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