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对西南山地阔叶林区的天然阔叶混交林、天然次生林和人工柳杉林的土壤表层有机碳(SSOC)进行了测定,并用地统计学理论构建了3种亚热带森林生态系统在小尺度上的SSOC半方差理论模型。结果表明,不同森林生态系统间SSOC含量差异性显著,表现为天然阔叶混交林>天然次生林>人工柳杉林,SSOC含量与土壤含水率、容重、孔隙度和有机质相关性显著;天然阔叶混交林的SSOC空间相关性最强,次生林次之,人工林较弱;天然阔叶混交林SSOC在45°方向上空间变异最明显,天然次生林和人工林在各个方向上的变异均较弱;天然阔叶混交林SSOC的等值线较密,梯度变化急剧,天然次生林次之,人工林等值线稀疏,梯度变化不明显。这表明不同森林类型对SSOC含量和分布有着重要影响。
The soil surface organic carbon (SSOC) in natural broad-leaved mixed forest, natural secondary forest and artificial Cryptomeria fortunei forest in the broad-leaved forest in the mountainous area of southwestern China were measured. Based on the statistical theory, three subtropical forest ecosystems were constructed on a small scale SSOC semi-variance theoretical model. The results showed that there was significant difference in SSOC content among different forest ecosystems, which showed that natural broadleaved mixed forest> natural secondary forest> artificial Cryptomeria fortunei forest. SSOC content was significantly correlated with soil moisture content, bulk density, porosity and organic matter; The spatial correlation of SSOC was the strongest in the forest, followed by the secondary forest and the plantation was weak. The SSOC of the natural broad-leaved mixed forest was the most obvious in the 45 ° direction. The variation of the natural secondary forest and the plantation in all directions was weaker. The SSOC of broad-leaved mixed forest is dense, the gradient changes sharply, followed by the natural secondary forest, the contour of plantation is sparse, and the gradient does not change obviously. This indicates that different forest types have a significant impact on SSOC content and distribution.