Characteristics of soil profile and organic carbon density amongsuccession stages in the evergreen broadleaved forestsof Tiantong region, Zhejiang province （Chinese）
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摘要: 选择浙江天童常绿阔叶林次生演替的四个主要阶段：灌草丛、马尾松林、木荷林与栲树林，研究其土壤剖面特征和碳密度的变化规律.结果显示：(1) 随演替进行，演替后期土壤机械组成的细颗粒比例增加，土壤容重显著降低，pH值略有降低（但不显著），有机质含量显著增加，10~20 cm层含水率显著增加；(2) 碳密度在演替前期和后期高于演替中期，而在剖面中间层（10~20 cm）最低；(3) 土壤细颗粒比例与含水率显著正相关，与土壤容重显著负相关，土壤有机质与碳密度显著正相关（0.01）.可以认为,随着常绿阔叶林次生演替进行，土壤剖面理化性质明显改善.Abstract: The main successional stages including grassland, Pinus massoniana dominated forests, Schima superba dominated forests and Castanopsis fargesii dominated forests in the Tiantong region, were selected to examine temporal trends of soil profile and carbon density. The results showed: (1) soil physical and chemical properties exhibited contrasting temporal patterns, with proportion of soil particulates, soil organic matter and soil moisture (10~20 cm) displaying a gradual increasing trends through succession, and with soil pH and soil bulk density generally decreasing with time; (2) soil carbon density was the lowest in the intermediate layer (10~20 cm) along soil profile, and was “Ushaped” through succession; and (3) among soil properties, proportion of soil particulates was positively correlated with soil moisture and negatively correlated with soil bulk density; soil organic carbon positively correlated with soil carbon density. It is concluded that soil physical and chemical properties substantially improve during secondary succession of evergreen broadleaved forests.
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