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人工林土壤碳循环是全球碳循环研究的重要内容之一。笔者对江苏苏南丘陵地区4种典型人工林土壤总有机碳、水溶性有机碳、易氧化碳的差异及其与土壤基本理化性质的关系进行了比较研究,结果表明:各林分土壤总有机碳含量从大到小顺序为麻栎林、杉木林、毛竹林、湿地松林;土壤水溶性有机碳含量从大到小顺序为毛竹林、杉木林、湿地松林、麻栎林;土壤易氧化碳含量从大到小顺序为麻栎林、毛竹林、杉木林、湿地松林。两种活性有机碳占总有机碳比例在4种林分类型中没有表现出一致的规律性。土壤活性有机碳与土壤总有机碳、全氮有显著的相关关系,与其他土壤基本理化性质相关关系不显著。4种人工林土壤碳库贮量为阔叶林高于针叶林,毛竹林也占有重要地位,但土壤碳库的稳定程度没有表现出明显差异。
Soil carbon cycling in plantations is one of the important parts of the global carbon cycle research. The authors compared the differences of soil total organic carbon, water-soluble organic carbon and easily oxidizable carbon and their relationship with soil physical and chemical properties of four typical plantations in the southern Jiangsu hilly region. The results showed that the soil total organic The order of carbon content was Maqu forest, Cunninghamia lanceolata forest, Phyllostachys pubescens forest and Pinus elliottii forest, and the order of soil water-soluble organic carbon was Moso bamboo, Cunninghamia lanceolata forest, Pinus elliottii forest and Quercus mongolica forest in ascending order; The descending order of content is Quercus mongolica, Moso bamboo, Cunninghamia lanceolata and Pinus elliottii. The two types of active organic carbon as a percentage of total organic carbon did not show consistent regularity among the four stand types. Soil active organic carbon had significant correlation with soil total organic carbon and total nitrogen, and had no significant correlation with other soil physical and chemical properties. The soil carbon stock and storage capacity of four kinds of plantations were higher in the broad-leaved forests than in the coniferous forests, and the bamboo forests also played an important role. However, the stability of the soil carbon stocks showed no significant difference.