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。
Abstract
The soil labile carbon is one of the important components of the global carbon cycle. The variations of soil total organic carbon(TOC), water soluble organic carbon(WSOC), readily oxidation carbon (ROC)and their correlations with basic physicochemical properties at four plantations were examined in south area of Jiangsu province. Our results showed that the soil TOC concentration ranged in order as follow: Quercus acutissima>Cunninghamia lanceolata>Phyllostachys pubescens>Pinus elliottii. The soil WSOC concentration ranged in order as follow: Ph. pubescens>C. lanceolate>P. elliottii>Q. acutissima. The soil ROC concentration ranged as follow: Q. acutissima>Ph. pubescens>C. lanceolata>P. elliottii. The WSOC/TOC, ROC/TOC ratios were varied. There was significantly correlation among AOC(WSOC & ROC)and TOC, TN, respectively. Meanwhile, there was no significantly correlation between AOC and other soil basic physicochemical properties. Our study indicated that the soil organic carbon of broadleaved plantations was higher than that in the coniferous plantations, and Ph. pubescens might play an important role in carbon cycling of forest ecosystems. However, the stabilization of soil carbon storage of them did not obvious different.
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基金
收稿日期:2011-10-17 修回日期:2012-04-12 基金项目:国家林业公益性行业科研专项项目(200804006,201104006) 第一作者:李平,硕士生。*通信作者:阮宏华,教授。E-mail: hhruan1690@njfu.edu.cn。引文格式:李平,王国兵,郑阿宝,等. 苏南丘陵区4种典型人工林土壤活性有机碳分布特征[J]. 南京林业大学学报:自然科学版 ,2012,36(4):79-83.
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