热带海岸防护林土壤活性有机碳分布特征:人工林与天然次生林的比较

发布时间：2018-07-17 00:24

【摘要】：本研究旨在比较热带海岸天然次生林与人工林土壤活性有机碳的差异,从而提高沿海防护林土壤有机碳库的存储能力和维持土壤碳平衡提供理论依据。选取海南岛沿海防护林中典型的2种人工林和2种天然次生林作为研究对象,通过测定土壤活性有机碳及养分含量,对热带海岸天然次生林与人工林土壤有机碳的积累能力及土壤养分与有机碳相关性的差异进行分析。结果表明:(1)该研究区4种林分土壤总有机碳、轻组有机碳和易氧化有机碳均表现为琼崖海棠天然次生林香蒲桃天然次生林大叶相思人工林木麻黄人工林;(2)4种林分土壤轻组有机碳占总有机碳比例以天然次生林最高,而人工林则具有更低的轻组有机碳分配比例;反之,人工林的土壤易氧化有机碳占总有机碳比例显著高于天然次生林;(3)4种林分的土壤活性有机碳与土壤全氮、土壤容重相关性显著,此外,2种人工林林地土壤活性有机碳与土壤含水量、pH、碳氮比同样具有相关性。相关性分析结果表明,人工林土壤活性有机碳与土壤各因子的相关性较天然次生林更为密切。这说明热带海岸林地土壤碳含量总体较低,与人工林相比,天然次生林土壤有机碳具有较大稳定性。
[Abstract]:The purpose of this study was to compare the difference of soil active organic carbon between natural secondary forest and artificial forest in tropical coast, so as to improve the storage capacity of soil organic carbon pool and maintain soil carbon balance in coastal shelterbelt. Two typical artificial forests and two natural secondary forests in the coastal shelterbelt of Hainan Island were selected as the research objects, and the soil active organic carbon and nutrient contents were measured. The ability of soil organic carbon accumulation and the correlation between soil nutrients and organic carbon of natural secondary forest and artificial forest on tropical coast were analyzed. The results showed that: (1) soil total organic carbon (TOC) of 4 stands in the study area, Both light group organic carbon and easily oxidized organic carbon were the natural secondary forest of Haitang Qiongya, the natural secondary forest of Acacia macrophylla, Casuarina equisetifolia plantation, (2) the proportion of soil organic carbon of light group to total organic carbon was the highest in natural secondary forest. On the contrary, the proportion of total organic carbon in soil easily oxidized in artificial forest was significantly higher than that in natural secondary forest; (3) soil active organic carbon and soil total nitrogen in 4 kinds of forest were significantly higher than those in natural secondary forest. The correlation of soil bulk density was significant, in addition, soil active organic carbon and pH value of soil moisture and ratio of carbon to nitrogen were also correlated in two kinds of plantations. The results of correlation analysis showed that the correlation between soil active organic carbon and soil factors in plantation was more close than that in natural secondary forest. The results showed that the soil carbon content of tropical coastal forest was lower than that of artificial forest, and the soil organic carbon of natural secondary forest was more stable than that of artificial forest.
【作者单位】：海南省林业科学研究所;海南大学环境与植物保护学院;
【基金】：海南省热带林碳汇参数及模型研究(No.KYYS-2015-18) 极化合成孔径雷达(SAR)的热带森林生物量碳储量反演(No.KYYS-2016-22)
【分类号】：S714.2

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