热带海岸典型森林类型土壤有机碳储量和碳氮垂直分布特征

发布时间：2018-11-10 17:30

【摘要】：热带海岸森林是重要的碳库,很容易受到人类活动的干扰,包括森林砍伐和气候变化。因此,迫切需要探明森林土壤有机碳储量,为热带海岸森林的保护和恢复提供理论依据。以热带海岸4种典型森林类型为研究对象,研究土壤中有机碳和全氮垂直分布特征及其与其他土壤理化性状关系。结果表明:不同林型土壤有机碳和全氮在土壤剖面中的垂直变化规律一致,表层含量较高,随着剖面深度增加含量逐渐降低,且不同土壤层次间呈现显著性差异。不同森林类型土壤有机碳和全氮含量平均值分别为1.35~7.06、0.08~0.61 g/kg,其中椰子人工林的土壤有机碳和全氮含量平均值最高,分别为7.06、0.61 g/kg,其次是香蒲桃天然次生林(6.07、0.44 g/kg)。各森林类型土壤碳氮比平均值依次为大叶相思人工林㧐木麻黄人工林㧐香蒲桃天然次生林㧐椰子人工林。各森林类型0~100 cm土层土壤有机碳储量从大到小依次为椰子人工林、香蒲桃天然次生林、大叶相思人工林和木麻黄人工林。相关分析结果表明,各个森林类型土壤有机碳与土壤容重呈显著负相关,与全氮呈显著正相关。说明椰子人工林和香蒲桃天然次生林森林生态系统达到平衡稳定状态,其碳汇效益较木麻黄人工林和大叶相思人工林显著,对热带海岸森林生态系统健康的经营与维护具有重要意义。
[Abstract]:Tropical coastal forests are important carbon pools that are vulnerable to human disruptions, including deforestation and climate change. Therefore, there is an urgent need to prove the forest soil organic carbon reserves, to provide a theoretical basis for the protection and restoration of tropical coastal forests. The vertical distribution characteristics of organic carbon and total nitrogen in soil and their relationship with other soil physical and chemical properties were studied with four typical forest types in tropical coast. The results showed that the vertical variation of soil organic carbon and total nitrogen in different forest types was the same, the content of surface layer was higher, and the content of organic carbon and total nitrogen gradually decreased with the increase of depth of profile, and there were significant differences among different soil layers. The average values of soil organic carbon and total nitrogen content in different forest types were 1.35 ~ 7.06 ~ 0.08 ~ (0.08) g / kg, respectively. The average value of soil organic carbon and total nitrogen content in coconut plantation was 7.06 ~ 0.61 g / kg, respectively, and the average value of soil organic carbon and total nitrogen content in different forest types was 7.06 ~ 0.61 g 路kg ~ (-1), respectively. The second was natural secondary forest (6.07 g/kg). The average value of soil C / N ratio of different forest types is acacia macrophylla plantation in order? Casuarina equisetifolia plantation? Natural secondary forest of Bergamot? Coconut plantations. The order of soil organic carbon storage of 0 ~ 100 cm soil layer is coconut plantation, natural secondary forest, Acacia macrophylla plantation and Casuarina equisetifolia plantation. The results of correlation analysis showed that soil organic carbon was negatively correlated with soil bulk density and positively correlated with total nitrogen in all forest types. The results showed that the forest ecosystem of coconut plantation and natural secondary forest was stable, and the benefit of carbon sink was more significant than that of Casuarina equisetifolia plantation and Acacia macrophylla plantation. It is of great significance for the healthy management and maintenance of tropical coastal forest ecosystem.
【作者单位】：海南省林业科学研究所;中国热带农业科学院环境与植物保护研究所;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) 海南省森林资源数据库建设标准研究(No.KYYS-2013-46) 基于小光斑激光雷达(LiDAR)和极化合成孔径雷达(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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