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OALib Journal期刊
ISSN: 2333-9721
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桂西北喀斯特地区3种灌木群落土壤有机层特征
DOI: 10.3724/SP.J.1145.2009.00448, PP. 448-452
Keywords: 喀斯特,灌木群落,土壤有机层,表土层
Abstract:
研究了桂西北喀斯特地区植被自然恢复过程中分别处于不同演替阶段的3种灌木群落土壤有机层(ol)与表层土壤(表土，ts)的基本物理与化学特征.结果表明：(1)有机层干物质现存量为乔灌丛(5478.96kghm-2)>藤刺灌丛(4538.99kghm-2)>灌丛(3665.37kghm-2)；有机层与表土含水量分别为乔灌丛>藤刺灌丛>灌丛、乔灌丛>灌丛>藤刺灌丛.(2)总有机碳(toc)、全氮(tn)在有机层中的含量基本为未分解层>分解层，全磷(tp)、全钾(tk)则相反；有机层的tn、tp释放回归速率主要受到凋落物质量的限制，而环境因素的影响相对次要；p素的回归周期最长，是养分归还的限制因素.(3)有机层中的tn贮量依演替阶段从低到高而降低，tp与tk贮量群落间相差不大，但表土与有机层中的养分库格局规律并不一致，在表土中层各养分元素贮量基本上均以乔灌丛最高，即随着群落的正向演替，养分在土壤中的累积基本呈增加的趋势.图1表3参25
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