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应用与环境生物学报 2015

亚热带常绿阔叶林凋落叶分解过程中氮和磷在不同雨热季节的释放动态

DOI: 10.3724/SP.J.1145.2014.10008, PP. 308-315

马志良,高顺,杨万勤,吴福忠

Keywords: 季节性降雨,亚热带常绿阔叶林,凋落叶分解,养分释放

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Abstract:

为理解植物―土壤之间的养分联系，采用凋落物分解袋法，研究季节性降雨期间常绿阔叶林区最具代表性的马尾松（pinusmassoniana）、柳杉（cryptomeriafortunei）、杉木（cunninghamialanceolata）、香樟（cinnamomumcamphora）、红椿（toonaciliata）、麻栎（quercusacutissima）等6种凋落叶第一年不同雨热季节分解中氮（n）、磷（p）动态及释放与富集特征.结果显示，凋落叶的n浓度随雨季的变化动态取决于树种，但除红椿以外的其它5种凋落叶在分解初期n浓度变化不明显，在雨季时期显著升高（p<0.05）；6种凋落叶p浓度动态比较一致，表现为分解初期p浓度稍微下降，在雨季时期显著升高（p<0.05）.历经一年的分解，红椿n、p释放率最大（分别为81.79%、54.19%），香樟n富集率最大（131.45%），马尾松的p富集率最高（268.75%），且6种凋落叶n、p释放/富集率动态均在雨季最明显.凋落叶分解过程中c/n、c/p呈现下降趋势，而n/p变化规律不一致.这些结果均表明，季节性降雨显著（p<0.05）影响凋落叶n、p动态，雨季温湿度的改变可影响n、p释放过程.

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