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OALib Journal期刊
ISSN: 2333-9721
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中国森林凋落叶n、p化学计量特征及控制因素
DOI: 10.3724/SP.J.1145.2014.10040, PP. 316-322
Keywords: 凋落叶,化学计量比,地理因素,气候因素,叶特性
Abstract:
建立中国森林凋落叶养分浓度及其化学计量比数据库，分析养分浓度及其化学计量比与主要环境因素之间的关系，对预测中国森林生态系统生物地球化学循环具有重要意义.通过收集已报道的中国森林凋落叶氮（n）、磷（p）浓度及其相关变量，探讨地理因素（纬度，lat）、气候因素（年平均气温，mat和年平均降水量，map）和叶特性（常绿与落叶、阔叶与针叶）对中国森林凋落叶n、p和n/p的影响.结果显示，n浓度和n/p随lat的升高而降低，p浓度随lat的升高而升高；n浓度和n/p随mat和map的升高而升高，而p浓度随mat和map的升高而降低；常绿树种和落叶树种n浓度差异不显著，落叶树种p浓度比常绿树种高53%，而n/p比常绿树种低57%；相反，阔叶树种n浓度比针叶树种的高37%，而p浓度和n/p在两者之间没有显著差异.综上，中国森林凋落叶n、p及n/p受环境因素和叶特性综合影响，特别是气候因素对凋落叶p浓度和n/p的影响尤为显著，这为预测全球气候变暖背景下森林物质循环提供了理论依据.
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