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OALib Journal期刊
ISSN: 2333-9721
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不同海岸梯度上短枝木麻黄小枝金属元素含量及其再吸收率动态
DOI: 10.3724/SP.J.1145.2011.00645, PP. 645-650
Keywords: 海岸梯度,短枝木麻黄,金属元素,养分再吸收率
Abstract:
对福建东山赤山林场不同海岸梯度上短枝木麻黄小枝中的钾（k）、钙（ca）、镁（mg）、钠（na）、铁（fe）、锰（mn）和锌（zn）元素含量及其再吸收率动态进行了研究.结果表明，海岸梯度对短枝木麻黄小枝中各元素含量及其再吸收率均具有显著影响.在各海岸梯度上，k再吸收率为正值，且基干林带的再吸收率显著低于其它样地，fe和zn为负值，ca、mg和na再吸收率在防护林带前沿为负值，而在后沿林为正值，mn则相反.这表明，基干林带严重的环境胁迫显著降低了短枝木麻黄小枝的养分再吸收率.短枝木麻黄成熟小枝中的k、mg含量与其再吸收率存在显著正相关，而na和fe与其再吸收率存在显著负相关，其它元素与其再吸收率之间没有显著相关性.除k外，各元素在衰老小枝中的含量与相应元素再吸收率之间均存在显著负相关，表明元素再吸收程度越高，其再吸收率就越高.ca、mg、na和fe再吸收率之间具有显著的正相关关系（p<0.01），zn除与mn再吸收率呈显著正相关外，与其它元素均表现为负相关，mn则与其它元素再吸收率之间没有显著相关性.因而短枝木麻黄小枝中不同类型的养分状况对其再吸收率具有不同的影响.表5参42
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