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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
(K), calcium (Ca), magnesium (Mg), sodium (Na), iron (Fe), manganese (Mn) and zinc (Zn) in spruce branch of spruce branche on different coastal gradients in Chishan forest farm of Dongshan, Elemental content and reabsorption rate.The results showed that the coastal gradient had a significant effect on the content and reabsorption rate of each element in the spruce branch of M. sphaerocephala.The K reabsorption rate was positive at each coast gradient , And the resorption rate of the trunk belt was significantly lower than that of other plots. The Fe and Zn were negative values. The reabsorption rates of Ca, Mg and Na were negative at the front of the shelterbelts. .This indicates that severe environmental stress in the dryland of Pinus koraiensis significantly reduces the nutrient reabsorption rate of Spruce branche epidermis.The K and Mg contents in mature branchlets of Spruce branche have a significant positive correlation with their resorption rates, There was a significant negative correlation between resorption rate and resorption rate of other elements, except for K, there was a significant negative correlation between the content of each element and the corresponding element reabsorption rate, The higher the degree of absorption, the higher the reabsorption rate.Ca, Mg, Na and Fe reabsorption rate between There was a significant positive correlation (P <0.01). Zn was negatively correlated with other elements except for Mn reuptake and Mn had no significant correlation with reabsorption of other elements. The different types of nutrients in the spruce branchlets have different effects on their resorption rates.