Nutrient conservation strategies of a mangrove species Rhizophora stylosa under nutrient limitation
Nutrient conservation strategies of a mangrove species Rhizophora stylosa under nutrient limitation
复制标题
DOI：
10.1007/s11104-009-0026-x
复制
发表时间：
2010-01-01
期刊：
影响因子：
4.9
通讯作者：
Lin, Guang-Hui
中科院分区：
文献类型：
--
作者：
Lin, Yi-Ming;Liu, Xiao-Wei;Lin, Guang-Hui
尽管越来越多的知识营养限制的红树林物种和红树林如何适应低养分，有很少的信息，相对重要性的N：P比和叶酚类物质的变化，在确定养分保护。在这项研究中，我们评估了可能的养分保护策略的红树林红海榄在养分限制。1.叶片营养元素含量的变化趋势是：红海榄成熟叶和衰老叶的N浓度均以冬季最高，P浓度均以春季最高。叶片N、P含量在衰老过程中显著下降。根据氮磷比R.红海榄林为N限制林。因此，氮再吸收效率（NRE）显著高于磷再吸收效率（PRE）。花柱叶在叶衰老期间。NRE和PRE均在秋季达到最高值。衰老叶片中N、P平均含量分别为0.15%和0.06%。氮吸收效率（NRP）与氮吸收效率（NRE）呈显著负相关，磷吸收效率（PRP）与磷吸收效率（PRE）呈极显著正相关。2. R.红海榄叶单宁含量较高。总酚、可提取缩合单宁和总缩合单宁含量在叶片衰老过程中呈上升趋势，并随季节变化。总酚、可提取缩合单宁和总缩合单宁的浓度均出现在夏季，总酚浓度与氮、磷浓度呈负相关。3.我们的研究结果证实，叶片衰老过程中的再吸收效率取决于类型的养分限制，和NRE是远远高于PRE在氮限制条件下。R.海鞘林在潮间带海岸环境中发展了几种营养物保护策略，包括高氮吸收效率、低营养物损失和高单宁水平。
Despite a growing knowledge of nutrient limitation for mangrove species and how mangroves adapt to low nutrients, there is scant information about the relative importance of N:P ratio and leaf phenolics variability in determining nutrient conservation. In this study, we evaluated possible nutrient conservation strategies of a mangrove Rhizophora stylosa under nutrient limitation. 1. The leaf nutrient concentrations of R. stylosa changed with season, with the highest N concentration in winter and the highest P concentration in spring for both mature and senescent leaves. Leaf N and P concentrations decreased significantly during leaf senescence. Based on N:P ratios R. stylosa forest was N-limited. Accordingly, the nitrogen resorption efficiency (NRE) was significantly higher than phosphorus resorption efficiency (PRE) for the R. stylosa leaves during leaf senescence. The NRE and PRE both reached the highest in the autumn. Average N and P concentrations in the senescent leaves were 0.15% and 0.06% for R. stylosa, respectively, indicating a complete resorption of N and an incomplete resorption of P. There was a significant negative correlation between nitrogen resorption proficiency (NRP) and NRE, meanwhile phosphorus resorption proficiency (PRP) and PRE correlation was also highly significantly. 2. R. stylosa leaves contained relatively high tannin level. Total phenolics, extractable condensed tannins and total condensed tannins contents increased during leaf senescence, and changed between seasons. The lowest concentrations of total phenolics, extractable condensed tannins and total condensed tannins occurred in summer, total phenolics concentrations were inversely related to nitrogen or phosphorus concentrations. 3. Our results confirmed that resorption efficiency during leaf senescence depends on the type of nutrient limitation, and NRE was much higher than PRE under N-limited conditions. R. stylosa forest developed several nutrient conservation strategies in the intertidal coastline surroundings, including high nitrogen resorption efficiency, low nutrient losses and high tannins level.