Nutrient resorption of Kandelia obovata in response to nutrient enrichment

The impact of nutrient increase on nutrient resorption from senescent leaves is an important topic, which is not completely understood. Mangrove species are characterized by nutrient conservation mechanisms as a consequence of adaptation to nutrient-poor environments. The understanding of the response of the traits related to nutrient conservation strategies to nutrient availability is limited. This study aims to address whether nutrient resorption of mangrove species is responsive to long-term nutrient enrichment.

Methods

A field-based study was carried out in a Kandelia obovata dominated mangrove stand where a nutrient gradient was generated by the long-term discharge of aquaculture wastewater. Seasonal variations of nutrient resorption and nutrient availability were assessed.

Important findings

The data from summer and winter showed the same results: 1) resorption proficiency or the nutrient concentrations (N and P) in senescent leaves did not varied with nutrient increas...

养分添加对衰老叶片养分回收（nutrient resorption）的影响是一个尚未完全阐明的重要研究课题。红树植物因适应低养分环境而演化出养分保守策略，这是其典型特征。目前学界对养分保守策略相关性状随养分可利用性变化的响应机制仍知之甚少。本研究旨在探究红树植物的养分回收能力是否会对长期养分富集产生响应。

研究方法
本研究以秋茄（Kandelia obovata）为优势种的红树林群落为研究对象，通过长期排放养殖废水构建养分梯度，进而开展野外原位实验。研究测定了养分回收及养分可利用性的季节变化特征。

重要研究结果
夏季与冬季的监测数据得到了一致的结果：1）养分回收精准度，即衰老叶片中的氮（N）与磷（P）浓度，并未随养分添加量的增加而发生变化……