Widespread controls of leaf nutrient resorption by nutrient limitation and stoichiometry

Leaf nutrient resorption is a key process in nutrient cycles, but fundamental knowledge regarding its control mechanisms remains limited. Among the three proposed basic control mechanisms on leaf nutrient resorption, namely nutrient concentration control, nutrient limitation control, and stoichiometry control, only the first has been demonstrated to exist globally, while the latter two have not been systematically evaluated.
Here, we conducted a global data synthesis to explore nutrient limitation and stoichiometry control on leaf resorption of carbon, nitrogen, phosphorus, sulfur, potassium, calcium, and magnesium, based on 3,395 data points from 109 peer-reviewed studies. 
Results showed that the nutrient limitation control existed globally, but was only applicable for the resorption of nitrogen, phosphorus, and potassium. The stoichiometry control existed globally for carbon and all studied nutrients, and coexisted with nutrient limitation control. Conifers’ resorption relied primari..., ,

叶片养分重吸收是养分循环中的关键过程，但目前学界对其调控机制的基础认知仍较为有限。目前针对叶片养分重吸收提出的三类基础调控机制分别为养分浓度调控（nutrient concentration control）、养分限制调控（nutrient limitation control）与化学计量学调控（stoichiometry control），其中仅第一类机制已被证实具有全球普遍性，后两类尚未得到系统性评估。
本研究基于109项同行评议研究的3395个数据点，开展全球数据综合分析，以探究养分限制调控与化学计量学调控对碳、氮、磷、硫、钾、钙、镁的叶片养分重吸收过程的影响。
研究结果表明，养分限制调控具有全球普遍性，但仅适用于氮、磷、钾的叶片养分重吸收过程；化学计量学调控对碳及所有研究养分均具有全球普遍性，且可与养分限制调控共同发挥作用。针叶树的养分回收主要依赖……