A survey of leaf phosphorus fractions and leaf economic traits among 12 co-occurring woody species on phosphorus-impoverished soils
A survey of leaf phosphorus fractions and leaf economic traits among 12 co-occurring woody species on phosphorus-impoverished soils
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DOI：
10.1007/s11104-023-06001-x
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发表时间：
2023-04-04
期刊：
影响因子：
4.9
通讯作者：
Wright，Ian J.
中科院分区：
文献类型：
--
作者：
Tsujii，Yuki;Fan，Baoli;Wright，Ian J.
背景和目的叶片经济光谱(LES)与对光合作用过程和叶片结构的干质量和营养投资有关，也与这些投资的回报期限(叶片寿命，Ll)有关。磷是植物生长的关键限制养分，但目前还不清楚叶片磷在不同功能之间的分配如何与LES协调。方法测定了3个先锋树种和9个非先锋树种的叶片经济性状，包括LL、单位面积叶质量(LMA)、单位质量光饱和净光合速率(AMASS)、暗呼吸速率、P浓度([P总])、氮浓度和P吸收。将叶P分为正磷酸盐P(PI)、代谢物P(PM)、核酸P(PN)、脂类P(PL)和残留P(PR)5个功能组分。先锋物种出现在光谱的短端，表现出比非先锋物种更高的[P总]，主要与较高的PI、PN和PL浓度有关。叶片P组分与LL、LMA无显著相关，而与PR浓度呈正相关。结论不同树种叶片P在不同组分中的分配存在较大差异。这种变异部分与LES有关，这可能为不同生态策略的物种在磷限制下共存提供了一种机制。
Background and AimsThe leaf economic spectrum (LES) is related to dry mass and nutrient investments towards photosynthetic processes and leaf structures, and to the duration of returns on those investments (leaf lifespan, LL). Phosphorus (P) is a key limiting nutrient for plant growth, yet it is unclear how the allocation of leaf P among different functions is coordinated with the LES. We addressed this question among 12 evergreen woody species co-occurring on P-impoverished soils in south-eastern Australia.MethodsLeaf ‘economic’ traits, including LL, leaf mass per area (LMA), light-saturated net photosynthetic rate per mass (Amass), dark respiration rate, P concentration ([Ptotal]), nitrogen concentration, and P resorption, were measured for three pioneer and nine non-pioneer species. Leaf P was separated into five functional fractions: orthophosphate P (Pi), metabolite P (PM), nucleic acid P (PN), lipid P (PL), and residual P (PR; phosphorylated proteins and unidentified compounds that contain P).ResultsLL was negatively correlated with Amassand positively correlated with LMA, representing the LES. Pioneers occurred towards the short-LL end of the spectrum and exhibited higher [Ptotal] than non-pioneer species, primarily associated with higher concentrations of Pi, PNand PL. There were no significant correlations between leaf P fractions and LL or LMA, while Amasswas positively correlated with the concentration of PR.ConclusionsAllocation of leaf P to different fractions varied substantially among species. This variation was partially associated with the LES, which may provide a mechanism underlying co-occurrence of species with different ecological strategies under P limitation.