Gao Yanju, Zhang Zhihao, Zhang Bo, Yin Hui, Chai Xutian, Xu Mengqi, Tariq Akash, Zeng Fanjiang
Xinjiang Key Laboratory of Desert Plant Roots Ecology and Vegetation Restoration, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China.
State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China.
Front Plant Sci. 2022 Mar 31;13:833869. doi: 10.3389/fpls.2022.833869. eCollection 2022.
The allocation patterns of foliar phosphorus (P) fractions across various vegetation types generally reflect the adaptability to P-impoverished environments. However, the allocation of foliar-P fractions within the desert herb () and shrub () in soils with different environment-P availability and the impact of soil and groundwater properties on foliar-P fractions allocation remain unclear. The foliar-P fractions (metabolites-P, nucleic acid-P, structural-P, and residual-P) of and and the properties of 0-60 cm deep soil under their canopy and groundwater were determined at four different environment-P sites. Results found that as environment-P availability decreased, both plants allocated the higher proportions of foliar-P to nucleic acid-P than to metabolites-P and structural-P. With the exception of residual-P, foliar-P fractions were markedly higher for than . Soil Olsen-P, NO -N, soil water content, electrical conductivity (EC), groundwater EC, and total dissolved solids (TDSs) played an important role in allocating foliar P-fractions for both and . Compared with , the foliar-P fractions of were more tightly bounded to groundwater than soil properties. Overall, these findings show how desert plants flexibility take advantage of the foliar-P in low environment-P availability and illustrate the foliar-P fractions allocation of desert plants is driven by soil and groundwater properties.
不同植被类型中叶磷（P）组分的分配模式通常反映了对缺磷环境的适应性。然而，在不同环境磷有效性的土壤中，荒漠草本植物（ ）和灌木（ ）叶片磷组分的分配情况，以及土壤和地下水性质对叶片磷组分分配的影响仍不清楚。在四个不同环境磷水平的地点，测定了 和 的叶片磷组分（代谢物磷、核酸磷、结构磷和残余磷）及其冠层下0 - 60厘米深土壤和地下水的性质。结果发现，随着环境磷有效性的降低，两种植物将更高比例的叶片磷分配给核酸磷，而非代谢物磷和结构磷。除残余磷外， 的叶片磷组分显著高于 。土壤有效磷、硝态氮、土壤含水量、电导率（EC）、地下水EC和总溶解固体（TDS）在 和 的叶片磷组分分配中起重要作用。与 相比， 的叶片磷组分与地下水的关系比与土壤性质的关系更紧密。总体而言，这些发现表明荒漠植物如何在低环境磷有效性下灵活利用叶片磷，并说明荒漠植物叶片磷组分的分配受土壤和地下水性质驱动。
