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首页> 外文期刊>Soil Biology & Biochemistry >Biological processes dominate phosphorus dynamics under low phosphorus availability in organic horizons of temperate forest soils
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Biological processes dominate phosphorus dynamics under low phosphorus availability in organic horizons of temperate forest soils

机译：在温带森林土壤有机视野中低磷可用性下占磷动力学的主导

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Understanding the mechanisms underlying phosphorus (P) availability is important to predict forest productivity in a changing environment. We quantified P fluxes and traced P from plant litter into inorganic and organic soil P pools in organic horizons from two contrasting temperate forest soils with low and high inorganic P availability, respectively. We incubated the two organic horizons with and without litter after labelling the soil solution with P-33 and performed sequential extractions at several time points in order to trace P dynamics in labile (water extractable, available and microbial P) and non-labile (non-living organic P, P bound to iron and aluminium and P bound to calcium) pools. Under low P availability, P fluxes were dominated by gross P mineralization, and microbial P immobilization accounted for up to 95% of gross P mineralization. Additionally, labile P in plant litter was rapidly incorporated into microbial P and only a small fraction ended up in the non-labile inorganic P pools. In contrast, P fluxes under high P availability were dominated by abiotic processes, particularly by fast (within 10 days) sorption/desorption reactions between the available P and the P bound to aluminium. These findings support the hypothesis that under low P availability biological processes control P fluxes. The observed tight cycling of P, with little efflux due to net P mineralization, suggests that the mineralization of organic P is driven by microbial P demand, and that the microbial community could compete with plants for available P.
机译：了解磷（P）可用性的机制对于预测变化环境中的森林生产力是重要的。我们将P助熔剂量化与植物凋落物中的P助熔剂和追溯到有机化物中的无机和有机土壤P池，分别从低和高无机P可用性的两个对比的温带森林土壤中的有机视野。在用p-33标记土壤溶液后，在几个时间点进行序列萃取后，我们将两个有机视野孵育和没有凋亡，以追踪不稳定的P动态（可用，可用和微生物P）和非稳定性（非 - 为钢铁和铝合金和钙化的合并有机p，Pliving Organic P，P.在低P可用性下，P助焊剂由P毛细矿化占主导地位，微生物P固定化占PROSS P矿化的95％。另外，植物凋落物中的不稳定P迅速掺入微生物p中，并且仅在非不稳定的无机P池中最终的小部分。相反，在高p可用性下的P助熔剂由非生物过程主导，特别是通过快速（在10天内）可用的P和P与铝结合的P.之间的吸附/解吸反应。这些发现支持以下假设，即低P可用性生物过程控制P助焊剂。由于净P矿化导致的P，P的观察到的循环较小，表明有机P的矿化是通过微生物P要求驱动的，并且微生物群落可以与可用的植物竞争。

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