Increasing the organic carbon stocks in mineral soils sequesters large amounts of phosphorus
Increasing the organic carbon stocks in mineral soils sequesters large amounts of phosphorus
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DOI：
10.1111/gcb.15154
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发表时间：
2020-05
影响因子：
11.6
通讯作者：
M. Spohn
中科院分区：
文献类型：
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作者：
M. Spohn
尽管磷在许多生态系统中对植物生物量的生产至关重要，但土壤有机碳（OC）固存对磷循环的影响还很少被讨论。因此，本研究的目的是，第一，合成结果之间的关系在土壤有机质（SOM）和有机质输入到土壤中，第二，审查的过程，影响SOM的C：P比，第三，讨论的影响OC存储在陆地生态系统中的磷固存。研究表明，由于矿物质土壤中的SOM含有丰富的P，因此矿物质土壤中OC的储存导致大量有机磷（OP）的封存。土壤中OP相对于OC强烈富集的原因是OC的矿化和形成富含P的微生物坏死团以及OP对矿物表面的强烈吸附，从而阻止OP矿化。特别是，矿物相关的有机质的形成，有利于存储OC在土壤中超过十年至百年的时间尺度螯合大量的OP。存储1,000公斤C的粘土大小的部分在农田表土螯合13.1公斤P。相比之下，木材和泥炭地的OC：OP比远远大于农田土壤。因此，碳储存在泥炭地的木材螯合磷少得多的存储比OC在矿质土壤。为了增加陆地生态系统的C储量，尽可能少地锁定P，保护和恢复泥炭地，生产和保存木材比在矿质土壤中储存OC更合理。
Despite the fact that phosphorus (P) is critical for plant biomass production in many ecosystems, the implications of soil organic carbon (OC) sequestration for the P cycle have hardly been discussed yet. Thus, the aims of this study are, first, to synthesize results about the relationship between C and P in soil organic matter (SOM) and organic matter inputs to soils, second, to review processes that affect the C:P ratio of SOM, and third, to discuss implications of OC storage in terrestrial ecosystems for P sequestration. The study shows that the storage of OC in mineral soils leads to the sequestration of large amounts of organic phosphorus (OP) since SOM in mineral soils is very rich in P. The reasons for the strong enrichment of OP with respect to OC in soils are the mineralization of OC and the formation of microbial necromass that is P‐rich as well as the strong sorption of OP to mineral surfaces that prevents OP mineralization. In particular, the formation of mineral‐associated SOM that is favorable for storing OC in soil over decadal to centennial timescales sequesters large amounts of OP. Storage of 1,000 kg C in the clay size fraction in the topsoils of croplands sequesters 13.1 kg P. In contrast, the OC:OP ratios of wood and of peatlands are much larger than the ones in cropland soils. Thus, storage of C in wood in peatlands sequesters much less P than the storage of OC in mineral soils. In order to increase the C stocks in terrestrial ecosystems and to lock up as little P as possible, it would be more reasonable to protect and restore peatlands and to produce and preserve wood than to store OC in mineral soils.