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氮素添加通过活化土壤矿物结合态磷缓解草原植物磷限制
Nitrogen enrichment buffers phosphorus limitation by mobilizing mineral‐bound soil phosphorus in grasslands
杨俊杰(中国科学院植物研究所)
发布时间:2021/12/28 16:47:52
摘要
土壤无机磷因与铁铝氧化物、含钙矿物等结合,而形成易溶性、难溶性等无机磷组分;这些矿物结合态磷占土壤全磷的比例高达82%,但很难被植物直接利用。全球氮素富集的背景下,生态系统将由氮限制转变为磷限制已成共识;但该转变过程中,土壤磷素的转化与供应情况尚不清楚。 中国科学院植物研究所韩兴国研究团队通过结合10年的草原氮添加野外控制试验和中国北方3700 km草原样带调查,系统探讨了草原生态系统的磷供应状况及其对氮素富集的响应机制。研究发现,长期氮添加导致草原土壤酸化,促进难溶性无机磷组分向易溶性无机磷转化,土壤有效磷增加5倍之多;北方草原样带与控制试验结果相符,自西向东随土壤pH下降、土壤全氮升高,易溶性无机磷与难溶性无机磷之间的比例上升,表征了难溶性无机磷向易溶性无机磷的转化。此外,长期氮添加通过促进植物磷吸收、土壤磷素淋溶等过程,导致草原土壤全磷下降10%;由此可见,生态系统氮富集可通过活化矿物结合态磷而提升土壤磷供应能力,但长此以往可能会逐渐导致土壤磷库耗竭。该研究有助于为欧亚草原生态系统磷素管理、中国北方退化草原生态恢复提供理论依据和决策参考。
Phosphorus (P) limitation is expected to increase due to nitrogen (N)-induced terrestrial eutrophication, although most soils contain large P pools immobilized in minerals (Pi) and organic matter (Po). Here we assessed whether transformations of these P pools can increase plant available pools alleviating P limitation under enhanced N availability. The mechanisms underlying these possible transformations were explored by combining results from a 10-year field N-addition experiment and a 3700-km transect covering wide ranges in soil pH, soil N, aridity, leaching, and weathering that can affect soil P status in grasslands. Nitrogen addition promoted dissolution of immobile Pi (mainly Ca-bound recalcitrant P) to more available forms of Pi (including Al- and Fe-bound P fractions and Olsen P) by decreasing soil pH from 7.6 to 4.7, but did not affect Po. Soil total P declined by 10% from 385±6.8 to 346±9.5 mg kg-1, while available-P increased by 546% from 3.5±0.3 to 22.6±2.4 mg kg-1 after 10-year N addition, associated with an increase in Pi mobilization, plant uptake, and leaching. Similar to the N-addition experiment, the drop in soil pH from 7.5 to 5.6 and increase in soil N concentration along the grassland transect were associated with an increased ratio between relatively mobile Pi and immobile Pi. Our results provide a new mechanistic understanding of the important role of soil Pi mobilization in maintaining plant P supply and accelerating biogeochemical P cycles under anthropogenic N enrichment. This mobilization process temporarily buffers ecosystem P-limitation or even causes P eutrophication but will extensively deplete soil P soils in the long run.
关键词
气候序列,矿物结合态磷,氮沉降,磷限制,磷活化,降水梯度
数据引用
必引文献:
数据引用: 数据来源于:氮素添加通过活化土壤矿物结合态磷缓解草原植物磷限制,杨俊杰(中国科学院植物研究所), 2021, 中国科学院植物科学数据中心, DOI:10.1002/ecy.3616

Normative references:Nitrogen enrichment buffers phosphorus limitation by mobilizing mineral‐bound soil phosphorus in grasslands, 2021, Plant Data Center of Chinese Academy of Sciences, DOI:10.1002/ecy.3616
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Acknowledgements:
  Acknowledgement for the data support from Plant Data Center of Chinese Academy of Sciences (https://www.plantplus.cn).
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数据提供者
数据提供机构:中国科学院植物研究所
数据提供者:杨俊杰
联系人:杨俊杰
联系电话:010-62836974
电子邮箱:yangjunjie@ibcas.ac.cn