Leguminous plants significantly increase soil nitrogen cycling across global climates and ecosystem types
Leguminous plants significantly increase soil nitrogen cycling across global climates and ecosystem types
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DOI：
10.1111/gcb.16742
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发表时间：
2023-04
影响因子：
11.6
通讯作者：
Xiaomei Gou;P. Reich;L. Qiu;M. Shao;G. Wei;Jingjing Wang;Xiaorong Wei
中科院分区：
文献类型：
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作者：
Xiaomei Gou;P. Reich;L. Qiu;M. Shao;G. Wei;Jingjing Wang;Xiaorong Wei
豆科植物是陆地生态系统的重要组成部分，显著增加土壤氮循环和有效性，影响大多数生态系统的生产力。明确豆科植物对氮循环的影响是否随不同的生态系统类型和气候区域而变化，对于理解和预测生态系统过程至关重要，但这些影响目前尚不清楚。通过进行全球Meta分析，我们发现豆科植物使土壤净氮矿化率（Rmin）增加了67%，高于最近报道的与氮沉积相关的增加（25%）。这种效应在热带地区（53%）和温带地区（81%）相似，但在草原（151%）和森林（74%）中显著高于农田（-3%），并且在原位孵育（101%）或短期实验（112%）中大于实验室孵育（55%）或长期实验（37%）。豆科植物显著影响Rmin对氮肥和试验因素的依赖性。在非豆科土壤中施氮显著增加了Rmin，但在豆科土壤中没有。此外，年均温、土壤养分和试验持续时间对Rmin的影响在豆科土壤中比在非豆科土壤中小。总的来说，我们的研究结果突出了豆科植物对土壤氮循环的显着积极影响，并指出，豆科植物的影响，应阐明在解决土壤对植物的反应。
Leguminous plants are an important component of terrestrial ecosystems and significantly increase soil nitrogen (N) cycling and availability, which affects productivity in most ecosystems. Clarifying whether the effects of legumes on N cycling vary with contrasting ecosystem types and climatic regions is crucial for understanding and predicting ecosystem processes, but these effects are currently unknown. By conducting a global meta‐analysis, we revealed that legumes increased the soil net N mineralization rate (Rmin) by 67%, which was greater than the recently reported increase associated with N deposition (25%). This effect was similar for tropical (53%) and temperate regions (81%) but was significantly greater in grasslands (151%) and forests (74%) than in croplands (−3%) and was greater in in situ incubation (101%) or short‐term experiments (112%) than in laboratory incubation (55%) or long‐term experiments (37%). Legumes significantly influenced the dependence of Rmin on N fertilization and experimental factors. The Rmin was significantly increased by N fertilization in the nonlegume soils, but not in the legume soils. In addition, the effects of mean annual temperature, soil nutrients and experimental duration on Rmin were smaller in the legume soils than in the nonlegume soils. Collectively, our results highlighted the significant positive effects of legumes on soil N cycling, and indicated that the effects of legumes should be elucidated when addressing the response of soils to plants.