Annual mowing mitigates the negative legacy effects of N enrichment on grassland nutrient use efficiency

doi:10.1093/jpe/rtab055

Journal of Plant Ecology ›› 2021, Vol. 14 ›› Issue (5): 959-969.DOI: 10.1093/jpe/rtab055

收稿日期:2021-01-10 修回日期:2021-03-08 接受日期:2021-04-25 出版日期:2021-10-01 发布日期:2021-08-06

Annual mowing mitigates the negative legacy effects of N enrichment on grassland nutrient use efficiency

Yan-Yu Hu1^,2, Zhi-Wei Zhang^1,2, Shuang-Li Hou¹, Jun-Jie Yang^1,3 and Xiao-Tao Lü^1,
*

¹Erguna Forest-Steppe Ecotone Research Station, CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China, ² University of Chinese Academy of Sciences, Beijing 100049, China, ³ State Key Laboratory of Vegetation of Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China

^*Corresponding author. E-mail: lvxiaotao@iae.ac.cn

Received:2021-01-10 Revised:2021-03-08 Accepted:2021-04-25 Online:2021-10-01 Published:2021-08-06

摘要/Abstract

摘要： 刈割能够缓解历史氮沉降对草地群落养分利用效率的负面影响
氮沉降的增加对草地生态系统结构和功能造成了诸多负面影响，包括改变植物群落结构和降低植物养分利用效率。许多国家的减排政策有效地减少了氮排放、降低了氮沉降速率，但历史氮沉降对生态系统的影响可能具有遗留效应。草地植物群落的养分利用效率在氮沉降减少或者停止后作出何种响应，还有待于研究。作为草地重要的管理方式之一，刈割将如何调控历史氮沉降对植物养分利用效率的影响仍然属于知识空白。本研究探讨了氮素添加停止以后连续3年内功能群水平和群落水平上植物的氮、磷利用效率对历史氮素添加和刈割处理的响应。研究结果表明，历史氮素添加显著降低了植物功能群水平的氮利用效率，但未改变其磷利用效率；在群落水平上，历史氮素添加显著降低了植物的氮磷利用效率。刈割能够缓解历史氮素添加对植物群落氮磷利用效率的降低作用，该作用主要是抑制具有较低养分利用效率的根茎型高禾草的生长而促进具有较高养分利用效率的丛生型高禾草的生长。研究结果揭示了植物群落结构在驱动植物群落养分利用效率变化中的重要作用。本研究认为适当的草地管理方式有助于氮沉降过后草地植物养分利用效率的恢复。

关键词: 群落结构, 刈割, 遗留效应, 养分利用, 植物功能群, 半干旱草原

Abstract:

Aims

Plant nutrient use efficiency, an important factor driving primary production, is sensitive to nitrogen (N) deposition. Because of strengthened regulations of N emissions, atmospheric N deposition is decreasing in many countries. It remains unknown whether historical N enrichment would alter plant nutrient use efficiency and whether such impacts would be mitigated by ecosystem management strategy.

Methods

We assessed the effects of historical N addition and mowing on plant N and phosphorus use efficiency (NUE and PUE) at both functional group and community levels in a temperate steppe after the cessation of 6-year N addition.

Important Findings

Historical N addition had negative legacy effects on plant NUE but not on PUE at the functional group level. There were negative legacy effects of N addition on community-level NUE and PUE, but only in the unmown plots. Mowing mitigated the negative legacy effects of N enrichment on community-level NUE and PUE by reducing the dominance of tall rhizomatous grass but enhancing that of tall bunchgrass. Our results highlight the importance of community composition variations caused by mowing in driving the legacy effects of N enrichment on community-level nutrient use efficiency. Given the slow recovery of community composition following cessation of N deposition, our findings suggest that the lower nutrient efficiency of plant community would be long-lasting.

Key words: community composition, hay harvest, legacy effect, nutrient utilization, plant functional type, semiarid grassland

. [J]. Journal of Plant Ecology, 2021, 14(5): 959-969.

Yan-Yu Hu, Zhi-Wei Zhang, Shuang-Li Hou, Jun-Jie Yang and Xiao-Tao Lü. Annual mowing mitigates the negative legacy effects of N enrichment on grassland nutrient use efficiency [J]. J Plant Ecol, 2021, 14(5): 959-969.

[1]	. 氮、锌添加与刈割对草甸草原植物养分回收的影响[J]. Journal of Plant Ecology, 2026, 19(2): 0-.
[2]	. 温带森林外生菌根优势度对土壤碳氮的地上-地下影响途径[J]. Journal of Plant Ecology, 2026, 19(1): 1-0.
[3]	. 披碱草属牧草生长和繁殖性状对刈割的耐受性响应机制[J]. Journal of Plant Ecology, 2025, 18(6): 1-30.
[4]	. 适应性放牧促进半干旱草原土壤种子库的丰富度和密度[J]. Journal of Plant Ecology, 2025, 18(3): 1-12.
[5]	. 中国植物叶片构建成本的变化及其环境驱动因素[J]. Journal of Plant Ecology, 2025, 18(2): 1-14.
[6]	. 随机生态过程构建了三江源国家公园的土壤微生物群落[J]. Journal of Plant Ecology, 2025, 18(2): 1-17.
[7]	. 氮添加对草地生态系统CH₄吸收与N₂O排放耦合关系的影响[J]. Journal of Plant Ecology, 2024, 17(6): 1-14.
[8]	. 气候变暖导致中国北方草原植物的生殖物候提前[J]. Journal of Plant Ecology, 2024, 17(6): 1-.
[9]	. 草地地上生产力对极端降水事件的响应[J]. Journal of Plant Ecology, 2024, 17(6): 1-12.
[10]	. 典型农牧交错带中基于微地形营造的生态恢复措施对植物群落构建的影响[J]. Journal of Plant Ecology, 2024, 17(5): 1-13.
[11]	. 极端干旱与食草昆虫对草原群落的交互作用受干旱模式的影响[J]. Journal of Plant Ecology, 2024, 17(3): 0-rtae041.
[12]	. 青藏高原退化高寒草地的植物-土壤反馈机制[J]. Journal of Plant Ecology, 2024, 17(2): 0-rtae025.
[13]	. 磷不是内蒙古温带典型草原地上净初级生产力的主要限制因素[J]. Journal of Plant Ecology, 2023, 16(4): 0-rtac085.
[14]	. 基于不同养分策略的亚热带常绿与落叶树种的共存机制[J]. Journal of Plant Ecology, 2023, 16(4): 0-rtac093.
[15]	. 北暖温带地区油松人工林天然发育恢复过程中的植被群落动态[J]. Journal of Plant Ecology, 2023, 16(4): 0-rtac102.

Annual mowing mitigates the negative legacy effects of N enrichment on grassland nutrient use efficiency

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

编辑推荐

Metrics

本文评价