Mowing mitigates the negative impacts of N addition on plant species diversity

Yang, Guo-Jiao; Lü, Xiao-Tao; Stevens, Carly J.; Zhang, Guang-Ming; Wang, Hong-Yi; Wang, Zheng-Wen; Zhang, Zi-Jia; Liu, Zhuo-Yi; Han, Xing-Guo

doi:10.1007/s00442-019-04353-9

Community ecology – original research
Published: 06 February 2019

Mowing mitigates the negative impacts of N addition on plant species diversity

Guo-Jiao Yang^1,2,
Xiao-Tao Lü ORCID: orcid.org/0000-0001-5571-1895¹,
Carly J. Stevens³,
Guang-Ming Zhang⁴,
Hong-Yi Wang^1,5,
Zheng-Wen Wang¹,
Zi-Jia Zhang¹,
Zhuo-Yi Liu^1,2 &
Xing-Guo Han^1,2,4

Oecologia volume 189, pages 769–779 (2019)Cite this article

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Abstract

Increasing availability of reactive nitrogen (N) threatens plant diversity in diverse ecosystems. While there is mounting evidence for the negative impacts of N deposition on one component of diversity, species richness, we know little about its effects on another one, species evenness. It is suspected that ecosystem management practice that removes nitrogen from the ecosystem, such as hay-harvesting by mowing in grasslands, would mitigate the negative impacts of N deposition on plant diversity. However, empirical evidence is scarce. Here, we reported the main and interactive effects of N deposition and mowing on plant diversity in a temperate meadow steppe with 4-year data from a field experiment within which multi-level N addition rates and multiple N compounds are considered. Across all the types of N compounds, species richness and evenness significantly decreased with the increases of N addition rate, which was mainly caused by the growth of a tall rhizomatous grass, Leymus chinensis. Such negative impacts of N addition were accumulating with time. Mowing significantly reduced the dominance of L. chinensis, and mitigated the negative impacts of N deposition on species evenness. We present robust evidence that N deposition threatened biodiversity by reducing both species richness and evenness, a process which could be alleviated by mowing. Our results highlight the changes of species evenness in driving the negative impacts of N deposition on plant diversity and the role of mowing in mediating such negative impacts of N deposition.

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Acknowledgements

We acknowledge the staff of Erguna Forest-Steppe Ecotone Research Station for their support. We thank Ting-Ting Ren, Pei Zheng, Yan-Yu Hu, Zhi-Wei Zhang, Rui Ding and many undergraduate students from Heilongjiang Bayi Agricultural University for their help in field work and Hai-Yang Zhang for help in data analysis. Comments and suggestions from two anonymous reviewers help improve the quality of this paper. This work was supported by the National Natural Science Foundation of China (31430016, 31822006, and 31770503), National Basic Research Program of China (2016YFC0500601 and 2015CB150802), Strategic Priority Research Program of the Chinese Academy of Sciences (XDB15010403), Youth Innovation Promotion Association CAS (2014174), and the Key Research Program from CAS (QYZDB-SSW-DQC006).

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Erguna Forest-Steppe Ecotone Research Station, CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China
Guo-Jiao Yang, Xiao-Tao Lü, Hong-Yi Wang, Zheng-Wen Wang, Zi-Jia Zhang, Zhuo-Yi Liu & Xing-Guo Han
University of Chinese Academy of Sciences, Beijing, 100049, China
Guo-Jiao Yang, Zhuo-Yi Liu & Xing-Guo Han
Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, UK
Carly J. Stevens
State Key Laboratory of Vegetation of Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
Guang-Ming Zhang & Xing-Guo Han
Heilongjiang Bayi Agricultural University, Daqing, 163319, China
Hong-Yi Wang

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Guo-Jiao Yang
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Xiao-Tao Lü
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Carly J. Stevens
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Contributions

XH, ZW and XL conceived and designed the experiments. GY, GZ, HW, ZZ, ZL performed the experiments. GY and XL analyzed the data. GY wrote the first draft, XL and CS revised the manuscript; other authors provided editorial advice.

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Correspondence to Xiao-Tao Lü.

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Communicated by Brian J. Wilsey.

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Yang, GJ., Lü, XT., Stevens, C.J. et al. Mowing mitigates the negative impacts of N addition on plant species diversity. Oecologia 189, 769–779 (2019). https://doi.org/10.1007/s00442-019-04353-9

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Received: 22 July 2018
Accepted: 01 February 2019
Published: 06 February 2019
Issue Date: 06 March 2019
DOI: https://doi.org/10.1007/s00442-019-04353-9

Keywords

Biodiversity loss
Nitrogen compounds
Hay-making
Community evenness
Semi-arid grassland