Divergent effects of grazing versus mowing on plant nutrients in typical steppe grasslands of Inner Mongolia

文献类型： 外文期刊

第一作者： Liu, Jiayue

作者： Liu, Jiayue;Li, Lu;Ji, Lei;Li, Yanlong;Liu, Jiaojiao;Li, Frank Yonghong;Liu, Jiayue;Li, Lu;Ji, Lei;Li, Yanlong;Liu, Jiaojiao;Li, Frank Yonghong;Li, Frank Yonghong;Ji, Lei

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关键词： grazing regime; mowing regime; plant shoot nutrient; plant root nutrient; typical steppe

期刊名称：JOURNAL OF PLANT ECOLOGY （ 影响因子：2.7； 五年影响因子：2.6 ）

ISSN： 1752-9921

年卷期： 2023 年 16 卷 1 期

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收录情况： SCI

摘要： Grazing and mowing are two major land use types in natural grasslands, which have intensive effects on nutrient cycling of grassland ecosystems by deposition of fecaluria nutrient versus removal of hay nutrient. Plant nutrients sensitively respond to the changes in nutrient cycling, while the information on the effects of diverse grazing versus mowing regimes on plant nutrients at different organs or levels are incomplete. A field experiment was conducted to compare the effects of continuous versus rotational grazing, and low versus high mowing frequencies on grassland ecosystems in a semiarid steppe of Inner Mongolia. Plant community characteristics and C, N and P concentrations of dominant species were determined across different managements. We found (i) plant community height and standing biomass significantly decreased with grazing intensity under both continuous and rotational grazing and under annual mowing. (ii) Plant shoot C concentration decreased, whereas N and P concentrations increased with grazing intensity in the two grazing regimes, while these concentrations showed no significant changes in response to the two mowing regimes. (iii) Plant community aboveground C, N and P pools significantly decreased with grazing intensity of both grazing regimes, but did not decrease with mowing frequency in the two mowing regimes. (iv) Plant root C, N and P concentrations showed little significant response to different grazing or mowing regimes, indicating a relatively bigger stability or slower response in plant root nutrients. Our study provides insights into the nutrient cycling in grazing and mowing grassland ecosystems from multiple perspectives.

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