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Effect of grazing exclusion and rotational grazing on labile soil organic carbon in north China
European Journal of Soil Science ( IF 4.2 ) Pub Date : 2020-02-29 , DOI: 10.1111/ejss.12952
Lei Dong 1, 2, 3 , Vegard Martinsen 2 , Yantao Wu 3 , Ying Zheng 3 , Cunzhu Liang 3 , Zhongling Liu 3 , Jan Mulder 2
Affiliation  

Overgrazing has caused serious grassland soil deterioration and significant soil organic carbon (SOC) losses. Controlled grazing is recommended for restoring grassland and enhancing SOC stocks. Studies have suggested that, in particular, labile organic carbon (C) is a sensitive indicator for soil degradation and SOC recovery, but few studies of the effect of different grassland management practices have been published so far. Here, we investigate the effects of long‐term grazing exclusion and short‐term rotational grazing with different grazing intensities on labile SOC, including hot water extractable organic C (HWEC) and particulate organic C (POC), as well as potential N mineralization (Nmin) rate in soils (0–10 cm) of two grasslands in Xilinhot, Inner Mongolia. Treatments include long‐term (34 years) exclusion, medium‐term (21 years) exclusion and continuous grazing (ambient grazing) at one of the sites, and we investigate no grazing, light grazing, moderate grazing and high‐grazing intensity at the study site for rotational grazing. Our results show that grazing exclusion significantly enhances labile SOC stocks and potential Nmin rate compared to ambient grazing (e.g., POC stock at long‐ and medium‐term exclusion and ambient grazing are 5.71 ± 0.94 Mg C ha−1, 3.25 ± 0.30 Mg C ha−1 and 2.12 ± 0.38 Mg C ha−1, respectively). However, after two decades of exclusion, the potential for further C sequestration is limited. Five years of rotational grazing significantly enhances HWEC, but not POC and potential Nmin rate, when comparing the highest grazing intensity (1.88 sheep ha−1 yr−1) with grazing exclusion during the same period. We conclude that rotational grazing may be a viable alternative to exclusion, offering a more rational use of grassland without causing soil C loss. We also show that HWEC is a particularly sensitive labile SOC indicator and is tightly correlated to POC and potential Nmin rate.

中文翻译:

北方放牧和轮牧对不稳定土壤有机碳的影响

过度放牧已导致草原土壤严重恶化,土壤有机碳(SOC)大量损失。建议使用控制性放牧来恢复草地和增加SOC库存。研究表明,尤其是不稳定的有机碳(C)是土壤退化和SOC恢复的敏感指标,但迄今为止,很少有关于不同草地管理实践影响的研究发表。在这里,我们研究了长期放牧和短期放牧不同放牧强度对不稳定SOC(包括热水可萃取有机碳(HWEC)和颗粒有机碳(POC))以及潜在氮矿化的影响( N分钟)在内蒙古锡林浩特的两个草原(0-10厘米)的土壤中的比率。处理包括在其中一个地点进行的长期(34年)排斥,中期(21年)排斥和连续放牧(环境放牧),我们调查了该地点没有放牧,轻度放牧,中度放牧和高放牧强度研究场所进行轮牧。我们的研究结果表明,放牧排阻显著增强不稳定SOC股票和潜在的N分钟相比环境放牧(在长期和中期排斥和环境放牧是5.71±0.94镁Ç公顷例如,POC库存率-1,3.25±0.30的Mg C ha -1和2.12±0.38 Mg C ha -1, 分别)。但是,在排除了二十年之后,进一步封存碳的潜力是有限的。当将最高放牧强度(1.88羊ha -1 yr -1)与同期的放牧排斥进行比较时,五年轮牧放牧显着提高了HWEC,但没有提高POC和潜在的N min率。我们得出的结论是,轮牧可能是排除牧草的可行选择,可以更合理地利用草地而不会造成土壤碳损失。我们还显示,HWEC是特别敏感的不稳定SOC指标,并且与POC和潜在的N min速率紧密相关。
更新日期:2020-02-29
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