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首页> 外文期刊>Ecological Modelling >Modeling SOC and NPP responses of meadow steppe to different grazing intensities in Northeast China
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Modeling SOC and NPP responses of meadow steppe to different grazing intensities in Northeast China

机译：东北草原草甸草原对不同放牧强度的SOC和NPP响应模拟

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摘要

Grassland ecosystems play an important role in Chinese terrestrial ecosystems. However, great demand and excessive utilization of human beings on grassland resources have made it more susceptible to rapid degeneration in ecosystem properties and soil carbon levels. Among them, grazing is one of the key factors to make grassland ecosystems degraded. Therefore, it is very important to graze sustainably on grassland for preventing the degradation of grasslands. In this paper, as a case study, we simulated the potential changes of soil organic carbon (SOC) and net primary productivity (NPP) of meadow steppe dominated by Leymus chinensis under different grazing intensities based on CENTURY model (V4.0) in order to evaluate the effects of different grazing intensities and to pursue for optimal grazing intensity. The results showed that NPP and SOC of meadow steppe dominated by Leymus chinensis were very sensitive to grazing intensity. The optimal grazing intensity could be expressed by live shoots, and it should be less than 40% of whole live shoots per month, in order to mitigate the degradation of Leymus chinensis grassland and maintain its sustainable development.
机译：草原生态系统在中国陆地生态系统中起着重要作用。但是，人类对草地资源的巨大需求和过度利用，使其更容易受到生态系统特性和土壤碳水平快速退化的影响。其中，放牧是使草地生态系统退化的关键因素之一。因此，在草地上持续放牧对防止草地退化非常重要。本文以CENTURY模型（V4.0）为基础，以不同放牧强度为模拟对象，以羊草为主的草甸草原土壤有机碳（SOC）和净初级生产力（NPP）的变化规律进行了模拟。评估不同放牧强度的影响并追求最佳放牧强度。结果表明，以羊草为主导的草甸草原的NPP和SOC对放牧强度非常敏感。最佳放牧强度可以通过实生芽来表达，并且应小于每月整个实生芽的40％，以减轻羊草草原退化并维持其可持续发展。

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