放牧对荒漠草原克氏针茅种群和土壤生态化学计量特征的影响
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内蒙古农业大学林学院

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Effects of Grazing on Ecological Stoichiometry of Stipa krylovii and Soil in Desert Grassland
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    摘要:

    草原生态系统是陆地生态系统的重要组成部分之一,草地资源是牧民赖以生存的基础,但近年来随着牧区人口数量的增加和对草地的过渡开发利用,草地生态系统遭到严重破坏。本文选取内蒙古荒漠草原,不同放牧强度下的克氏针茅种群地上及地下部分与土壤中C、N、P含量进行了一系列的研究。结果表明:轻度放牧下荒漠草原的物种多样性均显著高于中度、重度放牧条件(P<0.05)。土壤中C、N、C:N、N:P、C:P,均随着放牧强度的增加,呈现先升高后降低的规律,土壤P含量随放牧强度的增加而升高。随放牧强度增加,克氏针茅地上部分C含量降低,N、P、N:P先升高后降低,C:P则先减少后升高;克氏针茅地下部分的C、N、N:P一直呈增加的趋势,P含量先减少后升高,而C:N、C:P则是与P含量规律相反。与地上部分各元素含量相比,克氏针茅地下部分各元素含量及其比值与土壤中各元素含量的相关性更高,说明放牧条件下荒漠草原优势植物的根系与其所处的土壤环境具有一定的协同变化能力。

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    Grassland ecosystem is one of the most important components of terrestrial ecosystem. Grassland resources are the basis for herdsmen to survive, in recent years with the increase of population in pastoral areas and the over-exploitation and utilization of grassland, the grassland ecosystem has been seriously damaged. In this paper, the contents of C, N and P in the overground and underground parts of Stipa krylovii population and soil under different grazing intensities were studied in desert grassland of Inner Mongolia. The results showed that the species diversity of desert grassland was significantly higher than that of moderate and heavy grazing (P < 0.05). With the increase of grazing intensity, The content of C, N, C:N, N:P, C:P in the soil increases first and then decreases, and the content of P in the soil increases with the increase of grazing intensity. With the increase of grazing intensity, the content of C in the aboveground part of Stipa krylovii decreased, and N, P, N:P increased first and then decreased, while C:P decreased first and then increased. The contents of C, N, N:P in the underground part of Stipa krylovii have been increasing. P content first decreased and then increased, while C:N, C:P were contrary to the rule of p content. Compared with the contents of elements in the overground part, The correlation between the content and ratio in the underground part of Stipa krylovii and the contents of elements in the soil is higher, which indicates that the root system of dominant plants in the desert grassland and its soil environment have certain cooperative change ability under grazing conditions.

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  • 收稿日期:2019-10-14
  • 最后修改日期:2020-02-25
  • 录用日期:2020-02-16
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