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首页> 外文会议>International conference on green energy and environmental sustainable development >Changes in Ecological characteristic and Soil Carbon Sequestration along the Retrogressive Succession of Grassland Ecosystem on Western Songnen Plain
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Changes in Ecological characteristic and Soil Carbon Sequestration along the Retrogressive Succession of Grassland Ecosystem on Western Songnen Plain

机译：松嫩平原西部草地生态系统退步演替过程中生态特征和土壤固碳的变化

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Grassland degradation is one of the major ecological problems in western Jilin province. Grassland degradation changes the carbon balance of grassland ecosystem. During the degradation, different plant communities of grassland ecosystem formed along the retrogressive succession in western Songnen Plain, such as Leymus chinensis→Chloris virgata→PuccineIlia tenuiflora→ Suaeda glauca, then saline-alkali land. The experimental sites were located in Jiang-jia-dian meadow, which is one of the largest three natural Leymus chinensis steppe in China. The chronosequence approach (space-fortimc substitution) is a viable tool for obtaining integrated information on successional studies, the primary objective of this study was to certain the impact of retrogressive succession on the soil carbon sequestration of grassland ecosystem. Six sampling strips (50cmx50cm) and four profiles were selected in each experimental sites for measuring plant species, cover, aboveground biomass, soil bulk density, total N and soil organic carbon. The results showed that the plant community composition changed, and the number of plant species and the cover decreased. Moreover, SOC were positively related to soil moisture and soil total nitrogen (P<0.05), retrogressive succession caused by grassland degradation affected not only in the surface layer, but also notably in the deeper layers. It is not a simple carbon source, moderate grassland degradation had a positive effect on carbon reserve while excessive degradation would accelerate the loss of grassland carbon reserve.
机译：草地退化是吉林省西部的主要生态问题之一。草地退化改变了草地生态系统的碳平衡。在退化过程中，松嫩平原西部的退化演替过程中形成了草地生态系统的不同植物群落，如羊草（Leymus chinensis）→虎尾草（Chloris virgata→PuccineIlia tenuiflora→Suaeda glauca），然后是盐碱地。实验地点位于中国最大的三大天然羊草草原之一的江家店草地上。时间序列方法（空间前向替代）是获得演替研究综合信息的可行工具，本研究的主要目的是确定退化演替对草地生态系统固碳的影响。在每个实验地点选择六个采样条（50cmx50cm）和四个剖面，以测量植物种类，覆盖率，地上生物量，土壤容重，总氮和土壤有机碳。结果表明，植物群落组成发生了变化，植物种类和被覆数量减少。此外，土壤有机碳与土壤水分和土壤总氮呈正相关（P <0.05），草地退化引起的退化演替不仅影响表层，还影响深层。这不是简单的碳源，适度的草地退化对碳储量有积极影响，而过度退化会加速草地碳储量的损失。

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