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新型生态有机肥与牛粪对典型高寒草甸生态修复效果的对比研究

Comparative research on the restoration effects of new ecological restoration organic fertilizer and cattle manure on typical alpine meadow

  • 摘要: 以松潘县典型高山寒冷区退化草甸作为对象,通过对比传统牛粪有机肥和新型生态修复有机肥对退化草甸的修复结果,分析评估农业有机废弃物资源化产品—新型生态修复有机肥对高寒草甸修复的实际应用效果。结果表明:1)生态有机肥对草甸生态系统碳库改善效果普遍优于牛粪。施肥量750 kg·hm−2时,提升土壤有机碳的效果最优,比CK提高30.12%。施肥量1050 kg·hm−2时,对土壤有机碳储量的提升最优,比CK提高52.59%。施肥量450 kg·hm−2时,植物有机碳储量是CK的6.1倍。2)生态有机肥对植物生长和群落多样性的促进改善效果优于牛粪。施肥量1050 kg·hm−2时,植物平均盖度和高度达到最大,施肥量450 kg·hm−2时,地上生物量和地下生物量均处于较高水平,且根冠比合理。施肥量750 kg·hm−2时,既能维持植物群落内部物种组成的一致性,又实现多样性的提升。综合考虑,生态有机肥施肥量在750 kg·hm−2时,在促进植物生长发育、固碳增汇、维持群落多样性等方面达到了较好的平衡,可作为一种有效的人工修复方案应用于退化高寒草甸恢复。

     

    Abstract: The typical degraded alpine meadow in Songpan County was taken as the research object, and compared the restoration results of traditional cattle manure and new ecological organic fertilizer, to evaluate the effectiveness of the new ecological organic fertilizer on alpine meadow, which was a resource utilization product of agricultural organic waste. The results showed: 1) The ecological organic fertilizers were better than cow manure in improving the carbon pool of alpine meadow ecosystem. At the application of 750 kg·hm−2 of ecological organic fertilizer, the soil organic carbon increased by 30.12% relative to CK, which achieved optimal effect. And at the application of 1050 kg·hm−2, the soil organic carbon stock increased by 52.59%, and at the application of 450 kg·hm−2, the vegetation organic carbon stock reached 6.1 times that of CK. 2) The improvement effects of ecological organic fertilizer on plant growing and community diversity was better than that of cow manure. At the application of 1050 kg·hm−2, the average plant coverage and height showed optimal increases. And at the 450 kg·hm−2 ecological organic fertilizer addition, both aboveground and belowground biomass reached high levels with a reasonable root-to-shoot ratio. At the application of 750 kg·hm−2, the species composition consistency of plant communities were maintained while communities diversity were improved. Overall, when the application of ecological organic fertilizer was set at 750 kg·hm−2, a good balance was achieved in promoting plant growing, enhancing carbon sequestration and sink, and maintaining community diversity. This approach can serve as an effective artificial restoration strategy for the restoration of degraded alpine meadows.

     

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