青藏高原三江源区不同恢复期高寒草甸土壤线虫群落演变
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Q14

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西藏大学高层次引进人才科研资助经费和西藏大学和复旦大学生物多样性与全球变化联合实验室经费项目资助。


Response of Soil Nematode Communities to Restoration of Alpine Meadow Grassland in Three-river Headwater Region on Qinghai-Tibet Plateau in Different Restoration Periods
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    摘要:

    青藏高原三江源地区的高寒草甸面临着严峻的退化问题,人工建植是三江源地区退化草地的重要修复方式。为探究地下生物对草地人工恢复措施的响应,本研究比较了三江源地区高寒草甸不同恢复期人工草地(建植1、5和10 a)的土壤线虫群落变化。结果显示:与原生植被样地相比,所有恢复期样地的植物地下生物量降低,土壤容重、pH、全磷、全钾和硝态氮含量升高,表明人工草地系统的初级生产力和土壤特性尚未恢复到原生草地状态。不同恢复期样地中土壤线虫的均匀度和多样性指数均显著高于原生植被样地。此外,不同恢复期样地的线虫多度、代谢足迹以及成熟度指数均随恢复年限的增加而增加。相关性分析结果表明,土壤线虫多度与植物地下生物量、土壤有机质、全氮、全磷、矿质氮和速效氮含量显著正相关(P<0.05),与土壤pH、全钾和容重显著负相关(P<0.05)。尽管三江源区退化草地的人工恢复措施尚未完全恢复牧草生产力至原生植被状态,但土壤生物结构及功能具有改善的趋势,显示该地区退化草地生态系统具有较强的恢复潜力。

    Abstract:

    Alpine meadow in the Three-River Headwater Region on the Qinghai-Tibet Plateau is undergoing severe degradation. Artificial planting is an important way to restore degraded grasslands. This study compares the structure and function of soil nematode communities of alpine meadow grasslands at different restoration stages (artificial grassland planting for 1, 5 and 10 years) to test the effectiveness of grassland restoration from the view of belowground. Compared with the native vegetation plots, plant belowground biomass of the restored plots is significantly lower, and soil bulk density, pH, total phosphorus, total potassium and nitrate nitrogen are significantly higher. Nematode evenness index and Shannon Wiener index in the three restoration plots are significantly higher than those in native vegetation plots. In addition, with the increase of restoration years, nematode abundance index, metabolic footprint index and maturity index in restoration plots are increased. Correlation analysis results show that soil nematode abundance is significantly positively correlated with plant belowground biomass, soil organic matter, total nitrogen, total phosphorus, mineral nitrogen and available nitrogen (P<0.05), and significantly negatively correlated with soil pH, total potassium and bulk density (P<0.05). Although the artificial restoration measures of the degraded grassland in the Three-River Headwater Region have not fully restored the forage productivity to the state of native vegetation, soil biological structure and function have a trend of improvement, indicating the strong restoration potential for the degraded grassland ecosystem in this area.

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吴雨薇,罗珊,拉琼,吴纪华.青藏高原三江源区不同恢复期高寒草甸土壤线虫群落演变[J].土壤,2022,54(3):532-538. WU Yuwei, LUO Shan, Laqiong, WU Jihua. Response of Soil Nematode Communities to Restoration of Alpine Meadow Grassland in Three-river Headwater Region on Qinghai-Tibet Plateau in Different Restoration Periods[J]. Soils,2022,54(3):532-538

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