巴音布鲁克高寒草原不同退化阶段土壤养分的变化

发布时间：2018-05-05 20:54

本文选题：退化演替 + 高寒草原　；参考：《新疆农业科学》2017年05期

【摘要】：【目的】研究巴音布鲁克高寒草原退化草地土壤理化性状、土壤养分特征,为退化草地合理利用提供理论依据。【方法】采用常规土壤理化性质测定方法,对巴音布鲁克高寒草原退化草地土壤有机碳、全氮、全磷、全钾、碱解氮、速效磷、速效钾、土壤水分及容重等特征进行分析。【结果】随着草地退化程度的加剧,土壤各层(0~30 cm)有机碳、全氮、全磷、碱解氮、速效磷、含水量均呈下降趋势;而容重和pH值呈增加趋势;与未退化草地相比,重度退化草地土壤各层(0~30 cm)有机碳、全氮、全磷、碱解氮、速效磷和含水量分别降低了25.22%~31.96%、37.69%~48.44%、28.00%~30.24%、35.53%~52.47%、33.89%~44.84%和35.44%~57.62%;重度退化草地20~30 cm土层速效钾含量显著高于未退化草地,是未退化草地的1.96倍;全钾含量对退化程度的响应不明显(P0.05)。【结论】巴音布鲁克高寒草原不同退化草地土壤养分含量明显下降。
[Abstract]:[objective] to study the soil physical and chemical properties and soil nutrient characteristics of degraded grassland in Bayinbrook alpine steppe, so as to provide theoretical basis for rational utilization of degraded grassland. [methods] conventional methods for the determination of soil physical and chemical properties were used. The characteristics of soil organic carbon, total nitrogen, total phosphorus, total potassium, alkali-hydrolyzed nitrogen, available phosphorus, available potassium, soil moisture and bulk density of degraded grassland in Bayinbrook alpine grassland were analyzed. Soil organic carbon, total nitrogen, total phosphorus, alkali-hydrolyzed nitrogen, available phosphorus, and water content all showed a downward trend, while bulk density and pH value increased, compared with undegraded grassland, the soil layers of severe degraded grassland showed 30 cm) organic carbon, total nitrogen, total phosphorus, total nitrogen, total phosphorus. The alkali-hydrolyzed nitrogen, available phosphorus and water content were reduced by 25.22U 31.96 and 37.690.48.440.28.240.453.530.54.84% and 35.447.62cm respectively, and the available potassium content in 2030cm soil layer of severely degraded grassland was significantly higher than that of undegraded grassland, 1.96 times of that of undegraded grassland, and the content of available potassium was 54.84% and 35.447.62cm in the soil layer of severely degraded grassland, which was significantly higher than that of undegraded grassland. The response of total potassium content to degradation degree was not obvious (P 0.05). [conclusion] the soil nutrient content of different degraded grassland in Bayinbrook alpine steppe decreased obviously.
【作者单位】：新疆农业大学草业与环境科学学院/新疆草地资源与生态重点实验室;
【基金】：国家自然科学基金项目“巴音布鲁克高寒湿地CO_2和CH_4排放对水分变化的响应(41305136)”~~
【分类号】：S812.2

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