库布齐沙地两种植被恢复类型根际土壤微生物群落功能多样性研究

发布时间：2018-04-05 06:57

本文选题：植被恢复　切入点：土壤微生物　出处：《草业学报》2016年10期

【摘要】：为研究库布齐沙地生态恢复过程中不同植被恢复类型对土壤微生物群落功能多样性的影响,采用BiologECO微平板检测法,对库布齐沙地自然恢复19年的油蒿群落、人工种植19年的中间锦鸡儿群落土壤微生物群落功能多样性进行研究。结果表明:1)土壤微生物群落利用全部碳源的代谢活性和土壤微生物功能多样性指数均表现为两种植被恢复类型显著高于流沙对照,其中,自然恢复的油蒿群落根际、非根际土壤分别高于人工种植的中间锦鸡儿群落根际和非根际土壤;2)随着植被恢复,从流沙对照土壤微生物以氨基酸类、胺类和芳香类为主要碳源,转为主要利用糖类、羧酸类、多聚物类碳源。不同植被恢复类型对碳源的利用不同,油蒿群落以糖类、羧酸类、多聚物类为主要利用碳源,中间锦鸡儿群落以羧酸类、氨基酸类和胺类为主要利用碳源;3)主成分分析表明,不同植被恢复类型土壤微生物碳源利用特征出现分异,在主成分分离中主要贡献者是糖类碳源;4)土壤氮素含量与土壤微生物群落功能多样性密切相关。冗余分析表明,土壤有机质、全氮、速效钾、速效氮、pH和全磷是土壤微生物群落利用碳源的主要控制因子。综合分析认为,植被恢复改变了沙地土壤微生物群落结构和功能多样性,自然恢复的油蒿群落更有利于增加利用多类碳源的微生物种群,在提高微生物利用碳源的整体代谢活性方面具有显著优势。
[Abstract]:As in the process of different vegetation types on soil microbial community functional diversity effects of Kubuqi Desert Ecological Restoration, using BiologECO micro plate assay, the natural recovery of Artemisia ordosica community in Kubuqi Desert for 19 years, the artificial cultivation of Caragana intermedia community soil microbial community functional diversity of 19 years. The results showed that: 1) the soil microbial community using all carbon source metabolic activity and soil microbial functional diversity index were two vegetation restoration types were significantly higher than that of control, the natural recovery of quicksand, Artemisia ordosica communities in rhizosphere and non rhizosphere soil were higher than that of the artificial cultivation of Caragana intermedia community in rhizosphere and non rhizosphere soil; 2) with vegetation restoration, soil microbial control from sand to amino acids, amines and aromatic compounds as the main carbon source to mainly use carbohydrates, carboxylic acids, polymers of carbon source. The same type of vegetation restoration using different carbon sources, Artemisia ordosica community based on carbohydrate, carboxylic acids, polymers as the main carbon source utilization, Caragana intermedia community with carboxylic acids, amino acids and amines as the main carbon source utilization; 3) principal component analysis showed that the characteristics of differentiation of soil microbial carbon source different vegetation restoration types, the principal component in the separation of the main contributors is carbohydrate carbon sources; 4) the diversity of nitrogen content and soil microbial communities in soil is closely related to the function. The redundancy analysis showed that soil organic matter, total nitrogen, available potassium, available nitrogen, total phosphorus and pH is the main control factor of soil microbial utilization of carbon source. Comprehensive analysis shows that the vegetation restoration changed sandy soil microbial community structure and function diversity, more conducive to the natural recovery of Artemisia ordosica community increased by microbial population many kinds of carbon sources, improve the microbial utilization of carbon sources in the whole There is a significant advantage in body metabolism activity.

【作者单位】：中国农业科学院草原研究所;农业部牧草资源与利用重点实验室;
【基金】：中央级公益性科研院所基本科研业务费专项资金项目(1610332014026) 国家重点基础研究发展计划(973计划)(2014CB138806)资助
【分类号】：S154.3

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