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科尔沁不同退化类型草原土壤微生物的群落结构特征

Characteristics of Soil Microorganisms and Influencing Factors in Different Degradation Types of Grasslands in the Horqin Region

  • 摘要: 以科尔沁退化草原为研究对象,采用磷脂脂肪酸(PLFA)标记法与土壤因子结合,探究健康草原(CK)、轻度沙化草原(TH)、中度沙化草原(SH)、中度盐渍化草原(MH)、重度盐渍化草原(ZH)土壤微生物特征及其调控因子。结果表明:5种不同退化类型草原土壤微生物PLFA的种类和含量存在差异,共检测到38种PLFA生物标记,其中有30种完全分布,8种不完全分布,土壤中微生物总量呈现CK>SH>TH>MH>ZH趋势。TH、SH和ZH土壤微生物群落结构相似度高,而CK和MH土壤微生物群落结构相似度低。5种不同退化类型草原土壤中PLFA总量、革兰氏阳性菌(G+)、革兰氏阴性菌(G)、其他细菌、真菌、放线菌与土壤全磷、全氮、有机碳、硝态氮、铵态氮呈极显著正相关,与pH呈极显著负相关。

     

    Abstract: Taking the degraded grasslands of the Horqin region as the research object, this study combined phospholipid fatty acid (PLFA) analysis with soil factors to investigate the characteristics and regulatory factors of soil microbial communities in Healthy grassland (CK), Mildly desertified grassland (TH), Moderately desertified grassland (SH), Moderately salinized grassland(MH), and Severely salinized grassland(ZH). The results showed that both the types and contents of PLFA biomarkers varied among the five types of degraded grasslands. A total of 38 PLFA biomarkers were detected, of which 30 were ubiquitously distributed and 8 were partially distributed. The total microbial biomass in soil showed a decreasing trend in the order: CK>SH>TH>MH>ZH. The microbial community structures of TH, SH, and ZH were highly similar, while those of CK and MH showed low similarity. The total PLFA content, Gram-positive bacteria(G+), Gram-negative bacteria(G), other bacteria, fungi, and actinomycetes in soils of the five grassland types were significantly positively correlated with TP, TN, SOC, NO3-N, and NH4+-N, and significantly negatively correlated with soil pH.

     

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