异翅独尾草不同年龄阶段根际与非根际土壤特征

Microbes,Enzyme Activities and Nutrient Characteristics of Rhizosphere and Non-rhizosphere Soil of Different Ages of Eremurus anisopterus

为了明确异翅独尾草根区微生物群落特征,研究了古尔班通古特沙漠南缘不同年龄阶段异翅独尾草根际土壤微生物数量、土壤酶活性和养分含量。结果表明:不同年龄阶段根际土壤微生物的含量与组成差异较大,衰老期微生物数量最多,衰老期养分的积累有利于微生物的生长。土壤中幼年期pH值、过氧化氢酶、蔗糖酶、中性磷酸酶,成熟期放线菌、速效磷、有机质,衰老期全钾、过氧化氢酶呈现根际负效应。其他各时期微生物数量、酶活性和养分含量均具有明显的根际聚集现象。根际土壤细菌、真菌、放线菌、脲酶、蔗糖酶、有机质、全氮、全磷和速效钾有很密切的相关性。表明不同年龄阶段的异翅独尾草均提高了土壤的有机质与养分含量,且根际土壤养分总量大于非根际土壤和裸地土壤,根际微生物促进了养分的积累,改善了沙漠土壤的质量。

To analyze the microbial community of Eremurus anisopterus rhizosphere soil,provide ecological evidence of the adaptability of Eremurus anisopterus to arid desert,and supply necessary ecological data for the protection and utilization of the plant,measurement and analysis of soil microbial quantity,soil enzyme activity and nutrient content of the different ages of Eremurus anisopterus in the southern Gurbantunggut Desert was conducted. The results showed that the content and composition of rhizosphere soil microbes differed greatly at different ages,and the aging stage had the largest number of microorganisms as well as nutrients that can be beneficial to the growth of microorganisms. pH,catalase,invertase,neutral phosphatase of young stage,actinomycetes,phosphorus,organic matter,the total K of aging stage in the soil suggested rhizosphere negative effect. The number of microorganisms,enzyme activity and nutrient content of the other stages had obvious rhizosphere aggregation. Rhizosphere soil bacteria,fungi,actinomycetes,urease,invertase,organic matter,total nitrogen,total phosphorus and potassium had close correlations. Eremurus anisopterus of different ages all increased soil organic matter and nutrients,and the total amount of soil nutrients of rhizosphere was greater than that of non-rhizosphere soil and bare soil,which has promoted the accumulation of nutrients and improved the quality of the desert soil.