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Land consolidation has become a main means of achieving the intensive use of land resources, which ensures the dynamic equilibrium and requisition-compensation balance of the total cultivated land in China. However, the intensive disturbance during the land consolidation may affect the soil quality. In order to investigate the effect of land consolidation on soil microbial diversity, we studied the changes of soil microbial community diversity after 1-year and 4-year land conso-lidation by using PLFA method. The results indicated that compared with no consolidation (Z0), for land consolidation after 1a (Z1a), the soil pH value increased by 14.6%, the soil organic carbon content decreased by 65.4%, the phospholipid fatty acids content and relative abundance of all the microflora decreased significantly (P0.05) by 43.4%-63.7% and 25.2%-53.9%, respectively, and the ratio of fungi/bacteria (F/B) decreased significantly by 35.9% (P0.05), while the ratio of Gram-positive bacteria/Gram-negative bacteria (G土地整理保证了我国耕地总量的动态平衡和占补平衡,已成为实现国土资源集约利用的主要手段,但整治过程中的强度扰动会对土壤质量产生一定的影响.为了解土地整理对土壤微生物多样性的影响,采用PLFA法研究了土地整理1年(Z1a)、4年(Z4a)后土壤微生物群落多样性的变化.结果表明: 与未整理(Z0)相比,土地整理1年后,土壤pH值提高了14.6%,土壤有机碳质量分数降低了65.4%;各菌群磷脂脂肪酸PLFAs含量和相对丰度均显著下降(P0.05),下降幅度达43.4%～63.7%和25.2%～53.9%;真菌/细菌(F/B)显著下降(P0.05),降低了35.9%,而革兰氏阳性菌/革兰氏阴性菌(G |
