草原
微生物种群生物学
生物
生态学
表土
群落结构
土壤微生物学
生态系统
草原
丰度(生态学)
微生物生态学
植物群落
物种丰富度
土壤水分
细菌
遗传学
作者
Xiongkui Lin,Wang Bo,Xudong Wu,Jing Liu,Zihao Zhang,Lingfei Xiang,Zhigang Li
摘要
Context Although nitrogen (N) deposition application has resulted in excess N entering grassland ecosystems, our understanding of how short-term N enrichment affects soil microbial community in a desert steppe is incomplete. Aims This study assessed the effects of 2 years of N addition on structure and function of soil microbial community at the soil depth of 0–10 cm in a desert steppe. Methods Six addition rates of N (equivalent to 0, 5, 10, 15, 20 and 40 g N m−2 year−1) were applied in a desert steppe of northern China, and the 16S rRNA and ITS1 genes were sequenced for the prokaryotic and fungal communities, respectively. Key results N addition altered prokaryotic taxa composition, but not fungal taxa composition and α-diversities of prokaryotic and fungal communities. N shifted microbial β-diversities, and prokaryotic β-diversity was more sensitive than fungal β-diversity. Abundances of predicted prokaryotic functions decreased as N rates increased, whereas predicted fungal functions presented no obvious variations among N additions. Predicted enzyme activities related to N cycling in prokaryotes were similar to fungi, but variations of C and P cycling-related enzyme activities were opposite to fungi. Additionally, phylum abundance, α-diversity, and β-diversity of prokaryotes were more closely influenced by soil and plant properties than fungi. Conclusions Two years of N addition altered both microbial community structure and function, but the prokaryotic community responded more sensitive than the fungal community. Implications Topsoil should be considered when exploring the impact of short-term N addition on soil microbial community in the desert steppe.
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