Vegetation Restoration Alters the Diversity and Community Composition of Soil Nitrogen-Fixing Microorganisms in the Loess Hilly Region of China
| Autor: | Gaihe Yang, Yinyue Dai, Zekun Zhong, Wenjing Qiao, Chengjie Ren, Xinhui Han, Zhengxing Chen, Wei Zhang, Shujuan Guo, Yadong Xu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
biology
Robinia Soil Science 04 agricultural and veterinary sciences Vegetation Soil carbon 010501 environmental sciences biology.organism_classification 01 natural sciences Actinobacteria Diversity index Agronomy Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Species richness Revegetation 0105 earth and related environmental sciences |
| Zdroj: | Soil Science Society of America Journal. 83:1378-1386 |
| ISSN: | 0361-5995 |
| DOI: | 10.2136/sssaj2019.03.0066 |
| Popis: | In this study, we determined the variations in the diversity and structure of nitrogen-fixing microorganisms during afforestation and how this variability correlates with the soil physicochemical factors. Soils were sampled from replicated plots representing three revegetation types (Robinia pseudoacacia L. [Rp], Caragana korshinskii Kom [Ck], and abandoned land) with adjacent farmland as the control at a research site in Ansai District, Yan’an City, Shaanxi Province, China. Using high-throughput sequencing of the nifH rRNA gene, we found that revegetation significantly increased the Shannon diversity index, and for the richness index Chao1 was highest in Ck and have no significant difference in other three lands. From farmland to vegetation types abandoned land, Ck, and Rp, the dominant phylum of nifH microorganisms changed from Actinobacteria to Proteobacteria. Furthormore, variation in the Chao1 richness index was significantly influenced by pH (p = 0.002), soil organic carbon (SOC; p = 0.025) and total nitrogen (TN; p = 0.015). The Shannon diversity index was significantly influenced by SOC, nitrate nitrogen (NN), C to P ratio, TN, AN, N to P ratio, TP, and sand. The changes of nifH microorganism composition at the phylum level were significantly correlated with the soil N to P ratio, which explained 53.1% of the variation among environmental factors (F = 11.8, p = 0.002). The ratio of N to P (interpretation rate 65.2%, F = 18.8, p = 0.002) was also a key factor that influenced the composition at the genus level. Based on the diversity and composition, Ck was a more advantageous recovery method to increase the capacity for N fixation. This study provides a basis for the study of N-fixation characteristics in the Loess Hilly Region. |
| Databáze: | OpenAIRE |
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