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Effects of forest conversion on soil microbial community structure(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2019 01
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Effects of forest conversion on soil microbial community structure
CHU Haiyan1 LI Ruonan1 LI Jingwen1 ZHONG Zhaoquan3 LIU Xiaofei1 2 & LI Yiqing1 2**
1 School of Geography Sciences, Fujian Normal University, Fuzhou 350000, China 2 National Key Laboratory of Humid Subtropical Mountain Ecology Foundation, Fujian Normal University, Fuzhou 350007, China 3 Shunchang Forestry Bureau, Nanping City, Fujian Province, Nanping 353000, China
forest conversion soil microbial community structure PLFA soil nutrient

Forest conversion is an important way of land-use change, which changes soil ecosystem by changing forest vegetation type. Soil microorganisms are an important component of soil ecosystem, and its change is closely related to the improvement of soil fertility. In this study, the phospholipid fatty acid method was used to determine the soil microcommunity structure, soil nutrients, and the relationship between the evergreen broad-leaved natural secondary forest and Chinese fir plantation in Wufang forest farm in Shunchang County, Nanping City. The results showed that the total carbon content, total phosphorus content, ammonium nitrogen, microbial biomass carbon, and C/N ratio of the evergreen broad-leaved natural secondary forest were significantly higher than those of the Chinese fir plantation (P < 0.05), but no significant difference was observed in the total nitrogen content and available phosphorus content between the two stands (P > 0.05). The gram-positive bacteria, fungus, total phospholipid fatty acid (total PLFAs), gram-positive/gram-negative bacterial ratio (G+:G-) and fungal/bacterial (F:B) ratio of evergreen broad-leaved natural secondary forest were significantly higher than that of Chinese fir plantation. A Pearson correlation analysis showed that bacteria, fungi, and total PLFAs were significantly correlated with total carbon, total phosphorus, ammonium nitrogen and microbial biomass carbon content, and total phospholipid fatty acids were significantly correlated with pH (P > 0.05). A principal component analysis showed that the first and second principal components together explained 97.86% of the changes in microbial community structure, indicating significant differences in soil microbial community structure among different forest stands after forest conversion. A redundancy analysis showed that the first and second axes explained 89.9% and 6.7% respectively. Soil total phosphorus, ammonium nitrogen, and nitrate nitrogen had the greatest impact on soil microbial community structure. The results showed a significant correlation between soil microbial community structure and soil nutrient content under forest conversion, which was of important reference value for improving soil fertility and building sustainable Chinese fir plantation.


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Last Update: 2019-02-25