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- Title
氮添加诱导的磷限制改变了亚热带黄山松林 土壤微生物群落结构.
- Authors
张晓晴; 曾泉鑫; 元晓春; 万晓华; 崔琚琰; 李文周; 林惠瑛; 谢欢; 陈文伟; 吴君梅; 陈岳民
- Abstract
Soil microorganisms play an important role in the biogeochemical cycles of terrestrial ecosystems. How-ever, it is still unclear how the amount and duration of nitrogen (N) addition affect soil microbial community structure and whether there is a correlation between the changes in microbial community structure and their nutrient limi-tation status. In this study, we conducted an N addition experiment in a subtropical Pinus taiwanensis forest to simulate N deposition with three treatments: control (CK, 0 kg N·hm-2·a-1), low N (LN, 40 kg N·hm-2·a-1), and high N (HN, 80 kg N·hm-2·a-1). Basic soil physicochemical properties, phospholipid fatty acids content, and carbon (C), N and phosphorus (P) acquisition enzyme activities were measured after one and three years of N addition. The relative nutrient limitation status of soil microorganisms was analyzed using ecological enzyme stoichiometry. The results showed that one-year N addition did not affect soil microbial community structure. Three-year LN treatment significantly increased the contents of Gram-positive bacteria (G+), Gram-negative bacteria (G-), actinomycetes (ACT), and total phospholipid fatty acids (TPLFA), whereas three-year HN treatment did not significantly affect soil microbial community, indicating that bacteria and ACT might be more sensitive to N addition. Nitrogen addition exacerbated soil C and P limitation. Phosphorus limitation was the optimal explanatory factor for the changes in soil microbial community structure. It suggested that P limitation induced by N addition might be more beneficial for the growth of certain oligotrophic bacteria (e.g. G+) and the microorganisms participating in the P cycling (e.g. ACT), with consequences on soil microbial community structure of subtropical Pinus taiwanensis forest.
- Subjects
BIOGEOCHEMICAL cycles; SOIL microbiology; MICROBIAL communities; GRAM-positive bacteria; SOIL microbial ecology; GRAM-negative bacteria; FOREST soils
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2023, Vol 34, Issue 1, p203
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.202301.042