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Deep soil microbial carbon use efficiency responds stronger to nitrogen deposition than top soil in tropical forests, southern China

文献类型： 外文期刊

作者： Jiang, Yamin 1 ; Su, Tianyan 1 ; Wang, Huafeng 2 ; Yang, Qiu 1 ; Lu, Jingli 1 ; Fu, Qunyou 1 ; Mao, Han 4 ; Xu, Wenxian 5 ; Luo, Yiqi 6 ; Liu, Wenjie 1 ; Yang, Huai 7 ; Fang, Mengyang 3 ;

作者机构： 1.Hainan Univ, Sch Ecol & Environm, Key Lab Agroforestry Environm Proc & Ecol Regulat, Haikou, Peoples R China

2.Hainan Univ, Sch Trop Agr & Forestry, Haikou, Peoples R China

3.Sanya Trop Ecosyst Carbon Source & Sink Field Sci, Sanya, Peoples R China

4.Lanzhou Univ, Coll Ecol, State Key Lab Grassland Agroecosyst, Lanzhou, Peoples R China

5.Chinese Acad Trop Agr Sci, Rubber Res Inst, Haikou, Peoples R China

6.Cornell Univ, Sch Integrat Plant Sci, Ithaca, NY USA

7.Inst Trop Bamboo, Int Ctr Bamboo & Rattan, Sanya Res Base, Rattan & Flower, Sanya, Peoples R China

关键词： CUE; Nitrogen addition; Labeled substrate; Phospholipid fatty acids; SIP-PLFA; Eco-enzymatic stoichiometric model

期刊名称：PLANT AND SOIL （ 影响因子：4.9； 五年影响因子：5.2 ）

ISSN： 0032-079X

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Background and aimsSoil microbial carbon use efficiency (CUE), a key parameter determining soil C fate, has been associated with soil nitrogen (N) availability. However, the responses of forest soil CUE to aggregated N deposition are not clear. Moreover, it remains unclear whether responses may be mediated by soil depth. It is crucial to investigate the patterns and drivers of CUE with N deposition in forest top and deep soil.MethodsThis study examined the responses of microbial CUE to short-term N addition treatments in the top (0-10 cm) and deep (60-80 cm) soils from two tropical forests in Hainan, southern China. Additionally, a meta-analysis was conducted to reveal a global pattern of forest soil microbial CUE response to N deposition.ResultsThe addition of N in the two tropical forests did not change topsoil CUE, whereas deep soil CUE increased by 25.5% (0.44 and 0.55 without and with N addition) on average. In the two soil depths, changes in CUE to N addition were negatively correlated with Fungi: Bacteria ratio (F: B). The negative relationship between resource limitation and CUE was found to be present with C limitation in top soil and N limitation in deep soil. N cycling enzyme activities played a vital role in regulating microbial resource limitation and CUE. The decrease in F: B and C: N ratios with the addition of N partly explained the stronger response of CUE in deep soil. At the global scale, the addition of N had no effect on the forest top soil CUE. However, the significant decline in pH and microbial biomass carbon with N deposition could reduce microbial CUE.ConclusionThe addition of N facilitated carbon storage in deep soil but had no effects on topsoil carbon storage in a tropical forest. Our results highlighted that the soil depth-driven variation in soil C: N and F: B can regulate microbial CUE, which could provide a basis for understanding the soil C cycle in tropical forest ecosystems.

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