氮添加对银杏幼林土壤有机碳化学组成及土壤微生物群落的影响

doi:10.11707/j.1001-7488.20140615

Abstract

Abstract: To determine the effects of nitrogen deposition on chemical composition of soil organic carbon (SOC) and microbial community characteristics in a young subtropical plantation, a field N addition experiment was established in a young plantation of Ginkgo biloba in China. The experiment was conducted from May 2012 to May 2013 by bimonthly application of ammonia nitrate solution with four treatments: Control (0 kg·hm^-2a^-1N), Low-N (50 kg·hm^-2a^-1N), Medium-N (100 kg·hm^-2a^-1N) and High-N (150 kg·hm^-2a^-1N). High-N treatment significantly decreased soil organic carbon (SOC) concentration and the proportion of O-alkyl but increased Alkyl:O-alkyl ratio. Moreover, N addition significantly affected soil microbial biomass and altered differentially soil microbial community composition with the amount of N loaded. Medium-N and High-N treatments significantly decreased microbial biomass carbon (C) concentration but increased microbial biomass nitrogen (N) concentration. Besides, Medium-N and High-N treatments significantly decreased soil total microbial biomass, fungal biomass, and bacterial biomass. Additionally, Medium-N and High-N treatments significantly decreased the relative abundance of Gram-positive bacterial PLFAs and increased fungal: bacterial ratio as well as the relative abundance of actinomycetes PLFAs. Furthermore, High-N treatment significantly decreased soil pH, and soil respiration. Our results suggest that increased nitrogen deposition could significantly affect soil microbial biomass and community composition with the alterations of some soil chemical properties in the studied young plantation of G.biloba. This study could provide important scientific reference for the mechanism of soil microbial response to nitrogen deposition in young G.biloba plantations of subtropical China.

Key words: Ginkgo biloba, young plantation, N addition, soil chemical properties, soil microbial community

CLC Number:

S714
Q938.1

Zhang Xiaowen, Xing Shiyan, Wu Qikui, Liu Xiaojing. Effects of Nitrogen Addition on Chemical Composition of Soil Organic Carbon and Soil Microbial Community in a Young Ginkgo biloba Plantation[J]. Scientia Silvae Sinicae, 2014, 50(6): 115-124.

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Effects of Nitrogen Addition on Chemical Composition of Soil Organic Carbon and Soil Microbial Community in a Young Ginkgo biloba Plantation

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