林业科学Issue(6)：115-124,10.DOI:10.11707/j.1001-7488.20140615
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
Effects of Nitrogen Addition on Chemical Composition of Soil Organic Carbon and Soil Microbial Community in a Young Ginkgo biloba Plantation
摘要
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 -2 a -1 N ) ,Low-N ( 50 kg·hm -2 a -1 N ) , Medium-N (100 kg·hm -2 a -1 N) and High-N (150 kg·hm -2 a -1 N) . 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.关键词
银杏/幼龄林/氮添加/土壤化学性质/土壤微生物群落Key words
Ginkgo biloba/young plantation/N addition/soil chemical properties/soil microbial community分类
农业科技引用本文复制引用
张晓文,邢世岩,吴岐奎,刘晓静..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[J].林业科学,2014,(6):115-124,10.基金项目
National Sci-Tech Support Plan，China (2012BAD21B04)． （2012BAD21B04）
