气象与环境学报2013，Vol.29Issue(4)：106-111,6.DOI:10.3969/j.issn.1673-503X.2013.04.017
冻融交替对河岸缓冲带土壤无机氮和土壤微生物量氮的影响
Effect of freezing-thawing on soil dissolved inorganic nitrogen and soil microbial biomass nitrogen in riparian zone
摘要
Abstract
Changes of intensity and frequency of soil freezing-thawing cycles are important factors affecting the N cycle in the riparian ecosystem in eastern mountain of Liaoning province.The freezing-thawing cycles could affect soil nitrogen cycles through microbial biomass and community.The study was carried out in Dahuofang experimental forest watershed.The effect mechanism of freezing-thawing cycles on inorganic nitrogen content of soil was revealed,which could provide the references for assessing the risk of N loss in the riparian ecosystem.The results show that soil inorganic nitrogen content is in an increasing trend with the increasing times of freezing-thawing cycles.Different freezing temperature has the significant effect on inorganic nitrogen.The inorganic nitrogen contents are 34.9 ±0.9 mg·kg-1 and 37.2 ±0.8 mg·kg-1 after 10 freezing-thawing cycles with the-5 ℃/+5 ℃ and -20 ℃/+ 5 ℃ treatments,which are 1.21 and 1.41 times of initial inorganic nitrogen content of soil samples,respectively.Furthermore,freezing-thawing cycles and its temperature difference have the significant effect on soil NH4+-N content (P ＜0.01).After 10 freezing-thawing cycles,soil NH4+-N content is 4-10 times of soil samples for + 5 ℃ treatment.Freezing-thawing cycles have the significant influences on soil NO3--N content (P ＜ 0.05),while its temperature difference has not the significant influences on NO3--N content (P ＞ 0.05).The response of soil microbial biomass nitrogen content to freezing-thawing cycles is significant(P ＜ 0.01).关键词
冻融交替/无机氮/土壤微生物量氮/河岸缓冲带/小流域Key words
Freezing-thawing change/ Inorganic nitrogen/ Microbial biomass nitrogen of soil/ Riparian zone/ Small watershed分类
农业科技引用本文复制引用
范志平,李胜男,李法云,高洪翠,闫加亮..冻融交替对河岸缓冲带土壤无机氮和土壤微生物量氮的影响[J].气象与环境学报,2013,29(4):106-111,6.基金项目
"十二五"国家科技支撑计划项目(2011BAD38B0502)、"十二五"国家重大科技水专项(2012ZX07505-001)和辽宁石油化工大学科技创新人才引进团队计划共同资助. （2011BAD38B0502）
