南京林业大学学报(自然科学版) ›› 2017, Vol. 60 ›› Issue (01): 82-88.doi: 10.3969/j.issn.1000-2006.2017.01.013

• 研究论文 • 上一篇    下一篇

氮肥对毛竹林土壤硝化和反硝化作用的影响

刘琦蕊,漆良华*,胡 璇,张 宇   

  1. 国际竹藤中心,北京 100102
  • 出版日期:2017-02-18 发布日期:2017-02-18
  • 基金资助:
    基金项目:国家林业局“948”项目(2013-4-55)
    第一作者:刘琦蕊(qr129@126.com)。*通信作者:漆良华(qlh@icbr.ac.cn),研究员。

Effects of nitrogen fertilization on nitrification and denitrification in Phyllostachys edulis forests

LIU Qirui, QI Lianghua*, HU Xuan, ZHANG Yu   

  1. International Centre for Bamboo and Rattan, Beijing 100102, China
  • Online:2017-02-18 Published:2017-02-18

摘要: 【目的】探究氮肥对毛竹林土壤硝化和反硝化作用的影响,并分析其与主要土壤因子的相关关系,为毛竹林的抚育管理及可持续经营提供理论依据。【方法】以不施氮肥毛竹林为对照,应用气压过程分离(BaPS)方法,分季节测定施氮肥条件下毛竹林土壤总硝化和反硝化速率。【结果】施氮肥条件下毛竹林土壤总硝化和反硝化速率从春季到冬季变化规律相似,均呈现先升高后降低趋势,施肥毛竹林土壤总硝化和反硝化速率均以7月最高,当月相比分别比未施肥毛竹林高27.50%和44.60%; 最低值分别出现在1月和10月,当月相比分别比未施肥毛竹林高45.58%和402.56%。【结论】施氮肥可以促进毛竹林土壤硝化和反硝化作用,提高土壤硝态氮和微生物生物量氮含量,氮肥和季节对总硝化和反硝化速率存在显著交互作用,土壤温度、含水率与土壤总硝化、反硝化速率均呈显著正相关。

Abstract: 【Objective】In order to provide a theoretical basis for the cultivation and sustainable management of Phyllostachys edulis forests, the effects of nitrogen fertilization on nitrification and denitrification in Ph. edulis forests were explored, and the correlation between nitrogen transformation rates and main soil factors was analyzed.【Method】The gross nitrification rate and denitrification rate of fertilized Phyllostachys edulis forests were determined in different seasons(April, July, October and January in the following year)by using the measure named barometric process separation(BaPS). 【Result】The gross nitrification rate and the denitrification rate of fertilized forests had similar seasonal dynamics, increasing first and then decreasing. The gross nitrification rate and the denitrification rate of fertilized forests were the highest in July, they were 27.50% and 44.60% higher than that of unfertilized treatment respectively. The gross nitrification rate and the denitrification rate of fertilized forests were the lowest in January and October, they were 45.58% and 402.56% higher than that of unfertilized treatment respectively.【Conclusion】 Nitrogen fertilization could promote soil nitrification and denitrification, and increased soil nitrate concentration and microbial biomass nitrogen. There were significant interactions between nitrogen fertilization and season on nitrification and denitrification. Soil temperature and moisture correlated positively and significantly with the two transformation rates.

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