Effect of land use on the denitrification, abundance of denitrifiers, and total nitrogen gas production in the subtropical region of China

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• 作者：Yongjie Yu (1)
  Jinbo Zhang (1)
  Wenwen Chen (1)
  Wenhui Zhong (1)
  Tongbin Zhu (1)
  Zucong Cai (1)
  
• 关键词：Denitrification ; narG ; nirK ; norB ; nosZ ; Subtropical soil ; Soil pH ; Total N gas production
• 刊名：Biology and Fertility of Soils
• 出版年：2014
• 出版时间：January 2014
• 年：2014
• 卷：50
• 期：1
• 页码：105-113
• 全文大小：285 KB
• 作者单位：Yongjie Yu (1)
  Jinbo Zhang (1)
  Wenwen Chen (1)
  Wenhui Zhong (1)
  Tongbin Zhu (1)
  Zucong Cai (1)
  
  1. School of Geography Sciences, Nanjing Normal University, Nanjing, 210023, China
  
• ISSN：1432-0789

文摘

The potential denitrification (PD) rate, NO, N2O, and N2 emission were determined after treatment with 50?mg NO3 ?/sup>?N?kg? soil using the acetylene inhibition method, and meanwhile abundance of four denitrifying genes (i.e., narG, nirK, norB, nosZ) was also investigated in subtropical soils of China. Soil samples were collected from conifer forest (C), shrub forest, and farmland. These soils were derived from Quaternary red earth and granite. The PD rate and N gas emissions significantly (p-lt;-.05) differed between forest and farmland soils; abundance of denitrifying genes was also significantly affected by the land-use change. Correlation and multiple stepwise regression analyses showed that the PD rate was significantly (p-lt;-.05) and positively correlated with soil pH but not with soil organic C and total N contents (p-gt;-.05). The norB gene copies in farmland soils were significantly higher than in conifer and shrub forest soils (p-lt;-.01). Both norB and nosZ gene copies were linearly correlated with soil pH, and the PD rate and N2 emission rate were significantly correlated with the abundance of norB (p-lt;-.05). Probably, soil pH affected denitrifiers targeted by the norB gene, thus decreasing the reduction of NO and N2O.