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Nitrous oxide emission rates of saline soils in Yellow River Delta of China under different water and N amendment conditions.

ZHANG Jin-feng1, 2**, LI Zeng-jia3   

  1. (1School of Environmental Science and Engineering, Sun YatSen University, Guangzhou 510275, China; 2College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China; 3State Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University, Taian 271018, Shandong, China)
  • Online:2013-07-10 Published:2013-07-10

Abstract: A laboratory incubation was conducted to investigate the N2O emission rates of saline soils collected from the Yellow River Delta of China under different water and N treatments. For the soils with the salinity from ECe = 6.4 mS·cm-1 to ECe = 126.5 mS·cm-1, their N2O emission rates under different water conditions (50% WHC, 80% WHC, and 4 cm water depth) and without N amendment were very low, often below the detection limit. After applying 0.4 mg N·g-1 soil of NH4NO3, the N2O emission rate of sandy moderately saline soil at 50% WHC and at 4 cm water depth was 41.0 μg N2O·kg-1 soil·d-1 and 364.6 μg N2O·kg-1 soil·d-1, respectively, being comparable to that of non-saline soils under the similar conditions, and the N2O emission rate of sandy strongly and extremely saline soils was 43%-65% and 23%-48% of that of sandy moderately saline soil, respectively. By contrast, the N2O emission rate of Namended loamy saline soils was very low, from 0.91 to 37.1 μg N2O·kg-1 soil·d-1. The  high potential of N2O production and its strong dependence on nitrogen amendment and soil texture in saline soils suggested that the effects of soil salinity on N2O emission were mainly controlled by the limitation of C and N supply rather than the microbial factors.

Key words: leaf economics spectrum, plant functional type, functional trait.