Abstract:The nitrification process of salt-affected soil was studied through a laboratory incubation experiment at three soil moisture levels(50%, 75% and 100% of field capacity(FC))and four salinity levels(0.8, 3.0, 6.0 and 15.0 g/kg). The results showed that the NH+4-N consumption rates and the NO-3-N production rates increas significantly with increasing soil moisture, and ammonia oxidation and nitrite oxidation are promoted at higher soil moistures(75%FC and 100%FC)compared with 50%FC. In 3.0 and 6.0 g/kg treatments, the inhibition of soil salinity on nitrite oxidation is significantly stronger than that of ammonia oxidation, which accounts for NO-2-N accumulation. However, in 15.0 g/kg treatment, changes in the concentration of NH+4-N, NO-3-N and NO-2-N all remain at a low level, and a high soil salinity seriously inhibits both ammonia oxidation and nitrite oxidation. The non-synchronous response of ammonia oxidation and nitrite oxidation to soil salinity significantly affects the forms and transformation process of inorganic nitrogen in soil.
李亚威,, 徐俊增,, 卫琦,, 百文焕,, 李坤霖,, 刘笑吟,*. 不同水盐条件下盐渍土硝化过程特征[J]. 排灌机械工程学报, 2018, 36(9): 909-913.
LI Yawei,, XU Junzeng,, WEI Qi,, BAI Wenhuan,, LI Kunlin,, LIU Xiaoyin,*. Soil nitrification process under different soil moisture and salinity conditions. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(9): 909-913.
[1]郭全恩,王益权,南丽丽, 等. 溶质类型与矿化度对半干旱盐渍化地区果园土壤水分有效性的影响[J]. 中国生态农业学报,2013,21(8): 973-978. GUO Quanen,WANG Yiquan,NAN Lili,et al. Effect of solute type and salinity on soil water availability in orchards in saline semiarid regions[J]. Chinese journal of eco-agriculture,2013,21(8): 973-978.(in Chinese)[2]RATH K M, MAHESHWARI A, ROUSK J. The impact of salinity on the microbial response to drying and rewetting in soil [J]. Soil biology and biochemistry,2017,108: 17-26.[3]CANTERA J J L,JORDAN F L,STEIN L Y. Effects of irrigation sources on ammonia-oxidizing bacterial communities in a managed turf-covered aridisol[J]. Biology and fertility of soils,2006,43: 247-255.[4]李建兵,黄冠华. 盐分对粉壤土氮转化的影响[J]. 环境科学研究,2008,21(5): 98-103. LI Jianbing,HUANG Guanhua. Pilot study of salinity(NaCl)affecting nitrogen transformation in silt loam soil[J]. Research of environmental sciences,2008,21(5): 98-103.(in Chinese)[5]闵伟,侯振安,梁永超,等. 土壤盐度和施氮量对灰漠土尿素N转化的影响[J]. 土壤通报,2012,43(6): 1372-1379. MIN Wei,HOU Zhen′an,LIANG Yongchao,et al. Effect of soil salinity level and nitrogen rate on Urea-N transformation in grey desert soil[J]. Chinese journal of soil science,2012,43(6):1372-1379.(in Chinese)[6]HU H W,MACDONALD C A,TRIVEDI P,et al. Water addition regulates the metabolic activity of ammonia oxidizers responding to environmental perturbations in dry subhumid ecosystems[J]. Environmental microbiology,2015,17(2):444-461.[7]赵伟. 盐度对污水SBR法脱氮效能及N2O释放特性的影响及机理[D]. 上海: 同济大学, 2014.[8]AKHTAR M,HUSSAIN F, ASHRAF M Y, et al. Influence of salinity on nitrogen transformations in soil[J]. Communications in soil science and plant analysis,2012,43:1674-1683.