Reductive soil disinfestation (RSD) alters gross N transformation rates and reduces NO and N2O emissions in degraded vegetable soils
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- 作者：Tongbin Zhu ; Qi Dang ; Jinbo Zhang ; Christoph Müller ; Zucong Cai
- 关键词：Degraded vegetable soil ; Reductive soil disinfestations ; Gross N transformations ; NO ; N2O
- 刊名：Plant and Soil
- 出版年：2014
- 出版时间：September 2014
- 年：2014
- 卷：382
- 期：1-2
- 页码：269-280
- 全文大小：481 KB
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Qi Dang (2)
Jinbo Zhang (1)
Christoph Müller (4)
Zucong Cai (1)
1. School of Geography Sciences, Nanjing Normal University, Nanjing, 210097, China
2. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
3. Jiangsu Key Laboratory of Environmental Change & Ecological Construction, Nanjing Normal University, Nanjing, 210097, China
4. Department of Plant Ecology, Justus-Liebig University Giessen, Heinrich-Buff-Ring 26, 35392, Giessen, Germany - ISSN：1573-5036
文摘
Background and aims Continuous vegetable cultivation in greenhouses can easily induce soil degradation, which considerably affects the development of sustainable vegetable production. Recently, the reductive soil disinfestation (RSD) is widely used as an alternative to chemical soil disinfestations to improve degraded greenhouse vegetable soils. Considering the importance of nitrogen (N) for plant growth and environment effect, the internal N transformation processes and rates should be well investigated in degraded vegetable soils treated by RSD, but few works have been undertaken. Methods Three RSD-treated and three untreated degraded vegetable soils were chosen and a 15?N tracing incubation experiment differentially labeled with 15NH4NO3 or NH4 15NO3 was conducted at 25?°C under 50?% water holding capacity (WHC) for 96?h. Soil gross N transformation rates were calculated using a 15?N tracing model combined with Markov Chain Monte Carlo Metropolis algorithm (Müller et al. 2007), while the emissions of N2O and NO were also measured. Results RSD could significantly enhance the soil microbial NH4 + immobilization rate, the heterotrophic and autotrophic nitrification rates, and the NO3 ?/sup> turnover time. The ratio of heterotrophic nitrification to total inorganic N supply rate (mineralization + heterotrophic nitrification) increased greatly from 5.4?% in untreated vegetable soil to 56.1?% in treated vegetable soil. In addition, low release potential of NO and N2O was observed in RSD-treated vegetable soil, due to the decrease in the NO and N2O product ratios from heterotrophic and autotrophic nitrifications. These significant differences in gross N transformation rates, the supply processes and capacity of inorganic N, and the NO and N2O emissions between untreated and treated vegetable soils could be explained by the elimination of accumulated NO3 ?/sup>, increased pH, and decreased electrical conductivity (EC) caused by RSD. Noticeably, the NO3 ?/sup> consumption rates were still significantly lower than the NO3 ?/sup> production rates in RSD-treated vegetable soil. Conclusions Except for improving soil chemical properties, RSD could significantly alter the supply processes of inorganic N and reduce the release potential of N2O and NO in RSD-treated degraded vegetable soil. In order to retard the re-occurrence of NO3 ?/sup> accumulation, acidification and salinization and to promote the long-term productivity of greenhouse vegetable fields, the rational use of N fertilizer should be paid great attention to farmers in vegetable cultivation.