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Limiting factor of denitrification for accumulated nitrate in 0-12 m soil profiles

Limiting factor of denitrification for accumulated nitrate i...

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第七次全国土壤生物与生物化学学术研讨会暨第二次全国土壤健康学术研讨会

作者： Haijing Yuan Shuping Qin Wenxu Dong Chunsheng Hu Kiril Manevski Xiaoxin Li University of Chinese Academy of Sciences

Subsoil denitrification is an important mechanism to reduce nitrate leaching into groundwater. However, factors limiting subsoil denitrification, especially in the soil beneath the root zone, have not been well investigated. We collected intact soil columns of 0-12 m from fields in the North China Plain with long-term nitrogen(N) fertilization input of 0(N0), 200(N200) and 600(N600) kg N ha-1 yr-1. Within the 0-12 m soil profiles we determined physical properties and chemical properties related to denitrification, i.e. soil texture, water content, nitrate, dissolved organic carbon(DOC), soil organic carbon(SOC), denitrifying enzyme activity(DEA) and actual denitrification rate(ADR). The results showed that nitrate was heavily accumulated in the entire soil profile in N600, compared to N0 and N200. The SOC, DOC, and ADR decreased with increasing soil depth in all treatments, whereas considerable DEA was observed in the entire subsoil in N600 treatment when compared with N0 and N200. Long-term fertilizer rates only affected ADR in upper 4 m soil layers. The ADR in N200 and N600 was significantly correlated with DOC but not with DEA. These results implied on DOC rather than DEA as the key factor limiting denitrification beneath the root zone. Further study should investigate if importing DOC into subsoil could be a promising approach to increase denitrification and remove accumulated nitrate in subsoil and consequently to block nitrate contamination of the groundwater in intensive farming fields such as those studied here.

关键词： Subsoil denitrification Groundwater Nitrate contamination Dissolved organic carbon denitrifying enzyme activity Nitrate leaching

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