Quantification of the effects of various soil fumigation treatments on nitrogen mineralization and nitrification in laboratory incubation and field studies

文献类型： 外文期刊

第一作者： Wang, Qiuxia

作者： Wang, Qiuxia;Mao, Liangang;Li, Wei;Xie, Hongwei;Guo, Meixia;Cao, Aocheng

作者机构：

关键词： chloropicrin;fumigation;mineral nitrogen;mineralization;nitrification inhibition

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

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收录情况： SCI

摘要： Better quantification of nitrogen mineralization and nitrification after fumigation would indicate if any adjustment is needed in fertilizer application. The effects of chloropicrin (Pic), 1,3-dichloropropene (1,3-D), dimethyl disulfide (DMDS) and metham sodium (MS) fumigation on soil nitrogen dynamics were evaluated in lab incubation and field studies. Although some differences were observed in NH_4-N and NO_3~-- N concentrations in lab incubation and field experiments, both studies led to the same conclusions: (1) Soil fumigation was shown to increase soil mineral nitrogen only during the first 2 weeks after fumigation (WAF). In particular, Pic significantly increased soil mineral nitrogen in both studies at 1 WAF. However, for all fumigant treatments the observed effect was temporary; the soil mineral content of treated samples recovered to the general level observed in the untreated control. (2) All the fumigation treatments depressed nitrification temporarily, although the treatments exhibited significant differences in the duration of nitrification inhibition. In both studies, for a limited period of time, Pic showed a stronger inhibitory effect on nitrification compared to other fumigant treatments. An S-shaped function was fitted to the concentrations of NO_3 N in lab incubation samples. The times of maximum nitrification (t_(max)) in DMDS and MS treatments were 0.97 week and 1.03 week, which is similar to the untreated control (t_(max)= 102 week). While Pic has the longest effect on nitrifying bacteria, nitrification appears to restart at a later time (t_(max) = 14.37 week).

分类号： X5

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