The Effect of Drying-Rewetting on Soil Nitrogen Nitrification

Abstract

More frequently drying-rewetting is likely to be expected for soils this century, with strong effect on nitrogen transformation. Experiments were conducted in semi-disturbed soils which were incubated under 4 different moisture regimes (dry wet\constant wet\constant dry\constant flooded) for 71 d. The results show that the dry soil has a rapid NO3--N increase after rewetting. Drying-rewetting increases soil nitrification which shows a "pulse" increasing. The drying and rewetting soil has the highest nitrification intensity when the soil moisture content (g/g) ranging at 15.82% ~ 17.06%. Drying-rewetting contributes to the accumulation of NO3--N.

Influence of drought and dry-wet alternation on nitrogen transformation and low abundance microorganisms in tea garden soil

“…1c), which might be attributed to depletion of soil nutrients during the entire cultivation period that promoted the death of microorganisms and decreased the ability of organic + nitrogen to transform into NH -N. Simultaneously, under the 4 combined action of ammonia volatilization and nitrification, the + NH -N content was consumed rapidly and the accumulation of 4 net nitrogen mineralization was reduced (Marcos et al, 2016;Francisco et al, 2011). In dry-wet alternation mode, the soil net mineralization showed a "pulsing" change trend, but the overall + trend was downward, and the soil NH -N content did not 4 effectively accumulate (Zheng et al, 2012).…”