Effect of different land uses on soil nitrogen mineralization in a coastal area of northern Jiangsu province, China, in winter

doi:10.3969/j.issn.1000-2006.2014.01.008

CHEN Shuxin,WANG Guobing,RUAN Honghua,YUE Zhen,XU Changbai,XU Yaming

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2014, Vol. 38 ›› Issue (01) : 41-46.

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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2014, Vol. 38 ›› Issue (01) : 41-46. DOI: 10.3969/j.issn.1000-2006.2014.01.008

Effect of different land uses on soil nitrogen mineralization in a coastal area of northern Jiangsu province, China, in winter

CHEN Shuxin¹,WANG Guobing¹,RUAN Honghua^1*,YUE Zhen¹,XU Changbai²,XU Yaming²

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Abstract

In order to study the effect of different land use patterns on soil N mineralization, transportation, absorption and utilization of plant, and which lead to difference of soil nitrogen cycle, we selected four different land use patterns(i.e. poplar plantation, crop-poplar integrated system, meadow and cropland)in a coastal area of northern Jiangsu as the experimental sites. The variations of soil mineral N were determined by close-top incubation method. The soil net N mineralization rate, soil microbial biomass nitrogen(SMBN), water-soluble organic nitrogen(WSON)and soil physical and chemical properties were analyzed. The results showed that the net N mineralization rate decreased in order of poplar plantation, crop-poplar integrated system, cropland and meadow. Ammonium N was significantly positive correlated with microbial biomass nitrogen and total nitrogen, the nitrate N was significantly positive correlated with microbial biomass nitrogen, WSON and organic carbon, but the soil C/N was significantly negative correlated with ammonium N and total mineral nitrogen. The soil mineral nitrogen decreased with soil depth increasing. In 25-40 cm soil layers, the soil mineral nitrogen had significant difference with poplar plantation and crop-poplar integrated system. The results indicated that different land use patterns would affect soil net N mineralization rate, and the conversion of forest into cropland or crop-forest system could also alter the cycle rate of nitrogen significantly.

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CHEN Shuxin,WANG Guobing,RUAN Honghua,YUE Zhen,XU Changbai,XU Yaming. Effect of different land uses on soil nitrogen mineralization in a coastal area of northern Jiangsu province, China, in winter[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2014, 38(01): 41-46 https://doi.org/10.3969/j.issn.1000-2006.2014.01.008

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