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苏北沿海不同土地利用方式冬季土壤氮矿化速率比较(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2014年01期
Page:
41-46
Column:
研究论文
publishdate:
2014-02-16

Article Info:/Info

Title:
Effect of different land uses on soil nitrogen mineralization in a coastal area of northern Jiangsu province, China, in winter
Article ID:
1000-2006(2014)01-0041-06
Author(s):
CHEN Shuxin1WANG Guobing1RUAN Honghua1*YUE Zhen1XU Changbai2XU Yaming2
1.Jiangsu Key Laboratory of Forestry Ecological Engineering,Nanjing Forestry University,Nanjing 210037,China;
2.Dongtai City State Forest Farm of Jiangsu Province, Dongtai 224200,China
Keywords:
mineral nitrogen microbial biomass nitrogen(MBN) water-soluble organic nitrogen land use pattern coastal area of northern Jiangsu province
Classification number :
S718
DOI:
10.3969/j.issn.1000-2006.2014.01.008
Document Code:
A
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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Last Update: 2014-01-15