External nitrogen input and soil inorganic nitrogen pool in different stands of poplar plantations

doi:10.3969/j.issn.1000-2006.2015.04.012

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2015, Vol. 39 ›› Issue (04): 69-74.doi: 10.3969/j.issn.1000-2006.2015.04.012

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External nitrogen input and soil inorganic nitrogen pool in different stands of poplar plantations

YAN Yafei^1,2,3, TIAN Ye^1,2, FANG Shengzuo^1,2*,SONG Hao^1,2, DUN Xingjian^1,2,4

1.Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China;
2.College of Forestry, Nanjing Forestry University, Nanjing 210037, China;
3. Forestry College, Henan University of Science and Technology, Luoyang 471003, China;
4. Shandong Acdemy of Forestry, Jinan 250014, China

Online:2015-07-31 Published:2015-07-31

Abstract

Abstract: The seasonal soil nitrogen input was monitored using ion-exchange resin method, and the soil inorganic N pool(0-20 cm)was also determined in poplar plantations with different planting spacing in Chenwei Forestry Farm, Sihong County, Jiangsu Province. The results showed that the external inorganic nitrogen input had a seasonal pattern and the input of nitrate was the highest from August to October 2012 and the input of ammonium was the highest from February to April 2013. The gross input of inorganic nitrogen from May to October under high density stand was higher than those under low density stand. Inorganic nitrogen concentration and total inorganic nitrogen had a seasonal pattern. The concentration of NO^-₃-N was higher in growing season than other periods and the concentration of NH⁺₄-N was higher in November. However, total inorganic nitrogen concentration of different stand structures had the minimum in February 2013. The total inorganic nitrogen was lower in low density stand than high density stand, which could be displayed obviously in August.

CLC Number:

S727.1

YAN Yafei, TIAN Ye, FANG Shengzuo,SONG Hao, DUN Xingjian^1,2,4. External nitrogen input and soil inorganic nitrogen pool in different stands of poplar plantations[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2015, 39(04): 69-74.

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External nitrogen input and soil inorganic nitrogen pool in different stands of poplar plantations

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