南京林业大学学报（自然科学版）Issue(4)：69-74,6.DOI:10.3969/j.issn.1000-2006.2015.04.012
不同密度杨树人工林的外源无机氮输入及土壤无机氮库研究
External nitrogen input and soil inorganic nitrogen pool in different stands of poplar plantations
摘要
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 un⁃der low density stand. Inorganic nitrogen concentration and total inorganic nitrogen had a seasonal pattern. The concentra⁃tion 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.关键词
杨树人工林/林分密度/外源氮输入/土壤无机氮库Key words
poplar plantation/stand density/external nitrogen input/soil inorganic nitrogen pool分类
农业科技引用本文复制引用
燕亚飞,田野,方升佐,宋浩,囤兴建..不同密度杨树人工林的外源无机氮输入及土壤无机氮库研究[J].南京林业大学学报（自然科学版）,2015,(4):69-74,6.基金项目
国家重点基础研究发展计划（2012CB416900）；江苏高校优势学科建设工程资助项目 （）
