南京林业大学学报（自然科学版）2013，Vol.37Issue(4)：45-50,6.
间伐对长江滩地杨树人工林土壤有效氮素的影响
Effects of thinning treatments on soil available nitrogen of the poplar plantations in flooding land of Yangtze River
摘要
Abstract
In order to improve the quality of the poplar plantations,the 6-year-old poplar plantations located in the Nanjing beach of Yangtze River were chosen to study thinning effects.Five thinning treatments (contrast,30％ intensity of the lower thinning,40％ intensity of the lower thinning,50％ intensity of the lower thinning and 50％ intensity of the mechanical thinning) were designed in this experiment.The effects of soil available nitrogen supply,including inorganic nitrogen,DON (soil dissolved organic nitrogen) and SMBN (soil microbial biomass nitrogen) under different thinning treatments were investigated.The results showed that:(1) Soil available nitrogen was significantly affected by thinning treatments and the contents of available nitrogen,DON and SMBN were the highest in the treatments of 50％ thinning intensities.(2) The contents of inorganic nitrogen,DON and SMBN showed a seasonal dynamic,and the highest contents of soil available nitrogen were in August.(3) The surface gathering of the available nitrogen was found for all the treatments,and the content at the soil depth of 0-5 cm was significantly higher than that of other two soil depths.(4) The correlation analysis showed a poor correlation among the contents of different types of soil available nitrogen within the experimental period.However,a significant and positive correlation between SMBN and DON as well as soil nitrate nitrogen was found during August.Results from the present study would provide a theoretical basis for the cultivating poplar large-diameter timber.关键词
杨树人工林/间伐强度/土壤无机氮/水溶性有机氮/微生物量氮/长江滩地Key words
poplar plantation/ thinning intensity/ inorganic nitrogen/ DON / SMBN / flood land of Yangtze River分类
农业科技引用本文复制引用
囤兴建,曲宏辉,田野,方升佐,徐锡增..间伐对长江滩地杨树人工林土壤有效氮素的影响[J].南京林业大学学报（自然科学版）,2013,37(4):45-50,6.基金项目
国家重点基础研究发展计划(2012CB416904) （2012CB416904）
江苏省普通高校研究生科研创新基金(CXZZ11_0535) （CXZZ11_0535）
