北京林业大学学报2016，Vol.38Issue(4)：21-28,8.DOI:10.13332/j.1000-1522.20150464
氮沉降和干旱对阔叶红松林凋落物分解的影响
Effects of nitrogen deposition and drought on litter decomposition in a temperate forest
摘要
Abstract
To study the responses of nitrogen ( N ) deposition and drought on litter decomposition, we conducted an in situ experiment in a broadleaf﹣Korean pine mixed forest in Changbai Mountains by using litterbag technique. Four treatments were installed, i. e. , null level of N ( CK) , N addition ( N, 50 kg N/( ha·a ) ) , precipitation reduction ( RP, - 30%) and precipitation reduction combined with N addition ( RP+N) . The results showed that it would take 6. 025 to 15. 167 years to decompose 95% of mass of litter used. Among the tree species, Tilia amurensis ( TA) had the highest decomposition rate, followed by Quercus mongolica ( MQ) , and Pinus koraiensis ( PK) showed the lowest decomposition rate. After 92 d and 154 d, although the litter decomposition rate with N addition was higher than those with CK, no significant difference was found; whereas the decomposition rate of litter in RP and RP +N treatments was significantly lower than that of CK (P<0. 05). But after 365 d and 457 d, the differences between RP, RP+N and CK were also significant. Compared with CK, N and drought treatments had a 42. 64% -51. 01% decrease of litter C/N ratio. As a whole, N deposition had no significant effects on litter decomposition and C and N concentration, but RP and RP +N significantly inhibited the litter decomposition, and C and N release.关键词
氮沉降/降水减少/凋落物分解/碳氮释放/C/N/阔叶红松林/长白山Key words
nitrogen deposition/reduce precipitation/litter decomposition/C and N/C/N ratio/broadleaf﹣Korean pine mixed forest/Changbai Mountains分类
农业科技引用本文复制引用
郑俊强,郭瑞红,李东升,李东,李金功,朱保坤,韩士杰..氮沉降和干旱对阔叶红松林凋落物分解的影响[J].北京林业大学学报,2016,38(4):21-28,8.基金项目
“973”国家重点基础研究发展计划项目(2011CB403202、2014CB954400)、国家自然科学基金项目(41173087、41330530)。 （2011CB403202、2014CB954400）
