不同温湿度条件下杨树人工林土壤氮矿化特征研究  

Study on the Effects of Temperature and Moisture on Nitrogen Mineralization of Soil in Poplar Plantations

作　　者：葛晓敏[1] 王瑞华[1] 唐罗忠[1] 贾志远[1] 朱玲[1] 李勇[1] 

机构地区：[1]南京林业大学林学院,南京210037

出　　处：《中国农学通报》2015年第10期208-213,共6页Chinese Agricultural Science Bulletin

基　　金：国际科技合作项目"长江中下游地区林特植物资源高效培育及开发利用技术"(2011DFA30490);林业科技成果推广项目"南方地区高产;高效杨树人工林定向培育技术体系的推广与应用"[(2012)51号];江苏省普通高校研究生科研创新计划项目"杨树人工林可持续经营的养分机制"(CXZZ13_0550)

摘　　要：为了掌握不同温度和湿度条件下杨树人工林土壤的氮矿化过程,探明土壤在干旱条件下的氮矿化特征,采用室内培养法,将含水量分别为田间持水量的20%（重度干旱处理）、40%（轻度干旱处理）和70%（对照处理）的杨树人工林表层土壤（0-10 cm）,分别置于15、20、25、30℃恒温条件下进行了8周培养试验,研究不同温湿度条件下的土壤氮矿化特征。结果表明：（1）土壤净氮矿化量与温度呈极显著正相关关系（P〈0.01）;（2）在较低温度条件下（15、20℃）,不同湿度土壤净氮矿化量表现为轻度干旱〉重度干旱〉对照,而在较高温度条件下（25、30℃）,培养前期的氮矿化量变化规律与低温处理一致,但至培养后期,则表现为对照〉轻度干旱〉重度干旱;（3）各种处理土壤矿质氮主要以硝态氮为主;（4）土壤电导率与土壤硝态氮含量、净氮矿化量呈极显著正相关关系（P〈0.01）。研究表明适度干旱能够促进土壤氮的早期矿化,但适宜的湿度更有利于土壤氮的长期矿化。In order to understand the nitrogen mineralization characteristics of poplar plantation soil indifferent temperature and moisture conditions, especially under drought condition, the author used laboratoryincubation method, incubated poplar plantation topsoil from 0-10 cm layer of three soil moisture 20%（severedrought）, 40%（mild drought） and 70%（control） of field moisture capacity for 8 weeks at 15, 20, 25 and 30℃,respectively. The results showed that：（1） the net nitrogen mineralization accumulation of soil was positivelyrelated to temperature（P〈0.01）;（2） at 15 and 20℃, the net nitrogen mineralization accumulation of soil indifferent moisture showed the order of mild drought〉severe drought〉control treatment; at 25 and 30℃, thesequence was the same as that at 15 and 20℃ in early incubation, while the order was control〉mild drought〉severe drought in the subsequent incubation time;（3） the net nitrogen mineralization accumulation was mainlynitrate nitrogen in the soil;（4） soil electrical conductivity was significantly positively related to soil nitratenitrogen and net nitrogen mineralization accumulation（P〈0.01）. It was suggested that slight drought conditionwas conducive to soil nitrogen mineralization in the early incubation period, however, the appropriate moisture condition could promote soil nitrogen mineralization in the long-term incubation period.

关 键 词：土壤氮矿化 室内培养 温度 湿度 

分 类 号：S154.2[农业科学—土壤学]