南京林业大学学报（自然科学版）2017，Vol.41Issue(5)：13-17,5.DOI:10.3969/j.issn.1000-2006.201612014
喀斯特原生乔木林和次生林土壤氮矿化特征
Characteristics of soil nitrogen mineralization in a Karst primary forest and a secondary forest
摘要
Abstract
[Objective]This study explored the characteristics of nitrogen ( N ) mineralization and nitrogen supply capacity in a Karst primary forest and a secondary forest.[Method]A Karst primary forest and a secondary forest were chosen as study sites. Temporal variations in soil N mineralization and nitrification were determined in situ by continuous incubation by using the resin?core method.[Result]①With an increase in incubation time, the content of soil inorganic N in both the primary forest and the secondary forest showed pronounced variation. The NH+4?N contents firstly increased, then decreased and finally increased, while NO-3?N contents generally increased. The NH+4?N was the main form of inor?ganic N, and accounted for 8457%-9431% of the soil inorganic nitrogen. ② The mineralization rate had a 'V' shape, and its ranges in primary forest and secondary forest were -043-097 mg/( kg·d) and -091-143 mg/( kg· d), respectively. Nitrification rates tended to increase, and were 021-049 mg/(kg·d), 003-031 mg/(kg·d), respectively. ③The inorganic N content and rates of net nitrogen mineralization, nitrification, and ammonification in the primary forest were higher than those in the secondary forest. ④The annual net amount of N mineralization was 17082 kg/( hm2·a) in the Karst primary forest, 248 times that in the secondary forest. Nitrified N in the primary forest and the secondary forest were 95% and 100%, respectively, of mineralized N.[Conclusion]The soil in the Karst forest had a relatively high capacity for supplying N, and soil nitrification played a dominant role in the process of soil N mineraliza?tion, indicating that the available N was volatile or easy to leach.关键词
喀斯特森林/群落类型/树脂芯法/土壤氮矿化Key words
Karst forest/community type/resin⁃core technique/soil nitrogen mineralization分类
农业科技引用本文复制引用
赵文君,崔迎春,吴鹏,刘延惠,丁访军,侯贻菊,舒德远..喀斯特原生乔木林和次生林土壤氮矿化特征[J].南京林业大学学报（自然科学版）,2017,41(5):13-17,5.基金项目
贵州省林业厅青年人才基金项目(黔林科合J字[2014]09号,黔林科合J字[2015]14号) （黔林科合J字[2014]09号,黔林科合J字[2015]14号）
贵州省重大基础研究项目(黔科合JZ字[2014]200212) （黔科合JZ字[2014]200212）
贵州森林生态效益监测与评价科技创新人才团队项目(黔科合人才团队[2014]4004号) （黔科合人才团队[2014]4004号）
贵州省林业科学研究院院士工作站项目(黔科合院士站[2014]4006) （黔科合院士站[2014]4006）
