摘要
1998年7月,用埋袋法对西双版纳热带季节雨林、崖豆藤(Mellettialeptobotrya)次生林、季节雨林内林窗和轮歇地土壤的氮矿化和硝化作用进行了研究。研究结果表明季节雨林和崖豆藤次生林的格局基本相同,氮净矿化速率分别为6.55mgN·kg-1·30d-1和6.37mgN·kg-1·30d-1,硝化速率分别为16.28mgN·kg-1·30d-1和16.38mgN·kg-1·30d-1。而林窗下和轮歇地土壤的氮净矿化速率和硝化速率均为负值,氮净矿化速率分别为-7.85mgN·ks-1·30d-1和-10.69mgN·kg-1·30d-1,硝化速率分别为-2.78N·kg-1·30d-1和-3.69mgN·kg-1·30d-1。从实验结果看,在30d的培养过程中,NH4-N消耗较多,导致硝化速率大于氮净矿化速率。
Using the buried-bag method we measured nitrification and net N mineralization rates for soils (0~ 10cm) under a variety of forest types in Xishuangbanna, Southwest China in July of 1998. The forest types studied were: tropical seasonal rainforest, Melettia leptobotrya secondary forest, forest gap, and slash-and-burn agricultural land.Net N mineralization rates were 6. 55 mg N·kg-1. 30d-1 in seasonal rainforest and 6. 37 mg N· kg-1. 30d-1 in secondary forest. Nitrification rates were 16. 28 mg N· kg-1. 30d-1 in seasonal ralnforest, 16. 38 mg N· kg-1· 30d-1 in secondary forest. Nitrification and net N mineralization rates were -2. 78 mg N·kg-1. 30d-1 and - 7. 85 mg N· kg-1· 30d-1 in forest gap, -3. 69 mg N· kg-1· 30d-1 and - 10. 69 mg N· kg-1· 30d-1 in agricultural land, respectively. Ammonification rates were negative in all the studled sites, with the result that net N mineraliza tion rates were lower than nitrification rates.
出处
《植物生态学报》
CAS
CSCD
北大核心
2000年第2期152-156,共5页
Chinese Journal of Plant Ecology
基金
中国科学院"九.五"重大项目!KZ95T-04-02-07
云南省自然科学基金!97C017R
中国科学院重点支持项目!KZ952-S1-101
中国科学院生
关键词
热带雨林
次生林
林窗
氮矿化
硝化
森林土壤
Tropical rainforest, Secondary forest, Forest gap, N mineralization, Nitrification, Ammonification