期刊
GLOBAL BIOGEOCHEMICAL CYCLES
卷 29, 期 10, 页码 1754-1762出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GB005144
关键词
-
资金
- Belgian Technical Cooperation
- Swedish strategic research area Biodiversity and Ecosystem services in a Changing Climate, BECC
- European Commission (International Outgoing Fellowships for career development (IOF) - Marie Curie Actions) [PIOF-GA-2011-301443]
- Fund for Scientific Research - Flanders (FWO)
Many pristine humid tropical forests show simultaneously high nitrogen (N) richness and sustained loss of bioavailable N forms. To better understand this apparent upregulation of the N cycle in tropical forests, process-based understanding of soil N transformations, in geographically diverse locations, remains paramount. Field-based evidence is limited and entirely lacking for humid tropical forests on the African continent. This study aimed at filling both knowledge gaps by monitoring N losses and by conducting an in situ N-15 labeling experiment in the Nyungwe tropical montane forest in Rwanda. Here we show that this tropical forest shows high nitrate (NO3-) leaching losses, confirming findings from other parts of the world. Gross N transformation rates point to an open soil N cycle with mineralized N nitrified rather than retained via immobilization; gross immobilization of NH4+ and NO3- combined accounted for 37% of gross mineralization, and plant N uptake is dominated by ammonium (NH4+). This study provided new process understanding of soil N cycling in humid tropical forests and added geographically independent evidence that humid tropical forests are characterized by soil N dynamics and N inputs sustaining bioavailable N loss.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据