Organic and inorganic nitrogen uptake by 21 dominant tree species in temperate and tropical forests
文献类型：期刊论文
| 作者 | Liu, M; Li, CC; Xu, XL; Wanek, W; Jiang, N; Wang, HM; Yang, XD |
| 刊名 | TREE PHYSIOLOGY
 |
| 出版日期 | 2017 |
| 卷号 | 37期号:11页码:1515-1526 |
| ISSN号 | 0829-318X |
| 关键词 | AM fungi ECM fungi inorganic N organic N root nitrogen uptake temperate forest tropical forest |
| 英文摘要 | Evidence shows that many tree species can take up organic nitrogen (N) in the form of free amino acids from soils, but few studies have been conducted to compare organic and inorganic N uptake patterns in temperate and tropical tree species in relation to mycorrhizal status and successional state. We labeled intact tree roots by brief N-15 exposures using field hydroponic experiments in a temperate forest and a tropical forest in China. A total of 21 dominant tree species were investigated, 8 in the temperate forest and 13 in the tropical forest. All investigated tree species showed highest uptake rates for NH4+ (ammonium), followed by glycine and NO3- (nitrate). Uptake of NH4+ by temperate trees averaged 12.8 mu g N g(-1) dry weight (d.w.) root h(-1), while those by tropical trees averaged 6.8 mu g N g(-1) d.w. root h(-1). Glycine uptake rates averaged 3.1 mu g N g(-1) d. w. root h(-1) for temperate trees and 2.4 mu g N g(-1) d.w. root h(-1) for tropical trees. NO3- uptake was the lowest (averaging 0.8 mu g N g(-1) d. w. root h(-1) for temperate trees and 1.2 mu g N g(-1) d.w. root h(-1) for tropical trees). Uptake of NH4+ accounted for 76% of the total uptake of all three N forms in the temperate forest and 64% in the tropical forest. Temperate tree species had similar glycine uptake rates as tropical trees, with the contribution being slightly lower (20% in the temperate forest and 23% in the tropical forest). All tree species investigated in the temperate forest were ectomycorrhizal and all species but one in the tropical forest were arbuscular mycorrhizal (AM). Ectomycorrhizal trees showed significantly higher NH4+ and lower NO3- uptake rates than AM trees. Mycorrhizal colonization rates significantly affected uptake rates and contributions of NO3- or NH4+, but depended on forest types. We conclude that tree species in both temperate and tropical forests preferred to take up NH4+, with organic N as the second most important N source. These findings suggest that temperate and tropical forests demonstrate similar N uptake patterns although they differ in physiology of trees and soil biogeochemical processes. |
| 学科主题 | Forestry |
| 语种 | 英语 |
| 出版者 | OXFORD UNIV PRESS |
| WOS记录号 | WOS:000416400500007 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/43985]  |
| 专题 | 生态系统网络观测与模拟院重点实验室_生态网络实验室 |
| 推荐引用方式 GB/T 7714 | Liu, M,Li, CC,Xu, XL,et al. Organic and inorganic nitrogen uptake by 21 dominant tree species in temperate and tropical forests[J]. TREE PHYSIOLOGY,2017,37(11):1515-1526. |
| APA | Liu, M.,Li, CC.,Xu, XL.,Wanek, W.,Jiang, N.,...&Yang, XD.(2017).Organic and inorganic nitrogen uptake by 21 dominant tree species in temperate and tropical forests.TREE PHYSIOLOGY,37(11),1515-1526. |
| MLA | Liu, M,et al."Organic and inorganic nitrogen uptake by 21 dominant tree species in temperate and tropical forests".TREE PHYSIOLOGY 37.11(2017):1515-1526. |
入库方式： OAI收割
来源：地理科学与资源研究所
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