Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s00442-013-2848-8 |
Overlap in nitrogen sources and redistribution of nitrogen between trees and grasses in a semi-arid savanna | |
Priyadarshini, K. V. R.1; Prins, Herbert H. T.1; de Bie, Steven1; Heitkonig, Ignas M. A.1; Woodborne, Stephan2; Gort, Gerrit3; Kirkman, Kevin4; Fry, Brian5; de Kroon, Hans6 | |
通讯作者 | Priyadarshini, K. V. R. |
来源期刊 | OECOLOGIA |
ISSN | 0029-8549 |
EISSN | 1432-1939 |
出版年 | 2014 |
卷号 | 174期号:4页码:1107-1116 |
英文摘要 | A key question in savanna ecology is how trees and grasses coexist under N limitation. We used N stable isotopes and N content to study N source partitioning across seasons from trees and associated grasses in a semi-arid savanna. We also used N-15 tracer additions to investigate possible redistribution of N by trees to grasses. Foliar stable N isotope ratio (delta N-15) values were consistent with trees and grasses using mycorrhiza-supplied N in all seasons except in the wet season when they switched to microbially fixed N. The dependence of trees and grasses on mineralized soil N seemed highly unlikely based on seasonal variation in mineralization rates in the Kruger Park region. Remarkably, foliar delta N-15 values were similar for all three tree species differing in the potential for N fixation through nodulation. The tracer experiment showed that N was redistributed by trees to understory grasses in all seasons. Our results suggest that the redistribution of N from trees to grasses and uptake of N was independent of water redistribution. Although there is overlap of N sources between trees and grasses, dependence on biological sources of N coupled with redistribution of subsoil N by trees may contribute to the coexistence of trees and grasses in semi-arid savannas. |
英文关键词 | Tree-grass interactions Nitrogen source Nitrogen-15 stable isotope Nitrogen-15 labelling Andover Game Reserve Nitrogen redistribution |
类型 | Article |
语种 | 英语 |
国家 | Netherlands ; South Africa ; Australia |
收录类别 | SCI-E |
WOS记录号 | WOS:000333171400004 |
WOS关键词 | N-15 NATURAL-ABUNDANCE ; AFRICAN SAVANNA ; ROOT ACTIVITY ; PATTERNS ; WATER ; AVAILABILITY ; VEGETATION ; PHYSIOLOGY ; ISOTOPES ; DEPTH |
WOS类目 | Ecology |
WOS研究方向 | Environmental Sciences & Ecology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/184023 |
作者单位 | 1.Wageningen Univ, Resource Ecol Grp, NL-6700 AP Wageningen, Netherlands; 2.WITS, iThemba Labs, ZA-2050 Johannesburg, South Africa; 3.Wageningen Univ, NL-6700 AP Wageningen, Netherlands; 4.Univ KwaZulu Natal, ZA-3209 Pietermaritzburg, South Africa; 5.Griffith Univ, Australian Rivers Inst, Brisbane, Qld 4111, Australia; 6.Radboud Univ Nijmegen, Inst Water & Wetland Res, Dept Expt Plant Ecol, NL-6525 ED Nijmegen, Netherlands |
推荐引用方式 GB/T 7714 | Priyadarshini, K. V. R.,Prins, Herbert H. T.,de Bie, Steven,et al. Overlap in nitrogen sources and redistribution of nitrogen between trees and grasses in a semi-arid savanna[J],2014,174(4):1107-1116. |
APA | Priyadarshini, K. V. R..,Prins, Herbert H. T..,de Bie, Steven.,Heitkonig, Ignas M. A..,Woodborne, Stephan.,...&de Kroon, Hans.(2014).Overlap in nitrogen sources and redistribution of nitrogen between trees and grasses in a semi-arid savanna.OECOLOGIA,174(4),1107-1116. |
MLA | Priyadarshini, K. V. R.,et al."Overlap in nitrogen sources and redistribution of nitrogen between trees and grasses in a semi-arid savanna".OECOLOGIA 174.4(2014):1107-1116. |
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