Nitrogen stable isotopic composition of leaves and soil: Tropical versus temperate forests

被引:341
作者
Martinelli, LA
Piccolo, MC
Townsend, AR
Vitousek, PM
Cuevas, E
McDowell, W
Robertson, GP
Santos, OC
Treseder, K
机构
[1] Cena, BR-13416000 Piracicaba, SP, Brazil
[2] Univ Colorado, INSTAAR, Boulder, CO 80309 USA
[3] Univ Colorado, Dept EPO Biol, Boulder, CO 80309 USA
[4] Stanford Univ, Dept Biol Sci, Stanford, CA 94305 USA
[5] IVIC, Miami, FL 33102 USA
[6] Univ New Hampshire, Dept Nat Resources, Durham, NH 03824 USA
[7] Michigan State Univ, Wk Kellogg Biol Stn, Hickory Corners, MI 49060 USA
[8] Minist Sci Technol & Environm, Inst Meteorol, Havana, Cuba
关键词
N15; nitrogen; nutrient cycling; plants; stable isotopes; soil; temperate forest; tropical forest;
D O I
10.1007/BF01007573
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Several lines of evidence suggest that nitrogen in most tropical forests is relatively more available than N in most temperate forests, and even that it may function as an excess nutrient in many tropical forests. If this is correct, tropical forests should have more open N cycles than temperate forests, with both inputs and outputs of N large relative to N cycling within systems. Consequent differences in both the magnitude and the pathways of N loss imply that tropical forests should in general be more N-15 enriched than are most temperate forests. In order to test this hypothesis, we compared the nitrogen stable isotopic composition of tree leaves and soils from a variety of tropical and temperate forests. Foliar delta(15)N values from tropical forests averaged 6.5 parts per thousand higher than from temperate forests. Within the tropics, ecosystems with relatively low N availability (montane forests, forests on sandy soils) were significantly more depleted in N-15 than other tropical forests. The average delta(15)N values for tropical forest soils, either for surface or for depth samples, were almost 8 parts per thousand higher than temperate forest soils. These results provide another line of evidence that N is relatively abundant in many tropical forest ecosystems.
引用
收藏
页码:45 / 65
页数:21
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