Early effect of elevated nitrogen input on above-ground net primary production of a lower montane rain forest, Panama

被引:38
作者
Adamek, Markus [1 ]
Corre, Marife D. [1 ]
Hoelscher, Dirk [2 ]
机构
[1] Univ Gottingen, Busgen Inst, D-37077 Gottingen, Germany
[2] Univ Gottingen, Burckhardt Inst, D-37077 Gottingen, Germany
关键词
Eschweilera panamensis; litterfall; Oreomunnea mexicana; nitrogen fertilization; nitrogen limitation; stem diameter growth; Vochysia guatemalensis; woody biomass production; WET TROPICAL MOUNTAINS; FINE-LITTER PRODUCTION; LEAF LIFE-SPAN; TREE GROWTH; NUTRIENT LIMITATION; PHOSPHORUS FERTILIZATION; MINERAL-NUTRITION; CLOUD FOREST; SOIL; PLANT;
D O I
10.1017/S0266467409990253
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
To evaluate N limitation on above-ground net primary production in a tropical lower montane rain forest, an N fertilization experiment was conducted for 2 y. The study site is located at 1200-1300 m asl in the Fortuna forest reserve in western Panama and has a mature, mixed-species stand growing on an Andisol soil. Control and N-fertilized (1.25 kg urea-N ha(-1) y(-1)) treatments were represented by four replicate plots (each 40 x 40 in, separated by at least 40 in). Stem diameter growth was analysed by diameter at breast height classes and also for the three most abundant species. The three species did not respond to N addition. The response of stem growth and above-ground woody biomass production to N fertilization varied among dbh classes. Stem growth of trees of 10-30 cm dbh increased only in the first: year of N addition while trees of 30-50 cm dbh responded in the second year of N addition, which may be due to differences in light conditions between years. Trees > 50 cm dbh did not respond during 2 years of N addition. As a result, the overall stem growth and above-ground woody biomass production were not affected by N fertilization. Annual total fine litterfall increased in the first year of N fertilization, while annual leaf litterfall increased in both years of N addition. Above-ground net primary production, of which total tine litterfall constituted 68%, also increased only in the first year of N addition. The magnitude and timing of response of stem diameter growth and litterfall suggest that these aspects of above-ground productivity are not uniformly limited by N availability.
引用
收藏
页码:637 / 647
页数:11
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