Potassium, phosphorus, or nitrogen limit root allocation, tree growth, or litter production in a lowland tropical forest.
Potassium, phosphorus, or nitrogen limit root allocation, tree growth, or litter production in a lowland tropical forest.
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DOI：
10.1890/10-1558.1
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发表时间：
2011-08
期刊：
影响因子：
4.8
通讯作者：
S. Wright;J. Yavitt;N. Wurzburger;Benjamin L Turner;E. Tanner;E. Sayer;L. Santiago;M. Kaspari;L. Hedin;K. Harms;Milton N. García;M. Corre
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文献类型：
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作者：
S. Wright;J. Yavitt;N. Wurzburger;Benjamin L Turner;E. Tanner;E. Sayer;L. Santiago;M. Kaspari;L. Hedin;K. Harms;Milton N. García;M. Corre
我们保持了一个因子的氮（N），磷（P），钾（K）添加实验11年在潮湿的低地森林生长在一个相对肥沃的土壤在巴拿马，以评估潜在的营养限制树的生长速度，细凋落物生产，细根生物量。我们使用32个40 x 40 m的地块将8个析因处理重复4次。此外，K与显着降低林分水平细根生物量，并在同伴的研究幼苗，减少分配到根和增加高度的增长率。K和N的添加与树苗和杆（1-10厘米的直径在胸高）的生长速度显着增加，并进一步轻微显着降低林分水平细根生物量。除了P与一个轻微的显着（P = 0.058）增加，在所有的凋落物组分是一致的细凋落物生产。我们的实验提供的证据表明，氮，磷，钾都限制森林植物生长在一个相对肥沃的土壤在低地热带地区，与最强有力的证据之间的幼苗，树苗和杆K的限制。
We maintained a factorial nitrogen (N), phosphorus (P), and potassium (K) addition experiment for 11 years in a humid lowland forest growing on a relatively fertile soil in Panama to evaluate potential nutrient limitation of tree growth rates, fine-litter production, and fine-root biomass. We replicated the eight factorial treatments four times using 32 plots of 40 x 40 m each. The addition of K was associated with significant decreases in stand-level fine-root biomass and, in a companion study of seedlings, decreases in allocation to roots and increases in height growth rates. The addition of K and N together was associated with significant increases in growth rates of saplings and poles (1-10 cm in diameter at breast height) and a further marginally significant decrease in stand-level fine-root biomass. The addition of P was associated with a marginally significant (P = 0.058) increase in fine-litter production that was consistent across all litter fractions. Our experiment provides evidence that N, P, and K all limit forest plants growing on a relatively fertile soil in the lowland tropics, with the strongest evidence for limitation by K among seedlings, saplings, and poles.