Nutrient-cycling mechanisms other than the direct absorption from soil may control forest structure and dynamics in poor Amazonian soils.
Nutrient-cycling mechanisms other than the direct absorption from soil may control forest structure and dynamics in poor Amazonian soils.
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DOI：
10.1038/srep45017
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发表时间：
2017-03-23
影响因子：
4.6
通讯作者：
Hérault B
中科院分区：
文献类型：
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作者：
Grau O;Peñuelas J;Ferry B;Freycon V;Blanc L;Desprez M;Baraloto C;Chave J;Descroix L;Dourdain A;Guitet S;Janssens IA;Sardans J;Hérault B
热带森林储存大量的生物量，尽管它们通常生长在营养贫乏的土壤中，这表明土壤特性在热带森林的结构和动态中的作用是复杂的。我们使用来自法属圭亚那几个永久性地块的> 34000棵树木的数据，研究土壤特性是否可以预测营养贫乏的热带森林的结构（树木直径，密度和地上生物量）和动态（生长，死亡率，地上木材生产力）。大多数变量没有协变与站点水平的变化，土壤养分含量，表明养分循环机制以外的直接吸收从土壤（如养分吸收凋落物，再吸收，或存储在生物量中的养分），可能强烈地控制森林结构和动态。生态系统一级对低土壤养分供应和长期低水平干扰的适应可能有助于解释与养分丰富的森林相比，养分贫乏的森林生产力较低，生物量积累较高的原因。
Tropical forests store large amounts of biomass despite they generally grow in nutrient-poor soils, suggesting that the role of soil characteristics in the structure and dynamics of tropical forests is complex. We used data for >34 000 trees from several permanent plots in French Guiana to investigate if soil characteristics could predict the structure (tree diameter, density and aboveground biomass), and dynamics (growth, mortality, aboveground wood productivity) of nutrient-poor tropical forests. Most variables did not covary with site-level changes in soil nutrient content, indicating that nutrient-cycling mechanisms other than the direct absorption from soil (e.g. the nutrient uptake from litter, the resorption, or the storage of nutrients in the biomass), may strongly control forest structure and dynamics. Ecosystem-level adaptations to low soil nutrient availability and long-term low levels of disturbance may help to account for the lower productivity and higher accumulation of biomass in nutrient-poor forests compared to nutrient-richer forests.