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首页> 外文期刊>Plant and Soil >Effects of irrigation on litterfall, fine root biomass and production in a semideciduous lowland forest in Panama
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Effects of irrigation on litterfall, fine root biomass and production in a semideciduous lowland forest in Panama

机译：灌溉对巴拿马半落叶低地森林凋落物，细根生物量和产量的影响

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摘要

The effects of irrigation on fine root biomass, root production and litterfall were measured at the community level, in a semideciduous lowland forest composed of a mixture of evergreen and deciduous species at an altitude of 60 m on Barro ColoradoIsland, Panama. Biomass of roots <2 mm in diameter, in the first 10 cm of the soil (measured with soil cores), was higher in irrigated (1.80 Mg/ha) than in non-irrigated plots (1.24 Mg/ha). During the dry season, productivity of roots (measured with ingrowth cylinders filled with root-free soil), was higher in irrigated (1.6 g/m2 per day) than in control plots (0.3 g/m2 per day). In control plots, root productivity was highly seasonal. Maximum root growth into the root-free soil, occurred during the transitions from dry to wet, and from wet to dry season, possibly as a response to water and/or nutrient pulses. Litterfall was not significantly different between irrigated (3.8 g/m2 per day) and control plots (3.7 g/m2 per day). The results of this studyshow that root-productivity is limited by the water supply during the dry season, and that water by itself, is not a limiting factor for community-level litter production.
机译：在巴拿马Barro Colorado Island海拔60 m的半落叶低地森林中，灌溉对细根生物量，根系产量和凋落物的影响在群落水平上进行了测定，该森林由常绿和落叶物种的混合物组成。在土壤的前10厘米（以土壤核心测量）中，直径小于2毫米的根的生物量在灌溉（1.80 Mg / ha）下高于非灌溉地（1.24 Mg / ha）。在干旱季节，灌溉条件下（每天1.6 g / m2）的根系生产力（用无根土壤填充的向内生长圆筒测量）高于对照样地（每天0.3 g / m2）。在控制区，根系生产力是高度季节性的。在从干湿过渡到从干湿过渡到干季的过程中，最大的根生长进入无根土壤，这可能是对水和/或养分脉冲的响应。灌溉水（每天3.8 g / m2）和对照地（每天3.7 g / m2）之间的凋落物没有显着差异。这项研究的结果表明，在干旱季节，根系生产力受到供水的限制，而水本身并不是社区级别垫料生产的限制因素。

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