TROPICAL FOREST LITTER DECOMPOSITION UNDER SEASONAL DROUGHT - NUTRIENT RELEASE, FUNGI AND BACTERIA
TROPICAL FOREST LITTER DECOMPOSITION UNDER SEASONAL DROUGHT - NUTRIENT RELEASE, FUNGI AND BACTERIA
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DOI：
10.2307/3545629
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发表时间：
1994-06-01
期刊：
影响因子：
3.4
通讯作者：
WRIGHT, SJ
中科院分区：
文献类型：
--
作者：
CORNEJO, FH;VARELA, A;WRIGHT, SJ
灌溉是用来研究的后果，季节性干旱的养分释放和细菌和真菌数量在旱季凋落物分解的热带森林巴罗科罗拉多岛，巴拿马。凋落物袋包含一个单一物种的叶子被放置在同种树下的旱季在1987年12月开始，并收集在一个月的时间间隔，直到1988年5月的雨季开始。连续稀释被用来量化密度的真菌和bacteries.Nutrition浓度的柠檬凋落物部分显示快速下降，在第一个月的曝光（K，P），其次是生物积累（N）或没有显着的变化在接下来的四个月（P，K，Mg和大多数Ca）。灌溉抑制钾浓度和提高N和Mg浓度可能作为一个后果的浸出和生物积累，分别。灌溉还压低了真菌密度在社区一级，并为三个8个物种，分别进行了分析。其余三种真菌的密度变化显着凋落物基质物种。一个月的曝光后，通过灌溉提高了细菌密度，但在五个月后，这可能反映了凋落物基质质量降低而被压抑。
Irrigation was used to study the consequences of seasonal drought for nutrient release and bacterial and fungal numbers during dry season litter decomposition in tropical forest on Barro Colorado Island, Panama. Litter bags containing a single species of leaves were placed beneath conspecific trees at the onset of the dry season in December 1987 and collected at one-month intervals until the onset of the wet season in May 1988. Serial dilutions were used to quantify densities of fungi and bacteria.Nutrient concentrations in recalcitrant litter fractions showed rapid declines in the first month of exposure (K, P) followed by bioaccumulation (N) or no significant changes over the next four months (P, K, Mg and most Ca). Irrigation depressed K concentrations and enhanced N and Mg concentrations possibly as a consequence of leaching and bioaccumulation, respectively.Irrigation also depressed fungal densities at the community level and for three of eight species that were analysed separately. Densities of three of the remaining species of fungi varied significantly among litter substrate species. Bacterial densities were enhanced by irrigation after one month of exposure but were depressed after five months which may reflect reduced litter substrate quality.