Below-ground secondary succession in tropical forests of Borneo
Below-ground secondary succession in tropical forests of Borneo
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DOI：
10.1017/s0266467411000149
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发表时间：
2011-05
影响因子：
1.4
通讯作者：
F. Brearley
中科院分区：
文献类型：
--
作者：
F. Brearley
摘要：随着热带原始森林的破坏和严重干扰的持续，了解这些森林如何从干扰中恢复是很重要的。在地上开采方面已经做了大量的工作，但对地下开采过程了解较少。为了确定婆罗洲中部低地森林热带次生演替过程中根系质量的变化，从放弃农业（1年、3年、14年和31年）以来年龄不断增加的林分中采集样本，并进行原生林控制（6个样地来自1年林分，3个样地来自其他林分）。测定了根质量和元素浓度，并对土壤进行了化学分析。细根（< 2mm直径）和小根（< 5mm直径）的根质量不随林龄增加，粗根（5 ~ 10mm直径）的根质量有随林龄增加的趋势。根系质量与土壤养分状况呈负相关。细根碳浓度随林龄增加而增加，但林龄对细根氮和磷的影响不明显，细根质量随林龄增加不显著，表明恢复迅速；相反，土壤养分状况似乎是控制根质量的最重要因素。在本研究测量的土壤养分中，氮对根质量的控制强于磷，这表明该元素可能在婆罗洲热带低地森林的次生演替中起限制作用。
Abstract: As the destruction and severe disturbance of primary tropical forest continues, it is important to understand how these forests may recover from perturbations. Considerable work has been done on above-ground recovery but below-ground processes are less well understood. To determine changes in root mass during tropical secondary succession in lowland forests of Central Borneo, samples were taken from stands of increasing ages since abandonment of agriculture (1, 3, 14 and 31 y) with a primary forest control (six plots from 1-y-old stands and three from all other ages). Root mass and elemental concentrations were determined and soils were chemically analysed. There was no increase in root mass with stand age for fine-root (< 2 mm diameter) or small-root (< 5 mm diameter) mass but there was a trend for coarse-root mass (5–10 mm diameter) to increase with stand age. Negative correlations were shown between root mass and soil nutrient status. Fine-root C concentrations increased with stand age but there was no clear effect of stand age on fine-root N or P. Fine-root mass did not increase significantly with stand age suggesting a rapid recovery; instead, soil nutrient status appeared to be the most important factor controlling root mass. Of the soil nutrients measured in this study, N had a stronger control over root mass than P suggesting that this element may be limiting during secondary succession in tropical lowland forests of Borneo.