Green J J, Newbery D M
Present address: Land Management Department, Scottish Agricultural College, Craibstone Estate, Aberdeen AB21 9TQ, Scotland, UK.
Institute of Plant Sciences, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland.
New Phytol. 2001 Jul;151(1):291-309. doi: 10.1046/j.1469-8137.2001.00157.x.
• The poor regeneration of Microberlinia bisulcata in groves in Korup, Central Africa was investigated in the forest to highlight factors that interact with light. • Survival and growth of nursery-grown seedlings of M. bisulcata with four other species in each of two 1-yr trials were recorded after transplantation into quadrats differing in PAR. Total mass was predicted for PAR treatments in nursery trials reported separately. • Plant mass was strongly dependent on PAR for all species. At low PAR, across species, plant mass was positively related to seed mass. Forest : nursery mass ratios decreased with increasing PAR; M. bisulcata had the lowest ratios of all species at high PAR. Leaf weight ratio declined more steeply with increasing PAR in the forest than in the nursery and this was particularly marked for M. bisulcata. • Herbivory was the most probable cause of leaf loss. Forest : nursery ratios were negatively correlated with species' abundances in the forest. Besides its small seed size and shade intolerance, M. bisulcata is highly susceptible to leaf loss when illuminated. Opportunities for seedling release are thus very low.
• 对中非科鲁普地区树林中双沟微柏林（Microberlinia bisulcata）再生不良的情况进行了森林调查，以突出与光照相互作用的因素。
• 在两次为期1年的试验中，将双沟微柏林的苗圃培育幼苗与其他四个物种分别移植到不同光合有效辐射（PAR）的样方中，记录其存活和生长情况。单独报告的苗圃试验中预测了PAR处理下的总质量。
• 所有物种的植物质量都强烈依赖于PAR。在低PAR条件下，跨物种来看，植物质量与种子质量呈正相关。森林与苗圃的质量比随着PAR的增加而降低；在高PAR条件下，双沟微柏林在所有物种中的质量比最低。森林中叶片重量比随PAR增加的下降幅度比苗圃中更大，双沟微柏林尤为明显。
• 食草作用最有可能是叶片损失的原因。森林与苗圃的比例与该物种在森林中的丰度呈负相关。除了种子小和不耐荫外，双沟微柏林在光照时极易叶片损失。因此，幼苗释放的机会非常低。
