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首页> 外文期刊>African Journal of Biotechnology >Assessment of soil seed bank from six different vegetation types in Kakamega forest, Western Kenya
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Assessment of soil seed bank from six different vegetation types in Kakamega forest, Western Kenya

机译：肯尼亚西部卡卡梅加森林中六种不同植被类型的土壤种子库评估

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摘要

Kakamega forest, the only rainforest in Kenya, has faced extensive fragmentation and degradation over the last decades. Slow recovery of degraded areas is due to slow or no natural regeneration. An assessment was conducted to ascertain the contribution of soil seed bank in forest regeneration within six sites in Kakamega Forest. Sites investigated were the natural forest, plantation, shrubland, secondary grassland, natural glade, and burnt glade. Soil sampling was done from three stratified depths of 0 to 5, 5 to10 and 10 to 15 cm in each site. Soil seed bank was determined by seedling emergence technique and total seed counts. Laboratory experiments on seed viability were done in a germination chamber at 20°C. Soil seed banks in all the six vegetation types were mainly dominated by herbaceous species. There was a high seed density in the upper layers for all the sites except for natural forest and burnt glade. Seed viability tests revealed low seed viability for the seeds from all the sites. It was concluded that natural regeneration is slowed by low woody species which ranged from 5.7 for natural glade to 48.4% for natural forest soil seed bank, and a low seed viability that ranged between 1.3 for plantation to 33.8% for grassland. It is therefore important to consider other ways of forest restoration other than the soil seed bank.
机译：在过去的几十年中，卡卡梅加森林是肯尼亚唯一的雨林，已经面临着广泛的支离破碎和退化。退化地区恢复缓慢是由于自然再生缓慢或没有自然再生。进行了评估以确定土壤种子库对卡卡梅加森林（Kakamega Forest）中六个地点的森林更新的贡献。调查的地点是天然森林，人工林，灌木丛，次生草地，天然林间空地和烧过的林间空地。从每个位置的0至5、5至10和10至15厘米的三个分层深度进行土壤采样。土壤种子库通过出苗技术和种子总数来确定。在20℃的发芽室内进行种子活力的实验室实验。六种植被类型的土壤种子库均以草本种为主。除天然森林和林间空地以外，所有地方的上层种子密度都很高。种子活力测试显示，所有部位的种子活力都较低。结论是，低木本物种减慢了自然更新，木本物种的范围从天然林间空地的5.7到天然林地种子库的48.4％，以及较低的种子生存力，从人工林的1.3到草地的33.8％。因此，重要的是要考虑土壤种子库以外的其他森林恢复方式。

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