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首页> 外文期刊>Open Journal of Ecology >Influence of early dry season fires on primary production in western Serengeti grasslands, Tanzania
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Influence of early dry season fires on primary production in western Serengeti grasslands, Tanzania

机译：坦桑尼亚塞伦盖蒂西部草原早期干旱季节火灾对初级生产的影响

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Short-term, i.e. 4-9 weeks aboveground net primary production (ANPP) temporal patterns during the first post-fire year in western Seren-geti National Park, and potential differences in the factors limiting ANPP between burnt and non burnt grasslands were examined and es-tablished. Fire stimulated growth at early post-fire stages, even during the dry season, July-October and led to larger increments in green phytomass compared to the non burnt grassland at the onset of short rains, Octo-ber-December. Further, ANPP in burnt plots correlated well with the ratio leaf/total standing phytomass suggesting that the accumulation of standing dead material can be a limiting factor to ANPP in burnt grass-lands. However, ANPP in burnt plots was unrelated to rainfall contrary to earlier arguments, but reached peak earlier and declined early in the rain season, perhaps due to the interactive effects of fire and grazing in the area. In non burnt plots, the temporal change in ANPP was more related to rainfall availability, at least until mid-growing season. Also, the phytomass structure differed between burnt and non burnt grasslands, and together with litter did not recover to non burnt levels within the first post-fire year. The study has demonstrated that the desire of the fire man-agement program in Serengeti National Park, which is to supply green forage to both migra-tory and resident populations during dry season is being fulfilled.
机译：在西部塞伦盖蒂国家公园火灾后的第一年中，即短期（即地上净初级生产（ANPP）4-9周）的时间模式，研究了烧毁草原和未烧毁草原之间限制ANPP的因素之间的潜在差异，并es-tablished。火灾在火灾后的早期阶段，甚至在七月至十月的干旱季节，都刺激了火势的增长，并且与短时降雨（十月至十二月）开始时未燃烧的草地相比，绿色植物的增量更大。此外，在烧成地块中的ANPP与叶片/总立草量之比具有很好的相关性，这表明在烧草地中，立死物的积累可能是ANPP的限制因素。然而，与早先的论点相反，在烧成的田地中的ANPP与降雨无关，但是在雨季更早达到顶峰并下降，这可能是由于该地区火灾和放牧的相互作用所致。在非烧田中，至少到生长中期，ANPP的时间变化与降雨的可获得性关系更大。同样，在烧过的草地和未烧过的草地之间，植物的茎线结构也不同，并且在火后的第一年内，凋落物与凋落物没有恢复到未燃烧的水平。该研究表明，塞伦盖蒂国家公园消防管理计划的愿望已经实现，该计划旨在在干旱季节为移民和居民提供绿色牧草。

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