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首页> 外文期刊>Environmental Conservation >The effect of catena position and stump characteristics on the coppice response of three savannah fuelwood species
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The effect of catena position and stump characteristics on the coppice response of three savannah fuelwood species

机译：链茂植物的位置和树桩特征对三种稀树草原薪材的矮灌木林反应的影响

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摘要

Fuelwood is still the primary energy source for rural households across the savannah biome of Africa. Coppice growth is an important species-specific trait that strongly influences fuelwood production and regeneration, and yet coppice growth patterns are poorly understood in African savannahs. It is therefore vital that factors affecting coppice growth of species, such as environment conditions and harvesting technique, be better understood in order to develop models for sustainable fuelwood use. This study investigated coppice growth and resource allocation strategies in relation to (1) position along the landscape catena and (2) harvesting technique, for three savannah fuelwood tree species: Dichrostachys cinerea, Albizia harveyi and Combretum collinum. The study was conducted in a dystrophic semi-arid savannah in the far north-east of South Africa. A total of 1146 harvested stumps were sampled in topland and bottomland sites in three locations around a rural village. Stump characteristics (diameter and height) and coppice shoot variables (number of shoots, length and diameter of each shoot, length of longest shoot, and diameter of fattest shoot) were measured for each stump. Three soil samples were taken in each site for physical and chemical analysis. No statistically significant differences were found in soil variables between topland and bottomland sites, probably due to low sample size. Coppice resource allocation strategies varied between species. D. cinerea exhibited a 'quantity-driven' strategy, with the production of large numbers of relatively small coppice shoots with high length:diameter ratio (shoot taper function). C. collinum exhibited a 'quality-driven' strategy, characterized by the production of a relatively low number of larger coppice shoots. Coppice growth variables for A. harveyi were intermediate between those of the other two species, suggesting a strategy where allocation of resources to the number and growth of shoots is more balanced. However, allocation of resources relative to the size of the cut stem, indexed by total shoot basal area:stump basal area ratio, did not differ significantly between species. Coppice growth was strongly favoured in bottomland sites for D. cinerea, and to a lesser degree, C. collinum. Catenal position had a negligible influence on coppice growth of A. harveyi. Number of shoots produced increased with cutting height for all three species. For all three species the number of shoots increased with stump diameter, and mean shoot size also increased with stump size for D. cinerea. There was a significant negative relationship between stump diameter and total shoot basal area:stump basal area ratio for A. harveyi and C. collinum. A framework for optimizing different coppice growth variables according to species, catenal position and harvesting technique is given.
机译：薪柴仍然是整个非洲大草原生物群落中农村家庭的主要能源。灌木林的生长是一种重要的物种特有性状，强烈影响薪材的生产和再生，但非洲大草原对灌木林的生长方式知之甚少。因此，至关重要的是，要更好地了解影响树种繁殖的因素，例如环境条件和采伐技术，以便开发可持续薪柴使用的模型。这项研究调查了与（1）沿景观链的位置和（2）采伐技术有关的三种大草原薪材树种的矮树生长和资源分配策略：灰D，Albizia harveyi和Combretum collinum。这项研究是在南非最东北的营养不良的半干旱大草原上进行的。在一个乡村周围的三个地点的顶地和底地站点总共采样了1146个收获的树桩。测量每个树桩的树桩特征（直径和高度）和小枝枝变量（枝数，每枝的长度和直径，最长枝的长度和最胖的枝的直径）。在每个地点采集了三个土壤样品，进行了物理和化学分析。在顶地和底地之间的土壤变量中没有发现统计学上的显着差异，这可能是由于样本量较小所致。灌木林资源分配策略因物种而异。灰褐线虫（D.cinerea）表现出“数量驱动”的策略，产生了大量具有相对高的长径比的较小小灌木林枝（芽锥功能）。 C. collinum表现出“质量驱动”的策略，其特点是产量相对较低，较大的小灌木林芽。哈威曲霉的矮灌木林生长变量介于其他两个物种之间，这表明一种策略可以使资源分配给枝条的数量和生长更加平衡。但是，相对于切茎大小的资源分配（以总茎基面积与树桩基面积之比表示）在物种之间没有显着差异。灰谷病菌在谷底地区强烈生长矮灌木林，而较小程度的谷类梭状芽胞杆菌则更是如此。悬链线位置对哈威曲霉矮灌木丛的生长影响可忽略不计。对于这三个物种，随着芽高的增加，芽的数量增加。对于所有这三个物种，灰褐色D. cinerea的枝条数量均随树桩直径的增加而增加，平均枝条尺寸也随树桩大小的增加而增加。在哈维伊和柯林中，树桩直径与茎总基面积之比与树基面积之比呈显着负相关。给出了根据物种，种类位置和收获技术优化不同林木生长变量的框架。

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