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首页> 外文期刊>African Journal of Ecology >Effects of secondary tuber harvest on populations of devil's claw (Harpagophytum procumbens) in the Kalahari savannas of South Africa
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Effects of secondary tuber harvest on populations of devil's claw (Harpagophytum procumbens) in the Kalahari savannas of South Africa

机译：二次块茎收获对南非卡拉哈里大草原上魔爪（Harpagophytum procumbens）种群的影响

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摘要

Devil's claw (Harpagophytum procumbens) is an internationally traded species that is harvested for its secondary tubers. Root extracts are used to treat arthritis and other inflammatory diseases. This study examined population structure, density, growth, mortality, and seed and fruit production in harvested and unharvested populations in the Kalahari savannas of South Africa over 4 years. Plant density and population structure differed significantly between overgrazed and grass-dominated areas, suggesting that the differences may be due to competition for water and nutrients. Experimental removal of secondary tubers (harvest) was not a significant factor for mortality in any of the harvested size classes. Harvest also did not affect growth, although plants in the 3-4 cm size class grew more in both the harvested and unharvested populations. Fruit production was variable; fruits matured only after sufficient rains. Under the conditions of this study, the species appears to be resilient to harvest, with both harvested and unharvested plants surviving. After harvest, both groups recovered and grew (on average) at the same rate. Because of the spatially variable habitat and the plasticity of the plants themselves, a large number of plants over a wide area are required to better understand the species' life history.
机译：魔鬼的爪子（Harpagophytum procumbens）是一种国际贸易的物种，已收获其次生块茎。根提取物用于治疗关节炎和其他炎症性疾病。这项研究调查了南非卡拉哈里大草原4年内收获和未收获种群的种群结构，密度，生长，死亡率以及种子和水果产量。在过度放牧和以草为主的地区之间，植物密度和种群结构存在显着差异，这表明差异可能是由于对水和养分的竞争。在任何收获的尺寸等级中，实验性去除次生块茎（收获）并不是造成死亡率的重要因素。收获也没有影响生长，尽管3-4 cm大小的植物在已收获和未收获种群中的生长都更多。水果产量可变;雨水充足后才能成熟。在这项研究的条件下，该物种似乎对收获具有抵抗力，收获的植物和未收获的植物都可以生存。收获后，两组的恢复和生长速度（平均）相同。由于生境的空间变化和植物本身的可塑性，为了更好地了解该物种的生活史，需要在大范围内安装大量植物。

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