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首页> 外文期刊>Biodiversity and Conservation >Relationship between soil-stored seed banks and degradation in eastern Nama Karoo rangelands (South Africa
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Relationship between soil-stored seed banks and degradation in eastern Nama Karoo rangelands (South Africa

机译：土壤存储的种子库与东部Nama Karoo牧场退化之间的关系（南非

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摘要

Landscape, local scale and seasonal composition of soil-stored seed banks of a southern African semi-arid rangeland (Nama Karoo) were investigated through assessment of seed germinated from field-collected soil. Variables included percentage above-ground canopy cover, numbers of seeds germinated, and selected physical and chemical soil characteristics. Organic matter content of soil sampled from under plant canopies (closed-canopy) is significantly higher than that of intercanopy samples (open-canopy). Significantly more seeds germinated from closed-canopy soil samples are compared with those from open-canopy microsites. It is argued that reduction in rangeland canopy cover due to overgrazing ( and resultant erosion through wind and water movement) leads to reduced seed retention by the leaf litter layer and thus by the soil. This degraded resource appears to have gradually lost an inherent 'buffer capacity', undermining attempts at ecological restoration and necessitating concerted and directed efforts to restore these fragile systems.
机译：通过评估田间采集的土壤中发芽的种子，调查了南部非洲半干旱牧场（Nama Karoo）土壤储藏种子库的景观，局部规模和季节性组成。变量包括地上树冠覆盖率，发芽的种子数量以及选定的物理和化学土壤特性。从植物冠层下（封闭冠层）取样的土壤有机质含量显着高于冠间间样（开放冠层）。与闭棚土壤样品中发芽的种子相比，开放棚微型站点中发芽的种子多得多。有人认为，由于过度放牧（以及由于风和水运动造成的侵蚀）导致的牧场冠层覆盖减少，导致叶片凋落物层和土壤的种子滞留减少。这种退化的资源似乎逐渐失去了固有的“缓冲能力”，破坏了生态恢复的尝试，需要采取协调一致的直接努力来恢复这些脆弱的系统。

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