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首页> 外文期刊>Conservation Biology >Consequences of Buffelgrass Pasture Development for Primary Productivity, Perennial Plant Richness, and Vegetation Structure in the Drylands of Sonora, Mexico
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Consequences of Buffelgrass Pasture Development for Primary Productivity, Perennial Plant Richness, and Vegetation Structure in the Drylands of Sonora, Mexico

机译：Buffelgrass牧场发展对墨西哥索诺拉州旱地初级生产力，多年生植物丰富度和植被结构的影响

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Abstract: In large parts of northern Mexico native plant communities are being converted to non-native buffelgrass (Pennisetum ciliare) pastures, and this conversion could fundamentally alter primary productivity and species richness. In Sonora, Mexico land conversion is occurring at a regional scale along a rainfall-driven gradient of primary productivity, across which native plant communities transition from desert scrub to thorn scrub. We used a paired sampling design to compare a satellite-derived index of primary productivity, richness of perennial plant species, and canopy-height profiles of native plant communities with buffelgrass pastures. We sampled species richness across a gradient of primary productivity in desert scrub and thorn scrub vegetation to examine the influence of site productivity on the outcomes of land conversion. We also examined the influence of pasture age on species richness of perennial plants. Index values of primary productivity were lower in buffelgrass pastures than in native vegetation, which suggests a reduction in primary productivity. Land conversion reduced species richness by approximately 50% at local and regional scales, reduced tree and shrub cover by 78%, and reduced canopy height. Land conversion disproportionately reduced shrub species richness, which reflects the common practice among Sonoran ranchers of conserving certain tree and cactus species. Site productivity did not affect the outcomes of land conversion. The age of a buffelgrass pasture was unrelated to species richness within the pasture, which suggests that passive recovery of species richness to preconversion levels is unlikely. Our findings demonstrate that land conversion can result in large losses of plant species richness at local and regional scales and in substantial changes to primary productivity and vegetation structure, which casts doubt on the feasibility of restoring native plant communities without active intervention on the part of land managers.
机译：摘要：在墨西哥北部大部分地区，本地植物群落正被转换为非原生水牛草（Pennisetum ciliare）草场，这种转变可能从根本上改变初级生产力和物种丰富度。在墨西哥索诺拉，土地转化正发生在降雨驱动的初级生产力梯度的区域范围内，本地植物群落从沙漠灌木丛过渡到荆棘灌木丛。我们使用了配对抽样设计，比较了卫星衍生的主要生产力指数，多年生植物物种的丰富度以及水牛草牧场的原生植物群落的冠层高度剖面。我们在荒漠灌木丛和荆棘灌木丛植被的初级生产力梯度上取样物种丰富度，以检验场地生产力对土地转化结果的影响。我们还检查了牧场年龄对多年生植物物种丰富度的影响。水牛草牧场的初级生产力指标值低于本地植被，这表明初级生产力下降。在地方和区域范围内，土地转化使物种丰富度降低了约50％，树木和灌木的覆盖率降低了78％，冠层高度降低了。土地转换成比例地减少了灌木物种的丰富度，这反映了Sonoran牧场主在保护某些树木和仙人掌物种方面的普遍作法。场地生产力不影响土地转换的结果。水牛草的年龄与牧场内的物种丰富度无关，这表明不可能将物种丰富度被动恢复到转化前水平。我们的研究结果表明，土地转化可能会导致当地和区域范围内植物物种丰富度的大量损失，并使初级生产力和植被结构发生重大变化，这使人们对在没有积极干预土地的情况下恢复本地植物群落的可行性产生怀疑。经理。

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