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首页> 外文期刊>Geoderma: An International Journal of Soil Science >OPAL PHYTOLITHS AS AN INDICATOR OF THE FLORISTICS OF PREHISTORIC GRASSLANDS
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OPAL PHYTOLITHS AS AN INDICATOR OF THE FLORISTICS OF PREHISTORIC GRASSLANDS

机译：蛋白石植物作为史前草原植物学指示

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摘要

A strong relationship between current vegetation and the opal phytolith content of surface soil was established. Opal phytoliths obtained from buried soil surface horizons 200-800 years old were then used to establish a profile of the vegetation present on four sites within Capitol Reef National Park, Utah, USA, prior to European settlement. The plant communities so reconstructed contained more forbs and/or shrubs than present-day communities and were dominated by cool-season rather than warm-season grasses. Although these differences could be due to climate change, the pattern of change from cool-season to warm-season grasses is not consistent with the accepted pattern of climate change. Grazing pressure could account for this change in plant community composition. Livestock tend to graze Capitol Reef in the cool season, and the area is rested from grazing during the warm season. This pattern could account for the decline in cool-season grasses. Phytolith analyses can serve as an alternative method for assessing the impact of management on grasslands. This method is particularly valuable when no comparable ''undisturbed'' control area exists.
机译：建立了当前植被与表层土壤蛋白石植硅体含量之间的密切关系。然后，从200-800年历史的埋藏土壤表层获得的蛋白石植物石被用来建立在欧洲定居之前美国犹他州国会礁国家公园内四个地点的植被概况。如此重建的植物群落比当今群落包含更多的前缘和/或灌木，并且以凉季而不是暖季草为主。尽管这些差异可能是由于气候变化引起的，但从凉季到暖季草的变化方式与公认的气候变化方式并不吻合。放牧压力可以解释植物群落组成的这种变化。在凉爽的季节，牲畜趋向于放牧国会礁，在温暖的季节，该地区不会放牧。这种模式可以解释凉季草的减少。植石分析可以作为评估管理对草原影响的替代方法。当不存在可比较的“不受干扰”的控制区域时，此方法特别有价值。

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