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首页> 外文期刊>Journal of Chemical Ecology >Transport of Phenolic Compounds from Leaf Surface of Creosotebush and Tarbush to Soil Surface by Precipitation
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Transport of Phenolic Compounds from Leaf Surface of Creosotebush and Tarbush to Soil Surface by Precipitation

机译：沉淀作用将酚类化合物从杂酚和塔布的叶表面转移到土壤表面

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摘要

During the last 100 years, many desert grasslands have been replaced by shrublands. One possible mechanism by which shrubs outcompete grasses is through the release of compounds that interfere with neighboring plants. Our objective was to examine the movement of secondary compounds from the leaf surface of creosotebush and tarbush to surrounding soil surfaces via precipitation. Units consisting of a funnel and bottle were used to collect stemflow, throughfall, and interspace precipitation samples from 20 creosotebush (two morphotypes) and 10 tarbush plants during three summer rainfall events in 1998. Precipitation samples were analyzed for total phenolics (both species) and nordihydroguaiaretic acid (creosotebush only). Phenolics were detected in throughfall and stemflow of both species with stemflow containing greater concentrations than throughfall (0.088 and 0.086 mg/ml for stemflow and 0.022 and 0.014 mg/ml for throughfall in creosotebush morphotypes U and V, respectively; 0.044 and 0.006 mg/ml for tarbush stemflow and throughfall, respectively). Nordihydroguaiaretic acid was not found in any precipitation collections. The results show that phenolic compounds produced by creosotebush and tarbush can be transported to the soil surface by precipitation, but whether concentrations are ecologically significant is uncertain. Nordihydroguaiaretic acid was not present in the runoff from creosotebush.
机译：在过去的100年中，许多荒漠草原被灌木丛所取代。灌木胜过竞争草的一种可能机制是通过释放干扰邻近植物的化合物。我们的目的是研究次生化合物通过沉淀从creosotebush和tarbush的叶表面到周围土壤表面的运动。在1998年的三个夏季降雨事件中，使用一个由漏斗和瓶子组成的单元收集了20种Creosotebush（两种形态型）和10种tarbush植物的茎流，穿透和空间降水样品。分析了沉淀样品中的总酚（两种）和去甲二氢愈创木酸（仅用于creosotebush）。在两个物种的穿透流和茎流中均检测到酚类物质，其干流的浓度高于穿透率（Creosotebush形态类型U和V的茎流分别为0.088和0.086 mg / ml，穿透量为0.022和0.014 mg / ml； 0.044和0.006 mg / ml分别针对山竹茎流和穿透。在任何降水收集物中均未发现去甲双氢愈创木酸。结果表明，克里索特布什和塔布布什生产的酚类化合物可通过降水转移到土壤表面，但浓度是否具有生态学意义尚不确定。 Creosotebush的径流中不存在Nordihydroguaiaretic酸。

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