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首页> 外文期刊>Plant Ecology >Fine roots of Prosopis flexuosa trees in the field. Plant and soil variables that control their growth and depth distribution
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Fine roots of Prosopis flexuosa trees in the field. Plant and soil variables that control their growth and depth distribution

机译：Prosopis Flexuosa树的细根在领域。 控制其生长和深度分布的植物和土壤变量

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摘要

Fine root growth in natural vegetation is difficult to predict due to its regulation by soil and plant factors. Field studies in arid ecosystems show a variety of root responses to soil resources and to plant aboveground phenology that sometimes differ from root responses predicted by controlled experiments. There is a pressing need to cover a greater diversity of plant species and ecological scenarios in field studies. In this paper, we have studied fine roots of Prosopis flexuosa trees living with or without access to phreatic water in an inter-dune valley and a dune flank, respectively, in the Central Monte Desert, Argentina. We have described fine root growth over time and at different depths by rhizotron observations and soil core auger samples in relation to soil water and nutrients, tree crown phenology, plant water and nutrient status. We have found that surface soil moisture from rainfall is the variable that best predicts seasonal topsoil fine root growth. Access to groundwater advanced leaf sprouting with respect to rainfall, but did not advance root growth that stayed linked to rainfall in valley and dune flank trees. Trees without access to phreatic water produced deeper and thicker or denser roots, which is consistent with the poor soil resource content of dunes. Variations in rainfall dynamics due to global climate change may have a particular impact on fine roots and ecosystem processes such as biogeochemistry and carbon budget in dune flank trees as well as in valley trees.
机译：由于土壤和植物因素的调节，难以预测自然植被的细根生长。干旱生态系统的田间研究显示了对土壤资源的各种根系反应以及种植面上的候选，有时与受控实验预测的根响应不同。有必要在现场研究中涵盖更大的植物物种和生态情景。在本文中，我们研究了在阿根廷中央蒙特沙漠中的沙漠谷和沙丘侧翼的潜水或没有进入的Prosopis Flexuosa树的精美根。随着时间的推移和不同深度的细根生长和土壤核心螺旋钻样品，与土壤水和养分，树冠候选，植物水和营养状况不同。我们发现降雨的表面土壤水分是最能预测季节性表土细根生长的变量。进入地下水先进的叶片萌芽，降雨，但没有提高根本增长，与谷和沙丘侧面树的降雨保持联系。无需进入潜水的树木产生更深层次或更厚或更密集的根，这与沙丘的不良土壤资源含量一致。由于全球气候变化导致的降雨动态的变化可能对细化和生态系统和沙丘侧面树以及山谷树的生物地球化学和碳预算产生特别影响。

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