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首页> 外文期刊>Plant and Soil >Douglas-fir root biomass and rooting profile in relation to soils in amid-elevation area (Beaujolais Mounts, France)
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Douglas-fir root biomass and rooting profile in relation to soils in amid-elevation area (Beaujolais Mounts, France)

机译：高海拔地区花旗松的根系生物量和生根特征与土壤的关系（法国，博若莱山）

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Douglas-fir is the main reforestation species in the French Massif Central area (14 000 ha), but little is known about its rooting strategy in different soil conditions. This information has important implications for the choice of better soils for settling Douglas-fir, and consequently limiting risks of failure, pests or diseases. As a result, the influence of edaphic conditions on rooting patterns of dominant Douglas-fir was studied over a large range of ecological conditions in a mid-elevation area of the French Massif Central (Beaujolais Mounts). Root systems were studied extensively using the trench profile wall technique and the sector method in 74 pure and evenly aged Douglas-fir stands. The stands were chosen as being representative of soil conditions among 165 stands in an auto-ecological study. The rooting patterns were related to seven typical soil profiles, and to root profile groups. Results stressed that edaphic constraints due to substratum and soil structures have a strong influence on root system morphology. Important variations in root biomass and vertical distribution were highlighted among soils. Small fine root biomass is maximal for soils with no major edaphic constraints. The vertical distribution of fine root biomass is positively correlated for some soil types with organic C, total N, and most cations. For some types it was negatively correlated with the amount of exchangeable aluminum and coarse fragments, and with constraining rock facies. Harsher soils however, showed no correlation between soil chemical variables and fine-root biomass. A practical implication is that Douglas-fir seems to be a pliable and adaptive species: variation in habit and root system biomass are considerable within a study area which was presumed uniform.
机译：花旗松是法国地块中部地区（14000公顷）的主要造林树种，但对其在不同土壤条件下的生根策略知之甚少。这些信息对于选择更好的土壤来定居道格拉斯冷杉具有重要意义，从而限制了失败，虫害或疾病的风险。结果，在法国地块中部（博若莱山）中部高海拔地区的大范围生态条件下，研究了灌溉条件对优势花旗松生根方式的影响。使用沟槽轮廓墙技术和扇形方法在74个纯正和均匀老化的道格拉斯冷杉林中广泛研究了根系。在自动生态研究中，从165个林分中选择了林分作为土壤条件的代表。生根模式与七个典型的土壤剖面以及根剖面组有关。结果强调，由基质和土壤结构引起的土壤侵蚀对根系形态有很大影响。强调了土壤间根系生物量和垂直分布的重要变化。在没有主要土壤约束的土壤中，细小的细根生物量最大。细根生物量的垂直分布与某些土壤类型与有机碳，总氮和大多数阳离子呈正相关。对于某些类型，它与可交换铝和粗碎屑的数量以及岩石相的约束负相关。然而，Harsher土壤显示土壤化学变量与细根生物量之间没有相关性。一个实际的暗示是，花旗松似乎是一种柔韧性和适应性强的物种：习性和根系生物量的变化在一个被认为是统一的研究区域内是相当大的。

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