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首页> 外文期刊>Plant and Soil >Soil penetration resistance, a suitable soil property to account forTI Soil penetration resistance, a suitable soil property to account for variations in root elongation and branching
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Soil penetration resistance, a suitable soil property to account forTI Soil penetration resistance, a suitable soil property to account for variations in root elongation and branching

机译：耐土壤渗透性，适合TI的土壤特性耐土壤渗透性，适合根伸长和枝条变化的合适土壤特性

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Background and Aims Root system development is affected by soil conditions. The effects of bulk density, water content and penetration resistance on root development processes were investigated in peach trees. Methods Peach tree rootstocks were grown in various soil conditions, combining two bulk densities (1.2 and 1.5 g soil. cm(-3)) and three water contents (0.14, 0.17 and 0.20 g.g(-1) soil). Root parameters (tip diameter, length of apical unbranched zone, branching density and diameters of main and lateral roots) and plant growth (leaves, branches, trunk, root dry mass) were measured. Root growth processes (elongation, branching) were studied using relationships between root parameters. Results The proportion of biomass allocated to each plant compartment was similar whatever the soil conditions. Variations in root development were best explained by the variation in penetration resistance, rather than other soil properties. Increased soil penetration resistance reduced the root elongation rate, especially for thick roots. In addition, the branching pattern was affected. In soil with a high penetration resistance, the root system shape differs from a typical herringbone pattern. Conclusions These results allow quantification of the root system plasticity, and improve our understanding of the interactions between root development and soil properties.
机译：背景和目的根系发育受土壤条件的影响。研究了桃树的堆积密度，含水量和抗渗透性对根系发育过程的影响。方法在各种土壤条件下种植桃树砧木，将两种堆密度（1.2和1.5 g.cm（-3））和三种含水量（0.14、0.17和0.20 g.g（-1））结合在一起。测量了根部参数（叶尖直径，顶端无分支区域的长度，分支密度以及主根和侧根的直径）和植物生长（叶，枝，干，根的干重）。利用根系参数之间的关系研究了根系生长过程（伸长，分支）。结果无论土壤条件如何，分配给每个植物区系的生物量比例均相似。根系发育的变化最好用抗渗透性的变化而不是其他土壤特性来解释。增加的土壤渗透阻力降低了根的伸长率，特别是对于粗根。另外，分支模式受到影响。在具有高抗穿透性的土壤中，根系形状不同于典型的人字形图案。结论这些结果可以量化根系的可塑性，并增进我们对根系发育与土壤特性之间相互作用的理解。

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