Wheat root growth responses to horizontal stratification of fertiliser in a water-limited environment
Wheat root growth responses to horizontal stratification of fertiliser in a water-limited environment
复制标题
限水环境下小麦根系生长对肥料水平分层的响应
DOI：
10.1007/s11104-014-2249-8
复制
发表时间：
2015-01-01
期刊：
影响因子：
4.9
通讯作者：
Whalley, William R.
中科院分区：
文献类型：
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作者：
Jin, Kemo;Shen, Jianbo;Whalley, William R.
背景和目的我们感兴趣的是确定在水分有限的环境中，不同层次的土壤剖面内的养分富集区的水平分层对根系生长和作物产量的影响。这实际上是相关的大面积的中国，其中许多已被overfertilized.MethodsWe土壤填充rootrons 1.4米深，种植小麦。在0-40、60-100和0-140 cm深度采用三种不同的富营养水平分层。将土壤压实至密度为1.5 g cm−3，基质势为−10 kPa。小麦一直种到干旱末期。低土壤导水率保存水平nutritional stratification. Resultsgrown在rootrons与表层（0-40 cm）的营养物质的植物有最大的根生长，吸水量和产量。当养分均匀分布在整个根区（0-140 cm）时，根系生长仅限于表层。土壤水分的测量表明，这是因为根成为inhibited.ConclusionsNutrient富集的表层是最有效的促进深层根，更高的水分吸收和产量在水分有限的条件下。不均匀的养分分配可以改变根系生长和水分吸收。
Background and aimsWe were interested to determine the effects of horizontal stratification of nutrient-rich zones within different layers of the soil profile in water-limited environments on root growth and crop yield. This is practically relevant to large areas of China, many of which have been over-fertilized.MethodsWe used soil-filled rhizotrons 1.4 m deep to grow wheat. Three different nutrient-rich horizontal stratifications were used at depths of 0–40, 60–100 and 0–140 cm. The soil was packed to a density of 1.5 g cm−3, at a matric potential of −10 kPa. The wheat was grown until it was at terminal drought. Low soil hydraulic conductance preserved the horizontal nutrient stratification.ResultsPlants grown in rhizotrons with a surface layer (0–40 cm) of nutrients had the greatest root growth, water uptake and yield. When nutrients were uniformly distributed throughout the rhizotron (0–140 cm), root growth was restricted to the surface layer. Measurements of soil moisture indicate this was because the roots became impeded.ConclusionsNutrient enrichment of the surface layer was the most effective at promoting deep roots, higher water uptake and yield under water-limited conditions. Heterogeneous nutrient distribution can modify root growth and water uptake.