• ISSN 1008-505X
  • CN 11-3996/S
李韵珠, 王凤仙, 刘来华. 土壤水氮资源的利用与管理 Ⅰ.土壤水氮条件与根系生长[J]. 植物营养与肥料学报, 1999, 5(3): 206-213. DOI: 10.11674/zwyf.1999.0302
引用本文: 李韵珠, 王凤仙, 刘来华. 土壤水氮资源的利用与管理 Ⅰ.土壤水氮条件与根系生长[J]. 植物营养与肥料学报, 1999, 5(3): 206-213. DOI: 10.11674/zwyf.1999.0302
Li Yunzhu Wang Fengxian Liu Laihua, . USE AND MANAGEMENT OF SOIL WATER AND NITROGEN RESOURCESⅠ. Soil Water and Nitrogen Conditions and Root Development[J]. Journal of Plant Nutrition and Fertilizers, 1999, 5(3): 206-213. DOI: 10.11674/zwyf.1999.0302
Citation: Li Yunzhu Wang Fengxian Liu Laihua, . USE AND MANAGEMENT OF SOIL WATER AND NITROGEN RESOURCESⅠ. Soil Water and Nitrogen Conditions and Root Development[J]. Journal of Plant Nutrition and Fertilizers, 1999, 5(3): 206-213. DOI: 10.11674/zwyf.1999.0302

土壤水氮资源的利用与管理 Ⅰ.土壤水氮条件与根系生长

USE AND MANAGEMENT OF SOIL WATER AND NITROGEN RESOURCESⅠ. Soil Water and Nitrogen Conditions and Root Development

  • 摘要: 本文从提高土壤水分和养分资源利用效率出发,研究与此有关的土壤水氮条件与作物根系生长的关系, 以及适宜的水氮范围。根据冬小麦、夏玉米试验结果表明,根长( Lr) 发展动态,根长密度( Lr D) 及其垂直分布和根长/ 冠重比值( Lr/ D Mp) ,均受土壤水氮条件的影响。水氮的严重胁迫,都会使根系发展受抑制,而 Lr/ D Mp 却加大。在水分稍有亏缺条件下,土层中部根长密度增加,但后期衰亡速率也较快。 Lr 和 Lr/ D Mp 的综合评价,可用以衡量根系状况。本文运用 Lr 和 Lr/ D Mp 与水氮条件关系的等值线图的叠加法,将两图高值区的重叠区,作为作物在该生育阶段的适宜指标范围和适宜的水氮范围。

     

    Abstract: From the point of raising the use efficiency of soil water and nutrient, the relation between the roots development of the crops and soil water and nitrogen conditions, and the suitable range of soil water and nitrogen for root growth are studied in this paper. The experiment results from winter wheat and summer corn show that the dynamics of the root length (Lr) development, root length density (LrD) and its vertical distribution and the ratio of root length and the dry weight of the aboveground part of plant (Lr/DMp) are all influenced by the soil water and nitrogen. In the condition of serious stress of soil water and nitrogen, roots development is constrained, but the Lr/DMp ratio is increased. In the condition of slight stress of soil water and nitrogen, the LrD in the subsoil is increased, but the senescence rate of the root is higher during the final growth stage of crops. The comprehensive evaluation of the Lr and Lr/DMp is a nice way to judge the root development. In this paper, the overlay method of the two contour maps (Lr and Lr/DMp versus RW (relative soil water content) and soil mineral N)is used and the overlay area of the high value regions in the two maps indicates the suitable range of indexes for Lr and Lr/DMp and reasonable ranges of soil water and nitrogen.

     

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