Modelling cereal root systems for water and nitrogen capture: Towards an economic optimum
Modelling cereal root systems for water and nitrogen capture: Towards an economic optimum
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DOI：
10.1093/aob/mcg033
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发表时间：
2003-02-01
期刊：
影响因子：
4.2
通讯作者：
Robinson, D
中科院分区：
文献类型：
--
作者：
King, J;Gay, A;Robinson, D
小麦根系的定量模型的开发，连接的大小和分布的根系的水和氮的捕获（假设是均匀分布的深度）在籽粒灌浆过程中，并允许估计这种捕获的经济后果进行评估。该模型的一个特点是它使用概括概念，并且只依赖最少数量的参数（每个参数都具有明确的生物学意义）。然后，该模型被用来提供一个经济的敏感性分析可能的目标特性操纵根系。这些特点是：根的深度分布、干物质分配比例、资源捕获系数、开花期地上部干重、比根重和水分利用效率。从目前对参数的估计可以得出结论，作物在土壤深处的细根上进行更大的投资，而在表层的根的增殖较少，将通过获得额外的资源来提高产量。投资于根系的水捕获的经济回报是投资于氮捕获的相同金额的两倍。(C)2003年《植物学年鉴》（Annals of Botany Company）
A quantitative model of wheat root systems is developed that links the size and distribution of the root system to the capture of water and nitrogen (which are assumed to be evenly distributed with depth) during grain filling, and allows estimates of the economic consequences of this capture to be assessed. A particular feature of the model is its use of summarizing concepts, and reliance on only the minimum number of parameters (each with a clear biological meaning). The model is then used to provide an economic sensitivity analysis of possible target characteristics for manipulating root systems. These characteristics were: root distribution with depth, proportional dry matter partitioning to roots, resource capture coefficients, shoot dry weight at anthesis, specific root weight and water use efficiency. From the current estimates of parameters it is concluded that a larger investment by the crop in fine roots at depth in the soil, and less proliferation of roots in surface layers, would improve yields by accessing extra resources. The economic return on investment in roots for water capture was twice that of the same amount invested for nitrogen capture. (C) 2003 Annals of Botany Company.