WATER-STRESS AS A CONSTRAINT ON GROWTH IN THE POTATO CROP .1. MODEL DEVELOPMENT
WATER-STRESS AS A CONSTRAINT ON GROWTH IN THE POTATO CROP .1. MODEL DEVELOPMENT
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DOI：
10.1016/0168-1923(91)90056-v
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发表时间：
1991-01-01
影响因子：
6.2
通讯作者：
HEILBRONN, TD
中科院分区：
文献类型：
--
作者：
JEFFERIES, RA;HEILBRONN, TD
描述了一个简单的、基于生理学的受水分胁迫限制的马铃薯作物生长和产量模型。在模型中，干物质积累是植物冠层拦截的光与拦截的辐射转化为干物质的系数（C）的乘积。单片叶子的伸展率与热时间有关，用于计算每天的叶面积指数和光截获量。块茎产量是根据干物质分配和块茎干物质浓度（D）的知识来计算的，这两者都是通过植物出苗时积累的热时间来描述的。叶伸长率 C 和 D 根据土壤剖面中剩余的植物可提取水的比例受到限制。检查了模型对其主要参数的敏感性。该模型对用水效率的变化最为敏感。改变土壤剖面中的 C 或可用水量对产量估算的影响较小。
A simple, physiologically based model of the growth and yield of potato crops constrained by water stress is described. In the model, dry matter accumulation is the product of the light intercepted by the plant canopy and the coefficient of conversion of intercepted radiation into dry matter (C). The rate of extension of individual leaves is related to thermal time and used to calculate leaf area index and light interception each day. Tuber yield is calculated from a knowledge of the partitioning of dry matter and of tuber dry matter concentration (D), both of which are described by thermal time, accumulated from plant emergence. Leaf extension rate, C and D are constrained according to the fraction of plant extractable water remaining in the soil profile. The sensitivity of the model to its principal parameters was examined. The model was most sensitive to changes in water use efficiency. Changing C or the amount of available water in the soil profile had smaller effects on the estimate of yield.