MODELING THE COMPETITION FOR LIGHT AND NITROGEN BETWEEN RICE AND ECHINOCHLOA CRUS-GALLI
MODELING THE COMPETITION FOR LIGHT AND NITROGEN BETWEEN RICE AND ECHINOCHLOA CRUS-GALLI
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DOI：
10.1016/0308-521x(92)90046-q
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发表时间：
1992-01-01
影响因子：
6.6
通讯作者：
HILL, JE
中科院分区：
文献类型：
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作者：
GRAF, B;HILL, JE
水稻（Oryza sativa L.）与稗草（BYG; Echinochloa cross -galli (L.)）对光氮的竞争测定。ssp。用模拟的方法描述了灌溉水稻田中的蛭形虫（Hispidula）。(1)采用考虑分蘖产量和每个分蘖上叶、茎、根和籽粒生长的同一植物模型，模拟水稻和白杨的生长发育。(2)对光的竞争取决于植株高度和垂直叶面积分布，分别表示为水稻吸收入射光的份额和BYG吸收入射光的份额。(3)氮素的竞争是基于水稻和白杨探索根系空间的比例，并由各自的根质量估算。(4)该模型最初是为水稻开发的，在不同密度的单一栽培中也得到了验证。(5)将模型预测的竞争水稻和BYG的生物量生长与替代试验的田间数据进行了比较。(6)在不同的水稻种植密度和不同的水稻种植密度下，考察了杨柳草竞争对水稻产量的影响。虽然该模型以一种简化的方式解释了竞争过程，但它正确地预测了单一栽培中两种植物以及相互竞争时生物量增长的一般趋势。它被证明是研究和解释水稻- byg相互作用的有用工具。
The competition for light and nitrogen between rice (Oryza sativa L.) and barnyardgrass (BYG; Echinochloa crus-galli (L.) Beauv. ssp. hispidula) in an irrigated paddy is described by means of simulation. (1) Growth and development of both rice and BYG are simulated with the same plant model which accounts for tiller production and for muss growth of leaf, culm, root, and grain on each tiller. (2) Competition for light depends on the plant height and the vertical leaf area distribution, and is expressed as the share of incident light absorbed by rice and BYG, respectively. (3) Competition for nitrogen is based on the proportion of root space explored by rice and BYG and is estimated from the respective root mass. (4) The model, originally developed for rice, is validated here for BYG planted in monoculture at different densities. (5) The model predictions on biomass growth of competing rice and BYG are compared to field data collected in a replacement experiment. (6) The effect of BYG competition on rice yield is demonstrated for various rice and BYG planting densities.Although the model accounts for the competition processes in a simplified way, it predicts correctly the general trends of biomass growth of both plants in monoculture as well is when competing with each other. It proves to be a useful tool to investigate and explain rice-BYG interactions.