EFFECTS OF LEAF BLAST ON PHOTOSYNTHESIS OF RICE .2. CANOPY PHOTOSYNTHESIS
EFFECTS OF LEAF BLAST ON PHOTOSYNTHESIS OF RICE .2. CANOPY PHOTOSYNTHESIS
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DOI：
10.1007/bf01974665
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发表时间：
1993-01-01
期刊：
影响因子：
--
通讯作者：
KROPFF, MJ
中科院分区：
文献类型：
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作者：
BASTIAANS, L;KROPFF, MJ
利用田间移动装置测定了水稻叶瘟病菌稻瘟菌对水稻光合速率的影响。接种稻瘟病菌显著降低了样地的冠层CO2交换率（CER）。利用实验得到的数据，对叶片瘟病对冠层光合作用的影响模型进行了评价。该模型包括作物生长机制模型的光合作用和呼吸过程，并扩展了叶片瘟病对这两个过程影响的子模型。利用该模型准确模拟了冠层光合作用和叶片瘟病对CER的影响。分析表明，冠层光合作用减少的主要原因是病害对叶片光合速率的不利影响和病害引起的衰老引起的枯叶面积遮荫。敏感性分析表明，病害在冠层中的垂直分布具有重要意义。这意味着作物损失评估的病害监测应考虑病害的垂直分布。
The effect of Pyricularia oryzae, the causal organism of leaf blast in rice, on photosynthetic rate of a rice crop was determined with mobile equipment in the field. Canopy CO2 exchange rate (CER) was significantly reduced in plots inoculated with P. oryzae. The experimentally obtained data were used to evaluate the performance of a model for the effects of leaf blast on canopy photosynthesis. The model comprised photosynthesis and respiration routines of a mechanistic crop growth model, extended with submodels for effects of leaf blast on both processes. Canopy photosynthesis and the effect of leaf blast on CER were accurately simulated with the model.Analysis showed that the reduction in canopy photosynthesis was mainly due to an adverse effect of lesions on leaf photosynthetic rate and to shading by dead leaf area resulting from disease induced senescence. A sensitivity analysis demonstrated the importance of the vertical distribution of the disease in the canopy. This implies that disease monitoring for crop loss assessment should consider vertical disease distribution.