Effect of plot geometry on epidemic velocity of wheat yellow rust
Effect of plot geometry on epidemic velocity of wheat yellow rust
复制标题
小区几何形状对小麦黄锈病流行速度的影响
DOI：
10.1111/j.1365-3059.2008.01954.x
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发表时间：
2009
期刊：
影响因子：
2.7
通讯作者：
C. Mundt
中科院分区：
文献类型：
--
作者：
K. E. Sackett;C. Mundt
田间小区的大小和形状会影响流行病学实验的成本和结果。在以往的研究中，黄锈病（由条锈菌引起的）在小麦（Triticum aestivum）上的流行速度已经在狭长的小区（6.1 m × 73-171 m）中进行了研究。本研究比较了两个地点的61 × 61 m正方形地块与6.1 × 61 m窄地块的扩散。目的是测试地块形状是否对锈病的时空传播有实质性影响。两种曲线图形状和两个位置的速度随时间呈曲线性增加。流行速度与时间的曲线几乎相同的正方形和狭窄的图在逆风和顺风方向。与基于模拟的预期相反，结果并没有表明在正方形地块中疾病传播更快，尽管研究的地块大小可能超出了随着地块面积的增加疾病增加的快速变化。在正方形图的所有八个罗盘方向上，速度也呈曲线增加。结果表明，狭窄的地块，这是大大低于成本比等维图，可能是合理的研究时空传播的小麦条锈病和其他疾病具有类似的流行病学特征。
The size and shape of field plots can impact on both the cost and outcome of epidemiological experiments. In previous studies, epidemic velocity of yellow rust (caused by Puccinia striiformis f.sp. tritici) on wheat (Triticum aestivum) has been examined in long, narrow plots (6·1 m by 73–171 m). The present study compares spread in square, 61 × 61 m plots versus narrow, 6·1 × 61 m plots at two locations. The objective was to test whether plot shape has a substantial impact on spatiotemporal spread of yellow rust. Velocity increased curvilinearly with time for both plot shapes and at both locations. Curves of epidemic velocity versus time were nearly identical in square versus narrow plots in both the upwind and downwind directions. Contrary to expectation based on simulations, the results did not indicate faster disease spread in square plots, though the plot sizes studied may be beyond that at which there is a rapid change of disease increase with increasing plot area. Velocity also increased curvilinearly in all eight compass directions of the square plots. Results indicate that narrow plots, which are substantially less costly than equidimensional plots, may be justified for studying the spatiotemporal spread of wheat yellow rust and other diseases with similar epidemiological characteristics.