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首页> 外文期刊>Weed technology >Effect of Sclerotinia sclerotiorum on the Interference between Bluebunch Wheatgrass (Agropyron spicatum) and Spotted Knapweed (Centaurea maculosa)
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Effect of Sclerotinia sclerotiorum on the Interference between Bluebunch Wheatgrass (Agropyron spicatum) and Spotted Knapweed (Centaurea maculosa)

机译：菌核菌对蓝麦草（Agropyron spicatum）和斑节菜（Centaurea maculosa）之间干扰的影响。

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Effectiveness of the common soil fungus Sclerotinia sclerotiorum as a biological control for spotted knapweed and its effect on competitive interactions between spotted knapweed and bluebunch wheatgrass were evaluated in a growth chamber study using addition series methods. Total seeding densities ranged from 2000 to 60 000 seeds/m~2. Mean bluebunch wheatgrass plant weight was 3.5 times greater than spotted knapweed weight per plant, respectively. Coefficient ratios estimating species interaction showed bluebunch wheatgrass density had a greater influence than spotted knapweed density on both bluebunch wheatgrass and spotted knapweed weights (2.11 and 0.51, respectively) when not under the influence of S. sclerotiorum. Niche differentiation ratios indicated a lack of resource partitioning between species (1.11). S. sclerotiorum reduced spotted knapweed density by 68 to 80% without reducing bluebunch wheatgrass density. Spotted knapweed weight per plant also was reduced by the addition of S. sclerotiorum (1.4 to 1.2 mg) but there was not a corresponding increase in bluebunch wheatgrass weight. S. sclerotiorum decreased competition between spotted knapweed and bluebunch wheatgrass. This study provides evidence that establishment of bluebunch wheatgrass on spotted knapweed infested rangeland may be improved by combining S. sclerotiorum with high grass seeding rates.
机译：在生长室研究中，使用添加系列方法评估了常见土壤真菌菌核菌作为斑节菜的生物对照的有效性及其对斑节菜和蓝麦草竞争相互作用的影响。总播种密度为2000至60 000粒/ m〜2。蓝水仙草的平均植物重量分别是每株植物斑节菜的重量的3.5倍。估计物种相互作用的系数比显示，在不受链球菌影响的情况下，蓝斑麦草密度对斑wheat小麦草和斑节海藻重量的影响均大于斑节菜丝密度（分别为2.11和0.51）。生态位分化率表明物种之间缺乏资源分配（1.11）。硬化链球菌使斑点状的突触藻密度降低了68％至80％，而又不降低青麦草的密度。通过添加菌核链球菌（1.4至1.2 mg）也可以降低每株植物的斑节菜的重量，但是蓝麦草的重量没有相应增加。 S. sclerotiorum减少了斑节的矢车菊和蓝麦草之间的竞争。这项研究提供了证据，通过结合菌核链球菌和高草播种率，可以改善在斑节菜侵染的牧场上蓝bu麦草的建立。

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