“Acceptable” Levels of Spotted Knapweed (Centaurea maculosa) Control
“Acceptable” Levels of Spotted Knapweed (Centaurea maculosa) Control
复制标题
斑矢车菊（矢车菊）控制的“可接受”水平
DOI：
10.1017/s0890037x00043074
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发表时间：
1997
期刊：
影响因子：
1.4
通讯作者：
J. Jacobs
中科院分区：
文献类型：
--
作者：
R. Sheley;J. Jacobs
在环境室中，采用三个附加系列实验对蓝束冰草和斑点矢车菊之间的竞争进行了定量研究。使用两个密度矩阵，斑点矢车菊植物变薄的45或90%的原始密度40天后出现。另一个密度组合矩阵没有变薄。间伐后90 d收获所有植株材料。斑点矢车菊的竞争力是蓝穗冰草的四倍。减少斑点矢车菊45%没有改变两个物种之间的竞争关系。我们认为，剩余的矢车菊个体捕获了大部分新的可用资源。百分之九十的减少是必要的，以改变竞争关系，有利于蓝束冰草。成功的综合斑点矢车菊管理必须利用关键的机制和过程，指导植物群落动态，与杂草密度降低，如果社区被转移到那些所需的。
Competition between bluebunch wheatgrass and spotted knapweed was quantified using three addition series experiments in an environmental chamber. Using two density matrices, spotted knapweed plants were thinned by either 45 or 90% of their original densities 40 d after emergence. Another matrix of density combinations was not thinned. All plant material was harvested 90 d after thinning. Spotted knapweed was about four times more competitive than bluebunch wheatgrass. Reducing spotted knapweed by 45% did not alter the competitive relationship between the two species. We believe remaining knapweed individuals captured the majority of the newly available resources. Ninety percent reduction was necessary to shift the competitive relationship in favor of bluebunch wheatgrass. Successful integrated spotted knapweed management must exploit key mechanisms and processes directing plant community dynamics, in conjunction with weed density reduction, if communities are to be shifted toward those that are desired.