Effect of arbuscular mycorrhiza on inter- and intraspecific competition of two grassland species
Effect of arbuscular mycorrhiza on inter- and intraspecific competition of two grassland species
复制标题
DOI：
10.1007/bf00333217
复制
发表时间：
1996-10
期刊：
影响因子：
2.7
通讯作者：
M. Moora;M. Zobel
中科院分区：
文献类型：
--
作者：
M. Moora;M. Zobel
我们感兴趣的是丛枝菌根（AM）在不同大小的植物之间的竞争中的作用。采用盆栽试验设计，以AM菌根侵染和竞争为处理。选择5周龄的夏枯草幼苗作为目标植物（即研究其对竞争反应的植物），并以下列植物（每个重复13个）作为邻居：（1）10周龄的大P。vulgaris，（2）两种P.（3）一个10周龄的大草莓Fragaria vesca。在小邻居与小目标植物一起生长的实验中，与其他两种处理相比，竞争并没有显著降低目标植物的重量。大邻居的竞争效应是显着的，无论物种（两个老邻居减少目标植物的重量类似），但有一个明显的差异内和种间竞争时，植物菌根。在种内竞争与一个大的邻居，目标植物芽重减少24%，接种AM。因此，AM放大，而不是平衡种内竞争。在种间竞争中与老F. vesca，接种AM比不接种的目标植株地上部重增加22%。结果表明，在一定的土壤条件下，AM可以通过增加种内竞争抑制和减少种间竞争抑制来增加物种多样性。
We were interested in the role of arbuscular mycorrhiza (AM) in the competition between plants of different sizes. A pot experiment of factorial design was established, in which AM root colonization and competition were used as treatments. Five-week-oldPrunella vulgarisseedlings were chosen as target plants (i.e. plants whose response to competition was studied) and the following (13 replicates of each) were used as neighbours: (1) a large, 10-week-oldP. vulgaris, (2) twoP. vulgarisseedlings, and (3) a large, 10-week-oldFragaria vesca. In the experiment where small neighbours were grown together with small target plants, competition did not reduce target plant weight significantly, compared to the other two treatments. The competitive effects of large neighbours were significant, regardless of species (both older neighbours reduced the weights of target plants similarly), but there was a clear difference between intra- and interspecific competition when plants were mycorrhizal. In intraspecific competition with a large neighbour, the target plant shoot weight was reduced 24% when inoculated with AM. Thus, AM amplified rather than balanced intraspecific competition. In interspecific competition with oldF. vesca, the shoot weights of target plants were 22% greater when inoculated with AM than when non-mycorrhizal. The results showed that, for given soil condition, AM might increase species diversity by increasing competitive intraspecific suppression and decreasing the interspecific suppression of small plants by larger neighbours.