Nutrient addition does not increase the benefits of clonal integration in an invasive plant spreading from open patches into plant communities
Nutrient addition does not increase the benefits of clonal integration in an invasive plant spreading from open patches into plant communities
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添加营养物质并不会增加从开放斑块传播到植物群落的入侵植物中克隆整合的益处
DOI：
10.1111/plb.13034
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发表时间：
2019-08-16
期刊：
影响因子：
3.9
通讯作者：
Huang, Q-Q
中科院分区：
文献类型：
--
作者：
Li, X-X;Fan, Z-W;Huang, Q-Q
克隆整合的好处之一是，连接的分株之间的资源易位促进了在压力条件下生长的分株的生长，但是这种资源易位是否降低了在有利条件下生长的分株的性能尚未产生一致的结果。在本研究中，我们测试了以下假设：当资源有限时，资源转移到受体分株可能会降低供体分株的性能，但当资源丰富时则不会。我们在空间异质竞争条件下种植薇甘菊匍匐茎片段（每个片段由两个分株组成，连接或不连接），使得发育较年轻的远端分株与植物群落竞争生长，而发育较老的近端分株在没有竞争的情况下生长。对于一半的匍匐茎碎片，将缓释肥料颗粒施用于远端和近端分株。在低养分和高养分条件下，当匍匐茎节间完整时，远端分株的生物量、叶片数和匍匐茎长度均较高，而近端分株的生物量、叶片数和匍匐长度均较低。对于整个无性系，两种连接处理之间的生物量、叶数和匍匐茎长度没有差异。连接并没有改变与微甘草远端分株竞争的植物群落的生物量。尽管克隆整合可能会促进金甘菊入侵植物群落，但即使资源相对丰富，资源转移到金甘菊受体分株也会给供体分株带来成本。
One benefit of clonal integration is that resource translocation between connected ramets enhances the growth of the ramets grown under stressful conditions, but whether such resource translocation reduces the performance of the ramets grown under favourable conditions has not produced consistent results. In this study, we tested the hypothesis that resource translocation to recipient ramets may reduce the performance of donor ramets when resources are limiting but not when resources are abundant. We grew Mikania micrantha stolon fragments (each consisting of two ramets, either connected or not connected) under spatially heterogeneous competition conditions such that the developmentally younger, distal ramets were grown in competition with a plant community and the developmentally older, proximal ramets were grown without competition. For half of the stolon fragments, slow-release fertiliser pellets were applied to both the distal and proximal ramets. Under both the low and increased soil nutrient conditions, the biomass, leaf number and stolon length of the distal ramets were higher, and those of the proximal ramets were lower when the stolon internode was intact than when it was severed. For the whole clone, the biomass, leaf number and stolon length did not differ between the two connection treatments. Connection did not change the biomass of the plant communities competing with distal ramets of M. micrantha. Although clonal integration may promote the invasion of M. micrantha into plant communities, resource translocation to recipient ramets of M. micrantha will induce a cost to the donor ramets, even when resources are relatively abundant.