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In natural communities, plants have complex interactions: in addition to negative interactions due to resource competition, plants can also have positive interactions
through nutrient accumulation, stress reduction and protection from plant-eating animals.
However, relative to the competitive role between plants, ecologists remain unclear
about the prevalence of positive interactions between plants in natural communities.
Positive interaction between plants can promote the performance of species at different stages of colony formation (such as colonization, survival, population growth, etc.
), thereby affecting the structure and dynamics
of the community.
In addition, positive interactions between plants can occur between native plants and invasive alien plants, affecting the success of invasive alien plants and the invasiveness
of communities.
Therefore, it is of great significance
to explore the prevalence of positive interactions between plants in natural communities and its effects on native plants and invasive alien plants at different stages of colonization.
Yin Deyi, assistant researcher of the Ecology Research Center of South China Botanical Garden, Chinese Academy of Sciences, took 480 long-term continuous observation of plant succession community samples as the research object, and analyzed the direction and intensity of the interaction between native plants and exotic plants in the succession process of the sample plots in the past 60 years.
It is found that positive interactions between plants have a similar or even higher prevalence in natural communities than negative interactions between plants
.
At the same time, the relative frequency of positive and negative interactions varies
with the formation stage and between native and exotic species.
Specifically, positive interactions are more prevalent in the early stages of population formation (emergence, survival, colonization) and more prevalent in later stages (population growth) (Figure 1).
The frequency and intensity of positive interactions in native plants were higher than those of alien species (Figure 2), which inhibited the promotion of other alien species by existing alien species in the community
.
That is, native plants benefit more from positive interaction between plants than foreign plants, which reduces the invasiveness
of communities.
The findings have recently been published online in the mainstream international journal Ecology Letters (IF2021: 11.
274
).
The research was supported
by the National Natural Science Youth Foundation of China and the Guangzhou Science and Technology Program.
Links to papers: https://onlinelibrary.
wiley.
com/doi/full/10.
1111/ele.
14127
Figure 1.
Positive interactions between plants are more prevalent than negative interactions in the early stages of colony, and the opposite is true in the
later stages of colony.
Figure 2.
Positive interactions between native plants are higher than those of invasive alien plants
.
