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Species clustered together in communities are often directly or indirectly interrelated, and the reciprocal, antagonistic and other interspecific relationships formed by these associations are crucial
for the maintenance of species diversity and community stability.
In tropical and subtropical forest canopies, a particular group of plants is called "epiphyte" because it grows on other plants, and the interspecific relationship between them and the attached host is called "epiphytic relationship"
.
On the one hand, this epiphytic relationship maintains the stability of epiphytic communities through interspecific interactions; On the other hand, once the host is disrupted, it will have a direct impact on
the epiphyte community.
Therefore, exploring the structural characteristics of epiphytic relationship networks and analyzing the role of epiphytic relationship networks in maintaining the stability of epiphytic communities are key issues in the study of epiphytic coexistence mechanisms, as well as the key to
protecting and restoring epiphyte diversity.
To this end, Hu Haixia, a master's student of the Restoration Ecology Research Group of Banna Botanical Garden, under the guidance of researcher Song Liang, took epiphytic moss in the subtropical evergreen broad-leaved forest of Ailao Mountain and the tropical seasonal rainforest of Xishuangbanna as the research object, and adopted the ecological network analysis method.
The network structure characteristics of epiphytic mosses-hosts in two types of forests were analyzed.
The results show that the epiphytic bryophyte-host network presents the structural characteristics of high nesting and low modularity, and there is a clear module division
of the species composition of epiphytic bryophytes in different height regions of host trees.
In addition, compared with tropical seasonal rainforests, epiphytic bryophytes in subtropical evergreen broad-leaved forests are more abundant, the epiphytic relationship network is more complex, and the structural characteristics are
more stable.
The results of the study are based on Structuring interaction n etworks between epiphytic bryophytes and their h osts in Yunnan, SW China published in academic journals specializing in forestry Frontiers in Forests and Global Change
.
On this basis, the researchers took epiphytic vascular plants in the tropical seasonal rainforest of Xishuangbanna as the object, extended the study of epiphytic relationship from species scale to individual scale, and used model simulation method to explore the stability
of epiphytic relationship network structure under different tree host removal scenarios.
The results show that the epiphytic vascular plant-host network exhibits the structural characteristics
of low connectivity and medium modularity.
The nesting of species-level epiphytic networks weakens after standardization, but it is still significantly higher than that of
individual-level epiphytic networks.
Preferential removal of strongly interacting hosts in the network will seriously affect the maintenance of epiphyte community structure, and the network structure characteristics change
sharply when the host removal ratio is close to 8 0%.
It can be seen that the epiphyte-host network can maintain the stability of the community under low intensity interference, but the epiphyte community may collapse
when the interference intensity reaches a certain threshold.
The results of the study are based on Simulated high-intensity phorophyte removal mitigates the robustness of epiphyte community and destroys commensal network structure, published in
Forest Ecology and Management.
The research was jointly funded by the National Natural Science Foundation of China, the Yunnan Basic Research Special Project, and the Yunnan Province Young and Middle-aged Science and Technology Leaders Reserve Talent Program.
We sincerely thank the Xishuangbanna National Field Scientific Observation and Research Station of Yunnan Xishuangbanna Forest Ecosystem and the National Field Scientific Observation and Research Station of Ailao Mountain Forest Ecosystem of Yunnan for their support
for field work.
Figure 1.
Epiphytic vascular plant-host relationship network in seasonal rainforest of Xishuangbanna
Figure 2 Structural changes of epiphytic networks under different host removal scenarios
