Allelopathic Effects of Water Extracts from the Litter of Davidia involucrata and Its Associated Tree Cornus controversa on the Growth of Each Other's Seedlings

WANG Yujie, WANG Huan, YU Jinglei, LIU Qinsong, XU Xiao

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Forest Engineering ›› 2025, Vol. 41 ›› Issue (03) : 517-525. DOI: 10.7525/j.issn.1006-8023.2025.03.008
Construction and Protection of Forest Resources

Allelopathic Effects of Water Extracts from the Litter of Davidia involucrata and Its Associated Tree Cornus controversa on the Growth of Each Other's Seedlings

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Abstract

Rare and endangered plants have formed a stable association with their associated tree species in the long-term evolution process， but whether this association is related to allelopathy produced by litters is still unknown. Taking the unique rare and endangered plant Davidia involucrata Baill. and its associated species Cornus controversa Hemsl. in China as research objects， the allelopathic effects of water extracts from different types of litter （branch litter， leaf litter， and their mixture litter） at natural concentrations on each other's seedlings were studied. The results revealed that， 1）the water extract from the branch litter of C. controversa significantly promoted the basal diameter and root length growth of D. involucrata seedlings， and increased the contents of chlorophyll a and b， total chlorophyll， leaf mass fraction of N， and P， while the extracts from leaf litter and branch-leaf mixture litter did not show significant promotional effects. 2）The water extract from the branch litter of D. involucrata significantly promoted the basal diameter growth of C. controversa seedlings and increased the contents of chlorophyll a and b， and total chlorophyll， whereas the extracts from leaf litter and branch-leaf mixture litter significantly reduced the contents of chlorophyll a and b， total chlorophyll， leaf mass fraction of N. 3）The allelopathic effect index indicated that different litter types from C. controversa had allelopathic promotional effects on D. involucrata seedlings， the intensity from large to small was branch， branch-leaf mixture， and leaf； the allelopathic effects of different litter types from D. involucrata on C. controversa seedling were varied， showing promotion by branch litter， and inhibition by leaf litter and branch-leaf mixture litter， with the mixture litter exhibiting stronger inhibitory effects. These findings suggest that the water extracts from different types of litter from D. involucrata and C. controversa have distinct allelopathic effects on each other's seedling growth， and the extracts from the two types of branch litter exhibit the greatest allelopathic promotional effects on seedlings.

Key words

Davidia involucrata / Cornus controversa / allelopathy / litter / seedling growth

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WANG Yujie , WANG Huan , YU Jinglei , et al . Allelopathic Effects of Water Extracts from the Litter of Davidia involucrata and Its Associated Tree Cornus controversa on the Growth of Each Other's Seedlings. Forest Engineering. 2025, 41(03): 517-525 https://doi.org/10.7525/j.issn.1006-8023.2025.03.008

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