珙桐及其伴生樹燈臺樹的調(diào)落物水提液對彼此幼苗生長的化感效應(yīng)

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中圖分類號： Q 9 4 5 . 3 1 文獻標識碼：A DOI：10.7525/j.issn.1006-8023.2025.03.008

Abstract：Rare and endangered plants have formed a stable association with their associated tree species in the longterm evolution process，butwhetherthis association isrelated toalelopathy producedbylitters is stillunknown.Taking the uniquerareand endangeredplantDavidiainvolucrata Baill.anditsasociated species Cornus controversa Hemsl.in Chinaasresearchobjects，thealelopathic effctsofwaterextracts fromdifferenttypes ofliter（branch liter，leaf litter， and their mixture liter）at natural concentrations on each other'sseedlings 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 frac WANGYJ，AHUetalopthicofterextractfrotlitofiaiourataditssoatedcontroversaon the growth of each other's seedlings[J]. Forest Engineering，2025，41（3）：517-525.

tionofN，andP，whiletheextractsfromleafliterandbranch-leafmixtureliterdidnotshowsignificantpromotionaleffects.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 liter significantly reduced the contents of chlorophyll a and b ，total chlorophyll，leaf massfraction ofN.3） Theallelopathic 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 bybranch liter，and inhibitionbyleafliterand branch-leaf mixture liter，withthe mixture litterexhibiting strongerinhibitoryefects.Thesefindings suggestthatthewater extractsfromdiferenttypesoflitterfrom 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 efects on seedlings.

Keywords：Davidia involucrata；Cornus controversa；allelopathy；litter;seedling growth

0 引言

植物群落中的優(yōu)勢物種與伴生物種共同生長時，關(guān)系常表現(xiàn)為競爭和協(xié)同，二者之間不僅存在對光、養(yǎng)分和水分等資源的競爭，而且還通過凋落物淋溶、根系分泌等途徑釋放次生代謝物對彼此種子的萌發(fā)與幼苗的生長產(chǎn)生積極或消極的影響[1-2]。（剩余16046字）