珙桐及其伴生树灯台树的调落物水提液对彼此幼苗生长的化感效应
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中图分类号： Q 9 4 5 . 3 1 文献标识码：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
植物群落中的优势物种与伴生物种共同生长时，关系常表现为竞争和协同，二者之间不仅存在对光、养分和水分等资源的竞争，而且还通过凋落物淋溶、根系分泌等途径释放次生代谢物对彼此种子的萌发与幼苗的生长产生积极或消极的影响[1-2]。（剩余16046字）