In order to analyze the competitive relationships among the three hardwood tree species in northeast China, a sample plot of secondary broad-leaved mixed forest with an area of 1 hm2 was set in Heilongjiang Grand Canyon National Nature Reserve. The DBH greater than 5 cm, species, and coordinates of all trees in the sample plot were measured, and the competition intensity was calculated by Hegyi competition index algorithm to examine the relationship between the competition intensity and DBH of three tree species. It provides strong support for the protection of three hardwood tree species in northeast China. The results showed that in the competition between the subject trees and competing trees, the intraspecific, interspecific and average competition intensity of the tree species decreased with the increase of DBH, and the competition intensity was positively correlated with the number of subject trees. The intraspecific competition index, interspecific competition index and total competition index increased with the increase of the number of subject trees. In the competition of the three hardwood tree species, except for the Fraxinus mandshurica, Juglans mandshurica and Phellodendron amurense were the most intense intraspecific competition, and the relationships between the DBH of the subject trees and the competition indexes (intraspecific, interspecific and total) were the power function relationship.
ZHANGS S, DONGL H.Tree height-diameter model for three hardwood tree species in the Zhangguangcai Mountains[J].Forest Engineering,2017,33(4):15-20.
[3]
SABATIAC O, BURKHARTH E.Competition among loblolly pine trees:does genetic variability of the trees in a stand matter?[J].Forest Ecology and Management,2012,263(9):122-130.
[4]
CONTRERASM A, AFFLECKD, CHUNGW.Evaluating tree competition indices as predictors of basal area increment in western Montana forests[J].Forest Ecology and Management,2011,262(11):1939-1949.
[5]
BENGTSSONJ, FAGERSTRÖMT, RYDINH.Competition and coexistence in plant communities[J].Trends in Ecology and Evolution,1994,9(7):246-250.
YAOH F, LUJ, ZENGJ Q,et al.Altitudinal differences in intraspecific and interspecific competition index of natural forests of Quercusaquifolioides in southeast Tibet[J].Scientia Silvae Sinicae,2022,58(8):53-62.
SUJ J, WANGX C.Spatio-temporal variations in climate-growth relationships of three hardwood tree species across the north Zhangguangcai mountains,northeast China[J].Acta Ecologica Sinica,2017,37(5):1484-1495.
DONGL L, ZHAOJ C, WANGC C. et al.Analysis on vertical structure characteristics of Juglans mandshurica secondary forest in eastern Liaoning mountainous area[J].Journal of Southwest Forestry University(Natural Sciences),2023,43(6):91-96.
WANGY T, HUANGZ H, WANGJ,et al.The population structure and dynamic characteristics of Phellodendron amurense in Yanshan mountains[J].Acta Ecologica Sinica,2021,41(7):2826-2834.
XUH, LIUY H.Relationship between diameter class structure and intraspecific and interspecific competitions of precious and endangering Plant Acer catalpifolium [J].Acta Botanica Boreali-Occidentalia Sinica,2018,38(6):1160-1170.
SUNH Y, WANGQ C.Carbon storage of 45-year-old stands in different origins on the west slope of Zhangguangcai mountain[J].Bulletin of Botanical Research,2015,35(3):378-383.
LUOM, CHENS Z.Intraspecific and interspecific competition of Larix olgensis plantations in different age groups[J].Journal of Beijing Forestry University,2018,40(9):33-44.
YANGQ, LIN Y, CHENL,et al.Quantitative classification of plant community and niche characteristics of main species in Dashanbao wetland[J].Journal of West China Forestry Science,2020,49(2):36-42.
YUD Y, FANZ F, MAC L,et al.Intra- and inter-specific competition of Torreya yunnanensis community[J].Journal of Northwest Forestry University,2022,37(1):47-52.
WANGQ, PANP, OUYANGX Z,et al.Intraspecific and interspecific competition intensity in mixed plantation with different proportion of Pinus massoniana and Schima superba [J].Chinese Journal of Ecology,2021,40(1):49-57.
[28]
HEGYIF.A simulation model for managing jack-pine stands[M]//Fries J.Growth models for tree and stand simulation.Stockholm:Royal College of Forestry,1974:74-90.
XINY Y, WEIX L.Dominance in a mixed conifer and broadleaved forest of Qingshan lake,Zhejiang[J].Journal of Zhejiang A & F University,2011,28(4):601-606.
WANGH, DUF, LINH Y,et al.Study on the competitive relations of the main tree species of Parashorea chinensis forest in Xishuangbanna[J].Journal of West China Forestry Science,2014,43(2):58-64.
GAOH J, GAOP S, WANGG M.Intraspecific and interspecific competition of Machilus thunbergii forest in Zhoushan islands[J].Bulletin of Botanical Research,2017,37(3):440-446.
[39]
杜峰,梁宗锁,胡莉娟.植物竞争研究综述[J].生态学杂志,2004,23(4):157-163.
[40]
DUF, LIANGZ S, HUL J.A review on plant competition[J].Chinese Journal of Ecology,2004,23(4):157-163.
ZOUC J, WANGQ L, HANS J.Study on competition relationship between dificators in dark conifer forest in the Changbai mountains[J].Chinese Journal of Applied and Environmental Biology,2001,7(2):101-105.