种间竞争对入侵植物银胶菊生长及光合特性的影响

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中图分类号：K903 文献标志码：A 文章编号：1673-5072（2025）03-0231-07

Abstract：In order to investigate the effects of interspecific competition on the growth and photosynthetic characteristics of Parthenium hysterophorus ，five different combinations of native species and invasive species were set up，i. e.，single species of P . hysterophorus，interplant of P . hysterophorus × Medicago sativa，interplant of P .hysterophorus $＼textbf { ＼times } M$ .falcata，interplant of P . hysterophorus × Artemisia lancea $＼textbf { ＼times } M$ ： sativa ，and interplant of P .hysterophorus ×A . lancea ×M . falcata.The growth and photosynthetic indexes， biomass distribution and relative neighbor effect index of P . hysterophorus under different interspecific relationships were measured to reveal the effects of interspecific competition on invasion strategy of P . hysterophorus.The results show that the interspecific relationships between root，stem，leaf and total biomass of P.hysterophorus are allcompetitive under mixed species treatment.The competition intensity of M.falcata against P 、hysterophorus is greater than that of M.sativa. The competition intensity of M.falcata and A lancea combination is greater than that of M.falcata，and is greater than that of M.sativa and A.lancea combination.The interspecific relationship decreases the plant height，leaf area and biomass of P . hysterophorus and inhibits its root growth.Compared with single species of P .hysterophorus，the combination of M.sativa and A. lancea increases the root biomass ratio of P .hysterophorus，but decreases its stem biomass ratio and leaf biomass ratio;the combination of M.falcata and A.lancea increases the leaf biomass ratio but decreases the root biomass ratio and stem biomass ratio of P .hysterophorus.Under mixed species treatment，the Pn，Gs and Tr of P .hysterophorus decreases，while the Ci of P . hysterophorus increases.Therefore， it can be concluded that both M.sativa and M.falcata can inhibit the growth of P .hysterophorus，but the inhibitory intensity of M.falcata is greater;the inhibition of combination of A.lancea and M.falcata on P ： hysterophorus is stronger than that of combination of A.lancea and M.sativa，and is also stronger than that of M. falcata.

Keywords：Parthenium hysterophorus;interspecific competition;invasive plant;biomass allocation;photosynthetic characteristic

生物入侵是全球变化的主要驱动因素，会给入侵地的环境和社会经济造成巨大的损失[12]。（剩余9833字）