斑地锦和地锦的生长特征及其竞争能力比较研究

通过野外样方调查,比较了入侵种斑地锦和土著种地锦的生长特征和竞争能力.结果表明:斑地锦的有性繁殖效力显著高于地锦,其果穗数和果穗长明显大于地锦,而营养生长效力显著低于地锦,其叶面积则明显小于地锦,说明斑地锦较多地投资于繁殖生长,而地锦较多地投资于营养生长.种间竞争和种内竞争明显降低了入侵种斑地锦和土著种地锦的平均每株果穗数、果穗长、单株地上生物量和单株总生物量,且地锦的种间竞争能力(相对邻里效应指数)显著大于入侵种斑地锦,表明入侵植物斑地锦目前不能对广泛分布的地锦发生竞争取代.

Growth Characteristics and Competitiveness of Euphorbia Maculata Linn and E Humifusa Willd

In this paper,growth characteristics and relative competitive ability between invasive Euphorbia maculata Linn.and native E.humifusa Willd are studied by the intensive field investigation.It is found that,E.humifusa Willd.on higher vegetative growth effort,its mean spike length and spike number are more than those of E.humifusa Willd,whereas the leaf area of E.maculata Linn.is smaller,indicating that E.maculata Linn.is inclined to reproduction growth,but E.humifusa Willd.is apt to vegetative growth.In addition,the intraspecific and interspecific competitions between E.maculata Linn.and E.humifusa Willd.negatively affect various growth parameters such as spike number per plan,tmean spike length,individual's above-ground biomass and its total biomass.Furthermore,the interspecific relative competitive ability measured as relative neighbor effect index of E.humifusa Willd.is significantly higher than that of E.maculata Linn.Accordingly,it is possible that E.humifusa Willd.can not be replaced by E.maculata Linn.at present.