| In this study, an experiment of maize seed germination and seedling growth under treatment with water extracts from 12 different trees（Eucommia ulmoides, Paulownia fortunei, Populus Canadensis, Acer truncatum, Diospyros kaki, Prunus persica, Zanthoxylum bungeanum, Juglans regia, Prunus armeniaca, Ziziphus jujube, Malus pumila and Pyrus bretschneideri） leaf litters which mixed with soil and decomposed for 120 d was carried out. The germination ratio, speed index of germination, shoot height, root length, shoot dry weight, root dry weight, CAT activity, root activity and chlorophyll content were determined and the allelopathic effects of trees leaf litter on maize were detected. The results indicated that, according to comprehensive analysis of allelopathic effects as a whole, Eucommia ulmoides, Zanthoxylum bungeanum and Pyrus bretschneideri showed obvious inhibitory effects; Paulownia fortunei, Populus Canadensis, Acer truncatum, Juglans regia, Diospyros kaki, Prunus persica, Prunus armeniaca and Ziziphus jujube showed stimulation effect on seed germination and seedling growth at lower concentration, but inhibitory effect at higher concentration; Malus pumila could inhibit seed germination and seedling growth only at concentration 20 mg·mL-1. Therefore, allelopathic effect of trees leaf litter on crops plays an important role and should be considered in constructing interplanting system of trees（fruits） and crops. When choosing trees（fruits） to interplant with maize, Eucommia ulmoides,Zanthoxylum bungeanum and Pyrus bretschneideri should be avoided, while Paulownia fortunei, Populus Canadensis, Acer truncatum, Juglans regia, Diospyros kaki, Prunus persica, Prunus armeniaca, Ziziphus jujube and Malus pumila could be chosen, but the interplanting density should not be too high. |
