Comparison of shade tolerance of different broad-leaved tree species under Cunninghamia lanceolata forest
The growth indexes,relative chlorophyll content and chlorophyll fluorescence parameters of Quercus glauca,Quercus gilva,Schima superba,and Phoebe bournei under Cunninghamia lanceolata forest and in the nursery were measured to analyze the shade tolerance of these four broad-leaved tree species.The results showed that the tree height and ground diameter growth of the four species were inhibited when planted under C.lanceolata forest.The ground diameters of Q.glauca,S.superba,and P.bournei had significant differences,and the plant heights of Q.glauca and S.superba had extremely significant differences between under forest and in the nursery.The relative chlorophyll contents of these four kinds of trees under the forest were higher than those in the nursery.The actual photochemical efficiencies(Qy)of PS Ⅱ of the four kinds of trees under the forest were lower than those in the nursery.The initial fluorescence(Fo)was in the order of Q.gilva＜Q.glauca＜P.bournei＜S.superba.Both the maximum fluorescence(Fm)and variable fluorescence(Fv)were in the order of P.bournei＜Q.gilva＜Q.glauca＜S.superba.The four tree species were subjected to a certain degrees of low-light stress,among which P.bournei was affected most severely.Both maximum photochemical efficiencies(Fv/Fm)and potential activities(Fv/Fo)of PS Ⅱ of all four broad-leaved tree species under the forest were lower than those in the nursery,which were P.bournei＜Q.glauca＜S.superba＜Q.gilva.The shade tolerance of the four species evaluated by the comprehensive evaluation of the membership function method showed that the shade tolerance was in the order of Q.gilva＞S.superba＞Q.glauca＞P.bournei.The results provided a basis for the selection of broad-leaved tree species and the adjustment of light environment under C.lanceolata forest.
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