Relationship of SPAD,chlorophyll and LMA in Osmanthus fragrans leaves
Leaf mass per unit area(LMA),chlorophyll content,leaf SPAD value and the nutrient content of Osmamthus fragrans var.thunbergii and Osmanthus fragrans var.semperflorens leaves were studied,and the cor-relation of SPAD and chlorophyll content was discussed.The results were as follows.The chlorophyll a / b in O.fragrans var.thunbergii was lower than that in O.fragrans var.semperflorens leaves,but other indicators were higher;each index in leaves of O.fragrans var.semperflorens plants was not significantly different(P0.05),while chlorophyll a,chlorophyll b,total chlorophyll(a + b) and carotenoid content in leaves of different O.fra-grans var.thunbergii plants were significantly different(P0.05);the leaf area of O.fragrans var.semper-florens(16.32 cm2) is less than O.fragrans var.thunbergii(35.37cm2),but the LMA was on the contrary.The leaves are partial to the acidity with pH 5-pH 6;the P and Mg contents in O.fragrans var.semperflorens leaves were higher than those in O.fragrans var.thunbergii leaves,while the calcium and potassium contents were on the contrary.The total chlorophyll content and SPAD values were significantly correlated.At present,the phenome-non of urban heat island was prominent,and O.fragrans var.thunbergii has big leaf areas and strong adaptation to light,which is more suitable to popularize in urban greening.