Dynamic changes of leaf growth and three physiological indexes of Platanus×acerifolia(Ait.) Willd.were studied in leaf expansion stage.The results show that in leaf expansion stage(April 4 to April 26),the weight...Dynamic changes of leaf growth and three physiological indexes of Platanus×acerifolia(Ait.) Willd.were studied in leaf expansion stage.The results show that in leaf expansion stage(April 4 to April 26),the weight and area of individual leaf increase gradually,and reach their peaks on April 26 and rise to 9.8 and 39.2 times of that in the initial stage,respectively.With the growth of P.×acerifolia leaf,the chlorophyll content has an increasing trend,and the increasing range is great.Protein content and POD activity appear a declining trend,and the declining range is great.All the three physiological indexes have some minor fluctuations.Contents of Chla,Chlb and Chl(a+b) are the highest on April 26 and rise to 3.41,5.91 and 4.00 times of that in the initial stage.Protein content and POD activity reach the lowest points on April 26 and April 16,respectively and decline by 73.42% and 94.41% of the initial stage of leaf expansion.展开更多
Nine Platanus acerifolia (Ait.) Willd. trees growing in the Nanjing Children Teacher’s School, Nanjing,China, were selected to determine the contents of 13 chemical elements both in the 1994’s growth rings,C(Z, t), ...Nine Platanus acerifolia (Ait.) Willd. trees growing in the Nanjing Children Teacher’s School, Nanjing,China, were selected to determine the contents of 13 chemical elements both in the 1994’s growth rings,C(Z, t), and in the soils near the roots, C’(Z, t), of the trees. The results showed that the relationship between C(Z, t) and C’(Z, t) followed the logarithmic linear correlation model, lgC’(Z, t)=a(Z)+b(Z) ig C (Z, t).Based on this model the chrono-sequences of chemical element contents in the soils were reproduced from those in the tree rings; i.e., the dynamic variations in the chemical element contents of the soils at the sites were traced. In this study the chrono-sequences of the chemical elements including Cd, Ph, Mn, Co and Zn in the soils near the roots of a Platanus acerifolia tree from 1957 to 1994 were established, and the background values of Cd, Pb, Mn, Co and Zn in the soil were calculated by taking the lowest values of the chrono-sequences of the element contents as upper limits of the background values.展开更多
文摘Dynamic changes of leaf growth and three physiological indexes of Platanus×acerifolia(Ait.) Willd.were studied in leaf expansion stage.The results show that in leaf expansion stage(April 4 to April 26),the weight and area of individual leaf increase gradually,and reach their peaks on April 26 and rise to 9.8 and 39.2 times of that in the initial stage,respectively.With the growth of P.×acerifolia leaf,the chlorophyll content has an increasing trend,and the increasing range is great.Protein content and POD activity appear a declining trend,and the declining range is great.All the three physiological indexes have some minor fluctuations.Contents of Chla,Chlb and Chl(a+b) are the highest on April 26 and rise to 3.41,5.91 and 4.00 times of that in the initial stage.Protein content and POD activity reach the lowest points on April 26 and April 16,respectively and decline by 73.42% and 94.41% of the initial stage of leaf expansion.
文摘Nine Platanus acerifolia (Ait.) Willd. trees growing in the Nanjing Children Teacher’s School, Nanjing,China, were selected to determine the contents of 13 chemical elements both in the 1994’s growth rings,C(Z, t), and in the soils near the roots, C’(Z, t), of the trees. The results showed that the relationship between C(Z, t) and C’(Z, t) followed the logarithmic linear correlation model, lgC’(Z, t)=a(Z)+b(Z) ig C (Z, t).Based on this model the chrono-sequences of chemical element contents in the soils were reproduced from those in the tree rings; i.e., the dynamic variations in the chemical element contents of the soils at the sites were traced. In this study the chrono-sequences of the chemical elements including Cd, Ph, Mn, Co and Zn in the soils near the roots of a Platanus acerifolia tree from 1957 to 1994 were established, and the background values of Cd, Pb, Mn, Co and Zn in the soil were calculated by taking the lowest values of the chrono-sequences of the element contents as upper limits of the background values.
