Comparative Study Of Nutrients In The Leaves Of Schima Superba In Different Type

Changes in contents of plant nutrients is one of the important indicators of plant grovth conditions.Studying on changes in contents of plant nutrients and mutual relationship between them has important implications for developing reasonable and effective fertilization measures,improving the quality of afforestation,economic and ecological benefits,but at the moment,research on the dynanic changes of nutrients contents in the leaves of Schima superba has not yet been published.Based on initial research in supervisor's research group,this article analysis the dynamic changes and regular pattern of nutrient contents in the leaves of Schima superba in the forest natural recovery process to Providing the scientific basis for developing reasonable and effective fertilization measures,improving productivity and ecological benefits of Schima superba by researching the nutrients contents in different levels,different directions and different recovery types.The main results are as follows:1 In the same recovery type,similar changes of macroelements andmicroelements contents in the leaves of Schima superba were found in accordance with upper level>middle level>lower level,and there were significant variations in different levels.In the first recovery type,the contents of C,N,Fes Mn,Zn have significant variations in upper,middle and lower level;The contents of P,Ca,Mg,Cu have significant variations in upper and lower level,middle and lower level,but not in upper and middle level;The content of K has significant variations in upper and middle level,upper and lower level,but not in middle and lower level.In the second recovery type,the contents of C,P,K,Mg,Cu,Zn have significant variations in upper and lower level,middle and lower level,but not in upper and middle level;The contents of N,Ca,Fe,Mn have significant variations in upper and middle level,upper and lower level,but not in middle and lower level.In the third recovery type,the contents of C,K,Mg,Zn have significant variations in upper and lower level,middle and lower level,but not in upper and middle level;The contents of N,P have significant variations in upper and middle level,upper and lower level,but not in middle and lower level;The contents of Ca,Fe,Mn,Cu have significant variations in upper,middle and lower level.In the fouth recovery type,the contents of C,Ca have significant variations in upper and lower level,middle and lower level,but not in upper and middle level;The contents of N,P,Mg,Fe,Cu,Zn have significant variations in upper,middle and lower level;The contents of K,Mn have significant variations in upper and middle level,upper and lower level,but not in middle and lower level.2 In the same recovery type,the contents of macroelements and microelements in the leaves of Schima superba have no significant variations in different directions,and there were inconsistent trends in the contents of C,K,Ca,Mg,Fe,Mn,Cu,Zn,except for similar changes ofN,P were found in accordance with North>South>East>West.3 In different recovery types,there were inconsistent trends in the contents of macroelements and microelements in the leaves of Schima superba.And the contents of C,P,K,Mg,Fe,Mn,Cu,Zn have significant variations in different recovery types,except for N,Ca.4 The constant elements contents in the leaves of Schima superba have characterized by C>N>K>Ca>Mg>P,the microelements contents have characterized by Mn>Fe>Zn>Cu.Results by analyzing the correlation between 10 elements in the leaves of Schima superba showed that there were significantly positive correlations for the following relationship:correlations of C with N,P and Fe,correlations of N and P,correlations of K and Ca,correlations of Fe and Mn,correlations of N and Mn.correlations of Mg and Zn.