Ecological Stoichiometric Characteristics of Leaf Elements in 40 Fujian Tea Tree Cultivars
[Objective]Assimilation of elements by 40 tea cultivars in Fujian in relation with ecology was analy-zed.[Method]The contents and stoichiometric ratios of C,N,P,and K in leaves of 40 varieties of tea plants in Fujian were determined for principal component and cluster analyses.Data obtained were evaluated based on 10 selected indicators including contents of C,N,P,and K and ratios of C/N,C/K,C/P,N/K,N/P,and P/K.[Result]Aside from P,C/K,N/K,and P/K,all indicators on the contents of organic C and total N,P,and K as well as the stoichiometric ratios were found normally distributed in the tea leaves.Of the 40 tea varieties,10 were N-limited with a N/P<14,and 25 P-limited with N/P>16.At the critical Euclidean distance of 17,the teas were clustered into 3 categories,i.e.,the N-limited Group Ⅲ and the P-limited Group Ⅰ and Group Ⅱ that comprised 75％of the total.The top 3 principal indicators provided for 91.88％of the total variance explained.The top 6 tea varieties ranked in the order of Jinmudan>Daye-wulong>Chaoyang>Jinguanyin>Tieguanyin>Dahongpao,which agreed with the result base on the N and P contents.[Conclusion]N,P,and N/P of tea leaves appeared to be the crucial indicators for the eco-stoichiometric evaluation in cultivating,selecting,and breeding teas.
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