Ecological Stoichiometry and Reabsorption Efficiency of C,N,and P in Leaves of Different Camellia Oleifolia Strains
The levels of the nutrients C,N,and P and the ecological stoichiometric characteristics and reabsorption efficiency of leaves of Camellia oleifera were analyzed to clarify the nutrient utilization strategies of different Camellia oleifera strains.Three different camellia varieties,C.oleifera'Cenruan 2',C.oleifera'Cenruan 3',and C.osmantha,were used as the re-search objects to analyze the C,N,and P contents,ecological stoichiometric characteristics,and nutrient reabsorption effi-ciency of mature leaves,senescent leaves and litter leaves.The results showed that the C,N,and P contents and ecological stoichiometric characteristics of the three kinds of leaves of C.osmantha were the highest among the three strains,and the nutrient contents of mature leaves and N contents of senescent leaves and litter leaves were significantly different among all strains.The C∶N ratios of the three kinds of leaves of C.oleifera'Cenruan 2'were the highest,those of the mature leaves of C.oleifera'Cenruan 3'were the lowest,and those of the old leaves and litter of C.osmantha were the lowest.There were significant differences in the stoichiometric ratios of N:P in the mature leaves and litters of the three strains,while the differ-ences in the C:N and N:P ratios in the old leaves did not reach a significant level.The reabsorptivity of N and P decreased in the order was C.oleifera'Cenruan 2'>C.oleifera'Cenruan 3'>C.osmantha,and the reabsorptivity of P significantly dif-fered among the three strains.In general,the N:P ratios of the mature leaves of the three strains were between 14 and 16,and their growth was restricted by both N and P.From the perspective of the nutrient content and reabsorption rate of the three kinds of leaves,although the different strains had different nutrient absorption strategies,the nutrients mainly came from the soil,and the amount of N and P applied should be considered in the management of the three strains.C.oleifera'Cenruan 2'can better adapt to local low N and P limits.
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