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Nutrient accumulation and distribution in Taiwania flousiana and Cunninghamia lanceolata plantation

HE Bin,LUO Liu-juan,LIANG Ji,DENG Rong-yan,DIAO Hai-lin,CHEN Yu-ping,RONG Yi (College of Forestry,Guangxi University,Nanning,Guangxi 530004,China)  
The contents,accumulation,annual net accumulations and distribution of five nutrient elements (N,P,K,Ca and Mg) in Taiwania flousiana and Cunninghamia lanceolata (the second generation) plantation at fast growing stage (11-year-old) of same habitats were studied in Nandan Shankou Forestry Farm of Guangxi,China.The results showed that the nutrient content in various organs of T.flousiana and C.lanceolata was in the order of leavesstem barkbranchrootstem wood.The content of N was the highest among the five elements,followed by Ca and K and Mg,while P was the lowest in various organs of T.flousiana and C.lanceolata.The total nutrient storage of T.flousiana plantation was 573.40 kg·hm-2,which was evidently higher than that of C.lanceolata plantation (330.33 kg·hm-2),of which overstorey of T.flousiana trees stored 517.97 kg·hm-2 and accounted for 89.91%,and forest floor stored 11.07 kg·hm-2 and accounted for 1.92%,and standing litter stored 47.09 kg·hm-2 and accounted for 8.17%.The amount of nutrient elements in different parts of trees was in the order of leavesbranchstem woodstem bark or root for T.flousiana and C.lanceolata plantation.Nutrient annual net accumulation in T.flousiana plantations was 47.09 kg·hm-2·a-1,1.77 times as great as that of the C.lanceolata plantations (26.55 kg·hm-2·a-1).The nutrient utilization efficiency of T.flousiana plantations was lower than that of C.lanceolata plantations,but evidently higher than that of Pinus massoniana,Robinia pseudoacacia and Acacia mangium plantations.
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