《Table 3 Net productivity of T.flousiana plantation and successive rotation plantation of C.lanceola

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《Biomass Productivity of Taiwania flousiana Plantation and Successive Rotation Plantation of Cunninghamia lanceolata in Cutover Forest Land of C. Lanceolata》

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t/ （hm2·a）

As shown in Table 3，the net productivity was 8.49 and5.95 t/（hm2·a），respectively for the 23-year-old T.flousiana plantation and successive rotation plantation of C.lanceolata.The former was 42.69%higher than that of the latter.There was certain difference in the order of net productivity of different organs between the 2 types of plantations.As for the T.flousiana plantation，the order was stems[5.14 t/（hm2·a）]>branches[1.46 t/（hm2·a）]>roots[1.08 t/（hm2·a）]>leaves[0.48 t/（hm2·a）]>barks[0.33 t/（hm2·a）]，and for the successive rotation plantation of C.lanceolata，the order was stems[3.82 t/（hm2·a）]>roots[0.94 t/（hm2·a）]>branches[0.53 t/（hm2·a）]>barks[0.33 t/（hm2·a）]>leaves[0.25 t/（hm2·a）].Although both plantations had the stems had the highest net productivity，the net productivity of the stems of T.flousiana plantation was 34.55%higher than that of successive rotation plantation of C.lanceolata.Therefore，the biomass accumulation speed was much faster in the stems of T.flousiana plantation than that of successive rotation plantation of C.lanceolata，which was more favorable for the management of artificial commercial plantations with the main economic objective of stem cultivation.