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《Acta Ecologica Sinica》 2017-23
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Effects of close-to-nature transformation on biomass and its allocation in Pinus massoniana and Cunninghamia lanceolata plantations

MING Angang;LIU Shirong;LI Hua;ZENG Ji;SUN Dongjing;LEI Liqun;MENG Mingjun;TAO Yi;MING Caidao;Experimental Center of Tropical Forestry,Chinese Academy of Forestry;Institute of Forest Ecology,Environment and Protection,Chinese Academy of Forestry;Guangxi Youyiguan Forest Ecosystem Research Station;  
Close-to-nature transformation is considered one of the most promising options for creating new forest carbon sinks,but the mechanism by which it influences the biomass by changing the forest structure and thereby influencing the ability and potential of the forest for carbon sequestration remains unclear. Therefore,there is an urgent need to understand these key effects of close-to-nature transformation on the biomass for carbon management in plantation ecosystems. Based on a close-to-nature forest of Pinus massoniana plantation(P(CN)) and an unimproved pure stand of P. massoniana(P(CK)),and a close-to-nature stand of Cunninghamia lanceolata(C(CN)) and an unimproved pure stand of C.lanceolata(C(CK)) as the research objects,the biomass and allocation difference of the four forest types were studied using the method of quadrat sampling combined with biomass measurement,aiming to reveal the influence of close-to-nature transformation on forest biomass and its allocation patterns in P. massoniana and C. lanceolata plantation. The results indicated that the biomass and productivity of P. massoniana and C. lanceolata plantations can be significantly increased by close-to-nature transformation,and the biomass of P. massoniana and C. lanceolata forest stands can be increased by 46.71% and 37.24%,respectively,after 8 years. The biomass of the arborous layer dominates the total biomass(95.48%-98.82%),which plays a vital role in the overall change in forest stand ecosystem biomass. The increase in biomass and productivity in the forest is mainly due to the change in the forest stand community structure,which increases the productivity of the arborous layer. Taken together,the results indicate that reasonable management measures can not only improve stand structure and productivity,but also create favorable conditions that enhance vegetation carbon fixation capacity and potential.
【Fund】: 中央级公益性科研院所基本科研业务费专项资金(CAFYBB2014QA033);; 广西林业科技项目(桂林科字[2016]第37号);; 广西自然科学基金项目(2014GXNSFBA118100)
【CateGory Index】: S718.5
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