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《Journal of Beijing Forestry University》 2008-S2
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Biocycling of N,P and K from mixed forest ecosystem of Quercus acutissima and Platycladus orientalis in Miyun District,Beijing

XIAO Yang1;CHEN Li-hua1;YU Xin-xiao1;WANG Xiao-ping2;QIN Yong-sheng2;CHEN Jun-qi2.1 Key Laboratory of Soil and Water Conservation & Desertification Combating of Ministry of Education,Beijing Forestry University,100083,P.R.China;2 Beijing Forestry and Parks Department of International Cooperation,100029,P.R.China.  
A study on the biocycling of N,P and K in the 12 years old mixed Quercus acutissima and Platycladus orientalis forest ecosystem was conducted in Miyun District of Beijing.The total store of N,P and K in the mixed forest ecosystem is 236 925.10 kg/hm2,in which the store in soil from 0 to 40 cm is 236 601.10 kg/hm2,in litter and plant is 50.71 and 273.25 kg/hm2 respectively.The annual absorption of N,P and K is 26.05,2.47 and 26.44 kg/hm2 successively in which the annual retention is 13.81,1.72,8.90 kg/hm2,the annual return is 12.24,0.75,17.54 kg/hm2.The cycling coefficient of N,P and K is 0.470 1,0.304 3,0.663 7.The recycling period is 12.59,24.33,5.74 years.The enrichment ratio is 3.709 9,1.217 4,0.091 3.
【Fund】: 北京市科委重大项目(D0706001000091);; “十一五”国家科技支撑计划项目(2006BAD03A02)
【CateGory Index】: S718.5
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