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《Journal of Beijing Forestry University》 2002-01
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Nutrient distribution and accumulation pattern of Chinese pine plantation ecosystems in the loess region.

Gao Jiarong; Zhang Dongsheng;Xiao Bin;Niu Jianzhi. College of Resources and Environment ,Beijing For.Univ., 100083, P. R. China  
The contents, accumulation and distribution of 5 nutrient elements (N, P, K, Ca, Mg) were studied in 3 sample plots of Chinese pine plantation in the loess region in Shaanxi Province. The results show that the nutrient content in various organs was in the order of needle branch root bark stem. The stand had a N storage of 319.52?kg/hm 2, P 32.53?kg/hm 2, K 250.02?kg/hm 2, Ca 219.11?kg/hm 2 and Mg 43.54?kg/hm 2. The total accumulation of the elements in the tree layer was 668.75?kg/hm 2, in the shrub layer 0.67?kg/hm\+2, in the herb layer 0.24?kg/hm 2 and in the dead soil covering layer 195.06?kg/hm 2. The enrichment ratios of N, P, K, Ca and Mg in Chinese pine plantation were 3.81, 5.19, 18.78, 1.07 and 4.81 respectively. The net organic production per ton needs these five elements of 9.41~12.19?kg/(hm 2·a).The total nutrient element accumulation in tree layer was 471.27~668.75?kg/hm 2, of which stem occupied about 14.9%~16.7%.
【Fund】: 国家自然科学重点基金 (3 993 0 13 0 );; 教育部博士点基金 (2 0 0 0 0 0 2 2 0 9)资助项目
【CateGory Index】: S718.5
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