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研究了 1 0年生连香树人工群落 8种营养元素的含量、积累分配和循环。主要结论是 :( 1 )连香树营养器官中各种元素的平均含量顺序为Ca>N >Al>K >Mg>P >Fe >Mn。 ( 2 )元素量在各营养器官的分配顺序为根 >叶 >去皮干 >皮 >枝 ,各元素含量顺序为Ca>N >K >Al>Mg>P >Fe >Mn。 ( 3)连香树群落 8种元素的吸收量、存留量和归还量分别是 72 9 82kg·hm- 2 a- 1 、2 0 6 72kg·hm- 2 a- 1 和 52 3 1 0kg·hm- 2 a- 1 。 ( 4) 51 2 %的归还总K量靠降水淋溶归还 ,其余元素总归还量的 55 7%～ 96 5%靠凋落物归还。Fe、Al归还量的 4 1 3%和 4 4 3%通过死根归还。 ( 5) 8种元素的利用系数、归还比和周转期分别为 0 2 3～ 0 54、0 57～ 0 82和 2 2 6～7 63。文中改进了降水淋溶归还的算法 ,提出了群落归还系数、积累系数和吸收系数 ,讨论了落叶树种元素生物循环的算法
The content, accumulation, distribution and circulation of eight kinds of nutrients in the 10-year-old Artemisia artificiality community were studied. The main conclusions are as follows: (1) The average content of various elements in the vegetative organs of C. sinensis is Ca> N> Al> K> Mg> P> Fe> Mn. (2) The distribution order of elements in the vegetative organs is root> leaf> peeled stem> peel> branch. The order of elements is Ca> N> K> Al> Mg> P> Fe> Mn. (3) The uptake, storage and return of eight elements of the fragrant tree community were 72 9 82kg · hm-2 a-1, 2672kg · hm-2 a-1 and 52 3 1 0kg · hm - 2 a- 1. (4) 51 2% of the total K returned by precipitation leaching return, the rest of the total return of 55 7% ~ 96 5% by litter return. 41.3% and 44.3% of Fe and Al restocked were returned through the dead root. (5) The utilization coefficient, return ratio and turnover period of the eight elements are 0 2 3 ~ 0 54,0 57 ~ 0 82 and 2 2 6 ~ 7 63, respectively. In this paper, the algorithm of precipitation leaching and returning is improved, and the community return coefficient, accumulation coefficient and absorption coefficient are proposed. The algorithm of elemental biological cycle of deciduous tree species is discussed