欢迎访问林业科学,今天是

林业科学 ›› 2001, Vol. 37 ›› Issue (2): 1-12.doi: 10.11707/j.1001-7488.20010201

• 论文及研究报告 •    下一篇

连香树人工幼林群落营养元素含量、积累分配和循环

潘开文 刘照光   

  1. 中国科学院成都生物研究所,成都610041
  • 收稿日期:1999-06-23 修回日期:1900-01-01 出版日期:2001-03-25 发布日期:2001-03-25

THE DISTRIBUTION AND CIRCULATION OF NUTRIENT ELEMENT CONTENTS AND ACCUMULATION IN THE YOUNG ARTIFICIAL CERCIDIPHYLLUM JAPONICUM COMMUNITY

Pan Kaiwen,Liu Zhaoguang   

  1. Chengdu Institute of Biology,Chinese Academy of Science Chengdu 610041
  • Received:1999-06-23 Revised:1900-01-01 Online:2001-03-25 Published:2001-03-25

摘要:

研究了10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729.82kg·hm-2 a-1、206.72kg·hm-2a-1和523.10kg·hm-2a-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41.3%和44.3%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0.23~0.54、0.57~0.82和2.26~7.63。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

关键词: 连香树, 营养元素, 含量, 积累, 循环

Abstract:

The distribution and circulation of 8 nutrient element contents and accumulation in the 10a artificial Cercidiphyllum japonicum community were studied.The results indicate:(1)The order of average content of elements in organs is Ca>N>Al>K>Mg>P>Fe>Mn.(2)The order of different organs for element accumulation is roots>leaves>stems without barks>barks>branches,and the order of elements accumulation is Ca>N>K>Al>Mg>P>Fe>Mn.(3)The amount of uptake,retention and return of 8 elements in the community is 729 82 kg·hm-2a-1、206.72kg·hm-2a-1 and 523.10kg·hm-2a-1,respectively.(4)51.2% of total return for K is returned through rainfall leaching,55.7%~96.5% of the rests through litter.However,41.3% of total return for Fe and 44.3% for Al is still returned through dead roots,respectively.(5)Utilization coefficient,ratio of return to uptake,circulation period were 0.23~0.54、0.57~0.82 and 2.26~7.63.Meanwhile,the calculating method of nutrient elements returning through leaching was amended,and the uptake coefficient(annual element uptake/annual available element in soil),accumulation coefficient(annual element accumulation/annual available element in soil)and return coefficient(annual element return/annual available element in soil)were put forward.Finally,the calculating method of element circulation for deciduous forest was discussed.

Key words: Cercidiphyllum japonicum, Nutrient elements, Content, Accumulation, Circulation