福建秋茄红树林碳氢氮素的动态研究
STUDIES ON DYNAMICS of CARBON,HYDROGEN AND NITROGEN ELEMENTS FOR KANDELIA CANDEL MANGROVE COMMUNITY IN FUJIAN,CHINA
Abstract
本文主要探讨了福建九龙江口20A生人工秋茄红树群落C、H、n素的含量、贮备及年动态。结果表明:(1)秋茄植物体不同组分C、H、n素含量有一定差异,含量范围分别为:C43.81%─51.22%、H4.50%─5.68%、n0.23%─1.80%,组分间差异程度顺序为C<H<n。原子数率为C(1)H(1.11─1.48)n(0.004─0.034)。(2)群落C、H、n素现存总库量分别为7457.53g/M ̄2、837.48g/M ̄2和73.61g/M ̄2,其中地上部分别占59.31%、58.40%和59.54%,地下部分别占40.69%、41.60%和40.46%。(3)群落年净固定C素、结合H素和吸收n素分别为1113.41g/M ̄2、124.37g/M ̄2和16.83g/M ̄2,其中用于群落自身增长而存留的分别为684.88g/M ̄2、77.15g/M ̄2和6.65g/M ̄2,经凋落物年输出的分别为428.53g/M ̄2、47.22g/M ̄2和10.18g/M ̄2。(4)群落年能量净固定量为43544kJ/M ̄2,年O_2净释放量为2969g/M ̄2。 he paper deals mainly with the contents, pool amounts and annual dynamics of C,Hand N elements in 20-year-old Kandelia candel mangrove community in Jiulongjiang RiverEstuary of Fujian,China.The results showed that: 1.The C,H and N contents(%dw )in the various Fractions of the plant were diFFerent.The range of content was:C 43.81%─5.22%,N4.50%─5.68%and N 0.23%─1.80%,withatom ratio C<1> H<1.11─ 48>N<0.004─0.034.2.In the standing crop of the community, the pool amounts of C,N and N were7457.53g/m ̄2, 837.48g/m ̄2 and 73.61g/m ̄2 respectively,among which the aerial part and un-derground part held 4423.36g·C/m ̄2, 489.11g·H/m ̄2, 43.83g·N/m ̄2 and 3034.17g·C/m ̄2,348.37g· H/m ̄2,29.78g· N/m ̄2 respctively.3.The annual dynamics of C, H and N For the community were annual net Fixing1113.41g· C/m ̄2, net binding 124.37g· H/m ̄2,and 16.83g·N/m ̄2;annual retention 684.88g· C/m ̄2,77.15g·H/m ̄2 and 6.65g· N/m ̄2;annual litter exporting 428.53g· C/m ̄2,47.22g·N/m ̄2 and 10.18g·N/m ̄2.4.For the community,the annual net energy production was about 43544kJ/m ̄2 and netO_2 giving out was about 2969g/m ̄2.