福建秋茄红树林碳氢氮素的动态研究

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.