亚热带喀斯特森林土壤CO2排放量动态研究

该文用吸收阱法研究了亚热带喀斯特森林土壤CO2排放量在不同季节的昼夜变化规律。得出茂兰喀斯特森林土壤中CO2排放量与气候变化有关，冬春季森林土壤CO2排放量较小，夏秋季土壤CO2排放量大。春季CO2的排放量日均为65．5277mg.m^-2.h^-1,夏季为281.7385mg.m^-2.h^-1,秋季为339.6792mg.m^-2.h^-1,冬季为206.5868mg.m^-2.h^-1。年均排放量为1.9568kg.m^-2.yr^-1。排放量的昼夜变化明显，春季14点至18点排放量最大，18点至22点最小；秋季则为19点至23点排放量最大，凌里3点至7点最小。春夏季白天的排放量大于夜间排放量，秋冬季则夜间排放量大于白天排放量。

A preliminary research on CO2 release in subtropical karst forest soil

An absorb trap way was used to study the trends of CO 2 release in subtropical forest soil, based on the data of located observaiton in Maolan National Nature Reserve, Guizhou Province, China. The following aspects were investigated: the release of CO 2 was low in spring and winter, but high in summer and autumn. The release of CO 2 in spring was from 27.1 149mg.m -2.h -1 to 94.9 022 mg.m -2.h -1, with an average 0865.5 277mg.m -2.h -1. In summer it was from 127.6 942 mg.m -2.h -1 to 446.5 894mg.m -2.h -1, with an average 08 281.7 385 mg.m -2.h -1. In autumn it was from 0 to 657.0 716 mg.m -2.h -1, average 08 339.6 792mg.m -2.h -1. In winter it was from 71.5 163 mg.m -2.h -1 to 595.8 761mg.m -2.h -1, with an average 08 206.5 868 mg.m -2.h -1. The annual average was 1.9 568 kg.m -2.yr -1. The highest point was from 14 to 18 pm. and the lowest point was from 18 to 22 pm. in spring. And the highest point was from 19 to 23 pm. and lowest point was from 3 to 7 am.in autum. The day release was more than night in spring and summer, and vice versa in autumn and winter.