黑龙江省扎龙湿地及其周边地区土壤碳储量估算与1986年以来的变化趋势研究

Estimation of soil carbon storage and its change since 1986 in Zhalong wetland and its surrounding areas,Heilongjiang Province

以黑龙江省扎龙湿地及其周边地区多目标区域地球化学调查、第2次土壤普查数据为基础,通过不同土地利用方式下土壤全碳、有机碳密度、储量的估算,研究该地区20a来土壤碳库的变化趋势。结果显示:扎龙沼泽湿地区0～100cm土体的有机碳密度约为37 884t/km2;当沼泽地退化为草地或围垦为耕地后,土壤中有机碳的损失率高达66.6%～70.2%;1986—2006年研究区表层土壤(0～0.2m)有机碳储量下降了约21%,而扎龙沼泽湿地区表层土壤有机碳储量则增加了近7%。

On the basis of data obtained from National Multi-purpose Regional Geochemical Survey （NMPRGS） and National Soil Survey in Zhalong wetland and its surrounding areas of Heilongiiang Province, we studied the change of soil carbon storage in the last twenty years, by estimating soil total carbon density（ STCD）, soil organic carbon density（SOCD） and soil carbon storage of different land uses. The results indicated that： （1）SOCD （0 - 100 cm） is about 37884 t/kin^2 in Zhalong wetland; （2）the loss of soil organic carbon was as high as 66. 7%- 70. 2%, when wetland degraded to grass land or crop land; （3） from 1986 to 2006, surface soil （0 - 0.2 m） organic carbon storage decreased about 21% in the study area, while in Zhalong wetland, surface soil （0 - 0. 2 m） organic carbon storage increased about 7%.