摘要
对乌梁素海沉积物现场采样和室内实验分析,研究了乌梁素海表层沉积物30 cm中有机碳空间分布以及碳储量特征,分析了有机碳来源以及总氮、总磷、水生植物、沉积物质地对湖泊沉积物碳固定的影响。结果发现,全湖有机碳密度空间分布明显,总体呈现湖区北部高于南部,在湖心处其密度最高。在垂直剖面上,有机碳含量随着深度递减,表层大于底层。沉积物中C/N比率在9～36之间,平均值为20.2。有机碳有内源和外源,其中外源为主导。乌梁素海沉积物有机碳沉积速率为169.55 g.m-2.a-1,有机碳密度为5.21 kg m-2,30 cm深度沉积物中,碳储量为134.39×104t。乌梁素海沉积物固碳能力与总氮存在明显的正相关性,而与总磷没有相关性,说明总氮与有机碳具有同源性,总氮主要以有机氮形态存在。有机碳含量主要吸附在沉积物粘粒中,其中全湖<63μm和63～125μm颗粒中的有机碳含量占总粒径有机碳量的51%和22%。乌梁素海水生植物以芦苇为主,其面积占湖区近1/2,随着近30年来了芦苇面积的增加,促进了沉积物固碳能力。
Based on the on-site sampling and laboratory experiments in Wuliangsuhai Lake, this paper studies the characteristics of the TOC distribution in the 30 cm sediment of and carbon sequestration and the relationship with TN, TP, aquatic plants and sediment texture, as well as the sources of organic carbon. The results showed that the SOC distribution has a certain regularity, in the north Lake is higher than the south, enriched in the middle of lake. On the vertical profile, TOC are decreasing with increasing depth of sediment in the vertical direction. TOC/TN ratios of surface sediments change from 9 to 36, average is 20.2. It related that the source of TOC is mainly to endogenous and exogenous, the exogenous is dominant. Organic carbon deposition rate in the sediment of Wuliangsuhai Lake is 169.55 g.m2.a-1. Organic carbon density is 5.21 kg.m-2, and carbon stored in 30 cm depth of the sediments, is 134.39× 10^4 t. There are significant positive correlation between TOC and TN, which related that TOC and TN have same source, total nitrogen exist mainly in organic nitrogen forms. TOC content is mainly absorbed in cosmid. The 51% and 22% of TOC content is in the 〈63 jma and 63 ~ 125 Ign cosmids respectively. In the Wuliangsuhai Lake, reeds is the mainly aquatic plants, which measure of area is achieve half of the whole lake area. With increasing of reed area in nearly 30 years, it promoted the sediment carbon sequestration capacity.
出处
《生态环境学报》
CSCD
北大核心
2013年第2期319-324,共6页
Ecology and Environmental Sciences
基金
国家自然科学基金项目(40901262
50569002
50669005
51069007
51269017
51269016)
关键词
湖泊
湿地
干旱区
有机碳
碳储量
沉积物
乌梁素海
lake
wetland
arid areas
TOC
carbon storage
sediment
Wuliangsuhai Lake
