摘要
研究碳的扣留和埋藏速率对全球碳收支平衡预算有重要的意义。为了研究碳的年均扣留量,2007年5月,选择黄河三角洲新生湿地的3种植被,由建林乡附近至河口布设8个剖面,在枯水季节进行剖面原位取样以及含水量、有机碳、总碳和营养成分的实验室分析测试。同时利用黄河三角洲分流河道频繁改动过程中沉积间断所形成的古土壤层作为新生湿地的时间标计算沉积物的沉积速率,从而计算出碳的加积速率。结果表明:虽然湿地沉积物碳的浓度非常低,其总碳与有机碳的浓度分别为<2%和<1%,其土壤的碳氮比为50～53,远高于稳定的湿地土壤同名组分值15～25,但由于研究区较高的沉积速率,其碳的加积速率与世界其它地区的盐沼湿地相当,总碳和有机碳的加积速率分是为594～1771g/(m2·a)和58～228g/(m2·a)。且前者受控于沉积物的沉积速率,与各营养成分总量的加积速率显著相关,而后者主要与有机碳浓度以及其它营养成分Mn、Cu、Zn和Fe等呈显著正相关。该湿地土壤的营养成分可作为湿地演化的端元成分。
Carbon storage or sequestration is important in studying its global carbon cycle and budget. To study annually carbon sequestration, sampling was carried out across three type plants and between depths on 8 soil profiles in the dry season （May, 2007）, where lies in the newly creative salt marsh wetlands form Jianlin to Hekou rural area of the Yellow River Delta. The dating mark——paleosol for the calculation of sediment accretion rate was observed and identified in the field profile based on the sedimentary discontinuity as a result of frequently river course shifting.The lab analyses were focused on organic carbon, total carbon, nutrients and water contents. The wetland sediments were found to contain remarkable low in total and organic carbons （2% for TC, 1% for Corg）, the C： N ratios of the soil were 50~53,and far from the stabilized soil of 15~25. The accretion rates of total carbon and organic carbon are 594~1771g/（m2·a） and 58~228g/（m2·a） respectively, which are comparable to those of the high carbon content marshes due to high sediment accumulation rate. Remarkably, the former was significantly related to sediment and total nutrients accumulation rates, while the later revealed positive correlation with organic carbon contents and other nutrients（Mn,Cu,Zn,Fe and so on）. The nutrient contents of the soil were considered as the end members of wetland succession.
出处
《地质论评》
CAS
CSCD
北大核心
2012年第1期183-189,共7页
Geological Review
基金
国土资源公益性行业科研专项(编号201111023)
国家自然科学基金资助项目(编号40872167)
大地调项目(编号1212010611402)的成果
关键词
有机碳
营养成分
加积速率
新生湿地土壤
黄河三角洲
organic carbon
nutrients
accretion
soil in newly created wetlands
Yellow River Delta
