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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。
Studying the rate of carbon sequestration and burial is of great importance to the global budget for carbon budget. In order to study the annual average carbon sequestration, in May 2007, three kinds of vegetation in the newborn wetlands of the Yellow River Delta were selected. Eight sections were arranged from nearby Jianlin Township to the mouth of the river. Samples were taken in situ during the dry season and water content, Carbon, total carbon and nutrients laboratory analysis test. At the same time, using the paleosol layer formed by the sedimentary discontinuities during the frequent alteration of the distributary channel in the Yellow River Delta, the deposition rate of the sediments was calculated as the time scale of the new wetland, and the sedimentation rate of carbon was calculated. The results show that although the concentration of carbon in wetland sediments is very low, the total carbon and organic carbon concentrations are <2% and <1%, respectively, and the soil C: N ratio is 50-53, much higher than that of the stable wetland soil The compositional values ranged from 15 to 25, but due to the higher sedimentation rate in the study area, the carbon accumulation rate was comparable to that in other parts of the world, and the cumulative carbon and total organic carbon accumulation rates were 594-1771 g / m2 · a) and 58 to 228 g / (m2 · a). The former is controlled by the deposition rate of sediments and is significantly correlated with the rate of accumulation of nutrients. The latter is positively correlated with the concentration of organic carbon and other nutrients such as Mn, Cu, Zn and Fe. The wetland soil nutrients can be used as the endmember of wetland evolution.