辽河三角洲湿地土壤团聚体、颗粒有机质及其碳浓度分布特征  

Aggregation, Particulate Organic Matter and Its Soil Carbon Distribution of the Wetland Soil in Liaohe Delta

作　　者：马雪莹[1,2,3] 叶思源[2,3] 丁玉荣[2,3] 赵全升[1] 丁喜桂[2,3] 袁红明[2,3] 赵广明[2,3] 王锦[2,3] 

机构地区：[1]青岛大学,山东青岛266071 [2]中国地质调查局滨海湿地生物地质重点实验室,山东青岛266071 [3]国土资源部海洋油气资源与环境地质重点实验室,山东青岛266071

出　　处：《中国农学通报》2014年第34期171-177,共7页Chinese Agricultural Science Bulletin

基　　金：国土资源部公益性行业基金(201111023);国家自然科学基金(41240022);海洋地质保障工程项目(GZH201200503)

摘　　要：本研究选取辽河三角洲3种典型湿地来研究不同湿地类型表层土壤团聚体和颗粒有机质的分布及其碳浓度分布特征,通过湿筛法和密度分组法得到不同粒级团聚体和包裹态颗粒有机质的质量分数,同时进行各物理化学参数和有机碳、氮的测定,结果表明:不同湿地类型间团聚体质量分数均以粉-粘团聚体(<53μm)为主,微团聚体(53~250μm)次之,而有机碳浓度则以大团聚体(>250μm)的最大。此外,颗粒有机质的质量分数以矿物结合态有机质(m SOC)的最高(>90%),但其碳浓度最低。一般地,包裹态颗粒有机碳(i POM)远高于团聚体,并且除翅碱蓬湿地的细大团聚体中的细颗粒有机质(250a)的i POM的碳浓度为最高外,其他的随粒级的增大而增高,特别是轻组(LF)有机碳含量最高,其值域范围为174.4~182.0 g/kg。作者提出芦苇湿地土壤的大团聚体多,稳定性最好,因此芦苇湿地土壤固碳能力相对最好。This study investigated the distribution characteristics of soil aggregates and particulate organic matter, soil carbon concentration of three typical wetlands in Liaohe River Delta. By wet sieving and density grouping, we get the percentage of different aggregate fractions and in-particulate organic matter （iPOM）, physical and chemical parameters, organic C, total nitrogen （N）. The results showed that silt- and clay-sized fraction（〈53 μm） took priority in the percentage aggregation of different wetlands, followed by microaggregates （53-250 μm）. Still, the organic C concentration was mainly macroaggregates （〉250 I^m）. Moreover, mineral soil organic C accounted for the most in particulate organic matter （〉90%）, while its C concentration was the lowest. Generally, in-particulate organic matter （iPOM） was much more than aggregate, and the organic C concentration increases with the fraction increasing. Also, light free （LF） had the highest organic C content, ranging from 174.4 to 182.0 g/kg. Particularly, the organic C concentration of fine particulate organic matter in fine aggregate was the highest in Suaeda sa/sa wetland. In conclusion, the reed wetland has the best capacity of carbon sequestration as a result of its largest quantity of macroaggregate and highest stability.

关 键 词：土壤团聚体 有机碳 颗粒有机质 辽河三角洲 

分 类 号：X142[环境科学与工程—环境科学] S15[农业科学—土壤学]