引用本文：李通通,叶思源,韩宗珠,袁红明,裴理鑫.2019.辽河三角洲湿地表层沉积物的风化特征及其对生物作用的指示意义[J].地质论评,65(1):40-51. LI Tongtong,YE Siyuan,HAN Zongzhu,YUAN Hongming,PEI Lixin.2019.Weathering Characteristics of the Surface Sediments and Their Indications for Biological Process in the Liaohe Delta Wetlands[J].Geological Review,65(1):40-51.
Weathering Characteristics of the Surface Sediments and Their Indications for Biological Process in the Liaohe Delta Wetlands
Name
Institution
LI Tongtong
1) College of Marine Geosciences, Ocean University of China, Qingdao, Shandong, 266100;2) Key Laboratory of Coastal Wetland Biogeosciences, China Geologic Survey, Qingdao, Shandong, 266071;3) Qingdao Institute of Marine Geology, Qingdao, Shandong, 266071
YE Siyuan
2) Key Laboratory of Coastal Wetland Biogeosciences, China Geologic Survey, Qingdao, Shandong, 266071;3) Qingdao Institute of Marine Geology, Qingdao, Shandong, 266071
HAN Zongzhu
1) College of Marine Geosciences, Ocean University of China, Qingdao, Shandong, 266100
YUAN Hongming
2) Key Laboratory of Coastal Wetland Biogeosciences, China Geologic Survey, Qingdao, Shandong, 266071;3) Qingdao Institute of Marine Geology, Qingdao, Shandong, 266071
PEI Lixin
2) Key Laboratory of Coastal Wetland Biogeosciences, China Geologic Survey, Qingdao, Shandong, 266071;3) Qingdao Institute of Marine Geology, Qingdao, Shandong, 266071；4）China University of Geosciences(Wuhan), Wuhan, 430074
Abstract:Objectives: In order to reveal the relationship among the particle size, major elements, glomalin related soil protein (GRSP) distributions, and to explore weathering characteristics and the control mechanism in Liaohe river Delta．
Methods: 373 surface sediments across the upper delta plain wetlands (UDPW) and shallow sea wetlands (SSW) were collected from study area．The particle size were tested by Master sizer 2000 laser particle size analyzer, and major elements of surface sediments were tested by Axios PW4400 X- ray fluorescence spectrometer, GRSP analyses used Coomassie plus (Bradford) assay method．
Results:The averaged mean grain size (Mz) of sediment in the SSW was 5.22 ± 0.14 Ф, significantly larger than that in the UDPW．Six types were identified for the SSW and river channel, less concentrated than UDPW, where presenting mainly sandy silt and silt, and indicating less sorting degree．The contents of SiO2 and Al 2O3 were the highest in the study area, and the average contents of other elements were generally less than 5%．With the exception of CaO, other constant elements were significant correlated with sediment particle size (p<0.01)；Notably, the mean value of chemical index of alteration (CIA=58.50) of the vegetated UDPW were significantly higher than that of the SSW (CIA=50.17, p<0.05) and the flooding area, where is near bedrock mountains (CIA=52.00, p<0.05)．Moreover, the CIA values were significant correlated with GRSP content (r=0.47, p<0.01)．
Conclusions:The surface sediments of the UDPW are mainly sand silt and silt, while, the surface sediments of the SSW are mainly silty sand and sandy silt due to the influence of tide and wave actions．The contents of CaO、Na2 O and K 2 O in the UDPW were higher than SSW.There were the high correlations between chemical element and grain size．The Na/K ratio and CIA index analyses showed that the sediments in the LHD wetlands were experienced three weathering stages, namely, unweathering, primary and moderate weathering．Moreover, the correlations between CIA values and GRSP content revealed that the important significant role of biological processes in the mineral weathering, and presumably the AMF have made an significant contribution to the nutrient retains in this region．
