北京师范大学学报（自然科学版）2018，Vol.54Issue(1)：56-63,8.DOI:10.16360/j.cnki.jbnuns.2018.01.008
黄河三角洲湿地土壤氮库沿水盐梯度的时空分布特征
Spatial and seasonal changes in soil nitrogen astocks along a water and salinity gradient in the Yellow River Delta,China
摘要
Abstract
Soil samples were collected to the depth of 50 cm in three sampling belts in the Yellow River Delta, including Calamagrostis pseudophragmites wetlands (S1 ), Typha orientalis wetlands (S2 ), Phragmites australis wetlands (S3 ),Tamarix chinensis and Suaeda salsa wetlands (S4 )and Suaeda salsa wetlands (S5)along a water and salt gradient in each sampling belt in four sampling seasons in 2014 and 2015. Total nitrogen contents and other selected soil properties were analyzed to examine the effects of water and salinity changes on soil total nitrogen contents and stocks along the water and salt gradient.Total nitrogen in the top 10 cm soils showed a 'decreasing-then-increasing'tendency along the water and salinity gradient,with the highest level at S2 and the lowest at S4.For the top 50 cm soils,no significant differences in average total nitrogen were observed in five sampling sites (P>0.05).Soil nitrogen contents and stocks generally decreased in both low-and high-salinity wetlands along the soil profile. However, soil nitrogen in medium-salinity wetland increased after an initial decrease.Soil total nitrogen in wetlands with low-and high-salinity mainly accumulated in the top 20 cm soils,accounting for about 50％ of the nitrogen stocks in the top 50 cm soils. However,soil nitrogen stocks of >4050 cm soils in medium-salinity wetlands ranked only second to the 010 cm soils and were higher than other three soil increments.Correlation analysis showed that soil nitrogen contents and stocks were positively correlated with soil moisture,clay,silt and soil organic carbon (P<0.05), but a negative correlation was observed between soil nitrogen and Na+,Mg2+,Cl-,Cl-/SO2-4 ratio,SAR, pH,bulk density,sand and C/N ratio (P<0.05).关键词
黄河三角洲/滨海湿地/水盐梯度/土壤总氮/时空变化Key words
the Yellow River Delta/coastal wetlands/water and salt gradient/soil total nitrogen/spatial and seasonal changes分类
资源环境引用本文复制引用
赵庆庆,白军红,张光亮,王伟,高永超,王加宁,陈贯虹..黄河三角洲湿地土壤氮库沿水盐梯度的时空分布特征[J].北京师范大学学报（自然科学版）,2018,54(1):56-63,8.基金项目
国家重点研发计划资助项目(2017YFC0505906) （2017YFC0505906）
