Distribution of Soil Carbon and Nitrogen under Different Water Conditionsin Alpine Salty Wetlands, Northern Tibet Plateau
At present,studies on soil properties in alpine wetlands concentrated on those inalpine peat wetlands.However,less was known about soil carbon and nitrogen in alpine salty wetlands.To determine the vertical distributions of soil organic carbon(SOC)and total nitrogen (TN) in natural salty wetland to increase of soil water levels,soil samples(0 ～50 cm)from three water levels were collected in a typical salty soil on Xainza County of Northern Tibet,which was no water area (NWA),seasonal water area (SWA),perennial water area (PWA).We found that SOC and TN contents gradually reduced with the rise of water levels.In NWA and SWA,the highest SOC and TN contents appeared in surface soil layer (0 ～ 10 cm),and their contents show a decreasing trend with the deeper of the soil layer.In PWA,SOC and TN contentshad fewer differences in five soil layers.Compared with C and N in meadow soil and peat soil,SOC and TN storages were lowerin salty soil (0 ～50 cm).In detail,the values of SOC storage were 7.60 kg/m2 in NWA,4.11 kg/m2 in SWA and 2.35 kg/m2 in PWA,and the values of TN storages were 0.56 kg/m2 in NWA,0.28 kg/m2 in SWA and 0.19 kg/m2 in PWA.Generally,high soil moisture,high salinity and low air temperature lead to less carbon and nitrogen accumulations in alpine salty wetland soil.
Northern Tibet Plateaualpine salty wetlandswater levelsoil organic carbontotal nitrogen
NETL
NSTL
万方数据
维普
