Influence of Hydrological Processes on the Spatial Distribution of Soil Nutrients in the Riparian Wetlands Buffering of Wuyu'er River

GUO Yue-dong~1,HE Yan~2,DENG Wei~1,PANG Ji-hua~1,ZHANG Guang-xin~1(1.Northeast Institute of Geography & Agro-Ecology,CAS,Changchun 130012;2.CAS,Beijing 100864,China)

Wetlands buffering;Soil nutrients;Hydrological processes;Spatial heterogeneity

The author has analysed spatial heterogeneous characters of soil organic matter,total nitrogen(TN),total phosphorus(TP) in the vertical direction to wetland river in two sample belts in a natural runoff and a artificial management area,respectively.The results showed that soil organic matter,TN and TP put up high spatial heterogeneous characters and trend of cumulaion-subdution in surface layer under the effect of hillslope runoff and river inundation,and the soil organic matter,TN,TP within 0-15cm layer had more clear trend of cumulaion-subdution than that within 15-30cm layer,meanwhile,the trend of cumulaion-subdution in Hata,Long'anqiao sample areas in natural runoff area was more clear than in Shijiadian,Longpaozi sample areas in artificial management area. lndex of spacial export/acumulation was applied to quantify the trend of acumutation-subdution of soil nutrients,and discusse the influence of different soil types,wetland hydrological regime and vegetation community characters in wetland buffering on the spatial heterogeneous characters of soil nutrients.