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Spatial variability and prediction of soil available nitrogen of different vegetation types

ZHANG Zhen-ming 1,2 ;YU Xin-xiao1;XU Juan1;GAN Jing3;WANG Xiao-ping3;LI Jin-hai3.1 Key Laboratory of Soil and Water Conservation & Desertification Combating of Ministry of Education,Beijing Forestry University,100083,P.R.China;2 College of Nature Conservation,Beijing Forestry University,100083,P.R.China;3 Beijing Municipal Bureau of Landscape and Forestry,100029,P.R.China  
In order to study the spatial variability and prediction of soil available nitrogen(SAN)of different vegetation types,SAN of five different vegetation types was examined using classical statistics and geostatistics.In combination with geographic information system(GIS),the study analyzed the relationship between vegetation type and SAN.Prediction model of SAN was built using Hierarchical Bayesian method.The results showed that:1)SAN decreased with soil depth.Among the five vegetation types,broadleaf forest land had the greatest content of SAN,while the coniferous forest land had the lowest.2)Spatial variability of five vegetation types had no regulation horizontally and vertically,and its range increased with soil depth.3)The distribution of SAN was characterized by strips and patches.SAN had a high distribution in the southwest of research area and the rest of high content was patch distribution.SAN of open forest land,shrub land and coniferous forest land was lower than that of broadleaf forest land and mixed forest land.4)SAN was affected by vegetation type and altitude at certain extent,it increased with the altitude.
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