Distribution Of Ca, Mg, S Nutrients In Soils And Needles Of Pinus Koraiensis Plantations In Northeast China

An experiment was selected soils and needles in pinus koraiensis to study the spatial distribution characteristics of Ca, Mg, S in different terrain conditions. The results showed that:(1) For the mountainous environment, the horizontal distribution characteristics of exchangeable Ca2+, exchangeable Mg2+ in soils were associated with the slope positions, the content of uphill was higher than downhill. For the hummock and falt ground environment, the horizontal distribution characteristics of exchangeable Ca2+, exchangeable Mg2+ in soils were associated with the elevation, the content of exchangeable Ca2+, exchangeable Mg2+ in soils were almost all increased with the lower elevation. The content of effective S in soils had no obvious distribution law. For different terrain conditions, in 0-20 cm and 20-40 cm depth, the content of soil exchangeable Ca2+, exchangeable Mg2+ and effective S in the hummock environment were higher, in 40-60 cm depth, the content of soil exchangeable Ca2+ and exchangeable Mg2+ in the mountainous environment were higher, the content of soil effective S in the hummock environment were higher.(2) The content of exchangeable Ca2+, exchangeable Mg2+ and effective S in soils had obvious vertical distribution characteristics, which were almost all decreased with soils depth in different sampling points. The content of effective S in soils had no obvious vertical distribution characteristics. For different terrain conditions, the content of exchangeable Ca2+ were decreased with soils depth, The content of exchangeable Mg and effective S were highest in 0-20 cm depth, in 20-40 cm and 40-60 cm depth were closed.(3) The content of nutrients in needles were associated with the latitude. For the mountainous environment, the content of Ca were increased with the lower elevation, the content of Mg were decreased with the lower elevation. The content of S in needles had no obvious distribution characteristics. For the hummock environment, the content of Ca and Mg in 1-year-old needles were decreased with the lower elevation, the content of Ca in 2-year-old needles were increased with the lower elevation, the content of Mg in 2-year-old needles were decreased with the lower elevation. For falt ground environment, the content of Mg and S in 1-year-old and 2-year-old needles were decreased with the lower elevation, the content of Ca in needles had no obvious distribution characteristics. For different terrain conditions, no matter what 1-year-old or 2-year-old needles, the content of Ca and S in the mountainous environment were higher, the content of Mg in the hummock environment were higher. The content of Ca, Mg and S in 2-year-old needles were higher than 1-year-old needles.(4) No matter what the terrain conditions, the variability of Ca, Mg and S in needles and exchangeable Ca2+, exchangeable Mg2+ and effective S in soils presented medium variability, the coefficient of variation were greater. For different terrain conditions, the level variability of exchangeable Ca2+, exchangeable Mg2+ and effective S in soils almost all presented weak variability, the coefficient of variation were smaller. The vertical variability of exchangeable Ca2+, exchangeable Mg2+ and effective S in soils presented medium variability, the coefficient of variation were greater. The variability of Ca, Mg and S in needles presented medium variability, but the coefficient of variation were smaller.(5) Content of Ca in needles and exchangeable Ca2+ in soils were no significant correlation. Content of Mg in needles and exchangeable Mg2+ in soils were being related. S content in needles and effective S in soils were no significant correlation. Content of Ca in needles with slope position assumes the remarkable inverse correlation, with slope were being related. Content of Mg in needles with latitude were remarkable, with elevation assumes the remarkable inverse correlation. Content of S in needles with slope position assumes the remarkable inverse correlation.