The Study Of Soil Chemical Properties And Biomass' Spatial Heterogeneity In Daqing

The study on the salt alkali land in Daqing area about soil profile (0-80cm) and 3 differenthorizontal soil (0-10cm,10-40cm,40-80cm) of total salt,pH value,alkalinity,exchange Na,organic matter,cation exchange capacity(CEC) and biomass above the land, itis proved that:1 on the vertical soil profile, soil pH value and exchange Na go up first and then fall off,the pH value is the highest in the 40cm soil under the ground, and exchange Na is the highestin the 40-60cm soil, total salt and alkalinity go up with the depth of soil, but variations are notdistinct, organic matter and CEC are lowest in the 40-80cm soil, and fall off with the depth ofsoil distinctly; the coefficient of variation of organic matter is the highest(116ï¼…), and thenexchange Na, alkalinity and total salt are lower(71ï¼…,65ï¼…,42ï¼…), CEC and pH value are thelowest(13ï¼…); the autocorrelation range of pH value,total salt,alkalinity and exchange Naare similar, 12.00m,12.00m,11.12m,10.67m, it is because the salt goes up forced by water;but the autocorrelation range of CEC and organic matter are lower, 1.44m and 0.41 m, becauseof the soluble salt; fitting the logarithm function of pH value,exchange Na,total salt,alkalinity,organic matter and CEC, the result is significance level, it proves that the soilchemical properties have good typing character, fractal dimension is higher, the spatial patternis more complex, C/C₀+C of pH value, total salt, alkalinity and exchange Na are higher than75ï¼…, it means that space autocorrelations are stronger, C₀/C₀+C of CEC and organic matter arelower than 75ï¼…but higher than 25ï¼…, it means that space autocorrelations are middle.2 the soil chemical properties are much different in 0-10cm,10-40cm,40-80cm soil inExperimental land, the heterogeneity exists, every soil chemical property changes a lot, fromthe coefficient of variation, exchange Na of three soil is the highest(115ï¼…-270ï¼…), and then thesoil alkalinity(72ï¼…-130ï¼…), the coefficients of variation fall down with the soil depth deeper,the soil organic matter's coefficient of variation is about 45ï¼…in three layers of soil, thecoefficient of variation of total salt in the bottom layer(40-80cm) is the lowest(33ï¼…), themiddle layer's coefficient of variation is 46ï¼…, and the top layer' coefficient of variation is thehighest(66ï¼…), the coefficient of variation of pH value is the lowest, the top's and the middle'scoefficient of variation is 10ï¼…, and the bottom one is 6.4ï¼…, the autocorrelation range ofbiomass is 5.71 m, it is similar with the one of soil alkalinity and soil total salt of 10-40cm soil,and it is also similar with exchange Na,pH value total salt and soil alkalinity of 10-40cm soil,and it is the same with 40-80cm soil; C/C₀+C of biomass is 92.0ï¼…, and the other soil chemicalproperties' C/C₀+C are more than 80.0ï¼…, such as pH value,soil total salt and soil alkalinity, their C/C₀+C is more than 75.0ï¼…, it means that space autocorrelations are stronger.