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Loess Plateau temporal variation regularity of soil organic matter

Author: WangBaoLiang
Tutor: PanXianZhang；GuanQingWei
School: Nanjing Forestry University
Course: Ecology
Keywords: Loess Plateau Soil organic matter Spatial Variability Changwu Soil - landscape model
CLC: S158
Type: Master's thesis
Year: 2009
Downloads: 190
Quote: 4
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Abstract


Based on GIS technology , statistical methods and soil - landscape model to study the Loess Plateau Changwu spatial distribution of organic matter and from 1983 to 2008 25 years topsoil organic matter Variation with time . The statistical results showed that soil organic matter content Changwu was 13.44 ± 3.07 g · kg-1, coefficient of variation was 25.41% . From the soil - landscape model analysis results, based on topography , geomorphology and land use types are divided into landscape units and soil organic matter content generally has a better correlation ; organic matter content of soil and terrain exists between variables significantly associated sex . Under different land use patterns of surface soil organic matter content of the order are: woodland gt; grass gt; garden gt; arable land , the coefficient of variation in the order of woodland gt; grass gt; garden gt; land ; different topography of the soil organic matter content of the order of : Slope in gt; plateau surface gt; ditch slope portion gt; plateau edge gt; Goudi , coefficient of variation order: middle slope gt; Goudi gt; ditch slope portion gt; plateau edge gt; plateau surface ; different soil types soil organic matter content in the order: black loam gt; loess soil gt; laterite gt; river silt , coefficient of variation order: river silt gt; loess soil gt; laterite gt; black loam . From the semi- variogram can be seen, the spatial distribution of soil organic matter in 1983, as a weak spatial correlation , 2008 spatial distribution of soil organic matter is moderate spatial correlation , it is because the distribution of soil organic matter is determined by structural factors and random the result of factors . 1983 to 2008 , increasing soil organic matter content , content from a mean of 9.90g · kg-1 increased 13.44g · kg-1. Increase the amount of fertilizer , tillage changes in land use such as the conversion of arable land to the orchard , and the national forest and grassland vegetation in gully policies on the protection of soil organic matter is caused by the accumulation of the main reasons.

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil fertility (soil fertility )
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