Spatial-Temporal Variation Analysis of Soil Bulk Density and Organic Matter of Plowlands in Guilin
ThroughmakingacomprehensiveanalysistothedataofsoilbulkdensityandorganicmatterofplowlandsinGuilincity,thispaper expounds spatial-tem poral variation of soil bulk density and organic m atter of plow lands during 1980~2010 years. T he results show ed that soilbulk density offoursoilparentm aterialsexhibited an increasing trend afterthe firstlow er;w hile soilorganic m attercontentoffluvialand alluvialsoilparentm aterialsshow ed an upw ard trend,soilorganic m attercontentofsandstone and shale parentm aterialshow ed a dow nw ard trend afterthe firstrise,soilorganic m attercontentoflim estone parentm aterialshow ed a dow nw ard trend.O verall,the soilbulk density about the m ajority of 29 points w as at inappropriate level, and organic m atter content about m ost of points w as at above the m iddle level;the percentage ofsoilbulk density atinappropriate grade in 1980,1995 and 2010 w as 69.0% ,34.5% and 34.5% respectively,soilorganic m atter content at m edium grade in 1980, 1995 and 2010 w as 44.8% , 34.5% and 27.6% , respectively. In view of these problem s,the paper gives som e corresponding m easures to raise bulk density and organic m atter of plow lands.
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