干旱荒漠区土壤有机质空间变异特征

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1、万方数据第24卷第12期生态学报V01．24，No．122004年12月ACTAECOLOGICASINICADec．，2004干旱荒漠区土壤有机质空间变异特征(1黄元仿1，周志宇孙，苑小勇1，张红艳1中国农业大学，北京100094；2．兰州大学草地农业科技学院，甘肃730020)摘要：以内蒙古阿拉善左旗为例，研究了干旱荒漠区土壤有机质的空间变异特征。传统统计分析结果表明，研究区内土壤有机质含量总体水平较低，平均为6．659／kg；变异系数为1．42，属强变异。在半方差结构分析和球状模型套合的基础上，结合普通

2、K“ging插值方法，分析了土壤有机质的地统计特征。比较不同趋势效应和异向性的普通Kriging插值的误差结果表明，宜考虑各向异性和二阶趋势效应。获得了研究区土壤有机质含量的等值线图，并分析了其空间分布规律。关键词：干旱荒漠区；土壤有机质；空间变异；趋势效应SpatialVariabilityOfsoilorganicmattercontentinanariddesertareaHUANGYuan—Fan91，ZHOUZhi—Yu2，YUANXiao—Yon91，ZHANGHong—Yanl(1．∞imAg—

3、f“zf“mzUni口Prs妇，BP衲glo0094，C^inn；2：厶以z^。“【，ni材椰幼，G彻s“730020，c^in口)．Acf口＆DfDgf伽Sf—f∞，2004，24(12)：2776～2781．Abstract：AlxaLeftBannerinthewestoftheInnerMongoliaAutonomousRegion，China，isatypicalariddesertareainthemiddletemperatezonebetweenthenorthernborderofChin

4、aandtheeasternAlxaPlateau．Duetoovergrazingandhumanactivities，soildegradation(ordesertification)intheareaisbecomingincreasin91yseVereduetolossofsoilorganicmatter(SOM)．LowSOMcontentimpactssoilqualitydirectlyinthisariddesertarea．Understandingthespatialvariatio

5、nanddistributionpatternofSOMcontentisneededforsustainabledeveIopmentintheregion．Inthisstudy，thespatialVariationofSOMcontentinA1xaLeftBannerwasdeterminedusingbothtraditionalstatisticsandgeostatisticstoproVideinformationforunderstandingdesertificationmechanis

6、msandpreventingso订degradation．Basedonlocallandforms，103soilsamples(O～20cm)werecollectedfromtheareawithintheHelanMountainwatershed，onthewesternborderoftheWulanbuheDesert，thenorthernborderoftheTenggeliDesertandthesouthernborderoftheGobiregion．TheSOMcontentwas

7、analyzedusingtheWalkley—Blackwetcombustionmethod．Thegeostatisticalcharacteristics，spatialtrendandazimuthofanisotropicaxleofSOMcontentwereanalyzedusingtheGeostatisticalAnalyst，ArcGIS8．1．WecreatedacontourmapofSOMcontentforthestudyareausingKriginginterp01ation

8、．Traditionalstatisticalanalysis(descriptivestatistics)showeddifferencesinSoMcontentamongdifferentsoiltypes．Thecoefficientofvariation(CV)ofSOMcontentwasgreatestinAeoliansandysoil(CV1．10)andsmallestinSub