种植方式对苜蓿人工草地土壤微生物量碳、氮影响

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1、摘要2011~2012年在内蒙古呼和浩特市和林格尔县西沟门实验基地，以草原3号杂花苜蓿（MedicagovariaMartin.cv.CaoyuanNo.3）和锡林郭勒缘毛雀麦（BromusciliatusL.cv.Xilinguole）为材料、休闲地为对照，建立单播、间行混播及同行混播人工草地，对其土壤微生物量碳、氮含量及牧草生物量进行了研究，结果如下：（1）不同种植方式明显影响土壤微生物量碳、氮含量，其中草原3号杂花苜蓿与缘毛雀麦混播地土壤微生物量碳、氮含量显著高于单播和休闲地；随着土层的加深，不同种植方式土壤微生物量碳、氮含量逐渐减少。（2）不同种植方式影

2、响草原3号杂花苜蓿地上生物量，混播时地上生物量显著高于单播，而缘毛雀麦单播时较混播高，草原3号杂花苜蓿与缘毛雀麦地下生物量变化趋势与地上生物量相似；土壤微生物量碳、氮与牧草地下生物量、总生物量呈正相关，与牧草地上生物量呈负相关。（3）在混播方式中，草原3号杂花苜蓿CRa值大于1，其竞争力大于缘毛雀麦。关键词：微生物量碳；微生物量氮；种植方式EffectofPlantingPatternsonSoilMicrobialBiomassCarbonandNitrogenofMedicagoArtificialGrasslandAbstractThispaperisst

3、udiedtheeffectofdifferentplantingwaysonsoilmicrobialbiomasscarbonandnitrogenofMedicagoartificialgrasslandandforagebiomassinthispaper,intheXigomenexperimentalbase,HohhotHelingeerCounty,in2011~2012year.Thedifferentplantingwaysare:singlesowingMedicagovariaMartin.cv.CaoyuanNo.3,singlesow

4、ingBromusciliatusL.,thebetweenlinesmixedsowingandthecounterpartsmixedsowingMedicagovariaMartin.cv.CaoyuanNo.3andBromusciliatusL.,atthesametimeinfollowlandtreatmentforcomparison,theresultsshownthat:(1)Differentplantingpatternssignificantlyaffectsthesoilmicrobialbiomasscarbonandnitroge

5、ncontent,soilmicrobialbiomasscarbonandnitrogencontentofmixedsowingMedicagovariaMartin.cv.CaoyuanNo.3andBromusciliatusL.treatmentarehigherthanthesinglesowingtreatmentandfollowlandtreatment(P<0.05).(2)Differentplantingpatternsaffectsthedistributionofthesoilmicrobialbiomasscarbonandnitr

6、ogen,withsoildepths,soilmicrobialbiomasscarbonandnitrogencontentdecreased,0~10cmsoilmicrobialbiomasscontentvariationisconsistentwiththe10~20cmvariation.(3)DifferentplantingpatternsaffectsabovegroundbiomassofMedicagovariaMartin.cv.CaoyuanNo.3,abovegroundbiomassunderthemixedsowingtreat

7、mentsaresignificantlyhigherthanthesinglesowingtreatments(P<0.05),andabovegroundbiomassofBromusciliatusL.underthemixedsowingtreatmentsarelowerthanthesingletreatments,thisindicatemixedsowinghavenosignificantimpactonabovegroundbiomassofBromusciliatusL.;undergroundbiomasschangingtrendsof

8、Medicagovari