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草业学报  2015 

紫色土区3种草本植物根系特征及改土培肥效应

DOI: 10.11686/cyxb2014456, PP. 99-107

Keywords: 水土保持,根重密度,根长密度,根表面积密度,土壤养分

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Abstract:

为探讨紫色土区草本植物根系的改土培肥效应,选取已种植3年(2011-2013年)的水土保持常用草类紫花苜蓿、狗牙根和香根草为目标物种,分0~10cm,10~20cm,20~30cm土层采集根系和土壤样品,WinRHIZO(Pro.2004c)根系分析系统测定根系指标,常规方法测定土壤理化性质。结果表明:所有土层,香根草的各项根系指标均较优,尤其是根长密度和根表面积密度(最大均值分别为13.46cm/cm3和5.75cm2/cm3),紫花苜蓿则总体上的根重密度最好(最小均值为18.10mg/cm3);定植3年,这3种草本植物并未对试验区紫色土的机械组成产生显著影响,但在数值上草本区有粗颗粒减少、细颗粒增多的趋势;多数草本植物对多个土层的土壤有机质和速效钾产生显著影响(有机质增加,速效钾亏损),而对土壤全氮、碱解氮、总磷、有效磷和全钾的影响却很微弱;所有草本区的全钾含量较高3.93~4.83g/kg,却在几乎所有土层出现速效钾的亏损,尤其是紫花苜蓿区最大亏损量达20.24mg/kg;相关分析中,所有土壤养分与全部或部分根系指标呈现显著或极显著相关(最大相关系数为0.833)。

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