扁穗牛鞭草对土壤理化性质的影响研究

通过测定在2年内不施肥条件下扁穗牛鞭草栽种地土壤理化性质指标,研究与探讨了栽植扁穗牛鞭草对土壤理化性质的影响。结果表明,1)表层土壤理化性质随栽植时间增加产生不同程度的变化,其中物理性质方面:容重增加,最大变化幅度为17.44%,总孔隙度降低,变化幅度18.38%,毛管和非毛管孔隙度及土壤持水量变化不显著;化学性质方面:有机碳和全量养分差异不显著,速效养分变化达显著水平。2)底层土的理化性质随栽植时间增加差异不显著。经综合分析,随栽植时间的增加,土壤整体透气性能和供肥能力下降,土壤肥力降低。

Effects of planning Hemarthria compressa on physical and chemical properties of soil

The experiment was conducted in the southwest hill area of Sichuan to study the effects of planting Hemarthria compressa on physical and chemical properties of soil by observing the main soil property indicators.H.compressa was planted in October of 2003,and was cut 7 times(in April,June,August and October 2004 and April,June and August 2005) without any fertilization for two years.The physical and chemical properties of the upper-layer soil changed with time.Specifically,the soil bulk increased 17.44% and porosity decreased 18.38% whereas the capillary porosity,non-capillary porosity and the maximum water holding capacity showed only a little,non-significant change.The soil organic carbon and total nutrients showed no significant change,but available nutrients changed significantly.However,variations in the properties of the lower-layer soil were insignificant.Through a comprehensive analysis,it is concluded that with an increase of planting time and successive cutting without fertilization,the soil air permeability and fertility decreased.