草业科学Issue(10)：99-107,9.DOI:10.11686/cyxb2014456
紫色土区3种草本植物根系特征及改土培肥效应
Root system distribution characteristics of three herbs and their effects on soil compo-sition and nutrients in the ‘Purple Soil’region
摘要
Abstract
In order to explore the effects of herb roots on soil physical properties and soil nutrients,alfalfa (Medicago sativa ),Bermuda grass (Cynodon dactylon )and vetiver grass (Vetiveria zizanioides ),planted for three years,were used for these experiments.Taking bare plots as a contrast,soil and root samples from 0-10 cm,10-20 cm and 20-30 cm soil layers were collected.Then the WinRHIZO (Pro.2004c)root analy-sis system was used to measure root parameters and conventional methods were used to measure soil physical and chemical properties.In all three soil layers,vetiver grass root parameters were excellent,especially root length density and root surface area density,for these two traits the maxima averaged 13.46 cm/cm3 and 5.75 cm2/cm3 ,respectively.Overall,root weight density (RWD)of alfalfa was the greatest,with a minimum aver-age of 18.10 mg/cm3 .None of the three herbs had any significant effects on soil physical properties 3 years af-ter planting,but data for the herb plots showed that the proportion of sand particles had decreased and the pro-portion of finer particles (silt and clay)had increased,compared to bare CK plots.Most herbs had significant effects on soil organic matter and available potassium in most soil layers,with content of organic matter in-creasing and content of available potassium decreasing.However,the herbs had almost no effect on soil total nitrogen,alkali-hydrolyzable nitrogen,total phosphorous,available phosphorous and total potassium.The to-tal potassium contents of all herb plots (3.93-4.83 g/kg)were higher than the bare plots,but the available potassium levels of all herb plots were low,especially in alfalfa.The maximum deficient number was 20.24 mg/kg.All soil nutrients had significant correlations (P <0.05)with all or some of the root parameters,and the maximum correlation coefficient was 0.833,for the relationship between organic matter and RWD.关键词
水土保持/根重密度/根长密度/根表面积密度/土壤养分Key words
soil and water conservation/RWD (root weight density)/RLD (root length density)/RAD (root surface area density)/soil nutrient引用本文复制引用
谌芸,何丙辉,练彩霞,刘志鹏..紫色土区3种草本植物根系特征及改土培肥效应[J].草业科学,2015,(10):99-107,9.基金项目
国家自然科学基金（41271291，41501288），国家科技支撑计划项目（2011BAD31B03），中央高校基本科研业务费专项（SWU113013， XDJK2014C103，XDJK2015C170）和西南大学教育教学改革研究项目（2013JY052）资助。 （）
