黑河源流区旱柳根系分布特征研究  

The Study of Salix matsudana Root Distribution Features in Heihe Origins Area

作　　者：蔡海珍 

机构地区：[1]甘肃省水土保持科学研究所,甘肃兰州730020

出　　处：《安徽农业科学》2012年第33期16299-16301,共3页Journal of Anhui Agricultural Sciences

基　　金：甘肃省科技支撑计划项目(1104FKCA146)

摘　　要：在位于黑河源流区的肃南裕固族自治县境内选择旱柳利用根钻1/4样圆法取样,采用根系密度分析项目区旱柳根系的空间分布。结果表明,0～200 cm垂直剖面上,旱柳细根系(d≤2 mm)根系密度随土层深度的增加总体呈衰减趋势。0～60 cm土层细根根密度较大,在60～80 cm土层细根根系密度分布较为稳定。旱柳粗根根系密度在剖面随土层深度的增加呈"增-减-增-减"的趋势变化,40～80和120～180 cm土层为旱柳粗根根系密度分布的高密度区。距树干50、100、150、200 cm处,旱柳细根生物量占总根系生物量的比例分别为32.97%、27.01%、21.98%、18.05%,粗根生物量占总根系生物量的比例分别为51.35%、33.16%、6.96%、8.53%。垂直方向上,旱柳细根生物量均随土层深度的增加呈显著的负指数衰减。粗根生物量垂直分布基本相似,随着水平距离的增加,高密度区所占比重依次减小。水平方向上,旱柳根系生物量随距树干距离的增加而减小。Using root diamond-like 1/4 round method to select Salix matsudana samples in Heihe origin Sunan Yugu Nationality Autonomous County,the roots spatial distribution in project area was analyzed with roots density.The results showed that on 0-200 cm vertical profile,Salix matsudana fine roots（d ≤ 2 mm） root density showed decreasing trend with soil depth increases.Salix matsudana fine root density distribution in 60-80 cm layer was stable.The Salix matsudana roots,root density profile changes with soil depth indicated ＂increase-decrease-increase-decrease trends,40-80 cm and 120-180 cm soil Salix matsudana root density distribution was high-density area.From the trunk 50,100,150,200 cm,Salix matsudana fine root biomass of the total fine root biomass ratio was 32.97%,27.01%,21.98%,18.05%,Salix matsudana root biomass proportion of the total root biomass were 51.35%,33.16%,6.96%,8.53%.The vertical direction,Salix matsudana fine root biomass with increasing soil depth showed a significant negative exponential decay.Coarse root biomass vertical distribution is similar,with the increase of the horizontal distance,high-density areas the proportion is reduced in turn.The horizontal direction,Salix matsudana root biomass decreased with increasing distance from the stem.

关 键 词：黑河源流区 旱柳 根系分布 生物量 

分 类 号：S273.2[农业科学—农业水土工程]