摘要
细根对植物功能的发挥和土壤碳库及全球碳循环具有重要意义.采用容器法和微根管法于2013年6～10月整个生长季内对紫花苜蓿的细根生物量、生产以及周转规律进行研究.结果表明：（1）紫花苜蓿活细根现存生物量平均值以接种摩西球囊霉（Gm）处理最高（12.46 g·m-2）,未接种对照最低（7.31 g·m-2）,并且活细根现存量在9月中旬达到峰值;死细根现存生物量呈先增加后降低再增加的变化趋势,在整个生长过程中未接种处理高于接种处理,接种根内球囊霉（Gi）处理死细根现存平均生物量（3.11 g·m-2）又较接种组其他处理低.（2）苜蓿植株细根生长量以接种幼套球囊霉（Ge）处理最大（0.045 mm·cm-2·d-1）,接种Gm处理和未接种对照最低（均为0.027 mm·cm-2·d-1）;而未接菌植株细根死亡量（0.044 mm·cm-2·d-1）显著高于接种植株,接种组又以Gi处理最低（0.021 mm· cm-2·d-1）.（3）紫花苜蓿在生长季节内细根生产和死亡的高峰分别出现在8月底和10月份,低谷出现在9月底到10月中旬和6月底到8月;接种地表球囊霉（Gv）后细根现存量和年生长量显著高于对照和接种其他菌种处理,细根的周转以对照组最大,而接种Gv和Gm处理较低.研究发现,通过接种丛植菌根真菌可以提高苜蓿细根生物量,降低细根的死亡,增加细根寿命.
Fine roots played a significant role in exerting the plant functions, soil carbon pool and global car- bon recycling. We observed biomass, production and turnover of the fine roots of alfalfa by container meth- od and minirhizotron in the whole growing season that was ranged from June to October in 2013. The result showed that： （1）The inoculated Glomus mosseae （Gm） had the highest mean biomass （12.46 g· m-2） ,the control group had the lowest mean biomass （7.31 g · m 2）. The live fine root biomass peaked in mid Sep- tember,hut the dead showed a tendency of increasing first and then declining, and then increasing. In the whole growing process, the dead fine root biomass of non-inoculated was higher than that with inoculated treatment,and inoculated Glomus intraradices （Gi）showed the lowest biomass of dead fine root （3.11 g ·m-2）. （2）Inoculated Glomus etunicatum （Ge） had the highest fine root production （0. 045 mm · cm - 1· d-1） ,Gm and control group had the lowest （0. 027 mm· cm-2 · d-1 ）. However,fine root mortality of non- inoculated treatment （0. 044 mm · cm-2 · d-1） was significantly higher than that with inoculated treat- ments,and Gi had the lowest fine root mortality （0. 021 mm · cm-2 · d-1）. （3）Production and mortality peaks of fine roots appeared at the end of August and October,but trough came in at the end of September to mid October and the end of June to August during the growing reason. The average fine root length and annual length production of Glomus versiforme （Gv） was significantly higher than that of control and other inoculated treatments. Control treatment had the highest fine root turnover,Gv and Om were the lowest. Inoculating with arbuscular mycorrhizal fungi could improve fine root biomass, reduce mortality and in- crease the lifespan of alfalfa.
出处
《西北植物学报》
CAS
CSCD
北大核心
2014年第12期2535-2543,共9页
Acta Botanica Boreali-Occidentalia Sinica
基金
兵团博士资金专项(2012BB017)
国家牧草产业技术体系项目(CARS-35)
石河子大学高层次人才引进项目(RCZX201022)
石河子大学科技服务项目(4004103)
关键词
菌根真菌
苜蓿
生物量
细根
微根管
周转
arbuseular mycorrhizal fungi
alfalfa
biomass
fine root
minirhizotron
turnover
