草地学报

›› 2009, Vol. 17 ›› Issue (1): 79-83,87.DOI: 10.11733/j.issn.1007-0435.2009.01.016

• 研究论文 • 上一篇    下一篇

刈割频度对四翅滨藜生物量累积及根系垂直分布的影响

何芳兰1, 裴明祥2, 王继和1, 刘虎俊1, 尉秋实 8768 1   

  1. 1. 甘肃省治沙研究所荒漠化重点实验室, 甘肃, 武威, 733000;
    2. 武威广厦铁路房建生活有限公司, 甘肃, 武威, 733000
  • 收稿日期:2008-05-07 修回日期:2008-09-26 出版日期:2009-02-15 发布日期:2009-02-15
  • 通讯作者: 裴明祥,Author for correspondence,E-mail:peimingxiang@126.com
  • 作者简介:何芳兰(1980- ),女,甘肃陇西人,硕士,研究方向为沙旱生植物种质资源保存与利用,E-mail:hefanglan2003@126.com
  • 基金资助:
    国家“948”项目(2005-04-C05)

Effect of Different Cutting Frequencies on Biomass Accumulation and Root Vertical Distribution of Atriplex canescens(Pursh) Nutt.

HE Fang-lan1, PEI Ming-xiang2, WANG Ji-he1, LIU Hu-jun1, YU Qiu-shi1   

  1. 1. Gansu Key Laboratory of Desertification Combating & Gansu Desert Control Research Institute, Wuwei, Gansu Province 73300, China;
    2. Wuwei Huge-mansion Railroad living-building Co., Ltd., Wuwei, Gansu Province 73300, China
  • Received:2008-05-07 Revised:2008-09-26 Online:2009-02-15 Published:2009-02-15

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摘要： 为科学指导四翅滨藜(Atriplex canescens(Pursh)Nutt.)在我国西北沙区的生产和利用,研究不同刈割处理下四翅滨藜生物量变化及其根系垂直分布。结果表明:刈割频度对四翅滨藜的地上、地下部分生物量积累均有极显著影响(P<0.01),地上生物量随刈割频度增大而先增大后减小,2次刈割生物量最大,单株均值高达14.26g;粗脂肪、粗蛋白、粗灰粉及无氮浸出物百分比随着刈割频度的增大而增大,而粗纤维则逐渐减小;当刈割次数逐渐增加时,主根直径、根系体积、根系生物量及粗根百分比均显著减小(P<0.05),根系在土壤深层(40~70cm)中的分布也减少,而在浅土层中(0~20cm)的分布明显增大;4组刈割处理的根系垂直分布特征参数β的值均小于对照(H0),并随刈割频度增大其值逐渐减小。

关键词: 四翅滨藜, 刈割频度, 生物量, 垂直分布

Abstract: The Biomass and root vertical distribution of Atriplex canescens(Pursh) Nutt.under different cutting frequencies were studied in the field.The results show that cutting frequency had significant effects on the aboveground and underground biomass allocation and root vertical distribution of A.canescens(P<0.01).Firstly,with the increasing of cutting frequency,the aboveground biomass increased at the beginning and then decreased with highest accumulated biomass of 14.26 g plant-1 under two cutting times and the contents of crude protein,crude fat,ash,and N-free extract were always increased,but the crude fibre decreased gradually.Secondly,as the cutting frequencies increased,the taproot diameter,root system volume,root system biomass,and rude root percentage were decreased significantly(P<0.05),the root distribution in soil layer of 40 to 70 cm was reduced,and that in shallow soil layer of 0 to 20 cm increased significantly.The characteristic parameters(H0) of root vertical distribution under all cutting treatments were smaller than that of the control and decreased gradually along with the increasing of cutting frequency.

Key words: Atriplex canescens(Pursh) Nutt., Cutting frequencies, Biomass, Root vertical distribution

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