摘要
盆栽试验条件下,以辽豆18为材料,分别在V2～R1,R1～R5,R5～R7期设置3个控水处理,控水结束后取样测定根系性状,成熟后测定产量。结果表明:干旱影响大豆产量的形成,干旱(W1)胁迫引起产量下降的程度要高于轻度干旱(W2)。不同时期干旱(W1)引起产量下降程度为:鼓粒期>花荚期>营养生长期。干旱胁迫(W1)主要通过降低大豆的单株荚数从而降低单株产量。大豆的根长比例和根表面积比例主要为根系直径为0～1.0 mm的细根,分别约占总根长的90%和总根表面积的60%。大豆根体积的分配比例主要是根系直径大于4.5 mm的粗根,其根体积所占比例在48%以上。R1～R5和R5～R7控水大豆细根(根系直径为0～1.0 mm)的根长和根表面积分配比例较V2～R1控水时增加。干旱降低了植株中直径大于4.5 mm粗根的根长比例、根表面积比例和根体积比例。随着生育进程的推进,根生物量密度逐渐增加,土壤干旱胁迫降低了根生物量密度。
In order to investigate the effects of drought stress on yield and root characteristics in soybean, pot-experiments were carried out in Shenyang, Liaodoul8 was chosen as the tested variety, and 3 water supply levels were included in terms of soil water content controlled at vegetative stage（ V2-R1 ）, flowering and podding stage （R1-R5）and pod filling stage （RS-R7）, re- spectively. The negative effect of soil drought（ W1 ）at different stages on soybean yield showed in the order： RS-R7 〉 R1-R5 〉 V2-R1. Drought stress（ W1 ）decreased soybean yield mainly through reducing pod number per plant, and mild drought （W2） caused lower yield decreasing than drought （ W1 ）. Both root length ratio and root surface area ratio were primarily fine root （ root diameter, d = 0-1.0 ram）, accounting for 90% and 60%, respectively. Soybean root volume ratio was mainly thick root （ d 〉4.5mm） ,accounting for more than 48% of total root volume. When water controlled at R1-R5 and RS-R7, the length and surface area allocation ratio of fine root（ d =0-1. 0 mm）exceeded that of V2-R1. Soil drought reduced root length,root surface area and root volume allocation proportion of thick root（ d 〉4.5 mm）. The root biomass density increased with the advance of growthprocess,while drought stress reduced root biomass density.
出处
《大豆科学》
CAS
CSCD
北大核心
2013年第1期59-62,67,共5页
Soybean Science
基金
辽宁省科技攻关项目(2011201020)
关键词
干旱
产量
根系特性
大豆
Drought
Yield
Root characteristics
Soybean
