柳枝稷苗期对钾营养胁迫耐受性的综合评价

为明确能源作物柳枝稷在缺钾条件下的耐受能力，筛选出耐贫瘠性强的优质种质资源，以13个柳枝稷品种为供试材料，在人工气候室中开展水培试验，通过相关农艺性状和生理指标等评价指标的测定，采用标准差系数赋予权重法对柳枝稷在缺钾胁迫下的表现做出综合评价。结果表明：在缺钾胁迫下，13个柳枝稷品种地上及地下部的生长均受到显著抑制，具体表现为：生长速度下降，叶绿素含量减少，光合面积减少，光合速率降低，进而导致其总生物量积累下降。由标准差系数赋予权重法得出的13个品种耐胁迫性由高到低依次为：Cave—In—Rock、Trailblazer、BJ-5、Forestburg、BJ-4、Pathfinder、BJ～3、BJ一2、Blackwell、Alamo、BJ-1、BJ-6、Kanlowo

Comprehensive Evaluation of Potassium-deficiency Stress of Switchgrass at Seedling Stage

To illustrate the effects of potassium-deficiency stress on biomass, agronomic traits and physiological indexes of switchgrass, a sort of bioenergy crop, and to obtain the cuhivar with best tolerance, 13 switchgrasses were treated under potassium-deficiency in hydroponic ar- tificial climatic chamber. The comprehensive evaluation was made through the analysis of evaluation indexes using standard deviation coeffi- cient allocation weighed method. The results indicated that： the potassium-deficiency stress had exerted significantly inhibitory effects on the aboveground and belowground growth of switchgrass, including the reduction of growth rate, decrease of chlorophyll content, reduction of ef- fective photosynthetic area, decrease of photosynthetic rate, which led to the lower biomass production. The tolerance of 13 switchgrasses from strong to weak was as follows： Cave-ln-Rock, Trailblazer, B J-5, Forestburg, B J-d, Pathfinder, B J-3, BJ-2, Blackwell, Alamo, B J-l, B J-6 and Kanlow.