摘要
试验研究不同土壤水分冬小麦根、冠关系及其对叶片水分利用效率的影响结果表明,水分条件对根系与叶冠间干物质分配模式影响较小,而对根系功能与叶冠结构建成之间关系影响较大,水分胁迫抑制植株结构的建成,随作物由营养生长向生殖生长的过渡其根系功能发挥与叶冠结构建成之间矛盾愈加明显,拔节期复水有利于植株根系功能的增强和叶冠结构的改善。根冠比与叶片水分利用效率关系呈单峰倒“V”型曲线,水分多少可影响曲线的斜率和高低。根量达最大值前沿根冠比降低的方向,叶片水分利用效率增加;当根量达最大值时叶片水分利用效率也达最大值,此时根冠比为0 .1～0 .2。而抽穗期后沿根冠比降低的方向,其叶片水分利用效率也降低。
Relationships between root and shoot of winter wheat under different soil water conditions and their effects on the water use efficiency of leaf( WUE L )were studied.The results indicate that the effect of soil moisture on the dry matter allocation pattern between root and shoot is little,but is great on the relationship between root function and shoot structure forming.Water stress inhibits the structure forming of plant,with the crop growing from vegetive period to reproductive period,the inconsistency between root function exerting and shoot structure forming is more and more distinct.Rewatering during the jointing stage is favorable to strengthen the function of root and improve the structure of shoot.The correlation curve between ratios of root and shoot( R/S )and WUE L is a single peak of inverse “V”figure,and water content can influence the slope and intercept of the curve. WUE L increases with the decreasing of R/S before the root biomass reaches its maximal value; WUE L arrives at the peak value when the root biomass reaches its maximal value,while the R/S is between 0.1 and 0.2. WUE L reduces with the minishing of R/S after the heading stage.
出处
《中国生态农业学报》
CAS
CSCD
2005年第2期134-137,共4页
Chinese Journal of Eco-Agriculture
基金
国家重点基础研究 (973 )发展规划项目 (G19990 1170 9)
国家自然科学基金项目 (4 99710 42 )资助
关键词
叶片水分
根冠比
利用效率
冬小麦
土壤水分
根系
根量
影响
增加
建成
Soil water,Winter wheat,Relationship between root and shoot,Water use efficiency of leaf(Received Jan.7,2004
revised Feb.24,2004)
