摘要
光照充足，而且照射时间长，是南疆棉区气候生态条件的一个重要特点。棉花光合速率较高，光合时间较长，光合产物形成与积累较多，可能是其高产的主要生理原因。棉花群体内部透光性有很大的差别，叶面积增形分布较伞形分布合理。通过棉田涓光系数的测定，在高密度栽培条件下，叶面积仍以3．0－3．5为宜。能否将叶面积系数3．5（封行期）作为南疆高产棉田群体高限的参考指标，尚须进一步研究。
Plentiful and long- time sunshine, the most important characteristics of cli-matic ecology in the south of Xinjiang, may be the main physicological causes of high yield,which result in higher photosynthetic rate, longer photosynthetic time and more photosy-thetic productive formation & accumalation. There lies a great difference in the perviousnes tolight among the inside of cotton colony. and the tower^shaped distribution of leaf area islnore proper than the unbrella-shaped one' Through the determination about extinction co-efficient in cotton field,the leaf area is proper at 3. 0-3. 5 under the high densely cultivatedcondition. It is still needed further study about whether leaf index 3. 5 (in the period of seal-ing up lines) can be used as maximum reference target of high yield cotton field colony in thesouth of Xinjiang.
出处
《塔里木农垦大学学报》
1997年第1期5-9,共5页
Journal of Tarim University of Agricultural Reclamation
基金
国家重点科技项目
关键词
棉花
光合速率
群体结构
消光系数
Cotton, Photosynthetic rate, Colony structure, Extinction coefficient,Leaf area index
