Leaf Construction Cost and Related Ecophysiological Parameters of Rice Crop and Its Important Weeds

作     者：Vartika SINGH Hema SINGH 

作者机构：Ecosystems Analysis LaboratoryDepartment of BotanyBanaras Hindu University 

出 版 物：《Rice science》 (水稻科学（英文版）)

年 卷 期：2012年第19卷第3期

页      面：233-240页

学科分类：0710[理学-生物学] 0831[工学-生物医学工程（可授工学、理学、医学学位）] 09[农学] 0901[农学-作物学] 0836[工学-生物工程] 0902[农学-园艺学] 

主　　题：Caesulia axillaris Echinochloa cruss-galli leaf construction cost photosynthetic rate rice 

摘      要：To understand the reason for the success of weeds,we investigated the energetic cost of leaf construction,and certain ecophysiological traits of rice and its dominant *** physiological basis among all weeds,Caesulia axillaris Roxburgh was found to be the most serious,followed by Echinochloa cruss-galli *** and Echinochloa colonum ***,while Fimbristylis miliaceae *** and Cyperus iria *** moderate weeds of the rice *** had the lowest leaf construction cost （LCC） both on a mass basis （1.15 g/g） and on a unit area basis （22.93 g/m2）.Comparatively higher specific leaf area,photosynthetic rate,photosynthetic nitrogen use efficiency,leaf area ratio and leaf area index provided *** with further competitive *** LCC suggests that weeds utilize carbon resource more efficiently than the crop and potentially spend the saved energy on other competitive strategies *** production,biomass production and high relative growth rate,which results in low crop yield and increase in weed seed bank.