玉米根系分泌碳、氮动态及与根系特征的关系  

Dynamics of Carbon and Nitrogen in Root Exudation and Their Relations with Root Traits in Maize

作　　者：万一兵 唐岚岚 展茗[1] 尚春辉 袁嘉仪 秦明广 Wan Yibing;Tang Lanlan;Zhan Ming;Shang Chunhui;Yuan Jiayi;Qin Mingguang(MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River,College of Plant Science and Technology,Huazhong Agricultural University,Wuhan 430070)

机构地区：[1]华中农业大学植物科学技术学院/农业农村部长江中游作物生理生态与耕作重点实验室,武汉430070

出　　处：《中国农学通报》2021年第24期31-38,共8页Chinese Agricultural Science Bulletin

基　　金：国家自然科学基金项目“旱作类型及秸杆还田对水旱轮作土壤碳氮耦合循环及氮素利用的影响机制”(31871579);国家自然科学基金项目“玉-稻复种替代双季稻后根-土过程变化对土壤有机碳与碳排放的影响”(31571622)。

摘　　要：为深入认识玉米根系分泌碳、氮规律及其与根系特征的关系,以玉米品种‘迪卡653’为材料,采用土培-水培相结合的方法,测定了玉米根系形态指标和根系分泌物中碳、氮的含量。结果表明,玉米根系碳、氮分泌比强度(EIroot-C、EIroot-N)在生育前期高于生育后期,与比根长、比根表面积、比根体积呈显著正线性相关,而与根系C/N比呈显著负线性相关;玉米单株碳、氮分泌强度(EIplant-C、EIplant-N)在生育期内呈先升高后降低的趋势,累积分泌碳15.71 g/plant,累积分泌氮0.75 g/plant;EIplant-C与根长、根表面积、根体积、根干重、根冠比、叶面积之间均存在极显著二次曲线关系,而EIplant-N仅与根冠比之间有显著二次曲线关系。依据玉米根系特征与根系分泌碳、氮的定量关系,可为估算大田种植下玉米根系分泌碳、氮量提供参考。The aims are to study the law about root exuding carbon and nitrogen in maize and their relationships with root traits.The maize variety‘Dika 653’was used as material,the method of soilhydroponic-hybrid was used to determine the morphological indicators of root,carbon and nitrogen contents in root exudation.The results showed that the specific root carbon and nitrogen exudation(EIroot-C,EIroot-N)were higher at the early growth stage than those at the late growth stage.EIroot-C and EIroot-N had a significantly positive linear correlation with specific root length,specific root surface area and specific root volume,but had a significantly negative linear correlation with C/N ratio in root.The carbon exudation per plant(EIplant-C)and nitrogen exudation per plant(EIplant-N)increased first and then decreased during the growth period.The accmulated root carbon and nitrogen exdation reached 15.71 g/plant and 0.75 g/plant during the maize plant growth period,respectively.There was a significant quadratic relationship between EIplant-C and root length,root surface area,root volume,root dry weight,root shoot ratio and leaf area,while EIplant-N only had a significant quadratic curve relationship with root shoot ratio.The carbon and nitrogien in root exudations in maize field could be estimated accroding to the relationship between root traits and root exuding carbon and nitrogien.

关 键 词：玉米 根系分泌 碳 氮 根系特征 

分 类 号：S513[农业科学—作物学] S31