利用氢氧稳定同位素探究保水剂对玉米根系作用机理  

Exploration on the Mechanism of Super Absorbent Polymer Effect on Maize Roots Using Stable Deuterium and Oxygen Isotopes

作　　者：朱元浩 杨培岭[1] 杜鑫[1] 廖人宽[1] 

机构地区：[1]中国农业大学,北京100083

出　　处：《灌溉排水学报》2016年第10期42-46,共5页Journal of Irrigation and Drainage

基　　金：国家自然科学基金项目(51379210);生态清洁小流域面源污染防控关键技术及集成模式研究项目

摘　　要：利用氢氧稳定同位素,探究了保水剂对玉米根系生长及其吸水特性的影响。采用盆栽试验,按照不同的保水剂埋施深度,设置CK、SAP、SAP15、SAP35共4个处理,测定了玉米茎水及土壤水中的氢氧同位素丰度和玉米根系形态。结果表明：玉米在拔节期、抽雄期、灌浆期的主要吸水深度为0～20、20～40、0～20 cm,保水剂的施用能够加速或延缓这种先下降再上升的趋势,但不能改变该趋势;保水剂能显著（P〈0.05）增加细根系（直径〈0.5 mm）的比例,促进根系生长并提高根系吸水性能;保水剂埋施深度浅时对根系生长的促进作用更明显,SAP、SAP15处理优于SAP35处理;〈0.5 mm玉米根系的比例变化规律与主要吸水深度变化规律相吻合。The effects of super absorbent polymer on maize root growth and its water absorption characteristics were explored using stable deuterium and oxygen isotopes. Through pot experiment, four treatments, CK, SAP, SAP15, SAP35, were set according to the different soil layers super absorbent polymer buried. Then deuterium and oxygen isotopic abundance of maize stalk water and soil water and the maize root morphology parameters were both measured. Results showed that： （1） during the jointing stage, tasseling stage, filling stage, the main wa- ter uptake layers were 0N20, 20-40, 0-20 cm respectively. Application of super absorbent could accelerate or de- lay the change of main water uptake layer in different periods, but could not change the trend; The super absorbent polymer could significantly（P 〈 0.05） increase the proportion of fine root （diameter 〈 0.5 mm）, promoting root growth and improving the root water uptake performance; Treatments which super absorbent polymer were buried in shallow depth could promote the root growth more significantly, SAP and SAP15 were better than SAP35; The super absorbent polymer effect on proportion of maize fine root （diameter 〈 0.5 mm） was consistent with the law of root main water uptake layer change, which was obtained from stable isotopes analysis.

关 键 词：氢氧稳定同位素 保水剂 玉米 根系形态 吸水特性 

分 类 号：S513[农业科学—作物学]