水稻栽后植株氮素积累特征及其与根系生长的关系  

Characteristics of nitrogen accumulation and its relationship with root growth of rice after transplanting

作　　者：任万军[1] 杨文钰[1] 伍菊仙[1] 樊高琼[1] 杨振华[1] 

机构地区：[1]四川农业大学农学院,四川雅安625014

出　　处：《植物营养与肥料学报》2007年第5期765-771,共7页Journal of Plant Nutrition and Fertilizers

基　　金：国家粮食丰产科技工程项目(2004BA520A05);四川省攻关项目(04NG020-013)资助

摘　　要：以冈优22、Ⅱ优162和K优047为材料,通过大田试验研究了不同种植方式下水稻秧苗栽后根系和地上部氮素积累的动态特征及其与根重的关系。结果表明,栽后40 d内,地上部及根系氮素积累量呈指数模型增加。茎鞘、发根节和叶片氮含量与根重呈极显著正相关;根系氮含量与根重呈显著负相关;各器官氮积累动态与根重均呈极显著的正相关关系。全生育期植株氮积累量拟合Logistic曲线较好,决定系数在0.988以上,氮素积累量与根重呈显著的正相关关系,生育期越靠前,相关系数值越大。3种种植方式中,自移栽至孕穗期氮积累量以常耕插秧最高,常耕抛秧其次,免耕高留茬抛秧较低;孕穗后免耕高留茬抛秧各器官氮含量最高,氮积累量也逐渐超过常耕抛秧。3个杂交稻组合中,前期以冈优22的氮积累量最高,后期Ⅱ优162增加速率较快,K优047在整个生育期中均最低。To study the characteristics of nitrogen accumulation （NA） of root and shoot, and its relationship with root dry weight （DW） of rice, a split-plot design with three replications, was used with 3 tillage and cultivation methods as main plot treatments and 3 varieties as the subplot treatments. The tillage and cultivation method treatments included conventional tillage transplanting rice （CTF）, conventional tillage broadcasted rice （CTB） and the broadcasted rice among high standing-stubbles under no-tillage condition （BSNT）. The dry weight and nitrogen content of stem and sheath, leaf blades, rooting joint, root system and panicles were measured. The results showed that during 40 d after transplanting, NA dynamics of root system and top part were well fitted for the index model. The nitrogen content （NC） of stem and sheath, rooting joint and leaf blade were positively correlated with DW of root system, but NC of root system was negatively correlated with DW of root system. At the same time, the relationships between NA dynamics of all organs and DW of root system were consistent and their positive correlation coefficients were highly significant. NA dynamics of plant was well fitted for logistic [ y = a/（ 1 ＋ be^-cx ） ] equations and all of the coefficients of determination （R^2） of the equations were above 0. 988. Moreover, there were significantly positive correlation between NA and DW of root, with R^2 being higher at early stage. Among different tillage and transplanting methods, CTF had the highest NA of different organs and NA of BSNT was the lowest from transplanting to booting. After booting, NA of BSNT surpassed CTB gradually due to its highest NC of each organ. In early stage, Gangyou 22 had the highest NA, but in late stage, Ⅱ you 162 had a higher rate of NA. The NA of K you 047 was the lowest during the whole growing season.

关 键 词：水稻 氮素积累 根系 全氮含量 

分 类 号：S511[农业科学—作物学]