稻鸭共作下水稻植株的壮秆效应及生理特性

通过田间小区对比试验，分析了稻鸭共作下水稻植株的壮秆效应及其相关生理特性.结果表明：由于鸭子在稻田的活动使水稻植株形态发生了明显变化，植株碳水化合物含量、植株碳氮比、茎秆干物质输出率都明显增加，茎秆基部节间长度比对照缩短2.88%，茎粗增加64.90%，茎秆强度和抗倒伏指数也分别提高了11.78%和10.95%;稻鸭共作提高了水稻深层根系比例和根系活力，黑根比例降低了16.63%.因此，稻鸭共作对水稻植株有壮秆效应，提高了植株的抗逆性，有利于水稻稳产高产.

Strong stem effect and physiological characteristics of rice plant under rice-duck farming.

A field plot comparison experiment was conducted to study the strong stem effect and physiological characteristics of rice plant under rice-duck farming. The results showed that under rice-duck farming, the morphology of rice plant changed obviously, and the carbohydrate content and C/N ratio of the plant as well as the dry matter output from rice stem increased significantly, due to the activities of duck in paddy field. In the meantime, the length of basal internodes decreased by 2.88%, while the stem diameter, stem mechanical strength, and stem lodging resistant index increased by 64.90%, 11.78%, and 10.95%, respectively. Rice-duck farming increased the root mass and root vitality in deeper soil layers, and decreased the proportion of black roots by 16.63%. It was indicated that rice-duck farming benefited the formation of strong rice stem and increased the stress resistance of rice plant, which would be favorable to the stable and high-yielding of rice.