断伤作物根系对籽粒产量与水分利用效率的影响研究现状及问题

Effect of crop root-cutting on grain yield and water use efficiency:a review

就断伤作物根系对作物生长、产量形成及水分利用效率的影响方面的研究文献进行了评述,并提出了需要进一步探讨的若干问题.断根对作物地上、地下部生长状况及产量的影响与断根时间、程度直接相关.现有的能够与作物断根效果相联系的田间管理措施,以中耕为代表.但断根对作物产量的影响的报道是不一致的,有表现出正向效应的结果,也有表现出负向效应的结果.需要深入探讨的是可能存在的对于产量与水分利用效率具有正向效应的断根程度与时间的优化组合,揭示其在不同作物上的表现,并探讨其作用方式与内在机理.

This paper reviewed the advances of researches in effect of rootcutting on crop growth,grain yield and water use efficiency,and pointed out some problems which should be studied further.The effect of rootcutting on aboveground growth,underground growth and yield of crop was directly related with the time and degree of rootcutting.The intercultivation was a typical measure of cropland management that could have related with rootcutting.However,different results were reported in effects of crop rootcutting on grain yield,including positive effects and negative effects.It is necessary to inquire into the optimum combinations of time and degree of rootcutting,which exist probably and have positive effect,to reveal their difference among crops,and study the inherent mechanism and working forms.