与冬小麦间作条件下轮台白杏间作巷道光环境特征

摘要

[目的]通过度量与冬小麦间作条件下株行距3m×6m轮台白杏间作巷道内冬小麦不同生育期饱和光合有效辐射(PAR)时空窗的大小,旨在深入了解间作巷道内与间作物生长发育需求相适应的光环境变化特征,以期为轮台白杏与冬小麦间作系统的栽培管理提供科学依据.[方法]利用Li-6400XT便携式光合作用测定仪和LI-191线状量子传感器分别测定冬小麦不同生育期光合生理参数和间作巷道内冬小麦冠层光合有效辐射.[结果]冬小麦不同生育期光饱和点(LSP)成熟期＜拔节期＜灌浆期；与冬小麦间作条件下,株行距3m×6m轮台白杏间作巷道内冬小麦饱和光合有效辐射时空窗灌浆期＜拔节期＜成熟期.[结论]不同生育期中,冬小麦灌浆期的光饱和点最高.轮台白杏与冬小麦间作系统中,间作巷道内冬小麦灌浆期的饱和光合有效辐射时空窗最小,使得灌浆期冬小麦的光能利用能力不能充分发挥,是导致冬小麦减产的主要因素之一.%[Objective] By measuring spatio-temporal window size of the saturation photosynthetic active radiation (PAR) at different growth stages of winter wheat in intercropping alley of Armeniaca vulgaris'Luntaibaixing' at planting spacing of 3 m × 6 m,this study aims at having in-depth understanding of light environment variation characteristics in intercropping alley in conformity with the requirements of intercropping growth and providing a scientific basis for better cultivating intercropping system of A.vulgaris Luntaibaixing'and winter wheat.[Method] Portable photosynthesis instrument Li-6400XT and linear quantum sensors instrument LI-191 were used respectively to measure the photosynthetic physiological parameters and canopy photosynthetic active radiation at different growth stages of winter wheat.[Result] Different growth stages of winter wheat light saturation point (LSP) were as follows:mature stage ＜ elongation stage ＜ grain filling stage.The spatio-temporal window size of winter wheat saturation photosynthetic active radiation in intercropping alley of A.vulgaris' Luntaibaixing' at planting spacing of 3 m × 6 m with winter wheat were as follows:grain filling stage ＜ elongation stage ＜ mature stage.[Conclusion] At different growth stages of winter wheat,its light saturation point at grain filling stage reached the maximum.While in the intercropping system of A.vulgaris' Luntaibaixing' with winter wheat,the spatio-temporal window size of winter wheat saturation photosynthetic active radiation in intercropping alley came to the minimum.Therefore its light utilization capability could not function adequately,which was one of the main reasons for winter wheat yield decreasing.