新疆高光强条件下小麦群体光合能力的研究

Research on the Canopy Photosynthesis Capacity of Wheat on Condition of High Luminous Intensity in Xinjiang

对新疆大陆性气候条件下春小麦群体光合能力进行研究，结果表明：新疆小麦在相同的光强下具有较高的群体表观净光合速率，具有较高的光合生产潜力，其CAP的值在-15～45μmol·m^-2．s^-1，与山东小麦群体光合能力比较，群体光补偿点相近，光饱和点高出1．5～3．0万lx，CAP最大值在拔节期高出4-7μmol·m^-2·s^-1，开花期高出6～10μmol·m^-2·s^-1；温光效应分析表明，光强是影响新疆春小麦群体光合能力主导生态因子，中午光强超过光饱和点是造成群体光合“午休”现象的重要原因。

In this experiments, two main varieties of Xinjiang spring wheat possessing of different plant shape were planted, and inseminated in four phases. The purpose of the studies was analyzing Canopy Photosynthesis Capacity under the continental climate condition in Xinjiang. It was drawn out, that experimental wheat has the higher CAP value under the same luminous intensity, and has the higher photosynthesis productive potential. The value of Canopy Apparent Photosynthesis （CAP） ranged between -15～45μmol·m^-2.s^-1. Compared to wheat in Shandong Provinee, tbe Light Compensation Point was almost equal,and Light Saturation Point was 15 ～ 30 thousands Ix higher, and the highest value of CAP was 4-7μmol·m^-2·s^-1 higher at elongation, 6～10μmol·m^-2·s^-1 .higher at florescence. After analyzing influence of temperature - light, it can be put forward that sun luminosity was dominating natural factor which affected CAP, and one of crucial cause of ＂siesta＂ phenomenon was high sun luminosity. More studies about it shall be propitious to improve Canopy Photosynthesis Capacity of wheat in Xinjiang.