新疆春小麦干物质积累分配动态与产量形成

通过三年对两个春小麦品种试验研究,说明春小麦干物质积累强度以拔节至灌浆盛期最大.干物质积累的动态全株、主茎、穗、茎和分蘖是S型曲线,叶片、叶鞘和全叶干物质积累呈抛物线.全叶干物质积累与叶面积系数、主茎叶面积,单株叶面积消长动态一致.开花后伴随籽粒干物质积累增加,其他非经济器官干物质积累呈有规律的向籽粒转移.叶、鞘、茎三者转移量,叶片>叶鞘>茎,它们转移总量占籽粒重30%左右.

Yield Formation and Distribution of Dry Matter Accumulatin of Spring Wheat in Xinjiang

The three-year experiment on two spring wheat varieties demonstrates that the highest acculating intensity of dry matter is at the period from shooting to most active filling. The change tendencies of dry matler accumulation in a whole plant, main stem, ear and tiller. exhibit Syshaped curve. The accumulating changes of dry matter in a leafblade, sheath and the whole leaf are parabolic. The accumulating change of dry matter of the whole leaf is in the same tendency as the leaf area index (LAI), the main stem area and the leaf area pervpiant do. Along with the increase of dry matter accumulation in seeds, the accumulated dry matter in noneconomic organs transfers regularly to seeds. The compari-sion of transferable amount of dry matter to seeds is as follows: leaf >sheath> stem. The amount of dry matter in the above three is about 30% of the seed weight.