种植密度对新疆膜下滴灌棉花群体光合速率、冠层结构及产量的影响

Effects of planting densities on canopy apparent photosynthesis, canopy structure and yield of cotton drip-irrigated under the mulch in Xinjiang

摘要: 田间试验研究了3个水平的种植密度（21万株/hm²、24万株/hm²、27万株/hm²）对膜下滴灌棉花群体光合速率（CAP）、冠层结构及产量的影响。结果表明北疆棉区适宜播种条件下，24万株/hm²密度的群体冠层结构优于其他密度，生育后期仍可保持较高CAP，叶面积指数高值持续期进入早、持续时间长，光合物质累积多且分配到生殖器官中的比例大，皮棉产量较高。

Abstract: The field experiments on the effects of 3 planting densities on the canopy apparent photosynthesis, canopy structure and yield of cotton drip-irrigated under the mulch were conducted in earlier harvest area of North Xinjiang. The results indicate that the optimum population density of the cotton is 240000 plantlets/hm², under which the canopy structure, canopy apparent photosynthesis, leaf index, dry matter accumulation and distribution and lint yield of cotton are better than those under other densities.