【摘要】 连续两年以23个玉米品种为材料，通过分析半紧凑型和紧凑型品种冠层结构参数叶面积指数(LAI)、无截获散射(DIFN)和叶倾角(MTA)以及农艺性状，明确不同株型冠层结构差异及其对水氮调控的响应。结果表明，紧凑型品种通过保持较大的MTA和较高的DIFN来改善冠层结构，提高群体通风透光。2019年紧凑型品种的DIFN和MTA分别较半紧凑型品种显著提高了23.19%和5.07%。品种间冠层结构参数以DIFN变异最大，MTA变异最小。灌溉和施氮均显著提高群体LAI，降低DIFN，且灌溉显著减小紧凑型品种的MTA。半紧凑型和紧凑型品种分别在灌溉和施肥(WN2、WN1)处理下获得较高的LAI、较小的DIFN，实现冠层结构的优化。水氮耦合对群体MTA的调控因株型和冠层位置的不同而存在差异。更多还原

【Abstract】 This study used 23 maize cultivars with semi-compact and compact types as materials for two consecutive years. And canopy characteristics such as leaf area index(LAI), diffuse non-interceptance(DIFN), leaf inclination(MTA) and agronomic traits were analyzed to clarify the differences in canopy structure between the two plant types and their responses to irrigation and nitrogen regulation. The results showed that the compact cultivars improved canopy structure by retaining larger MTA and higher DIFN to improve the group ventilation and light transmission. The DIFN and MTA of the compact cultivars improved significantly by 23.19% and 5.07%, respectively,compared to the semi-compact cultivars in 2019. Among the canopy structure parameters, DIFN exhibited the largest variation, while MTA exhibited the smallest variation. Irrigation and nitrogen fertilizer application significantly increased the LAI, while decreased the DIFN, and irrigation also significantly reduced the MTA of compact maize cultivars. Semi-compact and compact maize cultivars obtained higher LAI and lower DIFN under WN2 and WN1 treatments, respectively, thereby optimizing the canopy structure. Nevertheless, the regulation effect of water-nitrogen coupling on population MTA varied with plant type and canopy position.更多还原