河套地区覆膜与裸地玉米随地积温变化的生长动态模型

利用实测资料和Logistic方程，分覆膜和裸地两种情况建立玉米根系和地上部分干物质随地积温变化增长的动态模型，模型均通过了0.001水平的显著性检验。由模拟结果可见，覆膜玉米土壤耕层地温的增高，有效地促进了根系的生长，覆膜玉米根长、根干重、根数、根体积均比裸地玉米长（多）7.5cm、16.3g、17.5条、3.6cm^3；覆膜玉米株高、茎干重、叶干重、LAI、穗干重、地上部分干重也均比裸地玉米高（多）4.1cm、19.7g、3.2g、0.6、253.5g、455.4g。说明只要改善环境条件尤其是地温，就可以促进玉米生长和提高产量。

Dynamic Growth Models Joint with Changes of Accumulated Soil Temperature for Corn Mulched and Unmulched with Plastic Film in Hetao Areas of Inner Mongolian Autonomous Region

Based on the observed data and logistic model, dynamic growth models joint with changes of the accumulated soil temperature for corn mulched and unmulched with plastic film in Hetao areas of the Inner Mongolian Autonomous Region were established. The simulated results showed that by plastic film mulching the soil temperature increased and the growth of corn roots was effectively accelerated. The length, dry matter number and bulk of roots by plastic film mulching were higher by 7.5cm, 16.2g, 17.5, 3.6 cm^3 respectively than that without mulching. The height of plant, dry matter of stem, dry matter of leaves, leaf area index and dry matter above ground were more by 4.1cm, 19.7g, 3.2g, 253.5g and 455.4g respectively than that without mulching. The corn growth and yield were improved by plastic film mulching.