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我国 195 0 s～ 1990 s期间主要推广玉米品种 (Zea mays L .)根系活力随播种后天数的变化可用高斯模型作较好地模拟 ,根系活力随生育进程的推进先增后降 ,呈单峰曲线变化 ,在籽粒灌浆期 (播种后 6 7～ 74天 )达到高峰 ;上层 (0～ 2 0 cm )根系活力高于下层。随玉米品种更替根系活力增强 ,在 4 0～ 10 0 cm根层和生育后期更为突出。对根系生长的高斯方程积分 ,求得“根系活力日积”(RVDI) ,当代品种各生育阶段的 RVDI远高于 1970 s和 195 0 s品种 ,且在灌浆期间 (播种后 6 7天至 90天 )这种差别最大。根系中可溶性蛋白含量、 ATPase活性随品种更替呈递增趋势 ,且在距离植株 10～ 15 cm的横向空间内活性提高最大 ,当代品种在 10～ 2 5 cm的横向空间内 ATPase比活性具有优势
The root activity of main maize varieties (Zea mays L.) popularized in China from 195 0 s to 1990 s can be simulated better by the Gaussian model. The root vitality increased first and then decreased with the progress of fertility, showing a single peak The curve changed at the grain filling stage (67 ~ 74 days after sowing), and the root activity of the upper layer (0 ~ 20 cm) was higher than that of the lower layer. The root activity increased with the replacement of maize varieties, which was more prominent in the root layer and later growth period from 40 cm to 100 cm. The RVDI of root activity was obtained by integrating the Gaussian equation of root growth. The RVDI of each stage of contemporary cultivars was much higher than that of 1970s and 195 0 s. During the filling period (67 days to 90 days after sowing) Day) the difference is greatest. The content of soluble protein and the activity of ATPase in root system increased gradually with the change of varieties, and the activity increased most in the horizontal space of 10 ~ 15 cm away from the plant, and the activity of ATPase in the lateral space of 10 ~ 25 cm