The pattern speed of the bar in NGC 4596

The pattern speed is a defining parameter of any barred galaxy. A large number of model-dependent techniques have therefore been developed to derive the pattern speed. However, the only model-independent technique for measuring this quantity – the Tremaine–Weinberg method – has hitherto been applied to just one case, the SB0 galaxy NGC 936. In this paper, we apply the technique to a second system, the SBa galaxy NGC 4596. The resulting estimate for the pattern speed is Ω_p=52±13 km s⁻¹ kpc⁻¹. This result is corroborated by a spectrum obtained along the major axis of the bar in this system. The corotation radius associated with this pattern speed lies just beyond the end of the bar indicating a fast bar. Combining the bar major-axis spectra with data obtained from a Hubble Space Telescope WFPC2 image, we also find strong evidence for a nuclear disc.     

不同水肥处理的沙地玉米生长分析

在奈曼站农业观测场进行了5种水肥处理的玉米生长试验。结果表明,各处理的玉米株高快速生长期均从6月下旬始,至8月初达最高值。不施肥处理株高和茎粗生长在拔节后期落后于其他处理,早于其他处理停止生长。根量快速增长从6月底开始,至7月底结束,8月下旬根开始死亡,至9月20日,细根数量减少至峰值期的50%。高肥处理的根系增长率高于其他处理,其根密度值最大,不施追肥处理的最小。不浇水的处理在7月初雨季到来时根系开始快速增长。不施追肥的处理早于其他处理7d停止根系的增长。5种不同处理的根系生长动态趋势一致,均为单峰形。施肥量最大的处理(T₁)产量最高,不施肥的处理产量最低。玉米生长期多次灌溉并不能促进生长,相反使产量减少。     

半荒漠风沙区土地沙漠化生物整治技术的研究

试验证明,土地沙漠化生物整治技术能在半荒漠风沙区取得显著的作用和效果。在柠条、毛条、花棒、杨柴、沙木蓼等灌木树种的适生立地上营造防风固沙林,林后3~4年,灌木就可郁闭成林,流动沙丘完全被控制变为固定沙丘;林下植被结构得以改善,优良品种增多,如能合理开发其饲料等用途,还具有十分可观的经济效益。