超高产杂交制种的关键技术措施

目前杂交棉制种是依靠人工去雄,辅之以外来花粉授精成铃,从而获得杂交种子,该项技术的工作量较大,种子成本高,在现有基础上如何提高制种产量,提高生产效率,则是最直接最快速降低生产成本的有效方法,也是杂交棉产业化的主要途径.     

人工马尾松复层混交林林分结构规律的研究

From the analysis and simulated study on the stand structures of present the multi-stories mixed uneven-agedPinus massoniana planted forests in Fujian, the correlationships between stand diameter distribution structure, stand stockdistribution structure, tree height and DBH were obtained. Several proposals for the rational management and structure ad-justment of the present forests were put forward.