<正>通过改变石膏水化过程中缓凝利品种以及添加量。借助扫描电镜（SEM）法,观察石膏结晶形态。再利用原子吸收光谱（AAS）测量不同pH条件下石膏水化体系中游离态Ca2+浓度变化曲线。综合电镜图像以及石膏刨花板各项性能数据。从而建立石膏水化过程中Ca2+含量变化和石膏结晶形态与石膏刨花板各项性能之间的内在联系。

Through collecting, isolating and cultivating the pine phyllosphere microbes, several isolates were selected to test their antagonistic effect to Sphaeropsis sapinea and Pestalotiopsis sp. By the method of dual culture, the result showed that the isolates with obviously antagonistic ability to Sphaeropsis sapinea and Pestalotiopsis sp. contained six kinds of bacteria, three kinds of yeast and three kinds of Trichodermas sp., which perhaps could be used for biological control. The antagonistic effect of bacteria is the highest, secondly Trichoderma sp. and yeast lastly. The standard for screening antagonistic fungus is relatively restraining the effect of a fungus. At the same time the restrained proportion and the characteristics leading to disease for the fungus should be considered.