育苗基质不同水分含量与基质物理性状的相关性分析

试验以草炭、蛭石和珍珠岩3种物料复合配制的育苗基质为材料，采取烘干、自然晾干、加水润湿措施，研究基质在含水量0～65．56％范围内自然垒结、饱和水和持水状态体积变化以及容重、比重、孔隙特性的变化相关性。结果表明，基质含水量影响基质颗粒粒径大小分布和孔隙特性；保持基质各级粒径均匀、稳定分布状态以及包装、运输环节维持基质物理结构的适宜水分为32．63％左右；应用基质育苗时，保持基质良好的孔隙特性和体积数量，其适宜的基质水分为32．63％～40．32％。

The Correlation Analysis between Substrate Moisture and Physical Properties

To unravel the correlation between substrate moisture and physical properties by taking drying, natural dry and water wetting, the experiment was used substrate which were composited with peat, vermiculite and per lite as material. The results showed that the moisture content of substrate affected the distribution characteristics of particle size and pore properties. The appropriate moisture was about 32.63% which could maintain appropri ate physical structure, such as particle size uniform, stable distribution under packaging and transport links. When the substrate was used to seedling,the appropriate substrate moisture was at 32.63%-40.32% ,and it could keep good porosity characteristics and volume number.