论文部分内容阅读
苗期的群体结构和苗木的最终产量是紧密相关的;而苗木的高度、地径、叶量和根量等又是直接反映苗木质量的指标,苗木的产量和质量是通过密度来调节的。因此,寻求苗期生长和密度的关系,以便找出培育高质量苗木的密度结构则是本试验的目的。一、试验区概况、试验材料和方法试验区位于北京市西南部九龙山苗圃,圃地土壤肥力中等,全氮0.070-0.087%,速效磷0.089-0.300毫克/100克土,速效钾15.650
Seedling population structure and the final production of seedlings are closely related; and seedling height, diameter, leaf volume and root volume and other indicators of the quality of seedlings is a direct indicator of nursery stock yield and quality through the density to adjust. Therefore, the search for the relationship between seedling growth and density in order to find out the density of nurturing high-quality seedlings structure is the purpose of this experiment. First, the experimental area profiles, test materials and methods Experimental area is located in Jiulongshan nursery in southwestern Beijing, nursery soil fertility, total nitrogen 0.070-0.087%, available phosphorus 0.089-0.300 mg / 100 grams of soil, available potassium 15.650