胸部 X 线摄影检查在临床上应用较为普遍,尤其在劳动卫生保护方面更有其重要意义。我县范围内,中央、省、市、县属厂矿和乡镇企业多,分布广,尘毒治理较差,接触尘毒的作业工人较多,每年的尘肺照片(包括普查)数量大。提高胸片质量,是我们...胸部 X 线摄影检查在临床上应用较为普遍,尤其在劳动卫生保护方面更有其重要意义。我县范围内,中央、省、市、县属厂矿和乡镇企业多,分布广,尘毒治理较差,接触尘毒的作业工人较多,每年的尘肺照片(包括普查)数量大。提高胸片质量,是我们 X 线工作者的主要任务。尘肺胸片要求质量高,才能达到满意的诊断效果。展开更多
the investigation was carried out on 10-year-old plantation of Fraxinus mandshurica in Mao抏r Mountain Experimental Station of Northeast Forest University. Tree height (H), diameter at breast height (D1.3) and the inc...the investigation was carried out on 10-year-old plantation of Fraxinus mandshurica in Mao抏r Mountain Experimental Station of Northeast Forest University. Tree height (H), diameter at breast height (D1.3) and the increment of tree height in 5 years (H5), the thickness of humus layer, as well as the soil moisture were measured for the plantation and the growth indexes (H, D1.3, H5) for different site conditions were analyzed. The results showed that main site factors influencing the growth of Fraxinus mandshurica were soil moisture, gradient and location of slope in order. The growth of Fraxinus mandshurica was better on the middle- or up-slope site than on the down-slope site. Soil moisture and late frost caused by terrain are the main reasons that limit the growth of Fraxinus mandshurica plantation.展开更多
文摘胸部 X 线摄影检查在临床上应用较为普遍,尤其在劳动卫生保护方面更有其重要意义。我县范围内,中央、省、市、县属厂矿和乡镇企业多,分布广,尘毒治理较差,接触尘毒的作业工人较多,每年的尘肺照片(包括普查)数量大。提高胸片质量,是我们 X 线工作者的主要任务。尘肺胸片要求质量高,才能达到满意的诊断效果。
文摘the investigation was carried out on 10-year-old plantation of Fraxinus mandshurica in Mao抏r Mountain Experimental Station of Northeast Forest University. Tree height (H), diameter at breast height (D1.3) and the increment of tree height in 5 years (H5), the thickness of humus layer, as well as the soil moisture were measured for the plantation and the growth indexes (H, D1.3, H5) for different site conditions were analyzed. The results showed that main site factors influencing the growth of Fraxinus mandshurica were soil moisture, gradient and location of slope in order. The growth of Fraxinus mandshurica was better on the middle- or up-slope site than on the down-slope site. Soil moisture and late frost caused by terrain are the main reasons that limit the growth of Fraxinus mandshurica plantation.
