排序方式: 共有9条查询结果,搜索用时 15 毫秒
1
1.
李素云 《水资源与水工程学报》2012,23(2):172-174
在对黄陵县水土流失现状分析的基础上,进行了水土流失重点防治三区划分,划定了水土流失重点预防保护区、重点监督区和重点治理区范围,并针对分区的水土流失特点,提出了防治对策和措施,对指导当地水土保持和生态环境治理工作有一定现实指导意义。 相似文献
2.
WEI Xiaorong SHAO Mingan SHAO Hongbo GAO Jianlun XU Gang 《Canadian Metallurgical Quarterly》2011,85(1)
Plants play an important role in soil phosphorus nutrition. However, the effect of plants on phosphorus nutrition in soils of the Loess Plateau of China is not well understood. This study was conducted to reveal the relationships between plants and phosphorus' fractions and availability in the Loess Plateau of China. Twenty-two plant communities were surveyed and soil samples under different plant canopies were collected for the determination of soil properties and inorganic phosphorus fractionation. The results showed that Leguminosae and Lilaceae reduced pH and increased organic matter, cation exchange capacity, total and Olsen phosphorus in soils under their canopies, while Labiatae and Rosaceae increased pH and decreased organic matter, cation exchange capacity, total and Olsen phosphorus in soils under their canopies. The contents of Ca2P, CasP, AI-P and Fe-P were highly related with soil Olsen phosphorus. They were all higher in soils under Leguminosae and Lilaceae and lower in soils under Labiatae and Rosaceae. The results of this study indicate that Leguminosae and Lilaceae improved phosphorus nutrition in soils, yet Labiatae and Rosaceae impeded the improvement of phosphorus nutrition in soils under their canopies, which will be of more help to instruct vegetation restoration in the region and provide information for soil development. 相似文献
3.
分别从工艺和设备角度分析了气流干燥塔发生落料的原因,通过提高风机送风量,并在气流干燥塔进料段下方增设喉管,较好地解决了落料问题,增加了装置生产能力,提高了产品质量。 相似文献
4.
氯碱化工废水综合利用 总被引:2,自引:0,他引:2
介绍了氯碱生产各装置区废水及蒸汽冷凝液的综合利用情况。通过优化工艺设计最大程度实现了水资源综合利用。 相似文献
5.
介绍了电石法PVC树脂生产企业对破碎、输送过程中产生的电石粉尘采用合理工艺进行回收利用,通过实际数据说明该工艺具有显著经济效益和社会效益。 相似文献
6.
阐述了70 m3聚合釜的入料及反应过程中的安全控制方法及应急救援预案,详细介绍了聚合反应过程中异常现象的判断及应对措施,停电情况下的紧急处理措施,并对DCS系统的改进提出了建议。 相似文献
7.
8.
9.
1