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301.
本文对陇海铁路宝天段路基的地质地理及气象因素进行了综合分析。认为气象因素是路基灾害的主要原因,是触发机制,尤其是路基选址不当所产生的路基气象综合效应更加重了灾害程度.文章认为,设计铁路时,不但要注意气象条件的研究,同时要模拟研究路基与气象条件相互作用所产生的气象效应. 相似文献
302.
EffectsofsimulatedacidrainontheinjuryandphysiologicalresponsesofcropsZhangFuzhu,YangXiaofeng,ZhangJingyang(ResearchCenterforE... 相似文献
303.
佛山市区酸雨时空分布特征及其成因分析 总被引:1,自引:0,他引:1
从致酸源、地理环境、工业状况、气候条件等因素分析了佛山市酸雨的成因,提出一些控制酸雨污染的建议。 相似文献
304.
The effects of simulated acid rain with pH values of 6.63 (control, 4.5, 3.0, and 2.0 on saplings of Pinus massoniana and Cunninghamia lanceolate, were studied. The results showed that the pH of C.lanceolate, leaf sap and soil decreased as the acidity of rainfall increased. The acid rain with very low pH had significant effects on the photosynthetic rates per plant, but not on that of the per unit weight of dry leaves. The respiration rates of the two species were stimulated. Root and leaf boimass, but not stem biomass, were also reduced tremendously during a seven months period. 相似文献
305.
306.
Shen Ji Zhao Qianxue Zhang Xiaoshan Zhang Baozhu Zhao Dianwu Fan Zenghu Cheng Panjiang 《环境科学学报(英文版)》1991,3(1):41-58
-The concentrations of gas phase SO2, O3 and chemical composition of sequential rainwater samples were measured on 6/11/88 to 6/28/88 at some sites of Guiyang area. S (IV) was present in great excess of H2O2 in rainwater samples collected at residential sites of the city corresponding to high level of gas phase SO2. Considerable H2O2 in rainwater samples was observed in background air at suburbs. The evidence that clean rainwater samples were collected at 20km away from the city in 6/18/88 precipitation event revealed that the major process of acidification of the rain in the high polluted areas was below-cloud scavenging of trace gases. From a simulation calculation it was found that the rate of oxidation of S(IV) by O3 and by Mn2+, Fe3+ catalytic in high pH rainwater is significant, but for low pH the major SO42- is produced by the reaction of S (IV) with H2O2. 相似文献
307.
雨水中微量过氧化氢的间接原子吸收测定 总被引:6,自引:0,他引:6
通过过氧化氢与重铬酸钾的定量反应,用原子吸收测铬的方法达到测定过氧化氢的目的。试验表明,该法用于雨水中微量过氧化氢的测定,试验令人满意,且操作方便。 相似文献
308.
Several factors, namely, coal-dominated primary energy mix, extensive economic development mode, inefficient energy utilization, end the imperfect environmental regulations, result in the serious urban sulfur dioxide pollution end large-scale sulfatetype acid precipitation in China. In 1995, China's sulfur dioxide emissions reached 23.70 Mt, and the areas affected by acid rain accounted for 40% of the territory. Chinese government accords considerable importance to the sulfur dioxide end acid rain contamination. New sets of environmental friendly policies have been promulgated. But enforcement of laws and regulations on SO2 emissions need to be further improved and broadened, especially those respond to market conditions. This paper focuses particular attention on the analysis of strategy, policies, and national actions which had or should be taken against sulfur dioxide emissions nationwide to achieve the environmental targets, on the basis of which gives the technical options in future. 相似文献
309.
黔北地区土壤中活性铝的分布调查 总被引:2,自引:0,他引:2
本研究对黔北地区土壤中活性铝的分布进行了分析,结果表明该地区目前土壤活性铝含量的平均水平较低,对于农田及森林系统尚不致有严重影响,但酸性降水对该地区黄壤中铝的溶出有潜在性危害作用。 相似文献
310.