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941.
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943.
Soil Fertility Quality and Agricultural Sustainable Development in the Black Soil Region of Northeast China 总被引:2,自引:0,他引:2
The black soil in northeast China is considered one of the most fertile soils in China. Consequently, the black soil region has become one of the most important regions for cereal grain production in China. Agriculture has developed rapidly since the early part of the nineteenth century. To date, approximately 70 percent of total land in the area is cultivated. Even though the agricultural production in this region is increasing continuously, some soil fertility quality problems have become serious. This is hampering agricultural development and sustainability in the region. A brief history of population growth and agricultural development in the region is presented. Major soil quality problems, particularly soil degradation and soil erosion, are analyzed. Based on studies, suggestions for improving soil quality and for promoting sustainable agricultural development in the region are presented. These suggestions include improving agricultural landscape patterns, developing conservation cultivation, promoting combinations of crop production with combinations of forestry and animal husbandry, and implementing integrated management for soil and water conservation. 相似文献
944.
The effects of probable climate change—an increase in atmospheric CO2(by two times), air temperature, precipitation—on CO2exchange and temperature dependence of net photosynthesis in the larch and Siberian stone pine undergrowth formed in the light larch forests of West Siberia were studied in chambers with an artificial climate. The change of the aforementioned ecological factors caused an increase in the temperature optima of photosynthesis and the range of optimum temperatures (in the case of Siberian stone pine, to a slightly greater degree). Therefore, the ranges of both species may broaden, and the Siberian stone pine can expand to the north, displacing larch tree stands. 相似文献
945.
重视职工安全心理与需要 总被引:2,自引:0,他引:2
通过对职工安全心理过程 ,职工个性差异 ,管理人员安全心理以及职工安全需要的分析 ,阐述了其与企业安全生产的关系 ,并提出了满足职工安全需要 ,促进企业安全生产的途径 相似文献
946.
通过热水锅炉内加药水处理的工作实践帮对易产生结垢的原因分析,提出了高寒地区热水锅炉锅内加药水处理的可行性和具体实施方案。 相似文献
947.
Rattigan O. V. Dutkiewicz Vincent A. Das Mita Judd C. D. Husain Liaquat 《Water, Air, & Soil Pollution: Focus》2001,1(5-6):391-400
In-cloud oxidation of SO2 byH2O2 was investigated using a tracertechnique based on SO2–
4/Se ratios atWhiteface Mountain, New York during summer months from1990 to 1998. Cloud water samples collected at themountain's summit (1.5 km above mean sea level) andaerosols at a below cloud site (Lodge) located at 0.6km amsl and in cloud interstitial air at the summitwere analyzed for SO2–
4 and selectedtrace elements. Gaseous SO2 andH2O2were measured in realtime. Cloud water pH wasgenerally below 5.0 with a mean value of 3.6. Theresults show that significant in cloud oxidation occursin clouds during summer months varying from belowdetection to 62% with on average approximately 24% ofthe cloud water SO2–
4 produced from in-situ SO2 oxidation. During summer the clouds wereoxidant limited for approximately one third of thetime. 相似文献
948.
Mining with communities 总被引:2,自引:0,他引:2
Marcello M. Veiga Malcolm Scoble and Mary Louise McAllister 《Natural resources forum》2001,25(3):191-202
To be considered as sustainable, a mining community needs to adhere to the principles of ecological sustainability, economic vitality and social equity. These principles apply over a long time span, covering both the life of the mine and post-mining closure. The legacy left by a mine to the community after its closure is emerging as a significant aspect of its planning. Progress towards sustainability is made when value is added to a community with respect to these principles by the mining operation during its life cycle. This article presents a series of cases to demonstrate the diverse potential challenges to achieving a sustainable mining community. These case studies of both new and old mining communities are drawn mainly from Canada and from locations abroad where Canadian companies are now building mines. The article concludes by considering various approaches that can foster sustainable mining communities and the role of community consultation and capacity building. 相似文献
949.
流域地表生态信息的卫星遥感图像处理技术 总被引:1,自引:1,他引:0
以福建省九龙江流域为例,利用计算机技术和遥感-GIS工具软件,探讨利用多源卫星遥感影像获取流域地表环境信息的图像处理与分析技术,列举卫星遥感可获取的流域地表生态环境专题信息。重点分析利用遥感-GIS界定流域范围的方法、流域地表覆盖状况和植被覆盖密度的卫星遥感影像处理方法。 相似文献
950.