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Zoning of Agricultural Resource and Environment in China
Erqi Xu
Strategic Study of CAE 2018, Volume 20, Issue 5, Pages 57-62 doi: 10.15302/J-SSCAE-2018.05.009
Problems in China’s agricultural resources and environment have become increasingly prominent, with distinct resource and environment constraints for regional agricultures. Based on regional differentiation in agricultural resource and environment characteristics, this paper divided the country into 10 first-level zones and 57 second-level zones at the county scale. The first-level zones were divided according to regional differentiation in climate and geotectonic. And the second-level zones differentiate in water resources, land resources, and environmental conditions. It analyzed the agricultural production conditions, types of resources and their different combinations, environmental production conditions, and existing problems in these zones. This study proposed the strategies of “optimizing the spatial layout of eastern, central, and western regions” and “improving Northeast China, regulating North China, and recovering South China”. Twenty-seven second-level zones, undertaking the supply of major agricultural products in China, were identified and labeled as “major agricultural developing regions in China”. The development direction and construction measures of the major agricultural developing regions in China were suggested to maintain and improve the health and sustainability of China’s agricultural production system.
Keywords： 依据农业资源环境地域分异，以县域为制图单元，本文将全国划分为10 提高东北，整治华北，恢复南方 战略，并划分了27 个承担主要农产品供给保障功能的 ，指明其建设方向措施，以维护和改善我国农业生产系统的健康和可持续性
Water Resource Effectiveness of Vegetation Conservation and Restoration in North China
Sun Siqi,Chen Yongzhe,Wang Cong,Hu Qingfang,Lyu Yihe
Strategic Study of CAE 2022, Volume 24, Issue 5, Pages 97-106 doi: 10.15302/J-SSCAE-2022.05.012
In recent years, a series of ecological protection and restoration projects has been implemented in North China, and the vegetation conditions have changed significantly. Exploring the impact of regional vegetation restoration on the water circulation process and the balance of water supply and demand is important for improving ecological restoration strategies and realizing the sustainable utilization of regional water resources. This study conducted a comprehensive analysis using the Pearson correlation coefficient and Moran’s I index and based on multi-source water covariate data. The spatial and temporal variation of vegetation and different water covariates is analyzed, the water resource effects of vegetation conservation and restoration are identified, and the tradeoff between water resources and vegetation restoration is discussed. The results show that the effects of ecological protection and restoration projects are remarkable, with the net primary productivity increasing at a rate of approximately 2.3 times faster than that outside the project area; the vegetation expansion and evapotranspiration show strong spatial and temporal correlations; and the increase in evapotranspiration owing to vegetation restoration is the main reason for the deficit or significant reduction in water storage. Therefore, it is necessary to improve the implementation strategy of ecological restoration while considering the restriction of water resources on vegetation conservation and restoration, strengthen the dominant position of the ecosystem’s own resilience, and promote the sustainability of vegetation restoration and the sustainable use of regional water esources.
Keywords： North China ecological restoration projects evapotranspiration water storage net primary productivity atural restoration
Study on Fluvial Process and Regulations of Typical Shoal of Middle Yangtze River
Lu Yongjun,Liu Jianmin
Strategic Study of CAE 2002, Volume 4, Issue 7, Pages 40-45
Based on analyses of fluvial process and the reason of the shoal deformation, the shoals of the middle Yangtze River can be divided into three kinds, i.e. the shoals of the braided reach, the shoal of the straight transitional reach and the shoal of the bend. The influences of cut-off of the lower reach of Jingjiang River and river bed evolution on the shoal due to the set-up of Gezhouba Dam are briefly presention. The regulation principle and the regulation engineering preliminary layouts of the typical shoal are discussed.
Keywords： braided reach straight transitional reach bend shoal fluvial process regulations of waterways
“Water Resources in Northeast China” Project Group,CAE
Strategic Study of CAE 2006, Volume 8, Issue 5, Pages 1-24
Northeast China refers to the region including Liaoning Province, Jilin Province, Heilongjiang Province and the northeastern past of inner Mongolia Autonomous Region, i. e. Chifeng City, Tongliao City, Xing an League and Hulun Buir City. Covering an area of 124×104km2with a population of 119 million, this region features developed industries, biggest forest zone arid best grassland in China. It is the largest commodity grain base as well. However, the decades-long crude production and extensive management has resulted in the decline of part of industries and agriculture and the degradation of environment, such as the exhaustion of the fellable forest; the degeneration, desertification and salinization of grassland; the serious loss of black earth; the pollution of water sesources, the dry up of rivers and the decrease of wetland; the environmental problems in abandoned mining areas. The only choice for reinvigorating the northeast China old industrial base is to change the economic growth pattern timely and build the resource-conservation and environment-friendly society. The author brings forward eight strategic proposals: not increasing the total area of arable land, not decreasing the area of forest, grassland and wetland, and rationally controlling the land for urban and industrial use; tapping the huge potential of agriculture and building China's largest agricultural product base; taking further measures to ensure the sustainable development of the forest industry; promoting the urbanization process and properly address urban water resources crisis and preventing geological disasters in coal mine-based cities; enhancing geological prospecting to consolidate the guarantee of resources; protecting water environment and preventing water from pollution; controlling the use of water for socio-economic purpose in the western part of the region so as to protect the ecological environment; rationally allocating water resources to contribute the harmonious development between man and nature.
Keywords： northeast China allocation of land and water resources ecology and environment protection sustainable development
Ao Daguang,Zeng Zhicheng,Li Bo,Che Jinzhou
Strategic Study of CAE 2002, Volume 4, Issue 5, Pages 67-70
Given in this paper is successful experience in improvement of navigation channels in Pearl River, the largest river in South China. The reach to be improved is in the confluence zone of the West and the North Rivers. Various types of shoal exist in this waterway as a main stem for flood to progress. The flow condition is very complicated and improvement is very difficult. In this paper, based on a great deal of hydrological data and topographical data, analysis of hydro-dynamic conditions, water/sediment conditions and river bed evolution are pressented. In combination with scale modeling test, the mechanism for the shoals to grow is revealed and an improvement plan is drawn out according to the features of the waterway. According to the plan, in order to solve the deposition problem in Laoyazhou Shoal, groynes are built to move the flow diversion point and remove the circular flow on the shoal. The condition for deposition to occur is then destroyed and the shoal vanishes after improvement. The navigation channel becomes smooth. For the problems of “risk” and “shallow” at the west mouth of Sixianjiao Navigation Channel, low “lock-dams” are built in the branch to confine the hydrodynamics so as to get rid of the “risk”. At the same time, the flow overflows the dams and scours the bed materials so that the problem of “shallow” can be relaxed. After the improvement, the depth of the overall waterway increases from less than 2.0 m to larger than 2.5m. Ships over one thousand tons can then pass through the navigation channel and favorite conditions are then developed for flood disposal and drainage. Remarkable economic and social benefits are got.
Keywords： the Pearl River navigation channel shoal improvement (waterway regulation)
Comparative Analysis on World Natural Heritage Value of South China Karst
Xiong Kangning,Xiao Shizhen,Liu Ziqi,Chen Pindong
Strategic Study of CAE 2008, Volume 10, Issue 4, Pages 17-28
Karst constitutes one of the greatest landscape styles of the world and China is one of the places where its finest expressions can be seen. From the point of view of karst features and evolutional histories, and by comparative analysis on the three sites with worldwide similar karst areas under the eighth criterion of world heritage, the outstanding universal value is uncovered: Shilin stone forest in Yunnan is the most complicated in the evolution history richest in the forms,which represents a unique evolvement mechanism of stone forest development;which possesses not only the most typical karst cones, but also the most complex assemblages of the cone karst. Libo cone karst represents typical factors of cone karst landforms reflects geological evolvement models and processes in the tropical-subtropical continent; Wulong gorge karst shows integrally development and evolution system of the gorge karst, records evolutional forms of different phases of gorge karst, such as karst gorges, underground rivers, natural bridges, collapse dolines, caves and so on, and illustrats on-going evolution process on the neotectonic movement. As a result, south China karst (Phase 1) world heritage sites represent a long-term, multi-phased evolution history in south China since Paleozoic; the landform features of tropical-subtropical typical cone karst, stone forest karst and gorge karst; the development and evolution mechanism and on-going geological process of tropical-subtropical cone karst, stone forest karst and gorge karst landforms; and unique physical geography characters of the largest in the three vast karst areas in the world.
Keywords： world heritage comparative analysis south China karst
Thoughts on shale gas exploration in southern China
Guo Xusheng,Guo Tonglou,Wei Zhihong,Zhang Hanrong,Liu Ruobing,Liu Zhili,Wang Wei
Strategic Study of CAE 2012, Volume 14, Issue 6, Pages 101-105
There are extensively three sets of marine regional organic-rich shale stones in southern China as lower Cambrian, lower Silurian and upper Permian and also continental organicrich shale stones in Sichuan Basin, Jianghan Basin and Subei Basin, possessing geological conditions to creating shale gas. Meanwhile, comparing with those in U.S., the shale gas in southern China is featured by multiple superimposition and reforms by structural movements, high Ro, complicated preserving conditions while the TOC and porosity of continental shale stones are relatively lower. Therefore, many challenges are faced for shale gas explorations in southern China and blind optimism should be avoided. The authors consider that the marine and continental shale stones are the realistic fields to realize shale gas exploration and development with large scales and the continental shale stones in Jianghan Basin, Subei Basin can be taken as the mothball field for shale gas exploration in southern China.
Keywords： southern China shale gas exploration evaluations
The optimum drilling technique in the northeast area of Sichuan
Han Laiju,Ma Guangjun,Zhao Jinhai
Strategic Study of CAE 2010, Volume 12, Issue 10, Pages 44-49
Geological conditions in northeast area of Sichuan are complicated, such as poor drillability in terrestrial formation, severe deviation in high angle structural belt. Pressure system and strata lithology in this area is also complicated, which causes many complex cases and accidents like lost circulation and collapse when drilling. Besides these, this area have "high pressure, high production, high sourness" features. ROP was slow and drilling cycle was long. In order to increase ROP of complicated deepwell in south China, through introducing and developing new technology and new tools, like gas drilling and vertical drilling equipments, combined with existing techniques such as underbalanced drilling, compound drilling, optimum drilling technique system fit for complicated deepwell in northeast area of Sichuan was formed, which improved ROP and wellbore quality of complicated deepwell in south China.
Keywords： northeast area of Sichuan optimum drilling gas drilling vertical drilling MPD with lower-density drilling fluid bit optimization compound drilling
Caihong Huang, Beidou Xi, Zhurui Tang, Wenchao Yuan
Strategic Study of CAE 2018, Volume 20, Issue 5, Pages 52-56 doi: 10.15302/J-SSCAE-2018.05.008
With the rapid development of Chinese economy, a large number of pollutants have entered the environment of agricultural producing areas and gradually exceeded its capacity limits, leading to substantial environmental problems and pollution incidents, as well as decline in output and quality of agricultural products, which has seriously impacts on the sustainable development of China’s agricultural production and rural economy. Urbanization in Southern China started early and developed rapidly, initially at the expense of the environment. Consequently, the problem of heavy metal pollution of soil becomes prominent and is aggravated by the widespread acid rain pollution in Southern China. This paper focuses on main agricultural producing areas along the Yangtze River and systematically discusses quality conditions of various environmental elements such as water, soil, and air. In addition, it investigates the causes of pollution from the aspects of natural factors and influences of human activities, and ultimately provides prevention and control strategies for the pollution, which can be of great significance in promoting the scientific nature of environmental pollution control in the agricultural producing areas in Southern China, ensuring agricultural sustainable development, quality safety of agricultural products, and ecological environment safety, and guaranteeing people’s health and safety.
Keywords： agricultural producing areas in Southern China environmental pollution prevention and control strategies
Shen Chen
Strategic Study of CAE 2010, Volume 12, Issue 10, Pages 29-34
High H2S and CO2 content, complicated geological condition and field environment brings so many world-classic problems to the exploration and development engineering in Northeast Sichuan gas field. By introduction, research and practice, serial techniques such as drilling, gas test, and completion workover, etc., for the ultra deep and highly acidic gas field were gradually formed. Therefore Puguang Gas Field, for the first time, such reservoir is safely developed in China. This paper introduced these techniques briefly to provide reference for domestic similar gas fields and give many proposals to expand the exploration and development engineering techniques of ultra deep and highly acidic gas field.
Keywords： Northeast Sichuan ultra-deep well high sulfur exploration and development drilling completion
Sustainable Development of Food Security in Northeast China
Tang Liang, Wu Dongli, Miao Wei, Pu Hongxia, Jiang Linlin, Wang Shaobin, Zhong Wentian, Chen Wenfu
Strategic Study of CAE 2019, Volume 21, Issue 5, Pages 19-27 doi: 10.15302/J-SSCAE-2019.05.016
Grain is a commodity of strategic significance. The general self-sufficiency of cereal grains is vital to people's livelihood and national security of China, a country with a population approaching 1.4 billion. Northeast China is endowed with the most abundant agricultural resources in China. Its grain industry is growing faster than any other part of China; it has the greatest potentials for development, and makes the maximum contribution to national food security. Northeast China is now an important commodity grain and livestock production base. In this paper, the food security situation in this region is elaborated against the backdrop of internationalization and greenization, the trend of food supply and demand in this region is analyzed, problems concerning food security are classified, and strategic suggestions are proposed, including accelerating the supply-side structural reform for agriculture, promoting the combination of agriculture and animal husbandry, and developing benefit-oriented agriculture. This study is hoped to provide a reference for implementation of decisions involving regional food security and sustainable development.
Keywords： Northeast China food security sustainable development
Cui Hui,Wu Changchun,Wu Jianglin,Sun Qingfeng
Strategic Study of CAE 2004, Volume 6, Issue 8, Pages 69-73
The northeastern oil pipeline network is the largest regional oil pipeline system in China. As for its operational actuality on the basis of the peak - valley price, the optimization of the daily operation scheme is presented. Virtually, the advantage of the valley price is used to increase the oil throughput rate in the valley period, and accordingly the daily energy consumption cost is lowered. Aiming at the problem the linear programming mathematic model is formulated in this paper. By means of this method, the analysis is carried out for Tieling-Qinhuangdao hot oil pipeline under different daily throughput rates. Some fundamental rules for the optimization of the daily operation scheme based on the peak-valley price are found from the computed results. At the same time, it is shown that the optimal scheme will reduce energy cost of the network to some extent. However, this method is subject to the operational characteristics of the pipeline to some degree. Thus, it is more applicable to the isothermal pipeline than the hot oil pipeline.
Keywords： northeastern oil pipeline network peak-valley price daily operation optimization
Environmental and Dynamic Conditions for the Occurrence of Persistent Haze Events in North China
Yihui Ding,Ping Wu,Yanju Liu,Yafang Song
Engineering 2017, Volume 3, Issue 2, Pages 266-271 doi: 10.1016/J.ENG.2017.01.009
This paper presents a concise summary of recent studies on the long-term variations of haze in North China and on the environmental and dynamic conditions for severe persistent haze events. Results indicate that haze days have an obviously rising trend over the past 50 years in North China. The occurrence frequency of persistent haze events has a similar rising trend due to the continuous rise of winter temperatures, decrease of surface wind speeds, and aggravation of atmospheric stability. In North China, when severe persistent haze events occur, anomalous southwesterly winds prevail in the lower troposphere, providing sufficient moisture for the formation of haze. Moreover, North China is mainly controlled by a deep downdraft in the mid-lower troposphere, which contributes to reducing the thickness of the planetary boundary layer, obviously reducing the atmospheric capacity for pollutants. This atmospheric circulation and sinking motion provide favorable conditions for the formation and maintenance of haze in North China.
Keywords： North China Persistent haze events Environmental conditions Dynamic conditions
An incremental software architecture recovery technique driven by code changes Research Article
Li WANG, Xianglong KONG, Jiahui WANG, Bixin LI,wangli1218@seu.edu.cn,xlkong@seu.edu.cn,18262609320@163.com,bx.li@seu.edu.cn
Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 5, Pages 664-677 doi: 10.1631/FITEE.2100461
Keywords： Architecture recovery Software evolution Code change
Title Author Date Type Operation
Water Resource Effectiveness of Vegetation Conservation and Restoration in North China
Sun Siqi,Chen Yongzhe,Wang Cong,Hu Qingfang,Lyu Yihe
Journal Article
Study on Fluvial Process and Regulations of Typical Shoal of Middle Yangtze River
Lu Yongjun,Liu Jianmin
Journal Article
Strategic Concern to Land and Water Resources Allocation， Ecology and Environment Protection and Sustainable Development of Northeast China
“Water Resources in Northeast China” Project Group,CAE
Journal Article
Experimental Research on Improvement of Navigation Channels in the Confluence Zone of the West and the North Rivers
Ao Daguang,Zeng Zhicheng,Li Bo,Che Jinzhou
Journal Article
Comparative Analysis on World Natural Heritage Value of South China Karst
Xiong Kangning,Xiao Shizhen,Liu Ziqi,Chen Pindong
Journal Article
Thoughts on shale gas exploration in southern China
Guo Xusheng,Guo Tonglou,Wei Zhihong,Zhang Hanrong,Liu Ruobing,Liu Zhili,Wang Wei
Journal Article
The optimum drilling technique in the northeast area of Sichuan
Han Laiju,Ma Guangjun,Zhao Jinhai
Journal Article
Causes and Control Strategies for Environmental Problems of Agricultural Producing Areas in Southern China
Caihong Huang, Beidou Xi, Zhurui Tang, Wenchao Yuan
Journal Article
The exploration and development engineering technology for ultra deep and high acid gas field in Northeast Sichuan
Shen Chen
Journal Article
Sustainable Development of Food Security in Northeast China
Tang Liang, Wu Dongli, Miao Wei, Pu Hongxia, Jiang Linlin, Wang Shaobin, Zhong Wentian, Chen Wenfu
Journal Article
Study of the Optimal Scheme for the Daily Operation of Northeastern Oil Pipeline Network Based on the Peak-valley Price
Cui Hui,Wu Changchun,Wu Jianglin,Sun Qingfeng
Journal Article
Environmental and Dynamic Conditions for the Occurrence of Persistent Haze Events in North China
Yihui Ding,Ping Wu,Yanju Liu,Yafang Song
Journal Article
Francis Zvomuya: Restoring Degraded Soil Fertility and Improving Crop Productivity: Canadian Experience and Practices (2019.8.22）
23 Apr 2021
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