共查询到19条相似文献，搜索用时 93 毫秒
1.
四川省水土资源开发利用现状特征、问题及可持续利用对策 总被引：2，自引：0，他引：2
系统分析评价研究了2004年四川水土资源开发利用现状特征及其存在的主要问题，针对四川人地矛盾日趋尖锐、水土流失严重、水资源利用率低、水资源污染仍较严重尤其饮用水源地水质堪忧等制约全省经济社会可持续发展的重要因素，提出了实现四川水土资源可持续利用的对策和措施。 相似文献
2.
一、资源利用不合理。资源效率低下绥化市用水不合理、用水效益底下的现象比较普遍。农业用水约占用水总量的84％,但目前农业用水效率低下,水资源浪费严重。一方面输水过程中由于蒸发、渗漏等原因水分损失较多,灌溉方式也比较落后, 相似文献
3.
邢旭东 《国土资源导刊(湖南)》2002,21(3):168-172
在分析论述了湖南省土地资源的特点与利用条件和湖南省当前土地利用中存在着耕地数量减少,耕地后备资源不足、人地矛盾突出、土地利用结构与布局不合理、土地利用效益低下、土地质量下降等问题及其主要原因的基础上,提出了湖南省土地资源可持续利用的对策.主要包括合理开发利用和保护耕地资源,加强土地资产化管理,提高土地资源利用效率,因土制宜,合理布局和使用农用土地,加强土地生态建设,提高土地质量,健全和完善土地法规和政策等. 相似文献
4.
文章分析了区域经济系统产业结构升级与用地结构变迁的关系，尤其是“十五”期间我国产业结构的进一步升级，将在一定程度上进一步带动农业用地的非农化，同时还可能会造成土地污染问题。据此作者认为我国产业经济的可持续发展必须以土地资源可持续利用为基础、并提出了推进我国可持续发展经济战略实施的土地资源可持续利用政策体系。 相似文献
5.
一、可持续发展与耕地可持续利用耕地资源的可持续利用是在尽量保持耕地总量的动态平衡下,对耕地进行深度开发要以科学技术为手段,以现代工业为支撑,以市场为导向,把传统农业转变到以现代科学技术为基础的现代农业上来,通过建立现代化的农业生产技术体系,大幅度提高耕地利用率、劳动生产率和产品商品率。 相似文献
6.
山东省水资源不足,且分布不均,对经济和生态环境已产生严重影响。南水北调工程是缓解山东水资源紧缺,维持山东水资源可持续利用的根本性措施。建议调整一期一步工程路线,并合理解决污染、南四湖东平湖调蓄、胶东应急工程及资金问题。 相似文献
7.
8.
9.
采用国际上前沿的虚拟水理论,运用联合国粮农组织(FAO)推荐的CLIMWAT 2.0和CROPWAT 8.0软件,对济南市农业作物虚拟水含量进行计算,得出了2009—2014年济南市农业产品虚拟水总量;通过查阅、分析济南市2009—2014年水资源公报,计算出济南市2009—2014年林牧渔畜产品、工业产品、生态环境用水、城镇公共用水及生活用水的虚拟水总量;通过对济南市各产业虚拟水数据研究分析,得出了各产业虚拟水变化趋势及其原因;根据虚拟水理论,并与济南市水资源总量对比计算,得出济南市水资源匮乏指数,经研究得出济南市水资源可持续开发利用仍将面临严峻挑战的结论,并针对济南市水资源利用现状的严峻情况,提出了通过减少济南市虚拟水总量、增加水资源总量或节省水资源消耗达到降低水资源需求压力的目的,从而为济南市水资源可持续开发、利用提供参考及新思路。 相似文献
10.
陈士银 《广东海洋大学学报》2001,21(3):54-59
从可持续发展的角度,分析了广东省徐闻县土地资源利用的现状和耕地锐减的原因,并有针对性的提出了通过建立土地资源可持续利用机制和采用行政、经济、法律及技术等措施来保护耕地,实现土地资源的可持续利用. 相似文献
11.
归纳了四川省治理干旱的４种方法：工程治水、生态治水、环境治水和农业治水,并对其进行了评价分析。最后,提出了治水的综合建议。 相似文献
12.
TheagriculturalregionofSichuanBasinislocatedintheeastofSichuanProvince.TheChangjiang(YangtZe)caver,traversingeastandwest,itsbantributariesincludingtheMinjiang,Tuojiang,Jialing,FujiangandQujiangrivers,likefivefingerstoextendtowardsthenorth,disunitedthebasinintoplainsandhills,surroundedbylowandmiddlemountains,theterraindropsrapidlyfromtheexteriortointerior.Thus,asinglephysicalgeographicalunitismadeup.Withthelong-termdeve1Opment,acharacteristicagriculturalregionappealSundertheconditionofric… 相似文献
13.
四川省是中国传统的人口与农业大省,城市化发展的任务尤其艰巨.四川省城市化水平与全国水平相比差距很大,且发展极不平衡,这已成为严重制约经济发展的瓶颈.利用修正的Logistic模型,从城乡人口数量方面对四川省城市化的发展趋势进行了研究. 相似文献
14.
Currently, the agricultural growth in developed countries mainly relies on the improvement of productivity, which is also the target for China. Accordingly, the purpose of this study was to describe the spatial-temporal evolution pattern of agricultural productivity, to reveal changes in total factor productivity in 2000–2010, and analyze the impact of these changes in northwestern Sichuan plateau, China. Using data envelopment analysis (DEA) and the Malmquist Index, an in-depth study was conducted on agricultural productivity and changes in total factor productivity of 31 counties in northwestern Sichuan plateau. Results indicated that: (1) geographically, counties with optimal efficiency were mainly located in the north of northwestern Sichuan plateau and those with the lowest efficiency, in the south; (2) relative to pure technical efficiency, scale efficiency was the dominant factor in determining agricultural productivity; (3) the redundancy rate of input factors in 2010 was slightly lower than that in 2000, thereby indicating an improved utilization of input factors to a certain extent and a great potential for further improving such utilization; (4) during the 2000–2010 period, the agricultural total factor productivity had an average annual growth rate of 8.3%, but the growth rates in various regions differed widely; (5) technical progress was the dominant factor promoting the improvement of total factor productivity in agriculture. The disparities in spatial distribution may be due to the differences of natural conditions, former level agricultural productivity between counties. The findings are valuable for the government to make sustainable development policies for agriculture and improving agricultural development in northwestern Sichuan plateau. 相似文献
15.
立足于发展现代农业的大前提,结合四川的实际情况将四川的农业物流与电子商务相结合,着重分析了四川农业的现状及四川农业现代化的发展条件,指出了其存在的问题,通过总结各省市的先进实践经验,得到了相应的解决办法.对发展与四川经济发展水平相适应的现代农业,解决目前农村经济发展滞后问题,有一定的参考意义. 相似文献
16.
立足于四川省宣汉县拱桥河流域4.3 km2的柏树河村,在小区观测的基础上,提出了5种低山丘陵区土壤侵蚀生态治理模式。根据小流域生态系统的特点,应用多目标优化理论,按不同的治理模式进行了生态工程治理分区,治理措施达到了优化配置,从而使小流域既成为一个水土保持防护体系单元,又成为发展商品生产基地的经济单元,创造人与自然和谐相处的生态环境,为南方丘陵地区小流域提出了一套合理的生态工程治理模式。 相似文献
17.
APPLYING PPE MODEL BASED ON RAGA TO CLASSIFY AND EVALUATE SOIL GRADE 总被引：14，自引：0，他引：14
The research of soil classification and soil grade evaluation is often based on fuzzy theory .So ,the tradition-al method has an inevitable problem about weight matrix which given by some experts ,and the final result can be influ-enced by artificial factors.The essentials of fuzzy synthetically judge is to handle the data of high dimension.That is to reducing the dimension number.The weight matrix in fuzzy theory is corresponding to low dimension projection value of each index.But we canˊt define whether the weight matrix given by experts is the best projection value or not.So,the authors apply a new technique of falling dimension named projection pursuit to soil study,through using the improved re-al coding based accelerating genetic algorithm to optimize the projection direction.Thus,it can transfer multi-dimension data into one dimension data,through searching for the optimum projection direction to realize the soil classification and its grade evaluation.The method can avoid the artificial disturbance,and acquire preferably effect.Thus,the paper pro-vides a new method to the research of soil classification and grade evaluation. 相似文献
18.
19.
TU Jianjun DENG Yulin 《山地科学学报》2005,2(3):244-254
Introduction Western China is vast in area with different landforms and ecosystems, and its environment is deteriorated with different agricultural productivities. The northwestern region is very drought for lack of rainfall, and desertification there is serious with difficulty in vegetation restoration, while in the southwestern region the land is fragile, vegetation is degraded and water and soil loss serious. Even worse, for the lack of effective management, new environmental problems deriv… 相似文献