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辽东山区坡耕地水土流失现状及防治措施 总被引：1，自引：0，他引：1
谢楠 《水土保持应用技术》2013,(6):37-39
坡耕地水土流失的治理和保护是一个热点问题,辽东山区坡耕地水土流失呈不断恶化趋势,侵蚀加剧态势凸显,已成为水土流失的主要策源地,是导致辽东山区生态环境日益恶化,水旱灾害频发的一个重要原因,严重威胁着辽东地区生态安全和人民生活.从辽东山区坡耕地的实际出发,根据自然条件分区概况,对辽东山区坡耕地水土流失现状、水土流失规律进行分析,有针对性的提出防治措施,将坡耕地水土流失防治与保障粮食安全有机融为一体,为辽东山区坡耕地保护提供参考. 相似文献
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滇东北山区坡耕地土壤流失方程研究 总被引：81，自引：11，他引：70
滇东北山区是云南省“长江上游水土保持重点防治工程”治理计划的重点区域,该区域水土流失的主体是坡耕地。该项研究通过对３２个试验小区连续３ａ实测数据的统计分析,建立了滇东北山区坡耕地土壤流失方程Ａ＝Ｒ·Ｋ·ＬＳ·Ｃ·Ｐ;并确定了方程中诸因子的求算方法和数值,以及滇东北山区土壤允许流失量,为方程的应用提供了基本的技术数据。并进行了方程的验证,方程计算值与实测值的误差在６％以下,表明该方程在实际应用中具有 相似文献
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饶河县西部是东北黑土区商品粮基地的重要组成部分,严重的水土流失阻碍了当地经济的可持续发展,为了遏制严重的水土流失,水土保持科研人员在分析当地生态经济现状和水土流失现状及危害的基础上,运用生态经济学和系统工程学原理和方法,研究了饶河县永前小流域水土流失综合治理措施,提出了坡耕地治理措施、沟道治理防护体系、生态修复措施以及村屯道路建设防护体系。 相似文献
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由于三峡生态屏障区内耕地承载力严重不足、生态环境极其脆弱、水土流失十分严重,造成了大范围的农业面源污染问题。为了治理坡耕地水土流失,"十二五"期间重庆市万州区实施了3个坡耕地水土流失综合治理项目。项目的实施提升了耕地数量和质量,提高了农业生产效率,控制了农业面源污染,促进了当地经济发展,为实现区域内经济发展、社会稳定、生态安全提供了有效保障。 相似文献
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赵青 《山西水土保持科技》2005,(4):37-38
吕梁市属干旱半干旱的黄土高原区,梁峁起伏,沟壑纵横,水土流失严重,生态环境十分恶劣.加快水土流失治理,是经济社会持续发展的切入点.实施生态的自然修复,是加快水土流失治理的正确途径.但是,生态修复是一项庞大的、涉及千家万户和子孙后代的系统工程,需认真分析研究.本文在进行全市水土流失治理现状分析的基础上,提出了实施好生态修复的几点建议. 相似文献
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右玉县地处塞外高原，生态环境恶劣。近几年来，结合实施生态移民，积极探索加快治理水土流失的路子，较快地改善了当地的生态环境。其具体作法：一是立足县情，确定生态移民战略；二是创新思路，多形式实施生态移民；三是强化组织领导，加快水土流失治理步伐。 相似文献
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平原地区河道堤防滩地的水土流失,直接淤积河床,影响行洪安全。堤防滩地的水土流失是自然因素和人为因素共同作用的结果,以新修堤防的水土流失最为严重,对其防治须实行工程措施、植物措施和人为预防相结合。 相似文献
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重庆地处长江上游、三峡库区,由于三峡库区水土流失严重、生态环境脆弱、自然灾害频繁,且三峡库区的水土保持和生态建设事关全市经济社会发展全局、事关三峡工程建成后的安全运行和库区的长治久安,因此是我市水土保持生态建设的重点。虽然,“长治”工程的有效实施,使我市的水土保持生态建设取得了较大的成绩,但离全面建设小康社会的要求尚有不少的差距,因此,我们要紧紧抓住国家实施可持续发展战略和西部大开发战略的历史机遇,进一步增强紧迫感、责任感和使命感,调动全社会各界力量,防治水土流失,改善生态环境,建设巴渝秀美山川。 相似文献
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论水土、水土生态与水土生态保持 总被引：4，自引：7，他引：4
在论述水土在陆地生态系统中的地位和作用的基础上,提出了水土生态的概念,认为植被与水土不可分割的整体观念是水土生态的重要特征。同时,对水土生态保持的含义作了新的定义,并将水土生态保持划分为四大类型,即生态型、自然型、生产型、建设型。从水土生态的高度,从源头上、要素的联系中去认识和防治水土流失,是一种主动的、有机的、整体的水土保持观念,是水土保持认识观的深化和发展,将使水土生态保持事业进入一个崭新的时代。 相似文献
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我国滑坡、崩塌的区域特征、成因分析及其防御 总被引：2，自引：0，他引：2
论述了我国滑坡、崩塌的区域分布特征,滑坡和崩塌的危害程度,滑坡和崩塌类型和成因分析,并且提出了灾害的防御措施,以期达到环境保护成为社会发展过程中的一个重要组成部分。 相似文献
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Soils were collected from 2-year (2-y) and 3-year (3-y) old red-pine seedling plots in two tree nurseries, Hayward in the north and Wilson in the southwestern part of Wisconsin State respectively, and equilibrated with 0.01 M Ca(NO3)2 for soil solution Zn and Mn (solu-Zn and Mn), and with 0.01 M Ca(NO3)2+0.005 M EDTA for soil adsorbed Zn and Mn (ad-Zn and Mn). Buffering capacity of soil Zn and Mn (b-Zn and Mn) was obtained from the ratio of ad-Zn and Mn to the solu-Zn and Mn. The concerned traces in pine seedling needles (ndls), stems(sts) and roots (rts) were simultaneously measured. 相似文献
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The charge characteristics of A1 or Ap and B2 horizon samples of total 23 Ultisols, Alfisols and Oxisols in Korea and Thailand were studied by measuring the retention of NH4+ and NO3? at different pH values (4–8) and NH4NO3 concentrations (0.1–0.005 m ). The magnitude of their negative charge (σ?; meq/100g) was dependent on pH and NH4NO3 concentration (C; m ) as represented by a regression equation: log σ?=apH +blogC +c. The values of the coefficient a (0.04–0.226), b (0.03–0.264) and c (–0.676–1.262) were correlated with the kinds of the soil and horizon and with the region where the soil exists. The retention of NO3? was less than 1 and 2–3 meq/100 g for the A1 or Ap and B2 horizon samples, respectively. The sum of exchangeable base and Al (‘effective’ CEC) was close to and higher than the magnitude of permanent charge (=σ? measured at pH = 4.3 and at C = 0.005 m ) for one-third and two-thirds of samples, respectively. A σ? value of 16 meq/100 g clay at pH = 7 and C = 0.01 m was found appropriate to separate the B2 horizons of Thai Ultisols and Oxisols from those of Korean Ultisols and Alfisols. Korean Alfisols and Ultisols and Thai Ultisols were distinguished from each other on the status of exchangeable base and Al 相似文献
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水土保持法律规范和相关行政法律规范,共同构成了水土保持监督管理法律体系,其内容庞杂,相互交叉、融合,程序复杂。通过一组网络图及其简要注释,直观地表述了水土保持监督管理工作的相关程序、时效、逻辑关系和法律依据;通过对网络图呈现的逻辑问题所反映出的法律缺陷进行分析,提出应当按照立法法的有关规定,对现行法律特别是水土保持法律法规进行必要的修改,以适应不断发展的水土保持监督管理工作需要的建议。 相似文献
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简析了婺源县城镇开发区建设过程中造成水土流失的状况、危害、原因后,提出了其防治措施,并阐明开展城市（镇）水土保持的紧迫性。 相似文献
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C. G. Sherrell 《Journal of plant nutrition》2013,36(9):801-816
Abstract Lucerne (Medicago sativa L.) and phalaris (Phalaris aquatica L.) were grown separately and together in a pot trial on a yellow‐brown pumice soil with three rates of sodium (Na) and two rates of potassium (K) in factorial combination. Lucerne alone had a low Na concentration but growing phalaris as a companion grass produced herbage with a Na concentration adequate for stock. Na application increased the Na concentration in phalaris and the mixture of phalaris and lucerne much more than in lucerne alone; had little effect on K concentration; slightly reduced Mg concentration; and greatly reduced Ca concentration but not as much in lucerne as in phalaris or the mixture with lucerne. K application increased K concentration and reduced Na, Ca and Mg concentrations throughout. Yield of phalaris grown alone and in combination with lucerne was increased significantly by Na application when K concentration in the plants was low. Yield of lucerne was not affected by Na application and it is concluded that Na did not substitute for K in this species. It is concluded that field trials are warranted to investigate the possibility of growing a special purpose mixture of lucerne and phalaris on New Zealand yellow‐brown pumice soils to provide feed that has adequate Na for grazing animals. 相似文献