坡地梯田化

来源 :黄河建设 | 被引量 : 0次 | 上传用户:GGGFFFAA1
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
(一) 只有在極端需要控制逕流并迅速制止水土流失的地方,才采用梯田的措施,梯田有下列各种不同的形式: 台階梯田它的作用在于:減緩坡地的坡度、减少逕流、制止土壤侵蝕、并改善土壤的耕作条件和梯田中農作物的生長条件。 帶地埂的蓄水溝 以攔蓄地表逕流的方法来与土 (I) Terraced fields are used only in places where extreme runoff control is necessary and soil and water loss are quickly stopped. Terraced fields have the following different forms: Terraced terraces. Its role is to: reduce the slope of the slope, reduce runoff, and prevent soil erosion , And improve the soil farming conditions and the growth conditions of the crops in the terraced fields. Gully creek with land to intercept surface runoff methods and soil
其他文献
中国石化重庆一坪高级润滑油公司生产的燃气汽车发动机润滑油,是采用深度精制的基础油,并加入高效专用添加剂复配而制成,符合企业标准Q/SH YP02.03—1999要求。按粘度等级分
说心里话,以前我怎么都不会想到,自己会站在哈佛的讲台上,在这里,我只想说,我是托了京剧的福,而京剧也是托了你们的福。无论你们懂不懂戏,至少今天你们走进讲堂,就是有意愿去
The behavior of antimony oxidation in the solution of sodium thioantimonite was studied in the presence of catalytic agents. The catalytic effects of the respec
期刊
A blending chelate filter membrane with high chelate capacity for Ag + has been prepared by blending of phosphoramidic acid resin and polysulfone. The major pa
期刊
讨论了无铅汽油的组成及其对灭火效果的影响,介绍了不同种类抗溶灭火剂的性能和选用。 The composition of unleaded gasoline and its effect on fire extinguishing effec
方法 针对胡状集-庆祖集油田具体情况,开展下4英寸套管工艺技术研究。目的解决胡状集-庆祖集油田开采中暴露的问题:一是套管腐蚀加剧,破坏了注采并网;二是油水井射孔井段长,层间矛盾
The stereoselective synthesis of (2R, 4R)-2-N-tert-butyloxycarbonyl amino-4, 5-epoxido- valeric acid methyl ester 8, which is the key intermediate for the synth
中国化学会第 1 1届有机分析和生物分析学术研讨会于 2 0 0 1年 1 1月 2 6日至 30日在福州举行 ,来自全国 2 1个省、市、自治区的 1 2 0余名代表参加了会议。会议共收到论文
Structure, magnetic properties and magnetostriction of Sm0.9Pr0.1(Fe1-xCox)2 compounds have been investigated by means of X-ray diffraction, a.c. initial suscep
我们满怀胜利的喜悦送走1999年,迎接2000年———千禧年的到来。值此辞旧迎新之际,利用《石油企业管理》杂志提供的宝贵机会,请允许我代表中油塔里木油田分公司全体员工向全国各族人民祝