钟山奇石

地处桂东地区的钟山县，是思勤江的发源地，其源头主要有两大支流：一是红花河，二是花山，二的发源地海拔在1372-1528米之间，均属花岗岩地带。区内高山林立，山岭连绵，林木繁茂，雨水四季充裕，溪流纵横，峰沟落差较大，高落差和水势分流汇聚的切割、侵蚀作用为造就奇石资源提供了良好的条件。     

金沙江干热河谷元谋强侵蚀区土壤裂隙形成与侵蚀机制

根据金沙江干热河谷元谋地区红土层非常发育的裂隙现象,对该地区典型区土壤裂隙形成的环境和土壤剖面进行了调查,并采样进行相关土壤理化性质测定、粘土矿物X-射线衍射分析以及土壤微形态研究。结果表明:(1)该区旱季丰富的土壤裂隙形成与该区主要分布的第四系古红土层(QS)和第四系元谋组的黄棕色土层(QY)等红土母质特性有密切关系;(2)由于土壤裂隙非常发育,成为了边坡崩塌和直接产生重力侵蚀的成因,加剧了土壤侵蚀过程,导致了土柱和土林等强侵蚀景观形成。研究表明,土壤裂隙是金沙江干热河谷元谋地区强烈侵蚀和水土流失所特有的成因。     

河岸边坡的维护措施

我省境内河流纵横,水系发达,这些河流在为我们的生活提供着丰富的水资源的同时,由于对岸坡的侵蚀作用雨严重的蚕食着土地,以致每年造成的国土流失现象十分严重。     

大巴山泥石流侵蚀作用及防治对策研究

通过对大巴山泥石流形成和发育过程的研究，从侵蚀机制的角度，将其分为坡面侵蚀，沟谷侵蚀，复合侵蚀三种基本的侵蚀类型，并进一步分析了不同影响因素在各类泥石流发育中所起的作用，认为：坡面侵蚀型泥石流的发育与植被关系最密切；沟谷侵蚀型泥石流的发育对暴雨的依赖性最大；复合侵蚀型泥石流的发育与沟岸的不稳定有很大关系。最后，针对性地提出了大巴山区各类泥石流的防治重点。     

金沙江干热河谷元谋强侵蚀区土壤裂隙形成与侵蚀机制

根据金沙江干热河谷元谋地区红土层非常发育的裂隙现象,对该地区典型区土壤裂隙形成的环境和土壤剖面进行了调查,并采样进行相关土壤理化性质测定、粘土矿物X-射线衍射分析以及土壤微形态研究。结果表明：（1）该区旱季丰富的土壤裂隙形成与该区主要分布的第四系古红土层（Qs）和第四系元谋组的黄棕色土层（Qv）等红土母质特性有密切关系;（2）由于土壤裂隙非常发育,成为了边坡崩塌和直接产生重力侵蚀的成因,加剧了土壤侵蚀过程,导致了土柱和土林等强侵蚀景观形成。研究表明,土壤裂隙是金沙江干热河谷元谋地区强烈侵蚀和水土流失所特有的成因。     

我国西南地区土地荒漠化及其防治对策

概述了我国西南地区土地荒漠化的现状,表现形式,并从自然和社会经济等方面分析了该区土地荒漠化形成的原因,提出了土地荒漠化防治对策。     

欢迎订阅2006年《新农业》杂志

由于多种小利自然因素的侵蚀作用，涂料受自然环境的影响要比一般装饰材料所受到的影响更明显。所以，面对目前市场上100多个品种的涂料，在选购时遵循下列原则，     

Soil surface roughness change and its effect on runoff and erosion on the Loess Plateau of China

As an important parameter in the soil erosion model, soil surface roughness（SSR） is used to quantitatively describe the micro-relief on agricultural land. SSR has been extensively studied both experimentally and theoretically; however, no studies have focused on understanding SSR on the Loess Plateau of China. This study investigated changes in SSR for three different tillage practices on the Loess Plateau of China and the effects of SSR on runoff and erosion yield during simulated rainfall. The tillage practices used were zero tillage（ZT）, shallow hoeing（SH） and contour ploughing（CP）. Two rainfall intensities were applied, and three stages of water erosion processes（splash erosion（I）, sheet erosion（II） and rill erosion（III）） were analyzed for each rainfall intensity. The chain method was used to measure changes in SSR both initially and after each stage of rainfall. A splash board was used to measure the splash erosion at stage I. Runoff and sediment data were collected continuously at 2-min intervals during rainfall erosion stages II and III. We found that SSR of the tilled surfaces ranged from 1.0% to 21.9% under the three tillage practices, and the order of the initial SSR for the three treatments was ZT〈SH〈CP. For the ZT treatment, SSR increased slightly from stage I to III, whereas for the SH and CP treatments, SSR decreased by 44.5% and 61.5% after the three water erosion stages, respectively, and the greatest reduction in SSR occurred in stage I. Regression analysis showed that the changes in SSR with increasing cumulative rainfall could be described by a power function（R2〉0.49） for the ZT, SH and CP treatments. The runoff initiation time was longer in the SH and CP treatments than in the ZT treatment. There were no significant differences in the total runoff yields among the ZT, SH and CP treatments. Sediment loss was significantly smaller（P〈0.05） in the SH and CP treatments than in the ZT treatment.