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geomorphic characters
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  地貌特征
    The Influence of Geomorphic Characters on Agricultural Sustainable Development in Gansu
    甘肃省地貌特征对农业可持续发展的影响
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  geomorphic characters
The town of Zacapoaxtla was one of the sectors most affected by slope instability due to the existing geological features and geomorphic characters determined by material properties, landforms and processes.
      


From the view of the soil erosion,the basic geomorphic characters in Fujian Province are analysed.The effectsof the characters the rain erosivity,soil erosion modulus and soil erosion forms have been discussed.The prohibited25 slope has also been discussed.Finally,the paper concerns the characters of soil erosion under variouslandscapes land it is pointed that small basin hills with the black mica(r ̄5)and purple shale(k2ch)and high densitypopulation are weak ecological zone and severe soil...

From the view of the soil erosion,the basic geomorphic characters in Fujian Province are analysed.The effectsof the characters the rain erosivity,soil erosion modulus and soil erosion forms have been discussed.The prohibited25 slope has also been discussed.Finally,the paper concerns the characters of soil erosion under variouslandscapes land it is pointed that small basin hills with the black mica(r ̄5)and purple shale(k2ch)and high densitypopulation are weak ecological zone and severe soil erosion in the province.

该文分析了福建省地貌的基本特征,及对土壤侵蚀动力、侵蚀强度和方式的影响,并对25°禁垦坡度进行了讨论。同时还对不同地貌类型的土壤侵蚀特征进行了分析,指出:人口密集的黑云母花岗岩和紫色页岩盆谷丘陵区是生态系统脆弱区域,是福建省土壤侵蚀的重点区。

Land desertification is one of the serious problems to environment and economy in the world. Because of geographical condition,it′s difficult to get information of land desertification in mountainous regions. To gain the information related to monitoring and evaluating Land desertification from remote sensing image is the key of application and developing of remote sensing technology to prevention of land desertification. Principal component analysis to Landsat TM image data(except TM6),the first principal component...

Land desertification is one of the serious problems to environment and economy in the world. Because of geographical condition,it′s difficult to get information of land desertification in mountainous regions. To gain the information related to monitoring and evaluating Land desertification from remote sensing image is the key of application and developing of remote sensing technology to prevention of land desertification. Principal component analysis to Landsat TM image data(except TM6),the first principal component indicates geomorphic character,and the second principal component (also called green index)indicates the regetation cover feature.Spatial fileer to the first principal component,gully image is got and gully criteria for evaluation land desertification are given. Combining the results of computer_assisted classification of multispectral data with the second principal component,the ralation between land types,lond desertification degree and green index is know. Classification image,gully image and green index image form a set of image for evaluating land desertificaeion. It′s feasible to apply remote sensing to the evaluation of land desertification in mountainous regions.

通过遥感数字图象统计分析与处理,确定了分类图、沟谷图、绿度指数图是评价山区土地荒漠化的有效图象,进行了沟谷指标、绿度指数分级,肯定了遥感技术应用于山区土地荒漠化评价的可能性。

In this paper,the direct and indirect effects of geomorphic characters in Gansu on agricultural production are analysed,the relation between geomorphology and natural hazard such as soil erosion are discussed and the important reasons of the weak agricultural ecological environment are pointed out,which are steep slope,heavy rainfall,thin vegetation,soft surface sediment and strong wind.The weak ecological environment is getting bad in view of unrational human activity.According to the geomorphic...

In this paper,the direct and indirect effects of geomorphic characters in Gansu on agricultural production are analysed,the relation between geomorphology and natural hazard such as soil erosion are discussed and the important reasons of the weak agricultural ecological environment are pointed out,which are steep slope,heavy rainfall,thin vegetation,soft surface sediment and strong wind.The weak ecological environment is getting bad in view of unrational human activity.According to the geomorphic distribution,it is suggested that the countermeasures to improve the agricultural ecological environment in Gansu are to establish a green shelter system and to promote intensive farming in the whole province.

在分析甘肃省的地貌特征及其对农业生产的影响的基础上,论述了地貌与土壤侵蚀的关系,并指出坡度大、降水强度大、植被稀疏、地表物质疏松和大风是造成农业生态环境脆弱的主要原因,而人类活动的不合理则使本已脆弱的生态环境更趋恶化.最后,根据甘肃省的地貌格局,提出促进农业生态环境良性发展的根本措施:因地制宜发展与当地生态环境相适应的绿色产业,以确保农业生态环境良性发展;提高农业生产的集约化水平.

 
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