Abstract:Based on the analysis of industrial developments on Chinese red dates,wild pepper and apple in the canyon areas of the Yellow River and the Northern Terrace Plateau of the Wei River.the author regards that the arrangement of soil well and water conservation measures must be suited to local conditions the economic benefits must he stressed as as the benefits of soil and water conservation must be resided in economic benefits .if consider these in the practices the wealthy conditions for local farmers will be resulted shortly and the rapidity of harness of soil and water losses in the these areas will be accelerated at the same time.

Abstract:The conliguous area of Shanxi,Shaanxi and Nei menggu is located in the connect zone of the Loess Plateau and desert. It is a typically ecological transition zone and ecocritical zone, and this area is also the aboundant zone of natural resources. The contradictory between the resources and enviroment is obvious. moreover，the coalfield has been mined in recent years, the deterioration of ecoenvironment has been further aggravated. Based on analysing characteristics of ecologic environment systematically，the suggestion of environment renovation has been proposed. The article has indicated that it is significant to do the research about ecoenvironment evolution and renovation technology in this area.

Abstract:On basis of delegate's speeches and discussions at symposium for Erosion Emvironment Regulation and Control and Agriculture sustained development on loess plateau,it is summarized that A certain number of arguments of soil erosion and dryland farming research，included erosion environment connotation and its research subjects of macroscopic and microscopic regulation and control;soil and water conservation validity for reducing sediment of Yellow River:analysing on natural erosion and man-made accelerated erosion :relationship preventing for soil erosion and increasing productivity of dryland farming;dryland farming under market economy and analysing on vegation restoration and construction probability.

Abstract:Casium137 was uused to study soil erosion and sediment delivery on old sloping fields in Nan Xiao He gully of zst Gan Su on loess plateau in this papery. A quantitative analysis was made to test the soil erosion and sediment deivery. The results shown that the amount of erosion was high but delivery ratio in the slope was low. That is to say,the sediment that really lost from the land was less,so there was large amount deposition in old sloping fields. The soil loss can be reduced by constructing terrances. To compare terrance with the sloping fields,there is 96.5% benefit of reducing sediment.

Abstract:With the help of comparison between watersheds,we analysed quantitatively the main element of water balance:distribution among rainfall,evapotraspiration,interception and volume of runoff，the quantitative relationship among the elements and the affect by forest condition;hence we worked out a list of water balance. The result is : the rainfall to the water and soil prevension forest is chiefly distributed in evapotraspiration,interception of the tree crowns and on a small quantity of surface rainfall. Also we have this result;in order to make full use of the function of water prevension of westnorth in Shanxi,we must adopt kinds of methods to prevent the evaporation loss of water in the water and soil prevension forest,and make more water stored in soil. At the same time we offered the theoretical basis for planting and renewing the water and soil prevension forest.

Abstract:The present situation,harms and fundamental cause of cultivated land soil and water loss for our country analysed in this paper.Then,the technical measures of contralon Cultivated Land soil and water loss were put forward.

Abstract:This paper discussed the definition of desertification and the harm of desertification in China,and a great deal of studing work have been carried out on the monitoring of desertification processing,the stability of biological measures. the comprehensive benifit of desertification control,the afforestation technology on desertification land and the technical way combating the desertification. Several suggestions have been proposed for the future.

Abstract:The basic problems in mountainous regions are thought as odious condition of nature and economy，unrational structure of production,little input to science,technology and education,too much population to burden but with poor personal quality ,the severe reality could not permit the harness of small watershed to run on the way of high input and output. On thinking the special conditions of China the harness of the small watershed should exploit and utilize the potentialities fully of natural resource,man-power,necessaries.input,science and technology as well as the potential productivity of some resource based on the persistence of equitability,sustainability,harmony,requirment,high efficiency and periodic leaping to get the sustainable,stable and coodinating evelopment of small watershed.meanwhile.in the process to obtain shortterm benefit the longterm interest of future generations could not be infringed.

Abstract:Auct of "Four kinds of barrens"in shanxi provice started in 1983. It has reached high tide since 1992，About 1. 5 million mu had auctioned off from 1983 to may of 1993. The auction has furtherly perfected and intensified the soil and water conservation system of job responsibility which put contracting small valley control to house hold first.It is also a great refermation of noncultivated land use system in the region of soil and water loss;basie prerequestite promoting economy of small valley into market economy，a great change of production relationships in hilly mountain areas，and important act to advance productive forces in the areas. The main procedure for the auction are: to give wide publicity， go deep into starting，establish organization，strengthen leadship. unify plannirg, limit scope.evaluate rationally，decide selling price. prnouce publication，compete to enter bid，sign a contract，manage aceording to law.There are following advantages and characteristics for the auction of "Four kinds of barrens". It has come true that proprielary rights are separated from the rights of use，It is easy of restrain and manage for oneself,to speed up the rate of developement and control of soil and water loss region. It is easy to develope and control scientifically and highly qualitive，and to improve economic benefits, It has established reliable foundation to give up poor and to step on rich.

Abstract:The physical geography river the Fribulary of La Sa condition and hydrological characteristics of central seeting valley area of Ya Lu Zangbu river and Nian Chu river have been discussed in this paper. A great deal of data has been provided for developing soil and water conservation works.

Abstract:A watersaving and automatic rootwashing Installation is introduced in this article.Comparative experiments show:it is both reliable and efficient ,and saving water,high automatic,portable.operated easly.and it needn't special necessary equipment yet .and materials can be got early and its cost is very cheap. It may be used avidly as a commen installation in the research of root system.