Abstract:Through comprehensive investigation and study on the shrub resource.and its exploitation and utilization in Taishan Mountain and Yimen Mou-mtain it is found hat the shrub resource there had been destroyed great-1y because of the human cut in disorder, openning up wasi;ed land and　aerious grazing,In the last ten years the forests type and structure is ch-anged fundamentally by the practice of complete forbidden mountain and　foresting,and the recovering and protecting of the plant cover under theattention from the governments of various level and the soil and water　conservation departments, Using scientific analysing method the biologi。cal nature and physical characters of the soil in the shrub land are exa-mined based on field investigation, thus pointing the direction and way for the recover and protection, soil and water conservation benefits, the　exploitation and utilization of the shrubs in Shandong province.

Abstract:Through gradual regression analysis to ten kinds nutritions of　soils of 54 counties, Saanxi province, the optimum regression model　for soil nutritions(including alkaline--N, quick action Ps quicick ackac-tion K, B and Zn) has been set up, It shows that soil fertility is the　limit factor of wheat production in Guanzhong plain, but this is not ase in North Shaanxi loess plateau gully hill region, Finally，correlation　analysis and fuzzy cluster on soil nutriments have been done,From above　mentioned, we can get a lot of information about wheat production,soil assessment and nutrition diagnosis

Abstract:There are big differences of soil water among hillslopes with　aspects, In the research field, the soil water is the largest in　slope, the least in the outhslope and the soil water in west　thevaried　north　slope　between them, The average moisture　large切little as the site moves from metersoillayerhilltoptotheoot,varies lies

Abstract:It indicated in this paper the main type, distribution, producti-veness of grazed natural grassland and avenue to improve and use ration-ally it inZhifang Valley, Ansai County, With reclaiming and over stoc-king, natural grassland distributed mainly on steep gully side, making　up 28,8%of the total land area,- and its yield capacity was generally 1.800-2.550 kg/ha (fresh weight)。After closure against grazing for 2}3 years　or interseeding Caragana korshinskii and Sophora viciifolia and so on, the　yield capacity increased 1.9-}-2,1 times and tire rate of low一grade herbage　decreased to 7.9-rll。1%from 40,9-76,9. Authors suggest that combiningestablishment of artificial grassland with transforming crop rotation sys-tem and animal production Could promote agriculture and animal husban- dry in the loess hilly and valley region,

Abstract:Through comprehensive investigation and study on the shrub resource.and its exploitation and utilization in Taishan Mountain and Yimen Mou-mtain it is found hat the shrub resource there had been destroyed great-1y because of the human cut in disorder, openning up wasi;ed land and　aerious grazing,In the last ten years the forests type and structure is ch-anged fundamentally by the practice of complete forbidden mountain and　foresting,and the recovering and protecting of the plant cover under the　attention from the governments of various level and the soil and water　conservation departments, Using scientific analysing method the biologi-。cal nature and physical characters of the soil in the shrub land are exa-mined based on field investigation, thus pointing the direction and way　for the recover and protection, soil and water conservation benefits, the　exploitation and utilization of the shrubs in Shandong province.

Abstract:It analyses the relationship of various types of plant vegetation, the　plant cover, withered matter in forest land with the benefits of water　reservation and sediment reduction,The research method is to observe runoff　and sediment from the typed plots of vegetation, the comparison between　harnessed and contrasted gullies, to determine the amounts of withered　matter on the forest land and water reserved,The results shows that the bene-fit of sediment reduction and water reservation is different from differ-ent vegetation type, It is observed that the benefits in water reservationand sediment reduction of grown-up Caragana korshinskii, six to fifteen-years-growing Roinia pseudoacacia, two to eight-years-growing Astragalus adsurgens,the secondary is the one to six-years-rowing Robinia pseudoaccia and one to five-years一growing alfalfa，the runoff from wasted natural grassland is more than from farmland,reducing the soil loss amount significantly, To the same tree species, the greater the forest cover, the more significant the benefit of sediment reduction,The layer of the withe red matter on forest land has an important effect on the water reserva-tion and sediment reduction-

Abstract:The results in the paper are from statistical analysis of the examination data out of the experiments on 26 runoff plots during the period of 1985 to 1987 year, it clarifies the effects of the rainfall indexes in the gra-nite area of southeastern Fujian on the soil and water lossunderdifferentslope,anddifferent combinations of biological measures with engineer ing, and finds out initially the local rules of soil and water loss，at last itconsiders the biological measures to be the most efficient method to}prevent soil and water loss，the results of which provides reliable basis to conduct effective harness.

Abstract:Jiyuan town, located in the southern foot of Zhongtiaoshan mountain,is one of the stressed regions in soil and water conservation, the harness work taking small watershed as the basic unit has obtained initial results,But due to the economic development, the rapid progress in the mountain road construction, the construction engineering of water conservancy,miing, etc，and the unrational social and economical activity caused new soil and water loss, even grievous in some places, This phenomenon'that when it is harnessed it is damaged and that when one unit harnesses more units damage become the hidden danger, being as the very serious:social problem，which should be noticed in the whole society.It is sugge-}sted that to prevent new soil and water loss it must be made to einforce the propaganda and inspection, enhance the巴co-operation between the de-artments to carry out the comprehensive harness, Only through this way the new soil and water loss could be harnessed progressively,

Abstract:Based on the study of wind erosion in Youyu county，the relationship among the factors like dominant wind direction,the change of wind velo"city, the dynamics of sand collection, the changing law of wind and sand collection at different heights,the relationship between sand collection and wind velocity, soil oisture, etc.

Abstract:Through gradual regression analysis to ten kinds nutritions of soils of 54 counties, Saanxi province, the optimum regression modelfor soil utritions(including alkaline--N, quick action Ps quicick ackac-tion K, B and Zn) has been set up, It shows that soil fertility is thelimit factor of wheat production in Guanzhong plain, but this is not ase in North Shaanxi loess plateau gully hill region, Finally，correlation analysis and fuzzy cluster on soil nutriments have been done,From above mentioned, we can get a lot of information about wheat production,soil assessment and nutrition diagnosis