The potential effects of varieties,fertilizers andenvironmental componentas and their combination on rice yieldhave been studied The energy balance,the balance of soil nutri-ents and organic matter, the economic benefits and productivitymdex of ultra-high yielding rice have also been analysed The re-sults suggested that improvement of soil water condition and thecombination of varieties fertilizers and environmental componentsas a package is a technical direection for achiving rice ultra-highyield and for increasing its economic and ecological benefits. 

With a view of soil conservation and farmerssocio-economic situation.an assessment of orchard terrace hasbeen made The conclusion is that the terrace has function ofsound soil and water conservation.but also has its limitations.The function of vetiveria spp belt interplanting and grass covered hill-side ditch is similar to terrace in soil and water conservation,and can also elimilate the limitations of terrace function. 

The flowing features of nutrient elements in anecologically sound cycling agroecosystem in Xishan village havebeen analysed.It is concluded that completing the mechanism ofthe system,rationalizing the input structure,better sustaining &protecting the system are the basic approaches for material soundcycling of the system. 

By comparing energy and value con ve rsion rates,ten multiple cropping subsystems of hilly area agroforestrysystem have been studied.The AHP method is adopted in evalu-ating the comprehensive benefit of the subsystems The resulttsare:wheat-peanut subsystem shows the highest benefit,flvesubsystems show fairly good benefit,and the other four,subrys-tems have relatively lower benefit Practical improving approachesare provided. 

The effects of covering and planting on soil eco-environment,such as water,salt,nutrition and temperature,andon barley growth and yield were studied in the coastal area ofJiangsu. The results showed that in the dry spring,the mulchcould reduce soil water evaporation,restrain soil saltaccumulation.lower soil solution concentration and too soiltemperature,and increase soil available nutrition. The crop plant-ing could reduce soil water due to barley transpiration,but soilsalt and solution concetration were still lower than those withoutcrop. The pot-culture experiment results also showed that themulch effectively promoted barley growth and significantly raisedbarley yield. 

According to the systematic thought and ecologi-cal principle,this paper approach to the method of quanti tative e-valuation of eco- benefit and function of agroecoecosystem. Thecalculative rule for the evaluation has been given. An applicationof such method in Lai bin County of Guangxi Autonomous Regionis also shown. 

Ecological damage and its economic loss on LoessPlateau in Shaanxi have been analyzed and predicted by T. Koho-nen model of 3 diniension self-organisation artiflcial neuralnetwork.The successful rate reached 100 %。The results showedthat the performance of the neural network approach is good, and therefore it might be referred as an effective assistant technquefor eco-economic damage prediction.

The residue of pursuiton soya and the degrada-tion patqttern of pursuit in soil have been studied.The half-life ofpursuit is found to be 8-9d.When the interval period from pursuitspraying to soya harvesting is 95-117d,the final residues of pur-suit from seed and haulm of sova and soit were not detected,Theconclusion is that purquit is safe to soya when sprayed properly. 

Based on plot experiment,the herbicidat effect of DPX-A7881 was observed The results show that DPX-A7881 has high herbicidal effect. Its phytotoxicity to rape and its sec- ondary phytotoxitity to the rotate paddy rice with application does of higher than 15 gAI/hm² are 30.96 %～57,81 % of rape yield reduction and 9.34 %～23.20% of rotate paddy rice yield. 

15AI/hm² chiorsulfuron was applied to winterWheat field in sou then areas of Jiangsu province,The chlorsul-furon residue in soil was 0.22 μg/kg at the rice transplanting mo-ment in the next yea, 96 8 % of applied chlorsulfuron was de-graded during the wheat growing period, and the degradationhalf-life of chlorsulfuron in soil was 38.6 d.Like wheat , rice ishighly sensitive to chlorsulfuron As of chlorsulfuron is easily de-graded in flooded soil the actual damage of chIorsulfuron to rotaterice is light,and the improving of soil fertility to some extent mayaffiliate the effects of chlorsulfuron to plant. 

Some new progresses in the study of energy flowsand energetic analysis in agroecosystems,especially the concept ofemergy created by HTOdum and the concept of biophysical capi-tal created by Giampietro et al,are introduced and assessed. Some applications of these concepts in agroecosystem analysis arediscussed. 

Recently,Ecolonomic planning and methodologyhave been receiving high priority home and abroad.IT receiveshigh attentions not only from in the academic circles,but also fromgovernments in different parts of the world In this paper,theapproach of developing ecolonomic planning is introduced,includ-ing main concepts,principals,planning targets,planningcontents,frameword methods and procedure. Some issues re-lated to the planning are also discussed in this paper. 

Landscape as a basic unit of interaction of humanand nature is taking place tremendous change Many tradltionalcultural lanscapes and patterns of land use are going down todecliiie Landscape diversity and richness are severely threatenedand are often replaced by stereotyped montonous scene.This pa-per mainly cleals with following three aspects:the Basic implica-tion of landscape and its conservation, main tasks of landscapeconservation.and landscape conservation as the basis of regionalsustainable develoupment.

The funds is a difficult problem that has per-plexed the construction and management of the nature reserves inChina for many years Based on the investigations of more than40 nature reserves,the present sources and investing levels of thereserve;in whole China are concluded and the investing presentstatus and features are also analysed,Furthermore,the measuresfor opening the funding sources are exam ined. 

The content and distribution of fluorine in soil ofdifferent areas of typical steppe in Inner Mongolia have beenstudied The result indicates that the fluorine content of soilshowing an increaxing tendency from the east to the west.Theaverage concentration of the fluorine content of soil is 286 .46 ±108. 19mg/kg The data obtained also tells that the fluorine con-tent in soil of the typical steppe in Inner Mongolia is middle com-Dared with the dncuments cnncerned at home and abroad The da-ta is in range of background content in soil of Inner Mongolia. 

The toxicity of pentachlorphenate sodium to beehas been studied by touch and in take me thods.The results showthat the touch toxici ty of pentachlorohenate sod ium to bee is80.3μg/bee When it is used with normal does to killoncomelania,it is safe to non-target being,bee.