The input-output model and multi-object planning model in economy-environmental theory was used in this study to predict and analyse the trend of development of economy-environment in Jiadi,ng county. Particular attention was paid in order to find ways to relieve the restraints in the development of economy-environment, to seek for achieving the goal of reconciliatory in economy and environment, instead of limited by present state modified the structure of system. The final goal was to obtain optimization results.We set up several assumptions, worked out several running results, analyses and assessments, to give several reasons for decision maker. 

The programme of small industrial districts is the results of combination of the economic development programme and the environment programme.lt is one of the methods which incorporate the environmental protection into the state plan.It is also one of the measures which practise environmental administration.In fact, the aim is to bring about the ecological environment construction by economic and social construction.Therefore, the construction of small industrial districts will push the rural ecological environment into the track of benign circle. 

This research work has been conducted in Quzhoum County, Hebei province.Four elementary systems including two types, i.e. planning systems(SⅠ, SⅢ ) and planting-animal breeding systems (SⅢ, SⅣ)were selected for study. The comprehensive analyses of energy efficiency, soil nutrients and farmer’s psychology of thesystems indicated that the planting-animal breeding systems were favorable inthe region.

The method of systematic analysis was used in this study. More attention was paid to the features of energy flow and nutrient cycle in crop and livestock subsystem before and after ecological agriculture construction was introduced in Liuhe village, Qingan county of Heilongjiang province. The results of analysis showed that the construction of ecological agriculture in Liuhe village provided a beneficial experience for the improvement of agroecosystem in Songnen plain and the development of the this lower income area. The objects of both improving agroecosystem productivity and protecting environment can be achieved at the same by the rational regulation of energy flow and nutrient cycle. 

It is getting to know that earthworm plays an important role in the benign recycling of rural ecological project. la this study, earthworms were cultured in vineyard and several kinds of waste were used as baits for earthworm. The results of this experiment showed that earthworm breeding in the vineyard could not only improve obviously the living condition of earthworm and the soil fertility,but also raised the yield of grape. The results also showed that the vineyard and earthworm breeding system produced both good economic and ecological benefits. 

In this paper,the structural model was applied in Nanjing Guquan ecological engineering experimental farm to analyse and optimize for its ecosystem structure. The results obtained were as follows! 1.The experimental farm should be classified four layers. Two of four layers were composed of recycling units. 2.The orientation of energy flow must follow the order of layer distribution, otherwise, this ecosystem can not gain optimal ecolomic benifits.3.The ecolomic binifits of experimental farm will be raised distinctly while organization of production according to the optimal structure. It was estimated that the output value of the new structure will be at least 1.5 times as that of the original structure without any additional investment. 

According to the ecological conditions and the function of agro-ecosystem of Kai county, this article evaluated the agro-ecological environmental quality,analyzed the existing problems in agricultural ecology and put forward some measures for protecting the ecological environment.we selected soil, air and water as main factors of ecological environment which include, soil fertility, soil quality, climate resources, air quality, water resources and water quality.The productivity of farmland was selected to reflect the function of agro-ecosystem.Based on the evaluation of singal factor, we used the method of "weighting factors" for comprehensive evaluation . We quantitatively described the agro-ecological environmental quality of different agricultural areas in Kai county, and took them in order.The research results showed that the agro-ecological environmental quality in Kai county is degrading because of human activities. The differences between agricultural areas in Kai county are obvious.The agro-ecological environmental quality of I area is the best, and IV area, the worst. The disadvantages for fully development of agricultural potential included overcut, soil erosion and water loss and unreasonable agricultural structure as well as natural incoordination of water and heat.

A brief and comprehensive discussion was made to the method of calculating industrial input in agroecosystem studies in China. Simplified practicable procedure and factors were recommended for analysis of industrial energy input on the bose of the recent situation of production and relevant information of the cuntry. More attention were given to the trouble-some problems in calculating energy cost by machinery, field operation and irrigation with appropriate analysis, information and discussion. 

Water environment is a sum of systems between aquatic creature and non-creature resources and relationships among subsystems around mankind, i.e.a compound of natural, society and economics. According to the present situation, eco-economic evaluation on water environment should pay great attention to the consistency of water environment and developments of regional economics, and to long-term macro-economic effect, social effect and ecological effect of regional water environment. The following principles should be obeyed in evaluations 1. the consistency of regional economic developments and environment, 2.the system being stable and orderly, 3.the whole maximum function of the system, 4.symbiosis (mutual benefit), and multiplicity, 5. cleanliness of water environment. In accordance with the above principles and characteristics of regional water environment,the author chose a criteria system including a series of the most important, most sensitive and quantified evaluation criteria, which affected and informed water environment.Econometrical method was also used in evaluation. 

Fuma village in hilly area of southern Jiangsu province was selected as an experimental site. The general strategic goal has been aimed at stabilizing food production--expanding forage production-improving animal production--increasing profits.The land resources has been exploited reasonably to establish cultivated pasture. Distribution of food grain, forage and cash crop’s has been regulated, and the production techniques have been improved. Resulted in the enhancement of livestocks, poultries and fish production along with the steadily increase of food product ion. New systems of crop-animal-fish integration and harmonized developing of cropping, animal husbandry and farm products processing has been initially established.Hence.the utilization rate of natural and labor resources were increased and the functions of the agroecosystems were improved as well. It achieved a simultaneous enhancement of economic, ecological and social benifits. 

The process of rice cultivation can be treated as a tracing system and divided into five stages: namely, seedling, early tillering, late tiilerin, booting and yield format ion.Five control factors( basal fertilizer, seedling density, tiller fertilizer, panicle fertilizer and grain fertilizer),two ecological factors( illumination and temperature ) and the effects of which on the. rice population, characteristics (leaf color, plant height, number of tillers) have been studied in this paper.Based on the above factors,13 regression models were established and dynamic programming has been applied to optimize the agronomic strategies for rice cultivation according to the different ecological conditions and two indicator functions (net income and yield).The results showed that, the leaf color, plant height and number of tillers could reflect the dynamic criteria of the population quality of the rice. The dynamic programming model based on the regression modes of rice growth possessed a tracing control property and had better effect on the optimization of agronomic strategies of rice production. The optimal agronomic strategies proposed by the dynamic model under normal ecological condition for rice variety"Ya-ng Geng No.2"were:Basal fertilizer 62 kg/ha; Seedlinh density 188 ×104/haTiller fertilizer 92 kg/has Panicle fertilizer 60kg/ha.Grain fertilizer 45 kg/ha.The expected yield be 8042 kg/ha with a net income 3562 yuan/ha.

Caohai is a largest fresh water lake of Northwestern Guizhou, people calls it bright pearl of plateau.lt has established as a reserve since 1985. This paper mainly deals with its basic principle of developmental planning.conservation and utilization of water body, marsh, hill and mountain of lakeshore, tourism planning and construction of reserve service etc.

This paper made a study on the efficacy of the environmental condition in the occurance and distribution of weed in farmlands, based on the systematic investigation on the weed flora of Taihu agricultural area,Jiangsu province.It was sugge- sted that the occurance amount and distribution of the weeds were not only closely effected by the natural ecological factors in fields, such as water, soil pH, light, temperature, etc,, but also remarkably controlled by the artificial ecological conditions as cultivation regime, faming technique, herbicide application arid other activities of human being.The weed control strategy of integrating the weed quarantine, weed occurance forecast, chemical control, cultivation regime,faralng technique, biologicall control and weed biomass utilization was also discnsaed in accordance with the biological properties of weeds under different coaditions.

Depending on the parallel observation of growth quantity of middle and young China-fir forests with their corresponding meteorological elements and using analytical method of grey system,analysis showed that: 1 change of the precipitation, the sunshine time of decade and the days of decade maximum air temperature≥30℃ in mountain of Hunan province is not close related with the growth of China-fir forests; 2, decade mean of air temperature, its maximun and minimun, and relative humidity is close related with the growth of China-fir forests. 

We made entirely determination and analysis for "nuisance-free of Kaifeng city, proving that taking with lay down ciltivating plan the amount of heavy metal and -organic chlorine pesticide in watermelon are less than the permissive amount of national index for food. The riping period and growing period of "nuisance-free watermelon" have no obvious difference from similar watermelon. The transfer law of their poisonous remaining quantity is root>stemand leaf > skin and palp. The results showed that the organic chlorine were enriched in watermelon, but the heavy metals were not enriched in watermelon.The remaning quantity of β type in all isomers of benzenehexachlolride is the most in watermelon and P type remaining quantity of riping watermelon is more thanthat of growing watermelon.