The softwares and hardwares needed in land classification system and land valuation data system are introduced briefly.The systemetical structures and functions of the two systems are also discussed.The basic calculation approaches and the model parameter determining approaches have been described by taking Tongzhou City as a demonstration area. 

The photolysis of brofluthrinate.the hydrolysis of brofluthrinate in three buffer solutions with different pH values,and the degradation of brofluthrinate in Taihu paddy soil,Jiangxi red soil and Northeastern China black soil were studied in laboratory.The results showed that the photochemical reactions of brofluthrinate in aqueous solution and in petroleum ether solution irradiated by 300 watt low-voltage mercurial lamp fitted to the second order dynamic equation.The photolysis half-lifes of brofluthrinate in the two solutions were 13.7 min and 9.4 min respectively; The hydrolysis half-lifes of brofluthrinate in three buffer solutions with pH value of 5,7 and 9 were 15. 6, 8.3 and 4.2 days respectively;The degradation half-lifes of brofluthrinate in the three different.soils were betwen 4.8 days and 8.8 days. 

The differen structures of soil animal communitites and their effects on soil nutrients have been investigated and studied in non-tillage violet soil paddy field ecosystems.The results show that paddy soil non-tillage cropping system is beneficial to the growth and reproduction of soil animals,and is also helpful to the improvement of soil chemical properties.The results also indicate that the average density of soil animal in non-tillage ridge cultured soil is the highest,in conventional tillage ridge cultured soil the second,in non-tillage level cultured soil the third,and in conventional tillage level cultured soil the lowest.The contents of available N,P,K and organic matter in non-tillage soil are all higher than that of in conventional tillage soil. 

Poyang Lake Region is one of the most important agricultural bases in Jiangxi Province,however,its ecoenvironment is facing threatening.This paper discusses the effects of various activities such as the traditional cultivation.the development of township and village enterprises,the low awareness on environmental protection of the local farmers,and the reclaimation of farmland from the Lake etc on eco-environment of the Lake.The measures for harnessing those activities have been put forward. 

The four-in-one model courtyard ecosystem in Northern Liaoning includes four components:sunlight greenhouse,warm pig house,toilet and biogas digester.The results of the study indicate that the four-in-one courtyard ecosystem has a good function on temperature raising and maintaining.The energy efficiency of this ecosystem is much better than that of a single sunlight greenhouse, and it creats a better environment for planting and breeding.keeps the biogas digester runing well in winter. 

The comprehensive benefits of 23 multicomponent-multiple cropping patterns of Along Changjiang River Economic Zone in Jiangsu are evaluated in three aspects:cereal yield increasing,return increasing and labor saving.The results indicate that for the development of intensive.high-efficient and sustainable cropping systems in this Zone,the labor saving multiple cropping patterns consisting of cereal crop,feed crop,cash crop and vegetable crop are suggested.The paddy field and the upland in those cropping patterns are based on spring corn-rice and centred on spring corn respectively. 

After a discription of the concept and the development of disasters.the paper gives an evaluation on the causes of disasters in rural eco-economic system.puts forward effective countermeasures for reducing and combating those disasters.The approaches for rational regulating of rural eco-economic systems,realizing rural eco-economic balance and reducing and preventing rural disasters have also been discussed.

The molecular genetic techniques provide a common basis for making direct comparisons among diverse organisms and a new approach in measuring genetic diversity.The recent advances in molecular genetic researches are introduced in this paper.The problems existed in the application of molecular genetic tools are also disscussed.

Urbanization is developing rapidly in the world,it causes an evidently negative influence on biodiversity,however,this does not mean that the problem can not be solved The coexistence of nature and modernization and the coordination of economic construction and biodiversity are among the goals that human being is seeking.In this paper,the development trend of urbanization,the characteristics of urban habitats and the influence of urbanization on biodiversity are discussed,and some approaches for achieving the coexistence of nature and modernization are put forward. 

Biodiversity conservation depends largely on a sound legislation in both international and national levels.China has promulgated a series of laws and regulations concerning biodiversity conservation.By the enforcement of those laws and regulations,great achievements have obtained.However,deficiencies and gaps are still existing.In this paper,the present status of biodiversity conservation legislation in China has been summarized.In view of the existing problems and on the basis of the Convention of Biological Diversity.the demands of improving and enhancing of the legislation system have been described in three aspects: ecosystem,species and genetic diversity. 

The effects of ozone on plant metablism are studied systematically in this paper.The effects discussed here are stomatal reaction,membrane permeability change; photosynthesis response,nutrient material metabolic alteration and enzyme activity change.

Biogas system is the pivot in material recycling and energy transformation of a complex agro-ecosystem.It takes agricultural organic waste materials as its raw material and produces high efficient,clean and multi-purposed fuel,forage and manure.The important roles of biogas system in the protection of rural eco-environment and in the improvement of eco-agriculture development are described in this paper.The problems existed in the development of biogas technology in China have been pointed out and the countermeasures for dealing with those problems have also been put forword. 

The classification,the contents of investigation and the sampling method for subsided,excavated and gangue occupied lands are introduced.The field data analysis and collation,the principles of planning and the contents of investigation report and planning report for land reclamation have also been described in detail. 

The results of reclamation experiment on weathered coal gangue hills showed that the planting of green manure forage grass is beneficial to the improvement of eco-environment of coal gangue hills showed that the planting of green manure forage grass is beneficial to the improvement of eco-environment of coal gangue hills and could result in higher biomass production,that is because it increases the N,P,K contents as well as microbial population in coal gangue hills,decreases the salt content in the surface layer of the hills,improves the moisture,air and thermal status of the hills and accelerates the coal gangue weathering rate. 

The results of pesticide residue investigation for paddy soil,dry farmland soil and vegetable farm soil in Shenyang showed that the residues of ordram,butachlor,trichlorphon, phoxim,atrazine,dimethoate,omethoate,deltamethrin and parathion were all lower than the detectable level;The geometrical mean levels of BHC and DDT residues were 0.011 mg/kg and 0.039 mg/kg respectively; The BHC residue in paddy soil was lower than that of in vegetable farmsoil;The DDT residues in both soils were in the same level;The main form of BHL isomer residue was β-BHC and the main form of DDT isomer residue was p,p’DDE in all the investigated soils.