The wetland in Dongting Lake Region is the largest lacustrine in China,which is 8.77105 hm2. It can be divided into three classes: open fresh water,seasonal flooded basin and flats,shallow fresh marshes. Due to the neglecting of environmental management and ecological construction, soil and water erosion in the upper and middle reaches of Yangtze, the deposition of sediment in lakes, reclaiming land from lake marshes on large scale, irrigation distribution of agriculture and improper cropping system at high water level zones, the regulating capacity for floods was descending, flood stage was risen and flood was prolonged. With developing wetland on large scale, it has made some harmful influence on the ecological environment. In order to utilize and protect wetland rationally,the following measures should be taken: (1)To control the scale of wetland reclamation and making great efforts to construct highefficiency multiecosystem. The reclamation without storing floodwater should be readjusted into new land use with flood storage project. The settlements should be moved to small townships. Cultivation and planning can be carried out on the land in normal years. The land could be used for storing waters when catastrophic flood takes place. Some fields which are hindrance to flood flow should be merged properly for fish culture.(2)To adjust allocation of agriculture and cropping system.(3)To breed and popularize submergencetolerant rice types.(4)To strengthen wetland comprehensive management. According to the principles of ecological engineering and previous practices, nine comprehensive utilization models which are suitable to open fresh waters, seasonal flooded basins and flats as well as shallow fresh marshes have been put forward. 

With ever increasing of population as well as acceleration of industrialization and urbanization, the scarcity of land resources and ecoenvironmental degradation resulted from unreasonable use of land have become more and more obvious.Since early 1990s, it has been recognized by almost all the countries in the world that land resources have to be used in a sustainable way in order to realize the global sustainable development. An unbalanced trend between the fast increase of population and massive decrease of cultivated land is being become more and more prominent. The reasonable and effective use of land resources is closely related to sustainable development of human society, food supply forever increasing population and maintenance of environmental quality favorable to human being. Therefore, study on optimal allocation of land resources and , then, probing into the ways of its sustainable use is significant both theoretically and practically. 

Henan Province is one of the largest agricultural provinces in China. The sustainable development of agriculture of Henan Province plays an important role in Chinas agriculture.Based on the extensive and detailed investigation and in light with the guiding principle and targets of ecological construction, the agroecological environment problems in Henan Province have been analyzed and the agriculture ecological construction measures for Henan Province have been proposed. 

At present, there is no mechanism for exchange and sharing of biodiversity information in China. It is therefore necessary to set up an information query channel with metadata to help people to know where to find required information. System analyses ,system design and program design were carried out for China Biodiversity Metedatabase. China Biodiversity Metadatabase possesses powerful information functions such as query by institute catalogue,query by thematic information and data of 133 institutions, 160 databases, 757 books and 61 maps, providing over 1 300 data sheets.

Natural mutations in Mt. Namjagbarwa Region take place extremely and frequently. Natural disasters such as earthquakes, debris, collapses and landslides, avalanches and floods are existed everywhere. Their characteristics, regulars and causes of formation as well as their social and economic affects were observed. The sequences suggested that the disasters can be characterized of chained, grouping, repeated and abrupt features. The main natural causes of their formation are intense Neotectonic movement, hilly and abysmal topography, sultry and rainy climate. They do harm to the people and their property,communications and transportation,montane agriculture and forest reserves. 

Influences of enhanced ultraviolet radiation (UV-B,280~315 nm) on biomass accumulation of spring wheat colonies were investigated and assessed under field conditions. UV-B radiation resulted in decrease of biomass accumulation of leaves, stems, roots, spikes and whole plant, changes in the patterns of biomass partitioning, and reductions in grain yield. With 5.31 kJ/m² UV-B radiation, HI decreased significantly. Model analyses indicated that UV-B radiation could decrease the accumulation rates of total biomass. The total biomass and aboveground biomass reduced with the increase of UV-B radiation. Predictor models show that enhanced UV-B radiation resulting from 10% and 20% depletion of global ozone have had great influence on the decrease of grain yield and boimass of leaves and spikes, and did not have great influence on the reduction of root biomass.

Acidbase neutralization is an important process in treatment of chemical industrial wastewater. The pH value control system introduced here adopted a parallel transforming approach with both PID control method and fuzzy control method. When the deviate of the system is low, PID control method is usually used for processing control. While the deviate of the system is high, computer fuzzy control method is usually used. The principles for designing of pH value computer fuzzy control system are described. The operation of fuzzy controller including fuzzy treatment,fuzzy regulating database setting,fuzzy calculating and counterfuzzy treatment are also introduced. To apply this control system in wastewater treatment processes could result in high treatment efficient and stable control of the treatment. 

Agricultural biodiversity is important but was neglected in China. The present situation and the trend of agricultural biodiversity in China are discussed and the main causes of the loss of agricultural biodiversity including the loss, degradation and fragmentation of habitats, monocropping,breeding and domestication of animals,overexploitation of some species, introduction and invasion of foreign species,environmental pollution and global changes have been analyzed. A series of conservation countermeasures of agricultural biodiversity in China are put forward. 

The Status quo of researches home and abroad on the sources, distributions,migration and transformation of PCDDs in soils (especially, sewage sludge) has been introduced. The high environmental stability of PCDDs has intensified its seriousness of pollution to the environment. PCDDs are mainly degraded by photolysis in the environment. Further studies on biodegradation, chemical degradation and physical treatment of PCDDs are needed. 

Research results on the elimination and buffing functions of plant to acid deposition were reviewed from three aspects:the elimination functions of plant to SO2,the buffering functions of forest canopy to wet deposition and the absorption and buffering functions of forest litter layer to acid deposition. 

Excessive agricultural nutrient losses not only lead to the waste of natural resources but contribute a large share to the environmental pollution, especially water quality deterioration. In recental years a series of environment management methods have been widely practiced in European countries to encourage farmers to adopt more environmentally friendly farming systems and to limit their nutrient input to the agricultural ecosystem in order to mitigate nutrient pollution of ground and surface water. These methods were introduced in this paper for our reference.

Based on a summary for categories of economic values of biodiversity, the values and their connotations for biodiversity in nature reserves are examined. The values are divided into four categories: direct values of extractive goods, direct values of nonextractive service, indirect values of the ecological functions and nonuse values including existence value, bequest value and option value, Furthermore, the methodologies for evaluating the values are put forward. 

The concept, characteristics, principles, contents, indicators and standard of forestry ecoenvironment evaluation were expounded,the basic framework for forestry ecoenvironment evaluation has been formed,the existing problems were indicated and the suggestions were put forward. It was emphasized that the multidimensional value of forestry ecoenvironment decided the particularity and complexity of forestry ecoenvironment evaluation.