Abstract:The relations between major weather factors and seedling production are analysed on the basis of data collected from weather stations in Yichun forest area in 32 years. In accordance withthe practice in seedling culture,methods are presented which are feasible and practical,meanwhilebasis and measures in keeping a full stand of seedlings and preventing calamity for seedling production in the forest area are provided.

Abstract:The comparison-analysis between" 1963. 8 rain storm" and "1975. 8 rain storm" is made. Itis shown,though there are some differences between the two cases of rain storms,such as there istwelve years interval,the distance between mean hyetal regions of them is more than 500km andone of their convergence systems from SW,another from SE; but the basic weather process forthese two rain storms are very similar. The circulation characteristics for the two rain storms maysummarized as a conception model for the regional continued super rain storm during midsummerin North China.

Abstract:The analysis of the source of the water vapour and the hydrologic balance of the heavy rainfall in the upper reaches of the Huaihe River is made. The results show that one third of the rainfall in the heavy rain field comes from the transportation of the clouds. Especially,in the centralarea of the heavy rainfall. The transportation of the clouds plays a vital role.

Abstract:Based on the intensive observational data for the experiments of the torrential rain at thesouth part of Shanxi Province in 1993. The surface chart of Shanxi Province and the hourly infrared Satellite images,the rnesoscale system of the torrential rain

Abstract:Decrease tendency of air temperature has appeared in Fujian Province in the last 50 years,with a variability of --0. 0114 ℃ /a averaged over the whole province. i. e. a decrease of 0. 11 ℃per 10 years. Furthermore,in the province,the temperature has a larger decrease tendency in thecoastal areas than that in the inland areas,and that in winter and spring than that in summer.However, there was an increase tendency in the autumn of the 1980s. Precipitation has its wet period mainly in the 1950s and its drought period in the 1960s. Since the 1980s, spring (Feb. April) rainfall has obviously enhanced, but precipitation in the rainy season (May - June) hasgreatly decreased.

Abstract:The 500hpa height and circulation characteristic value of 48-144 hours forecasting byECMWF fO.r old model- T₁₀₆L₁₉ in 1991 and new model- T₂₁₃L₃₁ in 1991 - 1993 duringJune-August have been verified. The results show that after model renewal the prediction natures was instable in Summer,esl.pcially in Asia. The forecast made by the new model was generally better than the old model for the westerly belt .and was worse for the subtropical belt.

Abstract:The space filtering is applied to separate forecasting field of 24h T₄₂ products. The rnesoscalefeatures appear clearly in disturbance field,which couldn't be found in initial forecasting field (T42products). This mesoscale features is good for the prediction of heavy rainfall events in Beijing.

Abstract:Through analysis of 40 cases of heavy rain at Baoji,depending on principles of meteorologyand weathermen's experience,the influence of different-scale systems on radial--zonal distributionof heavy rain is discussed. From this. the model of forecasting heavy rain fields was completed.Also a significant test to forecast heavy rain fields in a meso-scale area is made.

Abstract:Based on both Barnes' filter theory and continuity of low-pass filter,a simple technique is designed separating mesoscale information from meteorological data. With this technique, stationand grid values of mesoscale bandpass filter can be independently obtained from observational data.Futhermore,the technique has higher precise and quicker velocity.

Abstract:The regression diagnosis for the event probability regression madal was carried out. It isshowed that probability regression model have no rationality in the sense of statistical forecastingby the distribution of the probability residua and diagnosis amotunts. Thus an advancement ofevent probability regression model is proposed and the results show that it is superior to generalregression model by mathematical proving and calculation of the examples.

Abstract:In Honghe district,strong rainfall in May or April is the key weather,it is significant for agriculture and industry to predict the strong rainfall successfully.So, based on the assumption thatthe similiar atmospheric situation makes the similiar results,Shepard interpolation is drawn intoweather forecast and one kind of nonlinear nonmedel method is obtained.

Abstract:The meteorological conditions for fruit swelling growth of Chinese prickly ash and its qualityare analysed.The results show that fruit swelling grouth of Chinese prickly ash is related to temperature,rainfall and relative humidity at its ripe stage,and these meteorological elements not onlyimpair its quality but its yield. Finally,its climatic resources and places for developing products ofhigh quality are suggested.

Abstract:The forced ripening of greenish wheat after rain is one of the serious disasters for the wheatarea of North China. The medium-range circulation characteristics and mechanisms responsiblefor the forced ripening are studied with northern 500hpa pentad mean height dataset,and an equation is obtained for the predictive purpose.Applications in 1991-1993 proved the equationuseful.