Papers by Keyword: Climatic Factor

Abstract: With Mann-Kendall non-parametric test and spatial interpolation methods, the research has explored the spatial and temporal characteristics of changes of wind erosion climatic factor C within 58 years in Shandong province. The annual average C value of the province is 163.57 with the peak value occurred both in Yantai, Weihai cities and the central area. The Yellow River flood plain, which is the most serious wind erosion district, only lies between 50 ~200. The average C value has shown a significant downward trend in the entire province for 58 years, and the peak occurred in 1962 and valley value occurred in 1990. The C value has shown a downward trend in most area of the province, among which the decrease of areas centered on Ji’ning is the greatest and reach -7/a. On the Yellow River flood plain, the C value also shows a regional difference declining trend.

Abstract: Sap flow of trees was controlled by climatic variables and a time lag presents between them. In this study, Time lag between sap flow and climatic factors was analyzed for willow in the Ordos Plateau. The result shows that sap flow velocity lags behind net radiation about 110 minutes and there is almost no time lag between net radiation and sap flow velocity.

Abstract: Understanding of the interactions between climatic and hydrological factors is very important for both real situation analyses and predicting the climatic trends and potential hydrological consequences. Air temperature, precipitation, evaporation, discharge, sandiness and sediment transport for the period 1968-2009 were selected to discover the change trends and correlations of climatic and hydrological factors in the Liu River within the boundaries of Zhangwu county. The intra-year variation scope of air temperature and sandiness were largest and smallest respectively. Monthly change trend of every factor was very similarly except evaporation. The variation scope of inter annual sediment transport and evaporation were largest and smallest respectively. The trend of air temperature series for the period 1968-2009 was positive (p<0.01), and the trends of evaporation, discharge, sandiness and sediment transport series for the period 1968-2009 were negative (p<0.01).There were significant correlations among climatic and hydrological factors.