Pang Hong-xi

Impact of global warming on water resource in arid area of Northwest China

As the unprecedented global warming is under way, the glacier retreat is getting more and more serious. In the inland arid area of Northwest China, due to very scarce precipitation, where there is water, there are oases. And the glacier melt water amounts to 22 % of the total direct supply of the inland river water and is of crucial importance to the survival and development of the oases. In this paper, using both the observed data and the previous research achievements of the glaciers in the inland valley of Northwest China where the oasis depending on the glacier is the only location suitable for human living, the authors describe the glacier retreat trend over the past half century, focusing on discussing the possible impact of the glacier retreat on the melt water runoff that is almost the only water resource efficient to nourish the oases. The authors find that even with increasing amount of water from the glacier with global warming, the water shortage is getting more and more serious and the environment is under a degrading way due to the accelerating economical development. The water shortage is bound to be more serious if the glacier retreat keeps on, especially after the glacier melt water is over its top for the degraded glacier scale. So suggestions are stressed in the end that a new water-saving pattern should be adopted in the area for a sustainable development due to the warming-up induced continuous glacier retreat.

Effect of landform on seasonal temperature structures across China in the past 52 years

The data of 160 national meteorological observatory stations including the long-term monthly temperature data in China were analyzed to study the seasonal variation of the spatial temperature structures across China in the past half century. It is found that temperature structures differ between seasons: a latitude temperature pattern in winter and a landform temperature pattern in summer, which indicate that the effect of landform on temperature structure is much stronger in summer than that in winter and the effect of latitudinal temperature is much stronger in winter than that in summer. The mechanisms of the seasonal difference in temperature structures are also discussed in this paper.

Comparisons of stable isotopic fractionation in winter and summer at Baishui Glacier No. 1, Mt. Yulong, China

Based on the data of δ18O in surface snow, snow pits, meltwater and the glacier-fed river water at Baishui Glacier No.1, Mt. Yulong, the isotopic fractionation behaviors in the typical monsoonal temperate glacier system in winter and summer were compared. The results indicate that the isotopic fractionation degree in summer is greater than that in winter, suggesting that the snow/ice melting is more intense in summer. Moreover, whenever it is in winter or summer, from surface snow to meltwater, and to glacier-fed river water, the gradient of δ18O with altitude gradually increases. This shows that the degree of isotopic fractionation gradually strengthens when surface snow is being converted into meltwater and finally into glacial river water, which suggests that the influence of post-depositional processes on δ18O gradient in the monsoonal temperate glacier region differs spatially.

土地节约集约利用技术方法研究:现状、问题与趋势

Currently,intensive land use research have got many research fruits. But some problems about basic theory, evaluate scale and methods, control technology of economizing land have been existed. Based on the review on researches on intensive land use,the developing trend and keystone of intensive land use research which should be enhanced in the future have been discussed in this paper.It can be concluded following research contents: ① the basic theory of intensive land use. Relevant technology and criterion, pattern and policy should be reviewed in order to construct the theory system of intensive land use research. ② surveying and evaluation of intensive land use. It is urgent to propose the indices and contents of investigating and monitoring on intensive land use and to study on surveying methods and evaluation methods from different angles of view and the process of environment change in different modes of intensive land use. ③control technology of economizing land, including controlling indicators of major types of construction land, methodologies of land use planning and zoning, engineering technologies of intensive land use. ④restoration and reuse technologies on wasted land and degraded land, including information mining and evaluation, ecological restoration and reuse on wasted and degraded land, risk evaluation and ecology restoration on contaminated land, etc. ⑤criterions and standards of intensive land use, including investigation and evaluation criterion, controlling criterion of industry land, etc. The results and conclusions in this paper will provide scientific basis for accelerating the study of intensive land use in China.