Studies through this article indicated that: Chongqing urban vegetation reduction, population growth and the industry and the life consumes energy and so on, lead the hot island effect inevitable to intensify.
Moreover, three kinds of grassland desertification processes were studied, i.e. ①grassland reclamation, excessive digging → vegetation reduction and excessive surface soil exposure →wind and water erosion → soil became sandy or saline-alkali;
The numerical results illustrate that with urban developing,the surface albedo decreases,the vegetation cover decreases and the surface wetness decreases,so surface sensible heat flux increases with a maximum of 140 W/m~2,and less vegetation will lead to decrease of latent heat consumption and increase the Bowen ratio in urban areas.
In this paper,we took the method of fuzzy evaluation to appraise the ecological environment quality of year 2003 in Guangxi,the result indicated that the ecological environment quality was the between good and bad,and the industrial rubbish increasing and the forest vegetation decreasing were key factors undermining environment quality.
The control technologies evaluated were area-wide acaricide application, acaricide self-treatment of white-tailed deer, vegetation reduction and reductions in the density of white-tailed deer.
Area-wide acaricide application and vegetation reduction, as well as combinations of the two technologies proved to be useful for short-term, seasonal management of ticks in small non-agricultural areas and residential sites.
Dust emissions may be influenced by human activity through vegetation reduction or soil surface disturbances.
例句来源
This article is about the inveotigation of the vicissitude and ecological benefit of the forest and the frequencies of natural drought and flood on the southern side along the Taihang Mountain dluring 2200 years(B.C.206-A.C.1985). They are divided into six periods, Before the Qin Dynasty(B.C.206), the forest vegetation was good, the forest covering rate was over 80 percent. the natural ecology was cireulating well. And there were no droughts and floods. Between western and Eastern Han for 426 years, the for...
Guizhou Province is being under threatening of deterioration of ecologic environment cau sed by reducing of forest cover and severe soil erosion.This situation not only brings about difficulty for raising living level of the residents and also deteriorates environment that descendants will live in.Analysing the reason why such a situation is formed,the author suggests following measures for turning round the trend of deteriorating environment; 1 ) protect and conserve forestry resources through legality; 2)...
Cultivation of the spring wheat ecotypes with different drought resis- tances,sterility tolerance and high water use efficiency is an important approach to realize self-supplying of grain food,returning farmland in to gr- assland and woodland,recovery of vegetation,reduction of water loss and soil erosion.Through the study on 21 characters of spring wheat ecotypes with different drought resistances and sterility tolerance,the results show that the major characters of causing variances of different ecotypes,...