Showing papers by "Henan University of Technology published in 2004"
Journal Article•
TL;DR: Wang et al. as mentioned in this paper proposed an index system for the assessment of forest eco system services, which consists of 13 service indexes such as timber and other products, weather regulatio n, C fixation, water storage, erosion control, air quality purifying,nutrients cycle,windbreaks, cultural diversity, recreation and ecotourism, O2 release, and provisioning of habitat.
Abstract: Forest ecosystem plays a special role in maintaining the structure,function and ecologi-cal process of natural ecosystems. At present,a series of ecological problems are becoming more and more serious because of forest damage in some regions.The accurate valuation of forest ecosystem services is very important to the reserve and rational development of forest resources in China.Forest ecosystem services are divided into four groups:provisioning services,regulating services,cultural services,and su pporting services in this paper.On the basis of the service mechanism analyses,an index system for the assessment of forest eco system services has been established,which consists of 13 service indexes such as timber and other products,weather regulatio n,C fixation,water storage,erosion control,air quality purifying,nutrients cycle,windbreaks,cultural diversity,recreation and ecot ourism,O2 release,and provisioning of habitat.Then,10 services of China forest have been assessed and evaluated by taking the year of 2000 as the base year.Including timber and other products provision,C fixation,water storage,erosion control,air quality purifying,nutrients cycle,recreation and ecotourism,O2 release,and provisioning of habitat.As a result,the economic values of t hese services are 2 325.14!108,1 626.76!108,2 134.7!108,136.46!108,41.85!108,372.37!108,194.31!108,6732.48!108,and 495.94!108 yuan,respectively.The total value is estimated as 14 060.05!108 yuan with indirect values being 11 540.60!108 y uan,4.6 times that of the direct values.The results show that forest ecosystems provide huge indirect values to human being bes ides the direct value of goods,and that the indirect values are egually important as the direct values.The focuses of forest ecosy stem services and their valuation in the future should be the service mechanism and the coupling and the application of differe nt scales data.
88 citations
TL;DR: In this article, a mathematical proposition on a functional equation for x, y ≠ 0, which is encountered in calculus, is generalized step by step, involving continuity, differentiability, and relationships between them.
Abstract: In this short note, a mathematical proposition on a functional equation for x, y ≠ 0, which is encountered in calculus, is generalized step by step. These steps involve continuity, differentiability, a functional equation, an ordinary differential linear equation of the first order, and relationships between them.
2 citations