The Study Of Intensive Land Use Based On The Human Appropriation Of Net Primary Production

With a surge of population, the development of urbanization and a series of serious land and environmental problems, how to utilize land resources intensive and efficiently has become one of the hot issues for general attention to society. At present, most of land intensive has existed that collection of data is fussy, index of evaluation is not comprehensive. For the sake of avoid these troubles, in this article with Shaanxi Province as a research area, in combination with the pre-existing statistics, with RS and GIS technology support, using HANPP to characterize the land intensive, and to analysis 2000,2005 and 2010 HANPP of in Shaanxi province.Beyond the introduction, this paper is composed of four sections:(1) through of the analysis of potential NPP, practical NPP, the loss of NPP and harvest NPP. Finally calculate HANPP in Shaanxi Province in 2000,2005 and 2010 year, and the unit area of human’s share of the net primary productivity;(2) as 2010 year for an example, based on the entropy method the farmland intensive level of Shaanxi province was calculated, and using the coupled model and coupling coordination degree model to couple with the HANPP of Shaanxi province in 2010, to explore the feasibility of HANPP characterization of land intensive utilization.(3) on the foundation of the above-mentioned analysis, the use of three close parameters with land intensive (harvest NPP, HANPP rate and the land ytilization loss rate of NPP) to analyze the spatial and temporal characteristics and origin of intensive land in Shaanxi province.(4) in the analysis of the factors of HANPP to character land intensive, and apply entropy method to analysis the relationship of these factors and land intensive on in Shaanxi Province, and to explore the influence of main factors of intensive land based onHANPP characterization.Relevant conclusions include the following:(1)from 2000 to 2010, potential NPP of Shaanxi province increase, the maximum is Guanzhong. Especially in Baoji and Weinan in 2010 the increase was the most pronounced. The spatial distribution of actual NPP more obviously than the potential NPP. The high value areas are mainly distributed in the south of southern Shaanxi, in the central of Yanan and Western of Baoji, the other region is small, these are relevant with human intervention. In 2005 the actual NPP value is maximum, in 2010 decreased slightly; the results of the loss NPP of land use show the intervention of human in the natural system have larger space difference, intervention increased areas are including Tongchuan, Hanzhoung, Weinan and Ankang, the areas of the reduction are including Yulin, Yanan, Baoji, Yangling, Xi’an, Xianyang and Shangluo.2000-2010 years, Weinan is the largest harvest the growth of NPP, followed by Xi’an, Xianyang, Baoji, second is Yulin and Ankang, finally Yangling. The HANPP rate in Yangling and Xianyang has exceeded 100%,Weinan has more than 100% in 2010, Xi’an in 2010 is higher than 90%, Baoji and Tongchuan near between 40%-50% in the three period. Yulin has be greater than 30% in the three period. Hanzhoung and Ankang are in more than 20% of the three period. Shangluo and Yanan are almost below 20% in this three period.(2) by the the analysis of coupling between the intensive farmland based on entropy method and intensive agriculture based on HANPP, we can see that:the coupling degree between the cities of Shaanxi province HANPP farmland and farmland intensive was above 0.9. Therefore, the HANPP of farmland can be used to characterize the farmland intensive conditions in Shaanxi province. With relevant literature, that HANPP can be applied to characterize the land intensive. At the same time, the urban area of Shaanxi province vh, is always less than v;, this shows that the unit of farmland HANPP levels in Shaanxi province were lagging behind the farmland intensive level, which also shows the HANPP of the farmland in Shaanxi province is still much space for improvement.(3) Through the classification of land intensive based on HANPP in Shaanxi Province in 2000,2005 and 2010 years, and through HANPP rate, the loss NPP rate of land use and harvest NPP to explore the land intensive characters in time and space in Shaanxi Province, it can be seen that:in Baoji(0.06-0.07-0.08) and Xianyang(0.06-0.07-0.08) land intensive steadily improve in 2000-2005-2010 years. Yuling(0.03-0.04-0.04) in 2000-2005 the land intensive degree increase, and later until 2010 years are unchanged. Yangling(0.08-0.08-0.11) and Weinan(0.05-0.05-0.07) in 2000-2005 years land intensive are not changed, and in 2005-2010 years increase, and this two space are the fastest in increasing land intensive in Shaanxi province. Xi’an(0.08-0.08-0.08), Hanzhong(0.07-0.07-0.07), Shangluo(0.06-0.06-0.0 6), Tongchuan(0.05-0.05-0.05) and Yanan(0.04-0.04-0.04), this shows that the land intensive degree has remained the same, but Xi’an and Hanzhong still maintained at a higher HANPP in per unit area. Land intensive in Guanzhong is more than in southern Shaanxi, and n southern Shaanxi is more than in the north of Shaanxi province(numbers in brackets for the unit area HANPP, unit:ten thousand tons of carbon above a square kilometer).(4) Seeing from the index system that has builded, the biggest influence factors for HANPP in criteria layer of intensive land in Shaanxi province is sustainability. On index layer the biggest influence factors for the intensive land in Shaanxi province is how much fertilizer is used per unit area, HANPP/NPP0(potential NPP rate), and GDP/HANPP. Form a view of the sustainable development of science and technology, ecological environment and economy influence the sustainable development of land intensive in Shaanxi Province.