Chao CHENG，Shaoyu TONG，Haiying PENG，Shaokai YAN，Ling LlU

Institute of Land&Resources and Sustainable Development，Yunnan University of Finance and Economics，Kunming 650221，China

Relation between Economic Development Level and Resource and Environment Carrying Capacity of Central Area of Yunnan Province Based on Decoupling Analysis

Chao CHENG，Shaoyu TONG*，Haiying PENG，Shaokai YAN，Ling LlU

Institute of Land&Resources and Sustainable Development，Yunnan University of Finance and Economics，Kunming 650221，China

Based on the decoupling theory and method，an indicator system was built for the relation between economic development level and resource and environment carrying capacity.And the study was carried out on decoupling degree and temporal changes of economic development level and resource and environment carrying capacity in the central area of Yunnan Province.Results indicated that（i）the economic development level and resource and environment carrying capacity in the central area of Yunnan Province mainly experienced strong decoupling，weak decoupling，and expansive negative coupling，and in general it was strong decoupling，and it took on reverse"N"in temporal changes.（ii）Change rate of economic development level in the central area of Yunnan Province was greater than zero，but the amplitude of change was not large，while the change rate of resource and environment carrying capacity was negative in 2007-2008，and it was positive in the rest years；from 2007，it took on gradual expansion trend，and scissors difference gradually increased after experiencing reverse"V"change.（iii）The strong decoupling was the main situation and it reached the peak value in T5 period and T6 period.

The central area of Yunnan Province；Economic development level；Resource and environment carrying capacity；Decoupling analysis；Scissors difference

S ince the reform and openingup，China’s economic development level has been improving rapidly.However，with deepening of reform and opening-up，both resource and environment are facing serious challenges of resource consumption，ecological disruption，carrying pressure，and environmental pollution generated from economic growth.Therefore，properly treating the relation between stabilizing economic development and raising environment carrying capacity directly determines stability and health of the three systems，society，economy and ecology.

In recent years，some domestic scholars applied the decoupling index calculation model proposed by OECD［1］and criteria of decoupling elastic put forward by Tapio et al.［2］in the quantitative evaluation of the relation between economic growth and resource and environment.Gai Mei et al.［3］made decoupling analysis on environmental pressure and economic development of the Yangtze River Delta by decoupling theory and improved decoupling criteria.Zhao Xingguo et al.［4］，based on Outlook of Scientific Development，established decoupling criteria，and made a quantitative analysis on decoupling degree of economic growth from resource and environment pressure in Yunnan Province in 1998-2008.At present，there are many similar researches，but there are still drawbacks.（1）Using single indicator like GDP to characterize economic development situation is difficult to comprehensively reflect the relationbetween economic development level and environment carrying capacity，thus，it is necessary to establish a better indicator system.（2）There are insufficient researches in temporal changes and spatial pattern changes ofdecoupling analysis；especially，there are few researches about the relation between the economic development level and environment carrying capacity.

In view of these，we introduced the decoupling theory and criteria for decoupling degree.Taking the central area of Yunnan Province of 2006-2013 as research object，we established an indicator system to comprehensively reflect the relation between economic system and resource and environment carrying capacity，and analyzed the temporal changes of decoupling through calculating change rate and scissors difference of economic development level and environment carrying capacity，in order to prevent theoretical reference for realizing ecological，economic，and environmental protection legislation in the central area of Yunnan Province.

Research Method and lndicator System

Decoupling analysis model of economic development level and environment carrying capacity

Based on decoupling theory and method［5-6］，the calculation formula for decoupling of economic development and resource and environment carrying capacity is as follows:

whereθis decoupling index；Δu1andΔu2signify economic development level and elastic value of resource and environment carrying capacity respectively；u1startandu1enddenote overall indicator of economic development level in the start year and end year of the i-th period；u2startandu2enddenote overall indicator of resource and environment carrying capacity in the start year and end year of the i-th period.

Considering changes in economic development level and resource and environment carrying capacity，according to studies of Gai Mei［3］，we took 0.25 and 0.75 as division criterion of decoupling degree.

Establishing the evaluation indicator system

lndicator selection With reference to relevant research findings，on the scientific，overall and operable principles，we established an indicator system including 5 criteria indicators and 16 individual indicators.The indicator system consists of two evaluation hierarchies，economic development level and resource and environment carrying capacity.The economic development level evaluation hierarchy includes economic structure，economic scale，and economic benefit criterion hierarchies.The economic structure indicator hierarchy includes the percentage of primary industry and percentage of industry in gross output value of industry and agriculture；economic scale includes per capita GDP，economic density，fixed assets investment of state-owned economy；economic benefitincludes percapita added value of agriculture，forestry，animal husbandry and fishery，total retail sales of consumer goods，and average gross industrial output value of land.The resource and environment carrying capacity evaluation hierarchy includes resource carrying and environment carrying criterion hierarchies. Specifically，the resource carrying includes population density，per capita grain yield，average water producing capacity of land，and per capita resource carrying capacity；environment carrying capacity includes atmospheric environment capacity，water environment capacity，green coverage area，and environment capacity abundance index.

Determination of indicator weight

Reasonable allocation of weight is a key factor for quantifying the indicator system.To improve the objectiveness and accuracy of weight，we firstly established judgment matrix by analytic hierarchy process （AHP），calculated weightαwof each indicator［16］，made entropy correction，and calculated the overall weight.

Decoupling change trend and analysis model of economic development level and environment carrying capacity

Analysis of change rate Based on data of time series，we simulated change trend of economic development level and resource environment carrying capacity through fitting polynomial regression curve，to reflect change trend and speed of economic development level and resource and environmentcarrying capacity with time.The formula is as follows［9］:

Using the tangential slope to characterize the change rate of economic development level and resource and environment carrying capacity change curve in a certain time（t），namely，the partial differential y′u1（t）and y′u2（t）of yu1and yu2in time t.

Analysis of scissors difference

We used the scissors difference model to reflect change trend and difference of economic development level and resource and environmentcarrying capacity， and studies temporal changes in decoupling of economic development level and resource and environment carrying capacity.The formula is as follows［9］:

whereαdenotes the scissors difference between changes in economic development level and resource and environment carrying capacity，y′u1（t）and y′u2（t）are changes rate of them in time t.

Results and Analyses

Decoupling degree and temporal changes of economic development level and resource and environment carrying capacity in the central area of Yunnan Province

Calculating relevant data as per formula（1）through formula（4），we obtained the table for decoupling degree of economic development level and resource and environment carrying capacity in the central area of Yunnan Province，as listed in Table 1.From the table，we are known that there is great difference in decoupling degree of economic development level and resource and environment carrying capacity in the central area of Yunnan Province.It mainly takes on threetrends:strong decoupling，weak decoupling，and expansive negative coupling.In general，it was strong decoupling and characterized as economic development level is constantly rising，while resource and environment carrying capacity is constantly declining. This indicates that the central area of Yunnan Province still realizes rapid economic development at the sacrifice of resource and environment.As to the change trend of decoupling index，the decoupling index generally takes on inclined reverse"N".On the whole，it shows three fluctuation stages:T1 to T3，T4 to T5，and T6 to T7.In T1 to T3 period，it remained strong decoupling，showing economy was constantly growing，while resource and environment carrying capacity suffered negative growth，which is not ideal state in economic development；in T3 to T5 period，both the economy and resource and environment carrying capacity showed growth，decoupling index was obviously rising and reached the peak value in T5 period，indicating thatthe centralarea ofYunnan Province was stepping the track of transforming economic development mode；in T6 to T7 period，the decoupling index declined and resource and environmentcarrying capacity has slight increase，but the conflict between economic growth and resource and environment carrying capacity still should not be neglected.

Decoupling changes of economic developmentleveland resource and environment carrying capacity in the centralarea ofYunnan Province

Taking comprehensive indicator values of economic development level and resource and environment carrying capacity in the central area of Yunnan Province in 2006-2013 in Table 1 as samples，we fitted change trends in economic development level and resource and environment carrying capacity in the central area of Yunnan Province using formula（5）and formula（6）.The degree of fitting is 0.9876 and 0.8333 respectively.Also，we calculated change rate and scissors difference of economic development level and resource and environment carrying capacity in the central area of Yunnan Province.In 2006-2013，change rate of economic development level in the central area of Yunnan Province was positive but the amplitude of change was not big，indicating that economic level in the central area of Yunnan Province constantly grew butthe growth rate slowed down；change rate of resource and environment carrying capacity took on reverse v，and it was negative in 2007-2008，but positive in rest years，it reached the lowest value（-0.079 7）in 2007，and it gradually expanded from 2007， indicating change trend and speed of resource and environment carrying capacity in the central area of Yunnan Province were accelerating and rising with the elapse of time.The scissors difference took on reverse V change in 2006-2009，but kept constant growth from 2009，and the tangent slope of economic development level was obviously higher than the economic development level and took on expansion trend，indicating that the difference of change trend in economic development level and resource and environment carrying capacity will be further expanded.The above analysis indicated that the economic development level in the centralarea ofYunnan Province was rising on the whole in 2006-2013，showing excellent economic development situation.However，from the change trend of resource and environment carrying capacity and scissors difference，the pressure of economicdevelopmenton resource and environment gets alleviated，but the impact is still very high.

Table 1 Decoupling index of economic development level and resource and environment carrying capacity in the central area of Yunnan Province and regional prefectures and cities

Decoupling degree and temporal changes of economic development level and resource and environment carrying capacity in prefecture and cities in the central area of Yunnan Province

From Table 1，it can be known that four prefectures and cities in the central area of Yunnan Province remained in T1 to T7 period，strong decoupling accounted for 46.43%of the entire research period；all experienced strong decoupling state and it took on fluctuation on the whole，showing the economic development level was constantly growing in the recent 8 years，while resource and environment carrying capacity declined；the expansive negative decoupling accounted for 21.43%in the entire period，indicating both economic development level and resource and environmentcarrying capacity were growing and the economic growing speed was obviously higher than that of resource and environmentcarrying capacity on the whole.Through fitting the decoupling index curve of four prefectures and cities in the central area of Yunnan Province，the decoupling index took on fluctuation，rising and decline，but all reached the peak value in T5 period or T6 period，indicating that the impact of economic development level of four prefectures and cities was the greatest on resource and environment carrying capacity in 2005-2007.

The decoupling state of economicdevelopment level and resource and environment carrying capacity of Kunming City in recent 8 years took on W fluctuation trend and experienced dynamic changes from expansive negative decoupling，strong decoupling，expansive coupling，to recessive decoupling.In T1 to T7 period，strong decoupling accounted for 42.86%of the research period，indicating rise of economic development level of Kunming City had impact on resource and environment carrying capacity all the time，it grew firstly by a small margin and declined，and then grew by a large margin.Qujing City basically experienced M shape dynamic change from expansive negative decoupling，strong decoupling，weak decoupling，and recessive decoupling in T1 to T7 period. Except T1 to T2 period and T6 to T7 period，it took on decline trend，firstly by a large margin，and then by a small margin.With 2008 as the critical point，the elastic of economic development level dropped from 1.319 0 in T2 period to-0.169 2 in T3 period.The decoupling index change of Yuxi City was steady，from expansive coupling，weak negative decoupling to strong decoupling.The decoupling index was in the range of-1.362 8 to 0.162 9 in T1 to T5 period；in T6 to T7 period，it dropped rapidly and the lowest value was-39.486 7；except T1 period and T5 period，the elastic of resource and environmentcarrying capacity was negative and it took on decline trend on the whole.The change trend of decoupling index of Chuxiong Prefecture was obvious.Except in T5 and T6 period，it was positive and large on the whole；it reached the peak value 9.887 7 in T4 period，and reached the valley value-12.841 4 in T5 period.As a typical city with large area but slow economic development in Yunnan Province，Chuxiong Prefecture had elastic of economic development level in the range of-0.245 6 to 0.689 9.It experienced expansive coupling，expansive negative decoupling，recessive coupling，and strong decoupling，showing alternate change of decoupling of economic development level and resource and environment carrying capacity in this period.

Conclusions and Discussions

Conclusions

（1）As to overall situation of the region，the economic development level and resource and environment carrying capacity in the central area of Yunnan Province mainly experienced strong decoupling，weak decoupling，and expansive negative coupling，and in general it was strong decoupling，and it took on reverse“N”in temporal changes in T1 to T3 period，T4 to T5 period，and T6 to T7 period.（2）As to temporal change trend of decoupling，change rate of economic development level in the central area of Yunnan Province was greater than zero，but the amplitude of change was not large，while the change rate of resource and environmentcarrying capacitywas negative in 2007-2008，and it was positive in the rest years；from 2007，it took on gradual expansion trend，and scissors difference gradually increased after experiencing reverse V change in 2006-2009.（3）The strong decoupling was the main situation（accounting for 46.43%of the whole research period）and it reached the peak value in T5 period and T6 period.

Discussions

Firstly，due to limitation of data availability and continuity，we lack long-term panel data in this study.As a result，it is difficult to characterize development situation of the study region.Thus，it is necessary to make further long time series analysis and prediction study.Secondly，in the building and selection of indicator system，considering the wide application of future economic development to difference indicators of natural environment，it is recommended to establish an indicator system that comprehensively depicts the connotation of economic development level and resource and environment carrying capacity.Thirdly，criteria for decoupling degree lack dynamic and relative features.Especially，the base value is different in economic development level and resource and environment carrying capacity of all regions.Withoutreasonable division combining regionalrealities，itwill greatly influence the determination of decoupling relation between economic development level and resource and environment carrying capacity.

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Responsible editor：Huadong GUO

Responsible proofreader：Xiaoyan WU

基于脫鉤分析的云南省滇中地區(qū)經(jīng)濟(jì)發(fā)展水平與資源環(huán)境承載力的關(guān)系研究

程 超，童紹玉*，彭海英，閆少凱，劉玲 （云南財(cái)經(jīng)大學(xué)國(guó)土資源與持續(xù)發(fā)展研究所，云南昆明 650221）

基于脫鉤理論和方法，構(gòu)建經(jīng)濟(jì)發(fā)展水平與資源環(huán)境承載力關(guān)聯(lián)的指標(biāo)體系，對(duì)2006~2013年滇中地區(qū)經(jīng)濟(jì)發(fā)展水平和環(huán)境承載力的脫鉤程度、時(shí)序變化進(jìn)行研究。結(jié)果表明：（1）滇中地區(qū)整體的經(jīng)濟(jì)發(fā)展水平與資源環(huán)境承載力主要經(jīng)歷強(qiáng)脫鉤、弱脫鉤以及擴(kuò)張負(fù)脫鉤，總體上處于強(qiáng)脫鉤，時(shí)序上呈現(xiàn)反向"N"型變化；（2）滇中地區(qū)經(jīng)濟(jì)發(fā)展水平變化率均大于零，但變化幅度不大，而資源環(huán)境承載力變化率2007~2008年間為負(fù)值，其余年份均為正值，并從2007年呈逐漸擴(kuò)大趨勢(shì)，剪刀差經(jīng)歷倒"V"型變化后逐漸增長(zhǎng)；（3）各州市經(jīng)濟(jì)發(fā)展水平與資源環(huán)境承載力脫鉤程度及時(shí)序呈現(xiàn)波動(dòng)變化，強(qiáng)脫鉤狀態(tài)居多，且均在T5或T6時(shí)期達(dá)到最高值。

滇中地區(qū)；經(jīng)濟(jì)發(fā)展水平；資源環(huán)境承載力；脫鉤分析；剪刀差

云南省教育廳科學(xué)研究基金項(xiàng)目（2015J088）。

程超（1992-），男，安徽蕪湖人，碩士研究生，研究方向：土地資源與土地利用規(guī)劃，E-mail：chengchao19921105@126.com。*通訊作者，E-mail：tongsy@cxtc.cdu.cn。

2015-10-21

Supported by Scientific Research Foundation of Yunnan Provincial Department of Education（2015J088）.

*Corresponding author.E-mail:tongsy@cxtc.cdu.cn

Received:October 21，2015 Accepted:November 25，2015

修回日期 2015-11-25