Analysis on Land Use Evolution Process in the Upper Reaches of Erhai under the Background of Urbanization

doi:10.13466/j.cnki.lyzygl.2018.01.011

Abstract

Abstract:

In recent years,the social economic development of Erhai basin has been rapid,the process of urbanization has been accelerated,and the land use has been changed greatly.It is of great significance to study the long-term evolution of land use in the upper reaches of Erhai and to analyze its correlation with urbanization.Based on the remote sensing images of the upper reaches of Erhai in 1975,1985,1995,2005 and 2015,the land use patch information of each period was extracted and the land use transfer matrix was calculated.With the help of the dynamic model of land use,information entropy model and fractal model,the evolution of land use in the upper reaches of Erhai was quantitatively described and analyzed.The results show:(1) In the recent 40 years,the forest land,farmland and shrub-grassland in the upper reaches of Erhai were the dominant land.The area of the construction land continued to increase,and the overall level of land use is at a moderate level.(2) In terms of transfer change,the main features are the outflow of shrub-grassland and the transfer of construction land.The change of dynamic degree of single land use type is small,of which the dynamic change of construction land is obvious and the area is in an increasing trend.The land use system is characterized by the outflow of shrubs and the transfer of construction land.Single dynamic degree change is small,the dynamic degree of the construction is obvious and the area is increasing.(3) Information entropy,equilibrium and stability of land use patches in the upper reaches of Erhai also changed correspondingly during the period from 1975 to 2015.Analyzing the evolution of land use in the upper reaches of Erhai under the background of urbanization can provide an important guiding significance for enhancing the degree of land intensification,planning and managing land resources reasonably,formulating economic development policies scientifically,promoting land science and sustainable utilization,and accelerating the sustainable development of towns.

Key words: urbanization, land use dynamic degree, information entropy, fractal dimension, upper reaches of Erhai

CLC Number:

TP79

NIU Xiaohua, ZHANG Chao, YU Zhexiu, ZHOU Wenjiao, HUANG Tian. Analysis on Land Use Evolution Process in the Upper Reaches of Erhai under the Background of Urbanization[J]. FOREST RESOURCES WANAGEMENT, 2018, 0(1): 72-79.

Figures/Tables 8

Tab.1

Fig.1

Tab.2

Tab.3

Fig.2

Fig.3

Tab.4

Tab.5

Land use regression model,fractal dimension and stability index in the upper reaches of Erhai

年度	土地类型	双对数线性回归模型	判决系数(R²)	分维数	稳定性指数
1975	林地	lnA(r)=1.4054lnP(r)-3.3445	R²=0.9521	1.423	0.077
	农田	lnA(r)=1.4144lnP(r)-3.3178	R²=0.9596	1.414	0.086
	灌草丛	lnA(r)=1.5577lnP(r)-3.3476	R²=0.9202	1.284	0.216
	水域	lnA(r)=1.5726lnP(r)-3.0974	R²=0.9296	1.272	0.228
	湿地	lnA(r)=1.3788lnP(r)-2.9721	R²=0.9795	1.451	0.049
	建设用地	lnA(r)=1.4334lnP(r)-3.3449	R²=0.9114	1.395	0.105
	裸地	lnA(r)=1.4453lnP(r)-3.0328	R²=0.8590	1.384	0.116
1985	林地	lnA(r)=1.4605lnP(r)-3.3638	R²=0.9499	1.369	0.131
	农田	lnA(r)=1.4121lnP(r)-3.3474	R²=0.9624	1.416	0.084
	灌草丛	lnA(r)=1.5411lnP(r)-3.3986	R²=0.929	1.298	0.202
	水域	lnA(r)=1.5791lnP(r)-3.1188	R²=0.9387	1.267	0.233
	湿地	lnA(r)=1.263lnP(r)-2.913	R²=0.9582	1.584	-0.084
	建设用地	lnA(r)=1.4375lnP(r)-3.3371	R²=0.9154	1.391	0.109
	裸地	lnA(r)=1.4065lnP(r)-2.9723	R²=0.5564	1.422	0.078
1995	林地	lnA(r)=1.4496lnP(r)-3.3392	R²=0.9405	1.38	0.12
	农田	lnA(r)=1.4006lnP(r)-3.3295	R²=0.9629	1.428	0.072
	灌草丛	lnA(r)=1.542lnP(r)-3.4048	R²=0.9202	1.297	0.203
	水域	lnA(r)=1.545lnP(r)-3.162	R²=0.9410	1.294	0.206
	湿地	lnA(r)=1.4036lnP(r)-3.0953	R²=0.9553	1.425	0.075
	建设用地	lnA(r)=1.4299lnP(r)-3.345	R²=0.9206	1.399	0.101
	裸地	lnA(r)=1.585lnP(r)-3.1189	R²=0.8443	1.262	0.238
2005	林地	lnA(r)=1.4547lnP(r)-3.4053	R²=0.9329	1.375	0.125
	农田	lnA(r)=1.4103lnP(r)-3.3726	R²=0.9598	1.418	0.082
	灌草丛	lnA(r)=1.507lnP(r)-3.3765	R²=0.9300	1.327	0.173
	水域	lnA(r)=1.5601lnP(r)-3.166	R²=0.9413	1.282	0.218
	湿地	lnA(r)=1.3587lnP(r)-2.9618	R²=0.9848	1.472	0.028
	建设用地	lnA(r)=1.3479lnP(r)-3.3246	R²=0.9007	1.484	0.016
	裸地	lnA(r)=1.4699lnP(r)-3.1324	R²=0.8831	1.361	0.139
2015	林地	lnA(r)=1.4591lnP(r)-3.3787	R²=0.9374	1.371	0.129
	农田	lnA(r)=1.411lnP(r)-3.3611	R²=0.9644	1.417	0.083
	灌草丛	lnA(r)=1.5483lnP(r)-3.4512	R²=0.9318	1.292	0.208
	水域	lnA(r)=1.5474lnP(r)-3.1865	R²=0.9435	1.292	0.208
	湿地	lnA(r)=1.3674lnP(r)-3.1137	R²=0.9422	1.463	0.037
	建设用地	lnA(r)=1.3571lnP(r)-3.3326	R²=0.9003	1.474	0.026
	裸地	lnA(r)=1.2837lnP(r)-3.1091	R²=0.6369	1.558	-0.058

Tab.5

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年度	总体分类精度/%	Kappa系数
1975	79.463	0.741
1985	88.524	0.853
1995	84.604	0.798
2005	83.158	0.778
2015	97.583	0.968

时间段		林地	农田	灌草丛	水域	湿地	建设用地	裸地	年综合动态度	土地利用程度综合指数	综合指数变化量
1975	面积/km²	563.853	296.819	222.207	14.006	10.66	40.246	13.01	—	231.383	1.327
1975	占比/%	48.574	25.57	19.143	1.207	0.918	3.467	1.121	—	231.383	1.327
1985	面积/km²	626.982	291.805	170.966	16.842	8.084	44.68	1.444	—	232.71	-0.404
1985	占比/%	54.013	25.138	14.728	1.451	0.696	3.849	0.124	—	232.71	-0.404
1995	面积/km²	635.5	286.283	163.687	16.712	7.652	46.575	4.393	—	232.306	0.173
1995	占比/%	54.747	24.662	14.101	1.44	0.659	4.012	0.378	—	232.306	0.173
2005	面积/km²	598.667	283.276	198.664	16.529	7.531	49.958	6.176	—	232.479	1.286
2005	占比/%	51.574	24.403	17.114	1.424	0.649	4.304	0.532	—	232.479	1.286
2015	面积/km²	599.181	292.949	194.459	14.788	6.981	50.509	1.935	—	233.765	—
2015	占比/%	51.618	25.237	16.752	1.274	0.601	4.351	0.16	—	233.765	—
1975—1985	面积/km²	6.313	-0.501	-5.124	0.284	-0.258	0.443	-1.157	0.606	—	—
1975—1985	占比/%	1.12	-0.169	-2.306	2.025	-2.417	1.102	-8.89	0.606	—	—
1985—1995	面积/km²	0.852	-0.552	-0.728	-0.013	-0.043	0.19	0.295	0.115	—	—
1985—1995	占比/%	0.136	-0.189	-0.426	-0.077	-0.534	0.424	20.422	0.115	—	—
1995—2005	面积/km²	-3.683	-0.3	3.497	-0.018	-0.012	0.339	0.179	0.346	—	—
1995—2005	占比/%	-0.58	-0.105	2.136	-0.11	-0.158	0.728	4.075	0.346	—	—
2005—2015	面积/km²	0.051	0.967	-0.42	-0.174	-0.055	0.055	-0.424	0.092	—	—
2005—2015	占比/%	0.009	0.341	-0.212	-1.053	-0.73	0.11	-6.867	0.092	—	—
1975—2015	面积/km²	0.883	-0.097	-0.694	0.02	-0.092	0.257	-0.277	0.1	—	—
1975—2015	占比/%	0.157	-0.033	-0.312	0.14	-0.863	0.638	-2.128	0.1	—	—

时间段	类别	林地/km²	农田/km²	灌草丛/km²	水域/km²	湿地/km²	建设用地/km²	裸地/km²	转出总量/km²	转出比例/%
1975—2015	林地	—	4.582	29.324	0.027	—	0.23	0.171	34.333	6.089
	农田	6.825	—	5.085	0.673	0.46	7.363	0.263	20.669	6.964
	灌草丛	58.628	8.543	—	0.636	—	1.451	0.343	69.6	31.322
	水域	0.012	0.923	0.075	—	0.1	2.047	0	3.157	22.537
	湿地	—	1.323	0.182	2.575	—	0.16	—	4.24	39.773
	建设用地	0.051	0.745	0.164	0.027	—	—	—	0.987	2.454
	裸地	4.144	0.683	7.023	—	—	0.0004	—	11.851	91.095
	转入总量/km²	69.661	16.799	41.852	3.938	0.56	11.25	0.777	—	—
	转入比例/%	11.626	5.734	21.522	26.633	8.028	22.274	40.159	—	—

年度	林地/%	农田/%	灌草丛/%	水域/%	湿地/%	建设用地/%	裸地/%	信息熵	均衡度	优势度
1975	48.574	25.570	19.143	1.207	0.918	3.467	1.121	1.279	0.657	0.343
1985	54.013	25.138	14.728	1.451	0.696	3.849	0.124	1.192	0.612	0.388
1995	54.747	24.662	14.101	1.440	0.659	4.012	0.378	1.196	0.614	0.386
2005	51.574	24.403	17.114	1.424	0.649	4.304	0.532	1.244	0.639	0.361
2015	51.618	25.237	16.752	1.274	0.601	4.351	0.167	1.222	0.628	0.372