Changes in water quality and land use structure in the green-belt area around Shanghai

doi:10.3969/j.issn.1000-5641.2021.04.010

Abstract

Abstract:

In this paper, we study land use change and its effects on water quality for 30 water bodies in the green-belt area of Shanghai; the analysis is based on the Markov transfer matrix and Pearson correlation analysis of field data and interpreted land use types. The results show that: the water quality is dominated by Grade Ⅳ and lower Grade Ⅴ; the proportion of water bodies with lower Grade Ⅴ is decreasing year by year; the buffer zone is dominated by construction land, forest, and grassland, with a total proportion of about 84.37%; the increase in construction land and decrease in bare land, accounted for 48.95% of the total reduced area and 50.85% of the total increased area, respectively; on the 300 m buffer scale, grassland had a positive effect on DO and Chla; on the 500 m scale, bare land was the main factor for COD_Mn deterioration; and cultivated land was positively correlated with multiple pollution indicators at two scales.

Key words: green-belt around the city, Nemero index method, Markov transition matrix, land use change

CLC Number:

X522

Tida CHEN, Dan CUI, Yuxin YUAN, Jiamin LIU, Minsheng HUANG, Ying Li. Changes in water quality and land use structure in the green-belt area around Shanghai[J]. Journal of East China Normal University(Natural Science), 2021, 2021(4): 81-89.

Figures/Tables 9

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		T₂				P_i₊	减少
		A₁	A₂	…	A_n	P_i₊	减少
T₁	A₁	P₁₁	P₁₂	…	P₁_n	P₁₊	P₁₊ – P₁₁
	A₂	P₂₁	P₂₂	…	P₂_n	P₂₊	P₂₊ – P₂₂
	…	…	…	…	…	…	…
	A_n	P_n₁	P_n₂	…	P_nn	P_n₊	P_n₊ – P_nn
P_+j		P₊₁	P₊₂	…	P_+n	P₁	P₁
增加		P₊₁ – P₁₁	P₊₂ – P₂₂	…	P_+n – P_nn

土地类型	2017年		2019年
土地类型	面积/km²	占比/%	面积/km²	占比/%
草地	1720269	7.30	2508983	10.65
耕地	623339	2.64	330141	1.40
建设用地	11844513	50.26	11444930	48.57
林地	6067225	25.74	6184296	26.24
裸地	1356707	5.76	1034039	4.39
水体	1956257	8.30	2063604	8.76

		2019						总计	减少
		草地	耕地	建设用地	林地	裸地	水体	总计	减少
2017	草地	1116497	0	373337	20019	0	18491	1528344	411848
	耕地	9866	550987	18520	54508	169914	4933	808729	257742
	建设用地	105499	11170	10392226	11170	1881597	8688	12410350	2018125
	林地	563351	0	50440	5397112	12762	54087	6077752	680640
	裸地	368534	0	183300	1208	250709	1691	805443	554733
	水体	92594	0	72641	2131	32350	1737583	1937298	199715
总计		2256340	562157	11090465	5486149	2347332	1825473	23567916
新增		1139844	11170	698239	89037	2096623	87890