环渤海地区水污染物排放的时空格局及其驱动因素

doi:10.18306/dlkxjz.2017.02.004

Abstract

Abstract:

A clear understanding of the spatiotemporal patterns and driving forces of water pollutant discharge has a crucial practical significance for regional joint reduction and prevention of water pollution. Based on the cross-section data of water pollutant discharge and socioeconomic parameters in 67 cities at the prefectural level or above, the spatiotemporal patterns and effects of spatial association of water pollution are quantitatively measured in the Bohai Rim region. Meanwhile, the socioeconomic drivers of water pollutant discharge are estimated by using the econometric model, and some suggestions for the reduction and control of regional water pollution are put forward. The results show that: (1) The Haihe River Basin is the largest and the most prominent watershed with regard to the total quantity and increment of water pollutants in the Bohai Rim Region. Its COD and NH₃-N discharges accounted for 38.94% and 39.23% of the regional total discharges, respectively. (2) The spatial pattern of high water pollutant discharge areas has changed greatly, from scattered to continuous distribution since 2005. The Beijing-Tianjin-Hebei region, the Central and Southern Liaoning region, and the Shandong Peninsula region become the superimposed areas of high discharge zone of COD and NH₃-N. (3) Discharges of water pollutants have significant spatial association effects in the Bohai Rim region, and the significance of water pollutant discharge presents a general decreasing trend from the coastal area to inland areas. Moreover, the Beijing-Tianjin-Hebei region has been situated in the hotspots for a long period, and the coverage of hotspot and sub-hotspot areas has expanded continuously from the Beijing-Tianjin-Hebei region to the Haihe River and Huaihe River Basin since 2012. (4) By means of an ordinary least squares (OLS) model estimation, it is demonstrated that there are significant differences in the driving forces of water pollutant discharges. Economic growth rate and fixed asset investment show marked positive correlation with COD discharge, and the level of urbanization and industrialization act as a disincentive to COD discharge. Population size is the primary driving factor of NH₃-N discharge in the Bohai Rim region, and fixed asset investment and foreign direct investment also show marked positive correlation with NH₃-N discharge. There is an appreciable association of high capital investment and high water pollutant discharge in the Bohai Rim region. But high economic development level depresses the discharge of water pollutant, especially in the accumulation zone of high intensity discharge.

Key words: water pollutant discharge, spatiotemporal pattern, spatial association, driving force, Bohai Rim Region

Kan ZHOU, Jie FAN, Hanchu LIU. Spatiotemporal patterns and driving forces of water pollutant discharge in the Bohai Rim Region[J].PROGRESS IN GEOGRAPHY, 2017, 36(2): 171-181.

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指标项	地区	化学需氧量		氨氮
指标项	地区	2005年	2012年	2005年	2012年
排放总量/×10⁴t	环渤海地区	302.15	635.30	36.98	54.23
排放总量/×10⁴t	全国平均	1364.92	2372.81	145.45	249.73
单位排放量/×10⁴t	环渤海地区	4.51	9.48	0.55	0.81
单位排放量/×10⁴t	全国平均	4.03	7.00		0.74

流域	化学需氧量/×10⁴t			氨氮/×10⁴t
流域	2005年	2012年	贡献率/%	2005年	2012年	贡献率/%
海河	130.79	247.39	35.00	14.05	21.27	41.87
辽河	68.07	152.83	25.44	9.76	12.24	14.41
淮河	43.21	112.94	20.93	4.96	11.07	35.47
黄河	50.72	87.78	11.12	6.87	8.14	7.39
松花江	5.50	21.08	4.68	0.70	0.97	1.53
内陆河	3.87	13.28	2.82	0.64	0.53	-0.66
环渤海地区	302.15	635.30	—	36.98	54.23	—

指标项	年份	Moran’s I	方差	Z(I)	P值
化学需氧量	2005	0.149037	0.005675	2.179537	0.029292
化学需氧量	2012	0.167632	0.005992	2.361349	0.018209
氨氮	2005	0.111121	0.005730	1.668120	0.095292
氨氮	2012	0.199535	0.005872	2.801669	0.005084

变量	总体模型				热区模型
变量	系数	标准误差	t	Sig.	系数	标准误差	t	Sig.
constant	11.6640	2.6526	4.3972	0.0000	16.2826	2.7216	5.9826	0.0000
lnTP	0.1984	0.2156	0.9203	0.3611	-0.0996	0.1885	-0.5283	0.6029
lnUR	-0.9504^***	0.3536	-2.6874	0.0093	-1.4097^***	0.3813	-3.6973	0.0013
lnPGDP	-0.1331	0.1978	-0.6728	0.5037	-0.2982^*	0.1775	-1.6804	0.1077
lnGRGDP	0.8730^*	0.4792	1.8216	0.0736	0.1837	0.4687	0.3919	0.6991
lnIS	-0.7999^**	0.3599	-2.2226	0.0301	-0.4772	0.3979	-1.1995	0.2437
lnFDI	-0.0240	0.0429	-0.5587	0.5785	0.1178	0.0721	1.6332	0.1173
lnFAI	0.6986^***	0.2247	3.1085	0.0029	0.6658^***	0.2206	3.0180	0.0065
P值	0.0000				0.0000
F值	26.7017				11.3521
调整后R²	0.7316				0.7213
D.W值	1.9225				2.0711

变量	总体模型				热区模型
变量	系数	标准误差	t	Sig.	系数	标准误差	t	Sig.
constant	4.7835	1.5686	3.0496	0.0034	6.2443	1.9030	3.2813	0.0026
lnTP	0.5822^***	0.1275	4.5674	0.0000	0.5072^***	0.1367	3.7105	0.0008
lnUR	-0.0943	0.2091	-0.4510	0.6537	-0.0566	0.2615	-0.2163	0.8303
lnPGDP	-0.2502^**	0.1170	-2.1390	0.0366	-0.4285^***	0.1313	-3.2643	0.0027
lnGRGDP	0.4116	0.2834	1.4523	0.1517	0.1617	0.3595	0.4496	0.6562
lnIS	0.0426	0.2128	0.2000	0.8422	0.3048	0.2800	1.0886	0.2850
lnFDI	0.0488^*	0.0254	1.9206	0.0596	0.0820^*	0.0455	1.8014	0.0817
lnFAI	0.2851^**	0.1329	2.1456	0.0360	0.2892^*	0.1458	1.9834	0.0565
P值	0.0000				0.0000
F值	76.7771				39.1698
调整后R²	0.8893				0.8784
D.W值	2.3247				2.1168

Spatiotemporal patterns and driving forces of water pollutant discharge in the Bohai Rim Region

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