基于MOD13Q1数据的宁夏生长季植被动态监测

doi:10.18306/dlkxjz.2017.06.009

Abstract

Abstract:

In order to ascertain the dynamics of vegetation and its impacting factors in the period of 2000-2014, based on MOD13Q1, the DEM data, and the land use classification map, this study analyzed the characteristics of the spatiotemporal distribution and future trends of the administrative areas of Ningxia Autonomous Region at different altitudes and slopes, as well as with different types of vegetation, using the Sen + Mann-Kendall nonparametric test, the Hurst index, and other methods. Based on the center of gravity migration model and transition matrix, this study analyzed the temporal change of vegetation patterns from 2000 to 2014. The results are as follows: (1) NDVI values were high in the north and the south, but low in the central area, due to its arid condition; NDVI values were significantly positively correlated with elevation and slope. (2) The transition matrix of vegetation coverage shows that the percentage of area of higher vegetation grew from 17.29% in 2000 to 31.55% in 2014, which was mainly developed from lower vegetation coverage in the beginning of the period. (3) The center of gravity migration direction indicates that moderate and higher vegetation cover centers moved: the moderate vegetation cover center migrated toward the northeast by 129.49 km, and the higher vegetation cover center migrated toward the southeast by 89.49 km. (4) The trends of NDVI show that overall, NDVI of Ningxia improved from 2000 to 2014. The area where the values of NDVI significantly increased accounted for 59.63% of the total area, while the slightly improved area accounted for 31.72% of the total. The significantly improved area of woodland and paddy accounted for 71.50% and 70.80% of the total woodland and paddy areas. The significantly improved area of NDVI firstly increased and then decreased with the increase of elevation and slope. The area in the south with increased NDVI was larger than that in the north. (5) The trend of NDVI change indicates that vegetation restoration in Ningxia is sustained—89.24% of the vegetation-covered area continued to show an improving trend, while 5.7% continued to decrease, which was mainly in the Yellow River irrigated district. The areas in southern Ningxia where NDVI presented a positive sustained development was greater than that in the north.

Key words: NDVI, temporal and spatial variation, transition matrix, center of gravity migration, Ningxia, Hurst index

Zhuowen ZHAO, Lianpeng ZHANG, Xing LI, Yongxiang WANG, Shengli WANG. Monitoring vegetation dynamics during the growing season in Ningxia based on MOD13Q1 data[J].PROGRESS IN GEOGRAPHY, 2017, 36(6): 741-752.

Figures/Tables 10

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References 23

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时段	类型	较低植被覆盖/%	低植被覆盖/%	中度植被覆盖/%	高植被覆盖/%	较高植被覆盖/%	合计/%
2000-2005	较低植被覆盖	26.30	9.49	0.35	0.13	0.08	36.36
	低植被覆盖	5.23	16.71	6.65	1.99	0.14	30.72
	中度植被覆盖	0.05	0.37	4.03	8.18	1.24	13.87
	高植被覆盖	0.01	0.06	0.24	2.22	4.11	6.63
	较高植被覆盖	0.02	0.09	0.11	0.47	11.72	12.42
	合计	31.61	26.72	11.38	12.99	17.29	100.00
2005-2010	较低植被覆盖	6.53	22.80	1.98	0.23	0.07	31.61
	低植被覆盖	0.12	9.32	15.57	1.54	0.18	26.72
	中度植被覆盖	0.03	0.15	3.16	6.84	1.21	11.38
	高植被覆盖	0.01	0.05	0.25	4.43	8.24	12.99
	较高植被覆盖	0.00	0.04	0.14	0.53	16.57	17.29
	合计	6.69	32.37	21.10	13.57	26.27	100.00
2010-2014	较低植被覆盖	2.57	3.91	0.18	0.02	0.00	6.69
	低植被覆盖	1.33	22.19	8.47	0.30	0.09	32.37
	中度植被覆盖	0.03	4.16	12.41	4.06	0.43	21.10
	高植被覆盖	0.01	0.13	1.18	5.93	6.33	13.57
	较高植被覆盖	0.01	0.09	0.23	1.23	24.70	26.27
	合计	3.96	30.48	22.48	11.54	31.55	100.00

Monitoring vegetation dynamics during the growing season in Ningxia based on MOD13Q1 data

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