近20 a呼和浩特市城市化对植被物候的影响

doi:10.12118/j.issn.1000-6060.2022.076

Abstract

Abstract:

It is essential to understand the impact of human activities on ecosystems by analysing the relationship between vegetation phenology and urbanization. In this study, the vegetation phenology of Hohhot City, Inner Mongolia, China was extracted using a dynamic threshold method based on two vegetation indexes from MODIS in recent 20 years, and the response of vegetation phenology to urbanization in Hohhot City from 2001 to 2020 was investigated using the urbanization index. We found that the start of growing season (SOS) of forests and shrubs occurred earlier (132 days), and the end of growing season (EOS) also occurred earlier (265 days). The later SOS was in crops (168 days), and the later EOS was in grasslands (275 days), indicating that both SOS and EOS of woody plants were earlier than those of herbaceous plants in the study area. The phenological change rate of urban vegetation was 4.1 days earlier and 0.7 days later per decade in SOS and EOS, respectively. In addition, we explored the response of vegetation phenology to urbanization in Hohhot City, using the urban ratio and information about urban-rural gradients (concentric rings from the urban core to surrounding rural areas) as the urbanization indicators. We found that SOS was advanced with an increase in urban ratio, whereas EOS exhibited the opposite trend. From the perspective of the urban-rural gradient within a certain distance, SOS fluctuated, whereas EOS decreased at a distance from urban centres. That is, the farther away from the city center, the later SOS and the earlier EOS. In conclusion, different urbanization indicators reflect the nonlinear response of vegetation phenology to urbanization.

Key words: vegetation phenology, urbanization, Hohhot City

YUAN Zhihui, YIN Shan, SA Chula, CHI Yongfeng. Effects of urbanization on vegetation phenology in Hohhot City in the recent 20 years[J].Arid Land Geography, 2022, 45(6): 1890-1898.

Figures/Tables 9

Fig. 1

Tab. 1

Summary of two methods in determining phenology from MODIS data"

数据	平滑方法	拟合函数	物候提取方法	阈值
NDVI	Gaussian	$N D V I (t) = a + b × e - [(t - c) / d] 2$	动态阈值法	50%振幅
EVI	Timesat	$E V I (t) = (∑ i = - m i = m C i E V I j + i) / N$	动态阈值法	50%振幅

Tab. 1

Fig. 2

Fig. 3

Fig. 4

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Fig. 6

Fig. 7

Tab. 2

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观测物种	观测地点	年份	物候期	平均值/d	文献
新疆杨（Populus alba）、青杨（Populus cathayana）、毛白杨（Populus tomentosa）	呼和浩特市城区及周边地区	2010—2011	展叶盛期（4月末—5月初）	119	[9]
小叶杨（Populus simonii）	呼和浩特市南郊、土默特左旗和武川县	1994—2005	展叶盛期（4月下旬—5月上旬）变色期（10月上旬—10月中旬）	129 279	[21]
车前（Plantago asiatica）	呼和浩特市南郊、土默特左旗和武川县	1994—2005	展叶盛期（4月上旬—4月中旬）枯黄期（9月上旬—10月下旬）	110 279	[21]
垂柳（Salix babylonica）、刺槐（Robinia pseudoacacia）、华北珍珠梅（Sorbaria kirilowii）、榆叶梅（Amygdalus triloba）	内蒙古大学校园、满都海公园和呼和浩特市树木园	1999—2014	始花期（4月上旬—5月中旬）变色期（9月中旬—10月上旬）	-	[22]
山桃（Prunus davidiana）等20种主要观花树种	内蒙古农业大学东校区	2010	展叶盛期（4月下旬—5月上旬）	-	[23]
紫丁香（Syringa oblata）	内蒙古大学校园、满都海公园和呼和浩特市树木园	1979—2010	展叶盛期落叶期	106 303	[24]
马兰（Kalimeris indicus）	呼和浩特市区、武川县	1982—2007	始花期（5月初—5月下旬）落叶期（10月初—11月上旬）	131 290	[25]

Effects of urbanization on vegetation phenology in Hohhot City in the recent 20 years

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