干旱区生态环境知识资源中心(Arid): Savannah Phenological Dynamics Reveal Spatio-Temporal Landscape Heterogeneity in Karamoja Sub-region, Uganda

Arid

DOI	10.3389/fsufs.2020.541170
	Savannah Phenological Dynamics Reveal Spatio-Temporal Landscape Heterogeneity in Karamoja Sub-region, Uganda
	Egeru, Anthony; Magaya, John Paul; Kuule, Derick Ansyijar; Siya, Aggrey; Gidudu, Anthony; Barasa, Bernard; Namaalwa, Jjumba Justine
通讯作者	Egeru, A (corresponding author), Makerere Univ, Dept Environm Management, Kampala, Uganda. ; Egeru, A (corresponding author), Reg Univ Forum Capac Bldg Agr RUFORUM, Kampala, Uganda.
来源期刊	FRONTIERS IN SUSTAINABLE FOOD SYSTEMS
EISSN	2571-581X
出版年	2020
卷号	4
英文摘要	Phenological properties are critical in understanding global environmental change patterns. This study analyzed phenological dynamics in a savannah dominated semi-arid environment of Uganda. We used moderate-resolution imaging spectroradiometer normalized difference vegetation index (MODIS NDVI) imagery. TIMESAT program was used to analyse the imagery to determine key phenological metrics; onset of greenness (OGT), onset of greenness value, end of greenness time (EGT), end of greenness value, maximum NDVI, time of maximum NDVI, duration of greenup (DOG) and range of normalized difference vegetation index (RNDVI). Results showed that thicket and shrubs had the earliest OGT on day 85 +/- 14, EGT on day 244 +/- 32 and a DOG of 158 +/- 25 days. Woodland had the highest NDVI value for maximum NDVI, OGT, EGT, and RNDVI. In the bushland, OGT occurs on average around day 90 +/- 11, EGT on day 255 +/- 33 with a DOG of 163 +/- 36 days. The grassland showed that OGT occurs on day 96 +/- 13, EGT on day 252 +/- 36 with a total DOG of 156 +/- 33 days. Early photosynthesis activity was observed in central to eastern Karamoja in the districts of Moroto and Kotido. There was a positive relationship between rainfall and NDVI across all vegetation cover types as well as between phenological parameters and season dynamics. Vegetation senescence in the sub-region occurs around August to mid-September (day 244-253). The varied phenophases observed in the sub-region reveal an inherent landscape heterogeneity that is beneficial to extensive pastoral livestock production. Continuous monitoring of savannah phenological patterns in the sub-region is required to decipher landscape ecosystem processes and functioning.
英文关键词	conflict drylands grazing mobility pastoral
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000600630100001
WOS关键词	CLIMATE-CHANGE ; TIME-SERIES ; COPING STRATEGIES ; VEGETATION INDEX ; PLANT PHENOLOGY ; VARIABILITY ; DROUGHT ; PRODUCTIVITY ; TEMPERATURE ; DIVERSITY
WOS类目	Food Science & Technology
WOS研究方向	Food Science & Technology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/369193
作者单位	[Egeru, Anthony; Kuule, Derick Ansyijar; Namaalwa, Jjumba Justine] Makerere Univ, Dept Environm Management, Kampala, Uganda; [Egeru, Anthony] Reg Univ Forum Capac Bldg Agr RUFORUM, Kampala, Uganda; [Magaya, John Paul; Gidudu, Anthony] Makerere Univ, Coll Engn Design Art & Technol, Dept Geomat & Land Management, Kampala, Uganda; [Siya, Aggrey] Makerere Univ, Coll Vet Med Anim Resources & Biosecur, Dept Biosecur Ecosyst & Vet Publ Hlth, Kampala, Uganda; [Barasa, Bernard] Kyambogo Univ, Dept Geog & Social Studies, Kampala, Uganda
推荐引用方式 GB/T 7714	Egeru, Anthony,Magaya, John Paul,Kuule, Derick Ansyijar,et al. Savannah Phenological Dynamics Reveal Spatio-Temporal Landscape Heterogeneity in Karamoja Sub-region, Uganda[J],2020,4.
APA	Egeru, Anthony.,Magaya, John Paul.,Kuule, Derick Ansyijar.,Siya, Aggrey.,Gidudu, Anthony.,...&Namaalwa, Jjumba Justine.(2020).Savannah Phenological Dynamics Reveal Spatio-Temporal Landscape Heterogeneity in Karamoja Sub-region, Uganda.FRONTIERS IN SUSTAINABLE FOOD SYSTEMS,4.
MLA	Egeru, Anthony,et al."Savannah Phenological Dynamics Reveal Spatio-Temporal Landscape Heterogeneity in Karamoja Sub-region, Uganda".FRONTIERS IN SUSTAINABLE FOOD SYSTEMS 4(2020).