干旱区生态环境知识资源中心(Arid): Vegetation Resilience under Increasing Drought Conditions in Northern Tanzania

Arid

DOI	10.3390/rs13224592
	Vegetation Resilience under Increasing Drought Conditions in Northern Tanzania
	Verhoeve, Steye L.; Keijzer, Tamara; Kaitila, Rehema; Wickama, Juma; Sterk, Geert
通讯作者	Verhoeve, SL (corresponding author), Univ Utrecht, Fac Geosci, Princetonlaan 8A, NL-3584 CB Utrecht, Netherlands.
来源期刊	REMOTE SENSING
EISSN	2072-4292
出版年	2021
卷号	13 期号:22
英文摘要	East Africa is comprised of many semi-arid lands that are characterized by insufficient rainfall and the frequent occurrence of droughts. Drought, overgrazing and other impacts due to human activity may cause a decline in vegetation cover, which may result in land degradation. This study aimed to assess drought occurrence, vegetation cover changes and vegetation resilience in the Monduli and Longido districts in northern Tanzania. Satellite-derived data of rainfall, temperature and vegetation cover were used. Monthly precipitation (CenTrends v1.0 extended with CHIRPS2.0) and monthly mean temperatures (CRU TS4.03) were collected for the period of 1940-2020. Eight-day maximum value composite data of the normalized difference vegetation index (NDVI) (NOAA CDR-AVHRR) were obtained for the period of 1981-2020. Based on the meteorological data, trends in rainfall, temperature and drought were determined. The NDVI data were used to determine changes in vegetation cover and vegetation resilience related to the occurrence of drought. Rainfall did not significantly change over the period of 1940-2020, but mean monthly temperatures increased by 1.06 & DEG;C. The higher temperatures resulted in more frequent and prolonged droughts due to higher potential evapotranspiration rates. Vegetation cover declined by 9.7% between 1981 and 2020, which is lower than reported in several other studies, and most likely caused by the enhanced droughts. Vegetation resilience on the other hand is still high, meaning that a dry season or year resulted in lower vegetation cover, but a quick recovery was observed during the next normal or above-normal rainy season. It is concluded that despite the overall decline in vegetation cover, the changes have not been as dramatic as earlier reported, and that vegetation resilience is good in the study area. However, climate change predictions for the area suggest the occurrence of more droughts, which might lead to further vegetation cover decline and possibly a shift in vegetation species to more drought-prone species.
英文关键词	drought impacts NDVI drought adaptation drought index vegetation resilience drought vulnerability standardized precipitation evapotranspiration index AVHRR land degradation
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:000725855300001
WOS关键词	LAND-USE ; EAST-AFRICA ; TIME-SCALES ; PRODUCTIVITY ; VARIABILITY ; ECOSYSTEMS ; SECURITY ; TRENDS ; COVER ; MODIS
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/373736
作者单位	[Verhoeve, Steye L.; Sterk, Geert] Univ Utrecht, Fac Geosci, Princetonlaan 8A, NL-3584 CB Utrecht, Netherlands; [Keijzer, Tamara] PBL Netherlands Environm Assessment Agcy, Bezuidenhoutseweg 30, NL-2594 AV The Hague, Netherlands; [Kaitila, Rehema] Lake Manyara Natl Pk, Tanzania Natl Pk, POB 3134, Arusha, Tanzania; [Wickama, Juma] Tanzania Agr Res Inst, POB 5088, Mlingano, Tanga, Tanzania
推荐引用方式 GB/T 7714	Verhoeve, Steye L.,Keijzer, Tamara,Kaitila, Rehema,et al. Vegetation Resilience under Increasing Drought Conditions in Northern Tanzania[J],2021,13(22).
APA	Verhoeve, Steye L.,Keijzer, Tamara,Kaitila, Rehema,Wickama, Juma,&Sterk, Geert.(2021).Vegetation Resilience under Increasing Drought Conditions in Northern Tanzania.REMOTE SENSING,13(22).
MLA	Verhoeve, Steye L.,et al."Vegetation Resilience under Increasing Drought Conditions in Northern Tanzania".REMOTE SENSING 13.22(2021).