Detecting and mapping annual newly-burned plots (NBP) of swiddening using historical Landsat data in Montane Mainland Southeast Asia (MMSEA) during 1988-2016

doi:10.1007/s11442-018-1527-4

Abstract

Abstract:

Swidden agriculture is by far the dominant land use system in the uplands of Southeast Asia (SEA), as well as other tropical regions, which plays an important role in the implementation of Reducing Emissions from Deforestation and Forest Degradation (REDD) of United Nations. To our knowledge, the long-term inter-annual area of newly burned plots (NBP) of swidden agriculture in mainland Southeast Asia is still not available, let alone in the whole tropics. With the strengthening regional geo-economic cooperation in SEA, swidden agriculture has experienced and/or is still experiencing extensive and drastic transformations into other diverse market-oriented land use types since the 1990s. In this study, high-level surface reflectance products of Landsat 4/5/7/8 family sensors including Thematic Mapper (TM), Enhanced Thematic Mapper Plus (ETM+) and Operational Land Imager (OLI) acquired in March, April and May of each year between 1988 and 2016 were firstly utilized to detect and monitor the extent and area of NBP of swidden agriculture with multiple thresholds of four commonly-used vegetation indices, namely the Normalized Difference Vegetation Index (NDVI), Normalized Difference Moisture Index (NDMI), Normalized Burn Ratio (NBR) and Soil Adjusted Vegetation Index (SAVI), in combination with local phenological features of swiddening and topographical data. The results showed that: (1) an annual average of 6.08×10⁴ km² of NBP of swidden agriculture, or 3.15% of the total land area of MSEA, were estimated in the past nearly three decades. (2) Annual NBP were primarily distributed in four major geomorphic units including the Central Range of Hills, Northern Mountainous Region, Western Myanmar Hills, and Annamite Chain. (3) A decadal average analysis indicated that the NBP of swidden agriculture opened year by year declined as a whole, especially after 2010, merely with an average of 5.23×10⁴ km². (4) The top ten provincial administrative units in Cambodia, Laos, Myanmar, Thailand and Vietnam, which consistently accounted for over 90% of the newly opened swiddens of each country, showed distinct fluctuations in using slash-and-burn practices in the last decades. The Landsat-based (30 m) reconstructed 29-year longitudinal updated maps (including extent and area) of the NBP of swidden agriculture may contribute to REDD and local livelihood related studies in Continental Southeast Asia. Our study further demonstrated that the multiple vegetative indices thresholds approach holds great potential in detecting swidden agriculture in tropical mountainous regions.

Key words: swidden agriculture, phenology, newly-burned plots (NBP), Landsat, Montane Mainland Southeast Asia (MMSEA)

Peng LI, Zhiming FENG, Chiwei XIAO, Khampheng BOUDMYXAY, Yu LIU. Detecting and mapping annual newly-burned plots (NBP) of swiddening using historical Landsat data in Montane Mainland Southeast Asia (MMSEA) during 1988-2016[J].Journal of Geographical Sciences, 2018, 28(9): 1307-1328.

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	Maximum area			Minimum area
	Quantity	Proportion	Year	Quantity	Proportion	Year
MSEA	9.19	4.75	2007	3.94	2.04	2011
Cambodia	0.01	0.07	2004	-	-	2012*
Laos	1.05	4.42	2004	0.19	0.81	1993
Myanmar	6.08	9.00	1999	2.64	3.90	1996
Thailand	1.38	2.70	1998	0.29	0.57	2003
Vietnam	1.18	3.59	2007	0.25	0.75	1988

	(Quasi-) Decadal average area				Annual average area	Proportion of total land area
	1980s	1990s	2000s	2010s	1988-2016	%
MSEA	6.08	6.24	6.52	5.23	6.08	3.15
Cambodia	-	-	-	-	-	0.02
Laos	0.48	0.51	0.55	0.43	0.50	2.12
Myanmar	4.39	4.15	4.42	3.52	4.11	6.08
Thailand	0.78	0.94	0.78	0.67	0.81	1.57
Vietnam	0.43	0.63	0.77	0.60	0.66	2.00

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