气候变化领域集成服务门户(CCPortal): Forest restoration in southern Amazonia: Soil preparation triggers natural regeneration

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DOI	10.1016/j.foreco.2018.10.049
	Forest restoration in southern Amazonia: Soil preparation triggers natural regeneration
	Rezende G.M.; Vieira D.L.M.
发表日期	2019
ISSN	0378-1127
起始页码	93
结束页码	104
卷号	433
英文摘要	Forest regeneration in abandoned pastures in Amazonia has been well studied, but active restoration of non-resilient pastures has not. In this work, we evaluated large-scale active restoration of intensively used pastures in southern Amazonia, where the highest deforestation rates are observed. With the construction of the Jirau Dam in the Madeira river (state of Rondônia, Brazil), a 3000-ha forest buffer zone has been established. This area was previously covered by African pasture grasses for cattle ranching. Eight mixed-species planting sites with variable grass management and ranging from 6 to 60 months post-planting were measured three times over 2.5 years. We also tested a gradient of restoration intensity in an experimental planting: (i) no intervention (control), (ii) harrowing and herbicides to control grasses, and (iii) harrowing and herbicides plus tree planting. Our goals were to understand the initial trajectory of actively restored sites, the role of harrowing and herbicide application in triggering natural regeneration, and the role of seedling planting on the initial vegetation structure. All tree species ≥30 cm in height were sampled in five circular 10-m-radius plots per site. Plant cover was also monitored using the step-point method. At 18 months, stem density ranged from 2500 to 14,490 ind·ha−1, demonstrating that density increased suddenly in most sites through colonization, although this was highly variable. Tree cover reached 81% in five years, virtually eliminating grass cover after 36 months. Recruits contributed more to basal area than planted seedlings. Although 17 species, on average, were planted in restoration sites, the number of species at the sites steadily increased over time, at a rate of 7 species·yr−1 per 1570 m2. Cecropia spp. and Trema micrantha recruits had the highest stem densities and basal areas. Harrowing and grass control were enough to trigger succession in sites where natural regeneration was not taking place, shifting these sites to the highly resilient route of early secondary forest succession in the Amazon. Future restoration efforts should use a combination of methods, first evaluating the potential for natural regeneration and then gradually eliminating barriers. © 2018 Elsevier B.V.
英文关键词	Ecological filters; Ecological restoration; Natural regeneration; Reforestation; Succession; Tree planting
语种	英语
scopus关键词	Conservation; Deforestation; Ecology; Herbicides; Restoration; Seed; Weed control; Ecological restoration; Forest buffer zones; Herbicide application; Natural regeneration; Secondary forest succession; Succession; Tree plantings; Vegetation structure; Reforestation; basal area; buffer zone; deforestation; environmental factor; grass; herbicide; pasture; reforestation; restoration ecology; secondary forest; seedling; tree planting; vegetation structure; Conservation; Deforestation; Ecology; Herbicides; Restoration; Amazonia; Brazil; Madeira River; Bos; Cecropia; Nia; Poaceae; Trema micrantha
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156298
作者单位	Graduate Degree Program in Ecology, Universidade de Brasília, Brazil; Embrapa Recursos Genéticos e Biotecnologia, Parque Estação Biológica, PqEB, Av. W5 Norte (final), Brasília, DF 70770-917, Brazil
推荐引用方式 GB/T 7714	Rezende G.M.,Vieira D.L.M.. Forest restoration in southern Amazonia: Soil preparation triggers natural regeneration[J],2019,433.
APA	Rezende G.M.,&Vieira D.L.M..(2019).Forest restoration in southern Amazonia: Soil preparation triggers natural regeneration.Forest Ecology and Management,433.
MLA	Rezende G.M.,et al."Forest restoration in southern Amazonia: Soil preparation triggers natural regeneration".Forest Ecology and Management 433(2019).