气候变化领域集成服务门户(CCPortal): Contrasting water use of two Eucalyptus clones across a precipitation and temperature gradient in Brazil

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DOI	10.1016/j.foreco.2020.118407
	Contrasting water use of two Eucalyptus clones across a precipitation and temperature gradient in Brazil
	Hubbard R.M.; Carneiro R.L.; Campoe O.; Alvares C.A.; Figura M.A.; Moreira G.G.
发表日期	2020
ISSN	0378-1127
卷号	475
英文摘要	Eucalyptus plantation productivity has increased 4-fold across Brazil as a result of improved genetic selection and intensive silviculture. However, the rate of productivity improvements is slowing and suggests increased production will require planting in areas that have never been previously planted with Eucalyptus with uncertain impacts on local water supplies. This study compares water use and water use efficiency between a drought resistant (E. grandis × E. camaldulensis) and high productivity Eucalyptus clone (E. urophylla) across three sites (dry, mesic and wet) spanning a two-fold precipitation gradient (~600–1350 mm y−1) in Brazil. Each site included a 30% reduced rainfall treatment for each clone to investigate within site response to reduced precipitation. We found that the drought resistant clone used as much or more water than the high productivity clone at all three sites. The drought resistant clone transpired almost 20% percent more water than the high productivity clone at the dry site (3.7 vs. 3.0 m3 y−1) while water use between clones did not differ at the mesic (4.6 vs 4.0 m3 y−1) and wet site (4.0 vs 4.5 m3 y−1). The high productivity clone transpired 54, 46 and 37% of annual precipitation at the dry, mesic and wet sites respectively while the drought resistant clone consumed 67, 47 and 31% of annual precipitation from the dry to the wet site. Although the rain reduction treatments did not impact annual water use for either clone at the dry and mesic sites, there were some differences at a subannual timescale. Rain reduction treatments at the dry site lowered transpiration in the driest, hottest three months for the high productivity clone by 25–32%. Rainfall reduction led to lower water use by the drought resistant clone for only one month during the dry season (18%). The high productivity clone transpired less water (24–26%) in the rainfall reduction treatment at the mesic site during three months and the drought resistant clone transpired 18 and 20% less water in the rainfall reduction treatment during two months. Rainfall reduction reduced annual transpiration by 59% for the high productivity clone at the wet site. Average water use efficiency of the drought resistant clone was almost 70% lower than the high productivity clone at the dry and mesic sites (~5.2 vs. 1.5 kg m−3 y−1) and was due to the combination of low growth and high water use. Higher than expected growth by the drought resistant clone at the wet site resulted in similar water use efficiency between clones (6.3 vs. 5.8 kg m−3 y−1). We discuss potential implications of our findings and highlight several lines of evidence that suggest the drought resistant clone in this study allocates a greater proportion of gross primary productivity below ground allowing it to access deeper reserves of soil water during dry periods. Our results suggest that decisions to plant drought resistant clones in drought prone areas should be carefully considered and also highlight the need for more research on water use and drought tolerance strategies for Eucalyptus clones bred for more arid areas in Brazil. © 2020
英文关键词	Drought tolerance; Forest management; Plantation management; Sapflow; Transpiration; Water use efficiency
语种	英语
scopus关键词	Agronomy; Drought; Efficiency; Rain; Soil moisture; Transpiration; Water supply; Annual precipitation; Annual transpiration; Eucalyptus plantations; Gross primary productivity; Intensive silvicultures; Precipitation gradients; Productivity improvements; Water use efficiency; Cloning; clone; drought resistance; dry season; evergreen forest; plantation forestry; precipitation (climatology); primary production; temperature gradient; water use; water use efficiency; Agronomy; Drought; Efficiency; Rain; Transpiration; Water Supply; Brazil; Eucalyptus; Eucalyptus camaldulensis; Eucalyptus grandis; Eucalyptus urophylla
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/155018
作者单位	USDA Forest Service, Rocky Mountain Research Station, 240 West Prospect Road, Fort CollinsCO 80524, United States; Forestry Science and Research Institute (IPEF), Piracicaba, SP 13400, Brazil; Department of Forest Sciences, University of Lavras (UFLA), LavrasMG 37200, Brazil; Department of Forest Science, São Paulo State University – UNESP, Botucatu, SP 18600, Brazil; Department of Forest Research and Development, Klabin SA, Telêmaco BorbaPR, Brazil; Department of Forest Research and Development, International Paper, Mogi GuaçuSP, Brazil
推荐引用方式 GB/T 7714	Hubbard R.M.,Carneiro R.L.,Campoe O.,et al. Contrasting water use of two Eucalyptus clones across a precipitation and temperature gradient in Brazil[J],2020,475.
APA	Hubbard R.M.,Carneiro R.L.,Campoe O.,Alvares C.A.,Figura M.A.,&Moreira G.G..(2020).Contrasting water use of two Eucalyptus clones across a precipitation and temperature gradient in Brazil.Forest Ecology and Management,475.
MLA	Hubbard R.M.,et al."Contrasting water use of two Eucalyptus clones across a precipitation and temperature gradient in Brazil".Forest Ecology and Management 475(2020).