DOI: 10.5194/hess-24-1649-2020
论文题名: Coffee and shade trees show complementary use of soil water in a traditional agroforestry ecosystem
作者: Muñoz-Villers L.E. ; Geris J. ; Alvarado-Barrientos M.S. ; Holwerda F. ; Dawson T.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期: 4 起始页码: 1649
结束页码: 1668
语种: 英语
Scopus关键词: Climate change
; Coffee
; Drought
; Plants (botany)
; Soil moisture
; Surface waters
; Agro-forestry ecosystems
; Agroforestry system
; Coffee plantation
; Dry and wet seasons
; Functional response
; Moisture conditions
; Prior information
; Root-water uptake
; Forestry
; agroforestry
; canopy architecture
; coffee
; functional response
; seasonality
; shading
; shallow soil
; soil moisture
; soil water
; water availability
; water stress
; water uptake
; Mexico [North America]
; Veracruz
; Coffea arabica
; Inga vera
; Lonchocarpus guatemalensis
; Trema micrantha
英文摘要: Globally, coffee has become one of the most sensitive commercial crops, being affected by climate change. Arabica coffee (Coffea arabica) grows in traditionally shaded agroforestry systems in tropical regions and accounts for ∼70 % of coffee production worldwide. Nevertheless, the interaction between plant and soil water sources in these coffee plantations remains poorly understood. To investigate the functional response of dominant shade tree species and coffee (C. arabica var. typica) plants to different soil water availability conditions, we conducted a study during near-normal and more pronounced dry seasons (2014 and 2017, respectively) and a wet season (2017) in a traditional coffee plantation in central Veracruz, Mexico. For the different periods, we specifically investigated the variations in water sources and root water uptake via MixSIAR mixing models that use δ18O and δ2H stable isotope composition of rainfall, plant xylem and soil water. To further increase our mechanistic understanding of root activity, the distribution of below-ground biomass and soil macronutrients was also examined and considered in the model as prior information. Results showed that, over the course of the two investigated dry seasons, all shade tree species (Lonchocarpus guatemalensis, Inga vera and Trema micrantha) relied, on average, on water sources from intermediate (>15 to 30 cm depth: 58± 18 % SD) and deep soil layers (>30 to 120 cm depth: 34±21 %), while coffee plants used much shallower water sources (<5 cm depth: 42±37 % and 5-15 cm depth: 52±35 %). In addition, in these same periods, coffee water uptake was influenced by antecedent precipitation, whereas trees showed little sensitiveness to antecedent wetness. Our findings also showed that during the wet season coffee plants substantially increased the use of near-surface water (+56 % from <5 cm depth), while shade trees extended the water acquisition to much shallower soil layers (+19 % from <15 cm depth) in comparison to drier periods. Despite the plasticity in root water uptake observed between canopy trees and coffee plants, a complementary use of soil water prevailed during the dry and wet seasons investigated. However, more variability in plant water sources was observed among species in the rainy season when higher soil moisture conditions were present and water stress was largely absent. © 2020 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162741
Appears in Collections: 气候变化与战略
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作者单位: Muñoz-Villers, L.E., Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Mexico City, Mexico; Geris, J., Northern Rivers Institute, School of Geosciences, University of Aberdeen, Aberdeen, Scotland, United Kingdom; Alvarado-Barrientos, M.S., Red de Ecología Funcional, Instituto de Ecología, A. C., Xalapa, Veracruz, Mexico; Holwerda, F., Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Mexico City, Mexico; Dawson, T., Department of Integrative Biology, University of California-Berkeley, Berkeley, CA, United States
Recommended Citation:
Muñoz-Villers L.E.,Geris J.,Alvarado-Barrientos M.S.,et al. Coffee and shade trees show complementary use of soil water in a traditional agroforestry ecosystem[J]. Hydrology and Earth System Sciences,2020-01-01,24(4)