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Shade trees and tree pruning alter throughfall and microclimate in cocoa (Theobroma cacao L.) production systems

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Niether, Wiebke; Armengot, Laura; Andres, Christian; Schneider, Monika and Gerold, Gerhrad (2018) Shade trees and tree pruning alter throughfall and microclimate in cocoa (Theobroma cacao L.) production systems. Annals of Forest Science, 75 (38), pp. 1-16.

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Online at: https://link.springer.com/article/10.1007/s13595-018-0723-9

Summary

Shade trees in agroforestry systems protect the understory cocoa from climate extremes. Shade tree pruning manages microclimatic conditions in favor of cocoa production while tree diversity is maintained. Adaptation of pruning has to consider seasonal changes in temperature and precipitation to protect the understory cocoa.
Context
Structural characteristics of tree stands such as species diversity, tree density, and stratification can affect throughfall and microclimate. Pruning changes the canopy and may therefore modulate internal conditions.
Aims
The aim of this study is to assess the environmental growing conditions of cocoa trees.
Methods
We monitored canopy openness and the impact of stand structure on throughfall and microclimate in three cocoa production systems (monoculture, agroforestry, and successional agroforestry) and a natural regrowth in a long-term trial in Bolivia from 2013 to 2015. We further focused on the effect of annual shade tree and cocoa pruning on these variables to evaluate the potential impact of this activity.
Results
Agroforestry systems buffered extreme climate events like temperature fluctuations compared to monocultures but reduced light and throughfall drastically. Spatial variability of throughfall and transmitted light were low under a high and closed shade tree canopy. Shade tree pruning resulted in higher canopy openness, light transmittance, and throughfall, while the buffer function of the agroforestry systems concerning temperature and humidity fluctuations was reduced.
Conclusion
Differences between cocoa production systems regarding throughfall and microclimate were overlain by pruning activities. Cocoa agroforestry systems are temporal dynamic systems. Pruning timing and intensity is pivotal for balancing light and water availability under seasonally varying environmental conditions to conserve micro-environments for cocoa production with less exposure to unfavorable climate.


EPrint Type:Journal paper
Keywords:Agroforestry, Pruning, Light, Cocoa, Throughfall, Bolivia
Subjects: Crop husbandry
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > International Cooperation > Agroforestry Systems
ISSN:Print ISSN 1286-4560, Online ISSN 1297-966X
DOI:10.1007/s13595-018-0723-9
Deposited By: Schneider, Monika
ID Code:34493
Deposited On:13 Feb 2019 14:24
Last Modified:12 May 2020 07:37
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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