Nutrient cycling in cocoa agroforestry systems (cAFS) is complex and poorly understood. To better understand the mass flow of carbon and nutrients into the soil sub-system under various contexts we quantified the mass flow of litterfall, its composition and seasonal variations in different agroforestry systems in Bokito (Central Cameroon). We studied litterfall dynamics and in situ leaf-litter cycling of cAFS established on past forest lands (F-cAFS) and savannah (S-cAFS). We also studied the decomposition of cocoa and associated tree leaf-litter in litterbags. Local secondary semi-deciduous forests were included as control. Annual litterfall in full-grown cAFS (> 15 years old) was high (9.4 Mg ha−1 y−1) and represented ca. 67% of litterfall in control forests. In full-grown cAFS, associated tree leaf-litter contributed to litterfall the most and ranged between 60 and 70% of the total amount recorded (6.3 Mg ha−1 y−1). The quantities and dynamics of the litter components monitored were similar in full-grown S- and F-cAFS. The microclimate was best buffered in forests and least buffered in young S-cAFS but could not be linked to leaf-litter decomposition. Forest leaf litterfall was higher and tended to cycle faster than total leaf-litter of cAFS, whose decomposition appeared limited by cocoa leaf-litter quality. Our study underlines (i) the critical contribution of associated trees to the nutrient cycle of agroecosystems established on poor soils and, (ii) the ability of farmers to channel associated tree communities towards similar functioning despite different past land-uses.
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This study was supported by the STRADIV (n°1405-018; Agropolis Fondation) project, the CIRAD, the ICRAF Yaoundé and the IRAD. This research was conducted within the “DP Agroforestry Cameroon” Research and Training Platform and within the framework of the CGIAR Research Program on Forests, Trees and Agroforestry (FTA). We would like to thank A. Agoume and J.P. Bidias, our field assistants in Bokito, for their contribution to this study. We would also like to thank L. Defaye for her kind revision of the English language of this manuscript.
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Mean vegetation characteristics of the cAFS and forest plots studied. F-cAFS: Cocoa agroforestry system established on forest lands. S-cAFS: Cocoa agroforestry system established on savannah. > 15 years: system over 15 years old. [0–15]: system under 16 years old. The letters after the means show significant differences (p < 0.05) after the appropriate post-hoc test (one-way ANOVA or Kruskal–Wallis). Numbers in grey show standard errors (SE). “ind”: individuals.
|S–cAFS[0–15]||S–cAFS[> 15]||F–cAFS[0–15]||F–cAFS[> 15]||Forest|
|Density (ind ha−1)||Cocoa trees||1181a||484||1172a||364||1048a||383||1288a||449|
|Small trees(< 30 cm DBH)||175bc||120||71c||55||219b||161||166bc||91||533a||88|
|Large trees(≥ cm DBH)||33b||25||40b||13||54ab||34||35b||10||76a||31|
|Basal area (m2 ha−1)||Cocoa trees||2.0b||2.2||8.4a||1.7||8.4a||1.7||8.7a||3.7|
|Small trees(< 30 cm DBH)||1.5b||1.3||1.8b||1.3||1.8b||1.3||2.7b||2.5||12.9a||15.8|
|Large trees(≥ 30 cm DBH)||4.7b||4.8||16.6ab||12.6ab||16.1ab||10.4||20.1ab||11.6||23.6a||6.6|
|Height (m)||Cocoa trees||2.2c||1.4||4.8a||0.8||3.2bc||2.0||4.7ab||0.7|
|Small trees(< 30 cm DBH)||7.4||2.1||9.6||2.9||9.6||1.9||8.4||1.4||8.1||2.2|
|Large trees(≥ 30 cm DBH)||13.2b||4.0||19.5ab||5.9||20.4ab||3.8||22.6a||5.2||23.1a||3.8|
|Shanon index of associated trees||1.621b||0.650||1.736b||0.257||1.914b||0.601||1.650||0.249||2.727a||0.173|
Sørensen indices comparing tree beta diversity between plots. F-cAFS: Cocoa agroforestry system established on forest lands. S-cAFS: Cocoa agroforestry system established on savannah.
|Full grown F- versus S-cAFS||0.628|
|Full grown S-cAFS versus forest||0.478|
|Full grown F-cAFS versus forest||0.646|
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Saj, S., Nijmeijer, A., Nieboukaho, JD.E. et al. Litterfall seasonal dynamics and leaf-litter turnover in cocoa agroforests established on past forest lands or savannah. Agroforest Syst (2021). https://doi.org/10.1007/s10457-021-00602-0
- Leaf-litter cycling
- Litterfall dynamics
- Litterbag decomposition
- Theobroma cacao