Abstract
Smallholder farmers’ choices of tree species in the Gunungkidul region have been limited by lack of management information. This paper describes activities to help inform farmers’ choices of three common timber species—Tectona grandis, Swietenia macrophylla and Acacia auriculiformis—in agroforestry systems in the region through (1) developing models predicting tree diameter growth based on reference growth function and the growth retardation performance and (2) estimating the contributions of site quality variables to the diameter growth retardation of ≤5 and >5-year-old stands. A total of 48 farms were selected, representing three slope ranges and two soil types, with a circular sample plot of 10 m radius established at each farm. A Quadratic model for each timber species indicated that the age of the tree explains a high percentage of the variance in diameter growth. Diameter growth varies with tree age and responds differently in each soil type and slope position. A set of site quality variables were able to predict retarded diameter performances of each tree species in two group ages and two soil types. These results suggest that the models can inform farmers’ choices of tree species and management.
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Acknowledgments
The research reported in this paper was facilitated through the Australian Centre for International Agricultural Research project, Improving Economic Outcomes for Smallholders Growing Teak in Agroforestry Systems in Indonesia (FST/2005/177), led by the Center for International Forestry Research and the World Agroforestry Centre. We thank Professor Meine van Noordwijk of the World Agroforestry Centre for his stimulating contributions in defining the “time delay’ concept as being relevant for management decisions in plantation forestry. We also thank the farmers who participated in the research, Amirah Yumn and Suci Anggrayani for statistical data analysis and Robert F. Finlayson for editing the paper.
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Sabastian, G.E., Kanowski, P., Williams, E. et al. Tree diameter performance in relation to site quality in smallholder timber production systems in Gunungkidul, Indonesia. Agroforest Syst 92, 103–115 (2018). https://doi.org/10.1007/s10457-016-0018-9
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DOI: https://doi.org/10.1007/s10457-016-0018-9