Replication data for: Intercropping Teak (Tectona grandis) and Maize (Zea mays): Bioeconomic Trade-off Analysis of Agroforestry Management Practices in Gunungkidul, West Java

This dataset was moved to: https://doi.org/10.34725/DVN/PG6BZIProducing high quality wood meeting export standards requires intensive tree management. Using a tree-crop interactions model (WaNuLCAS) we analyzed tree management practices in intercropped teak and maize compared to teak and maize monocultures. Tradeoff analysis in intercropped teak and maize was designed in a three-treatment factorial: initial teak density (1600 trees ha-1 (2.5m × 2.5m), 1111 trees ha-1 (3m × 3m) and 625 trees ha-1 (4m × 4m)), thinning intensity (light (25%), moderate (50%) and heavy (75%) of tree density), and pruning intensity (40% and 60% of crown biomass). Cumulative maize yield in the first 5 years of teak growth increased 10% – 38% when tree density was reduced. All simulated intercropping practices produced a higher wood volume then a monoculture, as trees benefit from crop fertilization. Maximum wood volume (m ha-1) was obtained at initial tree density of 625 trees ha-1, 25% of which was thinned in year 5 and another 25% in year 15 with 40% of the crown pruned in years 4, 10 and 15. However, greater stem diameter as can be obtained with further thinning is rewarded with higher market price per volume of wood. Profitability analysis taking into account the cost of labour (for maize production, thinning and pruning) and its effect on additional timber revenue showed that the highest Net Present Value and return to labour was provided by the system with 50% thinning in year 5. Economic optimization was not sensitive to variations around the default price assumptions.

本数据集已迁移至：https://doi.org/10.34725/DVN/PG6BZI。生产符合出口标准的优质木材，需要精细化的林木经营管理。本研究借助林木-作物互作模型（WaNuLCAS），对比分析了柚木与玉米间作体系，以及纯柚木林、纯玉米田的林木经营模式。柚木-玉米间作体系的权衡分析采用三因素析因实验设计，设置的处理因素包括：初始柚木种植密度（1600株·公顷⁻¹，即2.5m×2.5m；1111株·公顷⁻¹，即3m×3m；625株·公顷⁻¹，即4m×4m）、间伐强度（轻度：25%林木密度、中度：50%林木密度、重度：75%林木密度）以及修枝强度（树冠生物量的40%和60%）。在柚木种植的前5年，降低初始种植密度可使玉米累计产量提升10%~38%。所有模拟的间作经营模式的木材蓄积量均高于单作体系，这是因为林木可受益于作物施肥带来的养分供给。当初始种植密度为625株·公顷⁻¹时，可获得最高木材蓄积量（立方米·公顷⁻¹）：在第5年和第15年分别间伐25%的林木，并在第4、10、15年对40%的树冠进行修枝。不过，通过进一步间伐获得更大的林木胸径，可使单位体积木材获得更高的市场售价。结合玉米种植、间伐与修枝的人工成本，以及额外木材收益的效益分析显示：在第5年进行50%间伐的经营体系，可实现最高的净现值（Net Present Value）和劳动回报率。经济优化结果对默认价格假设的波动不敏感。