The adoption of agroforestry system aims to combine food production enhancement to compensate population growth with the improvement of agricultural marketable products to increase household income. The diversification of food crop products requires more effective land use. In Gunungkidul, high-density teak (Tectona grandis) plantation has dominated many private forests. The area under the tree crown has received low light intensity, where only shade-resistant plants can survive. Tuber crops, i.e., arrowroot (Maranta arundinacea), canna (Canna edulis) and yam (Dioscorea esculenta) are shade-tolerant crops, which were planted in tree understory for supplementary food production and income generation. The cultivation under teak stand has been overlooked due to uncertainty in tuber productivity. To address this knowledge gap, the effect of teak shade (5- and 7-year teak) on the growth and yield of the three tuber crops was examined. The results indicated that both teak trial areas (with RLI 45.13% and 38.76%) were suitable for canna production (LER > 1), while management options were recommended for enhancing arrowroot and yam production. The LER of intercropped three-tuber crops under 5 years’ teak were >1, while of those under 7 years’ teak, only canna reached >1. Canna is the preferred option to be mixed in teak agroforestry systems with low light intensity due to its consistent yields, whether planted in open area or under teak shade. Silvicultural management, pruning and thinning are recommended to increase the growing space and resource sharing for intercropped plants. Land optimization in private forest understory using shade-resistant tubers will offer medium-term benefits, provided that proper silvicultural procedures are applied.

One of the rehabilitation efforts undertaken by the Forest Research and Development Center in Bogor was to establish a mixed meranti(Dipterocarp) forest in the Gunung Dahu Research Forest, Bogor - West Java. The rehabilitation activities adopted several planting techniques, including total and line planting, used several types of red meranti (Shorea spp.). The purpose of this study was to assess the success of rehabilitation effort by analyzing the growth performance of Shorea leprosula and Shorea selanicastands in which applying total and line planting techniques. Diameter and height, as well as environmental factors such as soil texture, average litter thickness, slope, the average thickness of topsoil, and canopy density, were plant growth parameters that were observed. Growth data analysis was performed using ANOVA and followed by Duncan's test. The results showed that planting techniques affected the diameter growth. The highest growth rate was found in S. selanicaspecies with line planting techniques with the average diameter and height increment was 1.13 cm/year and 0.78 cm/year. Line planting techniques also scored the highest value of basal area and stand volumes, 0.06 m2 and 0.64 m3per year for S. leprosulaand 0.06 m2and 0.66 m3per year for S. selanica.

Abstract. Rachmat HH, Fambayun RA, Yulita KS, Susilowati A. 2020. Ex-situ conservation and management of dipterocarps genetic resources through seedlings collections and nursery establishment. Biodiversitas 21: 556-563. Dipterocarpaceae is a pantropical tree family that spread throughout Asia, including Indonesia. Dipterocarps species are highly valued for their timber. However, their existence is threatened due to illegal logging, forest degradation, and land conversion, result in population reduction in their natural habitat. Conservation nursery is one of germplasm conservation concepts that contain a living collection of endangered, commercially valuable, and multi-purpose tree species. Related to this nursery concept, Forest Research and Development Agency (FORDA) collaborated with Komatsu established a KoFCo nursery (Komatsu- FORDA Conservation Nursery). The establishment of this nursery was by field collection of dipterocarps species as targeted species, followed by sowing and acclimatization for seed and wildings, vegetative propagation using the KOFFCO cutting system, and nursing (watering, weeding, fertilizing, and soil change). At present, the KoFCo nursery has ca. 13,000 individuals of nine genera of dipterocarps seedlings originated from fifteen provinces in Indonesia. Of these, 76 species (68%) are categorized as threatened based on the IUCN red-list category and criteria. Hence, more than 60% of these threatened species were conserved and well-managed through KoFCo nursery. Seedlings collection and KoFCo nursery, therefore, play a vital role and support in ex-situ conservation effort and management of dipterocarps genetic resources.

Binuang is fast growing species which is native in Indonesia. This research is purposed to know the role of genetic variation to characteristic of binuang seedling at the age of 6 th and 10 th month from several mother trees from Pasaman, West Sumatera provenances in nursery. This research was arranged in Completely Randomized Design (CRD) with 22 pohon indukes and 5 replications. Each replication comprises 9 seedlings. Totally, there are 990 seedlings. The results showed that high genetic variation have effected observed traits of binuang seedlings. It showed by the high genetic variation of height, diameter and sturdiness quotient among binuang mother trees. Seedlings having the high value of diameter and height value of seedlings at all observation ages were from the same mother namely mother tree 17. Seedlings had the lowest average diameter at all observation ages were from the same mother namely mother tree 6. Whereas, seedlings had the lowest average height at 6 and 10 months were from mother tree 9, 7 and 6. Value of sturdiness quotient of seedlings from all mother trees at 6 and 10 months was above or classified high. Mother tree had the lowest sturdiness quotient at all observation ages was mother tree 19. The value of sturdiness quotient decreased along with increasing the age of binuang seedlings.