DWI ASTIANI
Faculty of Forestry, Tanjungpura University. Jl. Prof. Hadari Nawawi, Pontianak 78121, West Kalimantan, Indonesia.

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The roles of community fruit garden (tembawang) on maintaining forest structure, diversity and standing biomass allocation: an alternative effort on reducing carbon emission DWI ASTIANI; RIPIN RIPIN
Biodiversitas Journal of Biological Diversity Vol. 17 No. 1 (2016)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d170148

Abstract

Astiani D, Ripin. 2016. The roles of community fruit garden (tembawang) on maintaining forest structure, diversity and standing biomass allocation: an alternative effort on reducing carbon emission. Biodiversitas 17: 359-365. Fruit garden (tembawang) Cempedak Village in Sanggau West Kalimantan has been established by local community for their family mixed garden ~ >100 years. The families of 3rd generation were utilizing the tembawang for their needs of building materials, fire woods, rattan, vegetables, fruits, and traditionals medicine. It is important to study how this tembawang play their roles in maintaing forest structure, species diversity and stocking biomass. In 2014, we studied this area for exploring the vegetation composition and their ability to stock biomass of the tembawang. Stratified Random Sampling was applied to the 6.69 ha tembawang area, which devided into three major land cover patches (Mixed fruit garden, mixed rubber plants, and fruit garden mixed with apik-Arenga undulatifolia Becc palm). We surveyed and sampled vegetation using transect methods purposively chosen on each landcover patch, with sampling area consecutively for mixed fruit garden, mixed rubber plants, and mixed of fruit garden and apik were 1.52, 0.6, and 0.72 hectars. Results demonstrated that mixed fruit garden carried out higher tree diversity, density, basal area, and maintained the largest above ground biomass per hectar compared to the two other patches. From 97 vegetation spesies registered, it maintained 49 tree species of diameter >20cm and 51 tree species in the lower strature in the forest structure. Interestingly, Durio zibethinus Murr. was a dominant species on all landcover patches types and sinked the largest above ground living biomass. The choice of fruit species on tembawang determined the capability of the embawang land to sequester and stock carbon in trees, because the trees were standing in tembawang for longer time compared to the one in production forest. This results show that, beside its multiple role for people community, tembawang provide other benefits to the nature in maintaining forest structure, diversity, and stocking large carbon in standing biomass.
Trees of tropical peatland forest influence on variability of water and carbon input through stemflow DWI ASTIANI; MUJIMAN MUJIMAN; LISA M. CURRAN
Biodiversitas Journal of Biological Diversity Vol. 18 No. 1 (2017)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d180149

Abstract

Abstract. Astiani D, Mujiman, Curran LM. 2017. Trees of tropical peatland forest influence on variability of water and carbon input through stemflow. Biodiversitas 18: 383-388. Hydrology controls the chemical and biotic processes in peatlands, influencing interactions among vegetation, nutrient dynamics, and carbon fluxes. The effects of forest degradation revealed severe changes in the hydrological cycle such as variability of water input on forest floor, soil water storage and the ability to abstract water from soil depth. A study had been conducted to investigate part of the water cycle, the amount of water and carbon input through stemflow into peatland forest floor for 2 years. Stemflow was measured on 20 trees of each 3 blocks of forest with tree diameter ranging from 10-30 cm dbh using stemflow collectors. Then the trees were grouped to three bark types (smooth, mid, and coarse) to investigate whether it had influenced the inputs. Results showed that with mean annual precipitation of 3282 ± 128mm, annual mean stemflow for the area was 18.2% of the rainfall. Further analysis demonstrated that tree species with smoother bark textures tend to bring more water to forest floor compared to mid and coarse bark textures (46% and 42.5% more than coarse and intermediate consecutively). The carbon input also show similar trend. The results implied that tree species influence the amount of stemflow and significant amount of water could be slower down come to forest floor through this mechanism and protected forest soil. Keywords: Annual stemflow, peatland forest, hydrological flow, tree barks, tree species