Purbopuspito, Joko

[["dc.bibliographiccitation.firstpage","n/a"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Global Biogeochemical Cycles"],["dc.bibliographiccitation.lastpage","n/a"],["dc.bibliographiccitation.volume","20"],["dc.contributor.author","Purbopuspito, Joko"],["dc.contributor.author","Veldkamp, Edzo"],["dc.contributor.author","Brumme, Rainer"],["dc.contributor.author","Murdiyarso, Daniel"],["dc.date.accessioned","2021-12-08T12:27:28Z"],["dc.date.available","2021-12-08T12:27:28Z"],["dc.date.issued","2006"],["dc.description.abstract","Studies on soil-atmosphere flux of N2O, NO and CH4 in tropical forests have mainly focused on tropical lowland forests. Here we present the first intensive study of trace gas fluxes along an elevation sequence of tropical montane forests ranging from 1190 m to 2470 m elevation in Central Sulawesi, Indonesia. Using chamber techniques, we measured monthly flux rates and controlling factors on three elevations, each with three replicate plots for 1 year. Annual N2O fluxes ranged from 0.29 kg N ha−1 yr−1 at 1800 m to 1.01 kg N ha−1 yr−1 at 2470 m and 1.11 kg N ha−1 yr−1 at 1190 m, while annual NO fluxes ranged from 0.17 kg N ha−1 yr−1 at 1800 m, to 0.18 kg N ha−1 yr−1 at 2470 m and 0.48 kg N ha−1 yr−1 at 1190 m. Methane uptake ranged from 1.45 kg C ha−1 yr−1 at 2470 m to 2.45 kg C ha−1 yr−1 at 1190 m and 3.32 kg C ha−1 yr−1 at 1800 m. At the highest elevation, methane uptake was affected by the thick organic layer present at the surface of the soil. Several lines of evidence (soil N stocks, extractable inorganic N, litterfall mass, litterfall-N and δ15N signals in litterfall and soil organic matter) show that the annual N2O + NO emissions could be explained by the inherent N status of these forests. In a test of indices of N cycling to explain N2O and NO fluxes, the robustness of litterfall C/N and litterfall N was confirmed and the δ15N signal of litterfall emerged as promising driver for regional and global biogeochemical models that predict N2O + NO emissions from soil."],["dc.identifier.doi","10.1029/2005GB002516"],["dc.identifier.gro","3150141"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/95359"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-476"],["dc.notes.status","public"],["dc.relation.isreplacedby","hdl:2/95359"],["dc.relation.issn","0886-6236"],["dc.rights.uri","http://doi.wiley.com/10.1002/tdm_license_1.1"],["dc.subject","CH4;montane tropical forest;N2O;NO;soil N cycling"],["dc.title","Trace gas fluxes and nitrogen cycling along an elevation sequence of tropical montane forests in Central Sulawesi, Indonesia"],["dc.title.alternative","TRACE GAS FLUXES FROM MONTANE TROPICAL FORESTS"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","G2"],["dc.bibliographiccitation.journal","Journal of Geophysical Research: Biogeosciences"],["dc.bibliographiccitation.volume","113"],["dc.contributor.author","Veldkamp, Edzo"],["dc.contributor.author","Purbopuspito, Joko"],["dc.contributor.author","Corre, Marife D."],["dc.contributor.author","Brumme, Rainer"],["dc.contributor.author","Murdiyarso, Daniel"],["dc.date.accessioned","2017-09-07T11:43:41Z"],["dc.date.available","2017-09-07T11:43:41Z"],["dc.date.issued","2008"],["dc.description.abstract","1] Land use changes and land use intensification are considered important processes contributing to the increasing concentrations of the greenhouse gases nitrous oxide (N2O) and methane (CH4) and of nitric oxide (NO), a precursor of ozone. Studies on the effects of land use changes and land use intensification on soil trace gas emissions were mostly conducted in Latin America and only very few in Asia. Here we present results from Central Sulawesi where profound changes in land use and cultivation practices take place: traditional agricultural practices like shifting cultivation and slash-and-burn agriculture are replaced by permanent cultivation systems and introduction of income-generating cash crops like cacao. Our results showed that N2O emissions were higher from cacao agroforestry (35 ± 10 μg N m−2 h−1) than maize (9 ± 2 μg N m−2 h−1), whereas intermediate rates were observed from secondary forests (25 ± 11 μg N m−2 h−1). NO emissions did not differ among land use systems, ranging from 12 ± 2 μg N m−2 h−1 for cacao agroforestry and secondary forest to 18 ± 2 μg N m−2 h−1 for maize. CH4 uptake was higher for maize (−30 ± 4 μg C m−2 h−1) than cacao agroforestry (−18 ± 2 μg C m−2 h−1) and intermediate rates were measured from secondary forests (−25 ± 4 μg C m−2 h−1). Combining these data with results from other studies in this area, we present chronosequence effects of land use change on trace gas emissions from natural forest, through maize cultivation, to cacao agroforestry (with or without fertilizer). Compared to the original forests, this typical land use change in the study area clearly led to higher N2O emissions and lower CH4 uptake with age of cacao agroforestry systems. We conclude that this common land use sequence in the area combined with the increasing use of fertilizer will strongly increase soil trace gas emissions. We suggest that the future hot spot regions of high N2O (and to a lesser extend NO) emissions in the tropics are those areas where climatic and edaphic conditions allow for intensive agriculture. This scenario is probably preferable over the alternative of agriculture extensification, which would imply a dramatic increase in deforestation rates with accompanying CO2 emissions."],["dc.identifier.doi","10.1029/2007jg000522"],["dc.identifier.gro","3150208"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6947"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0148-0227"],["dc.subject","agroforestry; cacao; deforestation; fertilizer; Indonesia; land use change"],["dc.title","Land use change effects on trace gas fluxes in the forest margins of Central Sulawesi, Indonesia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]