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Using a combination of large and small scale exclusion plots, we will quantify ecosystem processes such as herbivory, predation, pollination, and decomposition.
Manipulation of ant and bird access will allow testing of predictions about the impact of these groups on plants, above- and belowground animal communities
across rainforest transformation systems and lowland forest. Our SP is intimately linked with plant and belowground ecological groups working on the core plots as
well as socio-economic groups working at household and village level.The speciic objective I will have responsibility for is:Ant and Bird exclusion experiments to
determine responses of ecosystem processes
93.1 Ms. Lisa Helen Denmead
Warga Negara : Selandia Baru
Jabatan : Ph.D. Student
Institusi : University of Göttingen
No. SIP : 26EXTSIPFRPSMIII2013
94. Aboveground patterns of biodiversity and associated ecosystem
Tujuan Penelitian : Menghitung secara kuantitatif proses-proses ekosistem
di hutan hujan tropik Bidang Penelitian
: Ekologi Daerah Penelitian
: Jambi TN Bukit Dua Belas dan Hutan Harapan Lama Penelitian
: 12 dua belas bulan mulai 17 Juni 2013 Mitra Kerja
: Institut Pertanian Bogor Dr. Imam Rosmana, Universitas Jambi Drs. Damris Muhammad, Ph.D. dan Universitas
Tadulako Dr. Aiyen Tjoa
Abstract
My research is part of the research collaboration CRC 990 EFForTS. Jambi Province has been chosen as main research region, because Jambi is seen as representative
for recent land use change in Indonesia under global challenge.
Two landscapes within Jambi Province have been chosen for the CRC research comprising large units of lowland rainforest in its centre: National Park Bukit
Duabelas and Harapan Rainforest. The transformation systems to be investigated
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include lowland rainforest as reference sites, jungle rubber extensive rubber plantations, and intensive rubber and oil palm plantations. In each of the two
landscapes comprising blocks in a randomized complete block design, four replicates of each of the four transformation systems including the lowland
rainforest as reference will be investigated. These 2 x 16 sites will constitute the core sites; covering these core sites is mandatory for all CRC scientiic projects
SPs that collect micro level data in order to make it possible to compare data.
Clearing of tropical forests and other land-use changes have profound efects on N availability. Conversion of lowland forests to pastures may lead to short-term
increases in soil N-cycling rates but ultimately leads to a decrease in N availability, which can be reverted after secondary forest regrows Davidson et al. 2007. In
Sulawesi, Indonesia, long-term cultivation of maize without fertilization resulted in lower N mineralization rates and microbial biomass whereas a cacao agroforestry
system displayed comparable N-cycling rates as a nearby natural forest, which was attributed to the presence of leguminous shade trees that may have added N
into the system through N2 ixation Corre et al. 2006. Land-use systems with N fertilization may lead to higher losses of NO and N2O as a consequence of increases
in nitriication and denitriication rates Veldkamp et al. 2008. Also, establishment of tree plantations generally leads to lower N availability compared to natural
forest unless the plantations contain leguminous trees Knops et al. 2002.
Hypotheses to be tested are: 1 Lowland tropical rainforest will display high N-cycling rates, with the lowest N-cycling rates found in the plantation agricultural
systems rubber and oil palm; 2 Higher degradation of soil chemical and physical characteristics in the more intensively managed rubber and oil palm plantations,
whereas the agroforestry systems jungle rubber will maintain soil characteristics closer to lowland rainforest.
Objectives of the research are: 1 Measure microbial biomass and microbially mediated N-cycling processes using the 15N pool dilution technique across a
transformation gradient; 2 Compare soil chemical and physical characteristics among the four transformation systems Forest, Jungle Rubber, Rubber Plantation,
and Oil Palm Plantation.
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94.1 Ms. Kara Elizabeth Allen
