Penulis                 :               Rully Adi Nugroho

Bidang Ilmu        :               Biologi

Unit Peneliti       :               Fakultas Biologi

Jenis Penelitian :               Lain-lain

Contact Person :               Rully Adi Nugroho

Email Contact     :               rully_adi_nugroho@yahoo.com

Keyword              :               Biodiversity of ammonia-oxidizing
bacteria

Abstraksi

Soil provides a particularly interesting arena to study the
many phenomena related to biological complexity and ecosystem processes. One of
these soil processes that show a clear relation between microbial biodiversity
and process rates is nitrification. Nitrification is carried out in most
ecosystems by autotrophic bacteria and is often rate limited by the activities
of ammonia-oxidising bacteria (AOB) that are responsible for the oxidation of
ammonia to nitrite by the enzyme ammonia monooxygenase. The diversity of AOB is
suggested to influence nitrification rate. This research consists of three
parts. In the first part, the AOB diversity-nitrification rate relationship is
studied in different stand ages, in disturbed and undisturbed forests. Some
relevant soil characteristics such as pH, water content, organic matter, total
carbon and nitrogen will be measured, to analyse if they contribute to this
relationship. In addition, 15N methods will be applied to determine whether it
is possible to quantify exactly the differences between gross and net NO3
production. The second part will be focused on testing the hypothesis of a
positive relation between bacterial density and ecosystem process rate. In the
third part, the diversity-dependence of ecosystem properties such as
nitrification rate and stability (resistance and resilience) will be tested by
exposing systems to disturbances.

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