Inter-annual variations of net ecosystem productivity of a primeval tropical forest basing on a biometric method with a long-term data in Pasoh, Peninsular Malaysia

• Yoneda Tsuyoshi

  Faculty of Agriculture, Kagoshima University

• Mizunaga Hiromi

  Faculty of Agriculture, Shizuoka University

• Uchimura-Tashiro Yoshihiko

  Kagoshima Pref. Forestry Technology Center

• Niiyama Kaoru

  Forestry and Forest Products Research Institute

• Sato Tamotsu

  Forestry and Forest Products Research Institute

• Kosugi Yoshiko

  Graduate School of Agriculture, Kyoto University

• Takanashi Satoru

  Forestry and Forest Products Research Institute

• Tani Makoto

  Graduate School of Agriculture, Kyoto University

• Okuda Toshinori

  Graduate School of Integrated Arts and Sciences, Hiroshima University

• Kadir Wan Rashida Wan

  Forest Research Institute of Malaysia

• Kassim Abd. Rahman

  Forest Research Institute of Malaysia

Abstract

Inter-annual variability of net ecosystem productivity (NEP) was assessed by a biometric method observing dynamics of coarse woody organs in a primeval lowland tropical rain forest in Pasoh, Peninsular Malaysia. Yearly changes of NEP estimated by biometric method well agreed with those measured by Eddy Covariance Method (ECM), when we observed a stand within a distance of 125‐150m from the tower for ECM. Annual NEP at a 2-ha stand ranged from -5.0t Carbon ha^-1 y^-1 to 2.1t Carbon ha^-1 y^-1 during the last 43 years (1969-2012) with two times depressions. They were caused by man-made and natural disturbances that affected as much as 10% of the 2-ha stand area, and negative NEP was maintained during around 10 years after disturbances. Inter-annual variances of NEP, biomass and necromass of coarse woody debris were evaluated by a mathematical simulation with observed properties of net primary productivity and a death rate of coarse woody organs. Simulated NEP was 0.00±1.52t C ha^-1 y^-1 under equilibrium regimes, and the variance increased under the conditions of a higher mean death rate leading to decrease of biomass. Basing on variances of NEP, we estimated a turnover time of an equilibrium system at 400 years for a 2-ha stand, which is equivalent to 800ha in area.

Journal

• Tropics

  Tropics 25 (1), 1-12, 2016

  JAPAN SOCIETY OF TROPICAL ECOLOGY

Keywords

• carbon cycling
• coarse woody debris
• inter-annual variations
• <i>NEP</i>
• tropical rain forest

Details

• CRID: 1390001204422753792
• NII Article ID: 130005154749
• NII Book ID: AN10528811
• DOI: 10.3759/tropics.25.1
• ISSN: 18825729
• ISSN: 0917415X
• NDL BIB ID: 027458660
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I027458660
• Web Site: https://www.jstage.jst.go.jp/article/tropics/25/1/25_1/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed