Determining Growing Space of Perhutani's Teak Plus Plantation in Madiun, Saradan and Ngawi Forest District, East Java, Indonesia

Sadono, Ronggo
July 2014
Australian Journal of Basic & Applied Sciences;Jul2014, Vol. 8 Issue 10, p426
Academic Journal
Tree improvement plays an important role to accelerate teak forest productivity in shorter rotation. The Indonesian state forest enterprise (Perum Perhutani) gained high value of genetic material as a result of teak progeny trial series. This genetic material was branded as Perhutani's Teak Plus or Jati Plus Perhutani (JPP). JPP from clonal seed orchards was planted throughout Perum Perhutani area in 2002 until 2007 in a 3 × 3 m initial spacing arrangement. To estimate future JPP growth, it is important to provide growing space reference. This research aimed to determine growing space based on dominant JPP trees from clonal seed orchards and to estimate diameter and height growth performance. The research was conducted at JPP plantation compartments from clonal seed orchards at Madiun, Saradan and Ngawi forest districts. These compartments have been evaluated based on remaining tree number, average stem diameter and average tree height. Compartments with very good or good rank, have good accessibility, and represent age variation (6 to 11 years) in selected were as samples. In each selected compartments, 30 dominant, good quality and healthy trees were measured their diameter, height and crown projection. Crown projection data was used to determine growing space. Regression analysis was used to predict diameter and height growth. The results showed that growing space for 6 and 7 years old JPP plantation was amounted to 11.68 m2, lower than 13.37 m2 growing space provided. At age class of 8 to 11 years, the provided growing space was insufficient because the observed growing space at that age class increased to 15.08 m2. The remaining number of stem for 6 and 7 year with quadratic arrangement was larger than reference stem numbers, but with hexagonal arrangement of 777 was lower than the reference. At age 8 to 11 year, the reference stem numbers was lower than both for quadratic and hexagonal arrangement. Growth equation was best model to predict growth development for both stem diameter and total tree height.


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