| dc.description.abstract | The existing National Forest Inventory (NFI) system of Indonesia provides forest
resource data on state forested lands only. Meanwhile, the Government Regulation No.
23/2021 provided a mandate to the Ministry of Environment and Forestry (MoEF) to
conduct NFI not only at state forests, but also at customary forests and private/community
forests. This new mandate requires a new sampling design for conducting NFI at
customary and community forests, which are collectively named as Trees Outside Forest
(TOF) lands. This study was therefore aimed at proposing an appropriate sampling design
for TOF lands.
This study was conducted by first discussing relevant criteria for defining TOF lands
with the MoEF and other related parties. The main sampling design components, i.e.,
cluster-plot design and sample size (number of cluster-plot), were determined based on
available community forest inventory data in Java. The TOF cluster-plot was designed to
consist of three sample plots, in which each sample plot consists of three nested-plots that
would provide fairly balanced contributions of small, medium, and large trees when
estimating stand attributes. Appropriate number of cluster-plot was determined based on
variation coefficients of stand attributes and targeted precision (i.e., allowable sampling
error). In the final step, the proposed sampling design was tested at TOF lands in West
Kalimantan and West Java.
Based on discussions with relevant parties, this study defined a TOF land as "a land
classified as pure dry agriculture, mixed dry agriculture, dry shrub, or wet shrub
according to the Indonesian land cover system with minimum area of 0.25 ha with trees
higher than 5 m and canopy cover more than 10%”. Appropriate cluster-plot for TOF land
inventory consisted of three plots with a distance of 50 m. Each plot consisted of three
nested subplots with a radius of 5 m for small trees with 5≤DBH<20 cm, a radius of 15 m
for medium trees with 20≤DBH<35 cm, and a radius of 25 m for large trees with DBH≥35
cm. The pilot testing in West Kalimantan and Java confirmed that such cluster-plot design
enable the field measurement of a cluster-plot within one day. To conduct NFI at TOF lands
with a sampling error of 15%, this study recommended 70 cluster-plots for each island in
Indonesia. The MoEF, however, might then adjust the number of cluster-plots by
considering available budget and targeted precision for TOF lands inventory. | id |
