Keywords :
Primary production,
plant communities
บทคัดย่อ :
The aboveground net primary production of plant communities in old-clearing areas, 2, 4, 7
and 10 years of age and dry evergreen forest at Sakaerat Environmental Research Station,
Pakthongchai, Nakhon Ratchasima, was investigated during August, 1978 to August, 1979. One
sample plot size 12 X 48 m.2 was established in each old-clearing area, while the other sample plot
size 50X50 m.2 was established in DEF stand, for studying DBH growth of trees over 4.5 cm. DBH
which were measured at two times. The first measurement was in August, 1978 and September,
1978 for DEF stand and old-clearing areas respectively, while the second measurement was in
August, 1979 for all stands. DBH dimension of each tree was used for estimating biomass of
individual tree from the already established allometric equations. In each sample plot was
subdivided into 36 sub-plots (4 X 4 m.2), 3 sub-plots were monthly random for studying biomass of
trees and shrubs under 4.5 cm. DBH. While the biomass of seedlings, herbs, climbers, and grasses
were investigated in sub-sub-plot (1 X 1 m.2) randomly located within each 4.4 m.2 plot. Biomass of
all plant types in this layer were estimated through the direct harvest method. Standing dead and
litter fall during the study period were also monthly collected in each 1 X 1 m2 plot. For estimating
biomass of undergrowth layers, each plant type was sorted into trees and shrubs under 4.5 cm.
DBH, climbers, herbs and grasses. In each type, fresh biomass was weighted separately into stem,
branch (or wood), leaf, and standing dead component. Sub-samples of each component in each
plant type were oven-dried weight basis. Rate of biomass increment, rate of biomass loss and net
primary production were investigated.
เอกสารอ้างอิง :
Issaree, M. (1982). Primary production of plant communities in old clearing areas at Sakaerat Environmental Research Station, Pak Thongchai, Nakhon Ratchasima (Doctoral dissertation, MS Thesis, Kasetsart University. (in Thai)). ### มีหนังสือ Scan
