เปรียบเทียบวิธี

	Forest Vegetation Simulator	ดัชนีความหนาแน่นของป่า (Stand Density Index - SDI)
สาขาวิชา	วนศาสตร์	วนศาสตร์
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1990	1933
ผู้ริเริ่ม	George Dixon	Louis Reineke
ประเภท	simulation system	density measurement
แหล่งต้นตำรับ	Dixon, G. E. (2002). Essential FVS: A User's Guide to the Forest Vegetation Simulator. USDA Forest Service Rocky Mountain Research Station General Technical Report RMRS-GTR-120.	Reineke, L. H. (1933). Perfecting a stand-density index for even-aged forests. Journal of Agricultural Research, 46(7), 627–638.
ชื่อเรียกอื่น	FVS, growth simulator	SDI, Reineke density index
ที่เกี่ยวข้อง	2	2
สรุป	The Forest Vegetation Simulator (FVS) is a widely used growth and yield model system developed by the USDA Forest Service that simulates tree and stand development over multiple decades. FVS uses individual-tree growth models (not stand averages) parameterized for different forest regions, allowing realistic simulation of mixed-species, uneven-aged, and disturbed forests. It is used operationally for harvest planning, fire modeling, wildlife habitat assessment, and management scenario evaluation across U.S. forests.	The Stand Density Index (SDI), introduced by Reineke in 1933, is a dimensionless measure of forest density that accounts for both tree number and size. It expresses the number of trees per hectare in a stand, adjusted to a reference quadratic mean diameter (QMD) of 25 cm, providing a standardized metric for comparing tree density across different forest types and sizes. SDI is widely used in forest management to assess stocking levels and to guide thinning decisions.