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Summary:

A study was done to examine the impact of stocking and age on the growth of Pinus plantations, established since 1978 and conservatively managed by FUGs in Sindhu Palchok and Kabhre Palanchok. P. roxburghii and P. patula were sampled over a range of stockings, ages and site qualities. Core samples were collected by taking samples (0.5cm in diameter) directly through the centre of each tree and a caliper was used to measure the increment for each year's growth.

The results clearly show that the annual increment of the older stands is stagnating due to their high stocking densities. Due to the proximity of the NACRMP districts to Kathmandu where there is a high market demand for sawlogs and sawn timber, and the relatively easy road access of a substantial area of the plantation resource, there is a significant lost opportunity cost by delaying thinning. This was valued at Rs 15-20.000 per annum. The paper presents a set of recommended thinning regimes for young and established plantations of P. roxburghii and P. patula for application in similar accessible plantation forest in the Mid Hills of Nepal.