Abstract:

Based on the data observed continuously in fixed positions, various benefit losses resulted from cutting the Chinese fir plantation were analized by isobenefit correlation substitution method. The Chinese fir plantation was located in Huitong County, Hunan Province. The results showed that compared with forest area, the amoun t of water storage in cutover area decreased 646 m³·hm^-2 The capacity of regulating flood in cutover area was 786 m³·hm^-2 less than that in forest area. The amount of water supply during water exhaustion in cutover area was 318m³·hm^-2 less than that in forest area. The amount of mud and sand losed every year in cutover area was 48t·hm^-2 more than that in forest area, which resulted in more nutrient substance losed from the cutover area each year, e.g. N 0.087 t·hm^-2, P 0.047t·hm², K 0.101 t·hm^-2. According to the relative calculation the annual benefit loss of water resource containment would be 849 yuan if one hectare of cut Chinese fir plantation which was cut, that of soil fixation and fertility would be 504 yuan, that of soil improvement 102 yuan, totally 1455 yuan. The reliable scientific basis was provided for rational utilization of forest resources and the evaluation of loss after cutting forest.

Key words: Chinese fir plantation, Cutting, The loss of benefit, Evaluation