杉木不同经营方式的经济与养分利用效益分析

在立地指数级为16的杉木林内共设置12个固定样地,经过30年系统观察,对杉木传统经营方式和大径材经营方式的经济与养分利用效益进行比较分析。结果表明:在30年内,传统经营方式经营1.5个轮伐期,产木材558.371 m3/hm2,收益702 156元/hm2,木材效益1 258元/m3;需要造林2次,前期成本26 182元/hm2,后期成本268 018元/hm2;经营净收益为407 956元/hm2。大径材经营方式经营1个轮伐期,木材效益达到1 786元/m3;前期、后期经营成本分别为传统经营方式的50%、76.9%,经营净收益高于传统经营方式34.3%。传统经营方式1.5个轮伐期内消耗氮、磷、钾、钙、镁总量为1 110 kg/hm2,而大径材经营方式养分消耗为传统经营方式50%,单位养分利用效益是传统经营方式的2.7倍,达到989元/kg。

Analysis on efficiency of the economy and nutrition utilization on different mode of operation of Chinese fir

12 plots of Chinese fir forest,which site index was 16,were investigated to analyze the efficiency of the economy and nutrient utilization on different mode of operation,i.e.traditional mode of operation and the big-diameter wood mode of operation,after 30 years systematic observation.The results showed as following： Due to the traditional mode of operation had 1.5 rotation which afforested 2 times during the whole 30 years,the timber yield was 558.371 m3 / hm2,and the income was 702 156 yuan/hm2,so the wood benefits reached to 1 258 yuan/m3.The upfront and anaphase cost were 26 182 yuan/hm2,268 018 yuan/hm2,respectively,and the net income was 407 956 yuan/hm2.However,the big-diameter wood mode of operation had 1 rotation,the timber yield was 1 786 yuan/m3,the upfront and anaphase cost reduced to 50%,76.9% of traditional mode of operation,respectively.The net income was 34.3% over the traditional mode of operation.The total consumption of the traditional mode of operation of nitrogen,phosphorus,potassium,calcium and magnesium was 1 110 kg/hm2 during the 1.5 rotation,while the big-diameter wood mode of operation reduced to 50% of the traditional mode of operation,the unit nutrient utilization was 989 yuan/kg,which was 2.7 times of the traditional mode of operation.