子午岭地区辽东栎林生物生产量的研究

Study on Biomass and Productivity of Quercus lidotungensis Stands in Ziwuling Forest Region of Shaanxi Province

对子午岭地区辽东栎林生物生产量的测定分析结果表明:林分总生物量为41.456t/ha。其中乔木层、林下植物层和枯枝落叶层的生物量分别是32.799、1.410和7.247t/ha,或约占林分总生物量79.1、3.4和17.5％。林分乔木层干物质和材积年平均净生产量为1.397t/ha.a和0.879m^3/ha.a;干物质和材积的现实生产量为4.259t/ha.a和1.700m^3/ha.a。阴坡土层厚(>30cm)且湿润同阳坡土层浅薄干燥的生境条件对比表明,前者比后者有较高的林分生物量和生产量。光能利用率(辽东栎林大约为0.29％)评价表明;与其它地区相比,该地区辽东栎林的光合生产力是比较低的。因此,改善辽东栎林的经营管理十分重要。

Describes the biomass and productivity of the secondary forest of Quercus liaotungensis in Ziwuling forest region of Shaanxi p'rovince.The average biomass of these stands amounts to 41.456 t/ha,in which the biomass of arbor layer litterfall and undergrowth were 32.799, 7.247 and 1.41Qt/ha or 79.1,17.5 and 3.4% of the total stands, respectively .Annual mean dry weight and volume production in arbor layer were 1.397t/ha.a and 0.879m3/ha.a,respectively and the current dry matter and volume production were 4.259t/ha.a and 1.700m3/ ha.a,respectively.Higher biomass and productivity of the stands in north slope (depth of soil layer>30cm)is occurred in comparison with that of the south slope.The photosynthetic productivity in this region evaluated by utilization efficiency of solar energy (about 0.29% in Quercus liaotungensis stands) is comparatively lower than other regions.