长白山北坡暗针叶林倒木贮量和分解的研究

对长白山北坡海拔 12 6 0m和 16 2 0m暗针叶林中倒木蓄积、生物量和倒木的分解进行了比较研究 ,结果表明 ,暗针叶林中倒木的蓄积为 180 .87m3·hm-2 ,占林分蓄积的 2 1.83 % .低海拔的倒木蓄积和生物量均比高海拔的低 ,海拔 12 6 0m的倒木蓄积为 5 2 .5 7m3·hm-2 ,生物量为 2 6 .2 1t·hm-2 ;海拔 16 2 0m的倒木蓄积为 193.85m3·hm-2 ,生物量为 5 3 .33t·hm-2 .用单项指数衰减模型对倒木的分解进行模拟可知 ,倒木的分解常数随树种和海拔高度的不同而不同 .冷杉倒木的分解常数比云杉倒木大 ;倒木在低海拔的分解常数比在高海拔的大 ,表明云杉倒木完全分解需要较长的时间 .

Storage and decomposition of fallen wood in dark coniferous forest on the North Slope of Changbai Mountain

The storage, biomass, and decomposition of fallen woods in dark coniferous forest on the north slope of Changbai Mountain at elevations of 1260 m and 1620 m were studied. The results showed that the volume of fallen woods was 180.87 m3.hm-2, occupying 21.83% of the stand volume. The volume and biomass of fallen woods at elevation of 1260 m were higher than those at 1620 m. The volume of fallen woods was 52.57 m3.hm-2 at 1260 m, and was 193.85 m3.hm-2 at 1620 m, and their biomass was 6.21 t.hm-2 at 1260 m, and was 53.33 t.hm-2 at 1620 m. Monomial exponential attenuation model could be used to simulate the decomposition process of fallen woods. The results indicated that the decomposition constants of fallen woods were different among different tree species and different elevations. The decomposition constant of fallen woods of Abies was higher than that of Picea, and was higher at 1260 m than at 1620 m. The results also showed that the decomposition of Picea lasted longer.