秦岭林区天然油松、锐齿栎林细根周转过程与能态变化  

TURNOVER PROCESS AND ENERGY CHANGE OF FINE ROOTS OF PINUS TABULAEFORMIS AND QUERCUS ALIENA VAR.ACUTESERRATA NATURAL FORESTS IN QINLING MOUNTAINS

作　　者：刘建军[1] 王得祥[1] 雷瑞德[1] 吴钦孝[1] 

机构地区：[1]西北农林科技大学,杨凌712100

出　　处：《林业科学》2002年第4期1-6,共6页Scientia Silvae Sinicae

基　　金：国家林业局九五重点项目 (96 3 0 )。

摘　　要：对秦岭林区天然油松、锐齿栎林细根周转过程的能量变化规律进行了系统研究 ,结果表明 :细根在分解过程中 ,能量的损失符合指数衰减规律 ,锐齿栎的分解系数为 0 0 0 31,年周转率为 0 35次·a- 1 ;油松分解系数为 0 0 0 2 4 ,年周转率为 0 4 8次·a- 1 ;油松林活细根年均储存能量为 119 4 3× 10 6 kJ·hm- 2 ,年死亡损失能量为 2 1 84× 10 6 kJ·hm- 2 a- 1 ,相当于地上部分年凋落物损失能量的 31 7% ;锐齿栎林活细根年均储存能量为172 70× 10 6 kJ·hm- 2 ,死亡损失能量 5 8 31× 10 6 kJ·hm- 2 a- 1 ,相当于地上部分年凋落物损失能量的 6 2 8%。The energy variation pattern in the fine roots turnover process of Pinus tabulaeformis and Quercus aliena var. acuteserrata natural forests in Qinling mountains were studied systematically. The results showed that the energy loss was followed by an attenuation index pattern in the process of fine root decomposition. The decomposition coefficient of Quercus aliena var. acuteserrata forest was 0 0031 and its turnover rate was 0 35 time·a -1 . The decomposition coefficient of Pinus tabulaeformis forest was 0 0024 and its turnover rate was 0 48 time·a -1 . The average annual storage energy in living fine roots of Pinus tabulaeformis forest was 119 43×10 6?kJ·hm -2 and the average annual energy loss in dead fine roots was 21 84×10 6?kJ·hm -2 which was 31 7% of litter energy loss. Similarly, the average annual storage energy in living fine roots of Quercus aliena var. acuteserrata forest was 172 70×10 6?kJ·hm -2 and the average annual energy loss in dead fine roots was 58 31×10 6?kJ·hm -2 which was 62 8% of litter energy loss.

关 键 词：秦岭林区 周转过程 油松林 锐齿栎林 细根 能量变化 森林生态系统 

分 类 号：S718.554[农业科学—林学]