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不同年龄巨枝人工林枯落物和细根碳储量研究

Keywords: 巨桉,枯落物,细根,碳储量,年龄

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Abstract:

以巨桉工业人工林为对象,采用“空间换时间法”,研究一个轮伐期巨桉林枯落物和细根碳储量,结果表明,1~6年生巨桉林枯落物碳储量为0.641~6.648t·hm^-2,不同年龄巨桉林枯落物碳储量1年为2.263±1.022t·hm^-2,2年为3.414±1.873t·hm^-2,3年为2.270±1.262t·hm^-2,4年为2.305±1.664t·hm^-2,5年为3.011±1.630t·hm^-2,6年为4.139±2.509t·hm^-2,6年生巨桉林枯落物碳储量最大。枯落物凋落量在年龄序列中表现为“高一低一高”的趋势;1~6年生巨桉林细根碳储量为0.101~0.637t·hm^-2,不同年龄巨桉细根碳储量1年为0.318±0.109t·hm^-2,2年为0.308±0.139t·hm^-2,3年为0j255±0.154t·hm^-2,4年为0.263±0.076t·hm^-2,5年为0.390±0.128t·hm^-2,6年为0.438±0.199t·hm^-2,6年生巨桉林细根碳储量最大,3、4年生较小,这与细根生物量的年龄变化趋势相一致。

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