不同年龄巨桉人工林枯落物和细根碳储量研究  

Preliminary Studies on Carbon Reserves of Litterfall and Fine Root in an Age Series of Eucalyptus grandis Plantation

作　　者：袁渭阳[1] 李贤伟[1] 张健[1] 荣丽[1] 

机构地区：[1]四川农业大学生态林业工程省级重点实验室,四川雅安625014

出　　处：《林业科学研究》2009年第3期385-389,共5页Forest Research

基　　金：国家自然科学基金项目(30771717;30872014);国家"十一五"科技支撑项目(2006BAC01A11);教育部重点学科博士点基金(20050626001);四川省教育厅重点实验室项目(2006ZD006)共同资助

摘　　要：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。As the two primary mechanisms existed by which organic matter and nutrients were returned to the soil, litter and fine root had been attracted more attentions over twenty years. Much debate has taken place on whether above-or below-ground primary production contributes more carbon to the soil. But up to now, few studies focused on the soil organic layer carbon variation of Eucalyptus grandis, especially in the forestland converted from farmland, which is difficult to meet the needs of plantation management in regeneration of degraded crop ecosystem and the discussion of belowground structure and functional processes in the field of carbon cycle or energy flux. Litterfall and fine root carbon were measured for an age series of E. grandis in Danling county of Sichuan Province, using Space-for-Time approach. Litterfall carbon reserves of E. grand/s ranged from 0.641t·hm^-2 in one-year old forest to 6. 648t·hm^-2 in six-year old forest. However, there was a low storage of litter in the mid-age （3 or 4 years） of E. grandis. Fine root carbon reserves of E. grand/s ranged from 0. 101t·hm^-2 to 0. 637t·hm^-2 approximately with the same trend of the storage of litter, but fine root carbon reserve was consistent with fine root biomass.

关 键 词：巨桉 枯落物 细根 碳储量 年龄 

分 类 号：S718.55[农业科学—林学]