Decomposition of [14C]Lignocelluloses of Spartina alterniflora and a Comparison with Field Experiments
Decomposition of [14C]Lignocelluloses of Spartina alterniflora and a Comparison with Field Experiments
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互花米草[14C]木质纤维素的分解及与田间试验的比较
DOI：
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发表时间：
1985
影响因子：
4.4
通讯作者：
John O. Wilson
中科院分区：
文献类型：
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作者：
John O. Wilson
使用 14C 标记的化合物测量盐沼沉积物中互花米草木质纤维素的分解。孵化前 4 天分解速度最快，随后逐渐下降。侧链标记的木质素矿化速度略快于均匀标记的木质素； 12%的[侧链-14C]木质素标记的木质纤维素在培养816小时后被矿化，而在此期间只有8%的[U-14C]木质素标记的木质纤维素被降解。木质纤维素复合物内的碳水化合物部分的降解速度比木质素部分快约四倍；培养 816 小时后，29% 至 37% 的碳水化合物部分已被矿化。对互花米草凋落物中木质素和纤维素浓度的变化进行了长达两年的腐烂跟踪。纤维素从垃圾中消失的速度比木质素更快； 130 天后，纤维素初始含量损失了 50%，而木质素需要 330 至 380 天才能损失 50%。与其他凋落物成分相比，木质素的缓慢损失导致凋落物中木质素含量逐渐富集。沼泽沉积物中[14C]木质纤维素的矿化速率与沼泽枯落物中木质纤维素的分解速率相似。
Decomposition of lignocelluloses from Spartina alterniflora in salt-marsh sediments was measured by using 14C-labeled compounds. Rates of decomposition were fastest in the first 4 days of incubation and declined later. Lignins labeled in side chains were mineralized slightly faster than uniformly labeled lignins; 12% of the [side chain-14C]lignin-labeled lignocellulose was mineralized after 816 h of incubation, whereas only 8% of the [U-14C]lignin-labeled lignocelluloses were degraded during this period. The carbohydrate moiety within the lignocellulose complex was degraded about four times faster than the lignin moiety; after 816 h of incubation, 29 to 37% of the carbohydrate moiety had been mineralized. Changes in concentration of lignin and cellulose in litter of S. alterniflora were followed over 2 years of decay. Cellulose disappeared from litter more rapidly than lignin; 50% of the initial content of cellulose was lost after 130 days, whereas lignin required 330 to 380 days for 50% loss. The slow loss of lignin compared with other litter components resulted in a progressive enrichment of litter in lignin content. The rates of mineralization of [14C]lignocelluloses in marsh sediments were similar to the rates of lignocellulose decomposition in litter on the marsh.