摘要
土壤微生物残留物是稳定性碳库的重要组分,然而固氮树种引入对落叶松人工林土壤团聚体微生物残留物分布的影响还不清楚.为了阐明固氮树种对不同团聚体粒级内微生物残留物分布的影响,本研究以氨基糖作为微生物残留物的生物标识物,比较了辽东日本落叶松人工纯林和落叶松与固氮树种赤杨混交林土壤团聚体氨基糖的分布特征.结果表明:赤杨引入不影响团聚体氨基糖的分布,但显著提高了团聚体氨基糖含量.与纯林相比,混交林土壤不同团聚体各粒级总氨基糖含量增加1.3~1.7倍.其中,混交林土壤团聚体内总氨基糖增加量的66.5%~66.9%来自氨基葡萄糖,30.0%~30.6%来自氨基半乳糖,2.5%~3.2%来自胞壁酸.赤杨引入显著提高了>2000μm和<250μm团聚体中的氨基葡萄糖/胞壁酸值,但不影响250~2000μm粒级团聚体中真菌和细菌残留物的相对贡献.此外,赤杨引入增加了土壤不同团聚体内的氨基糖对土壤有机碳的贡献,但不影响团聚体粒级之间的微生物贡献,说明赤杨对微生物贡献的影响存在空间均一性.
Soil microbial residues are important components of soil stable carbon（ C） pools. How N-fixing tree species influence microbial residues in soil aggregates in larch plantations is still unclear. To determine the effects of N-fixing tree species on the distribution of microbial residues in different aggregates,we compared the distribution of amino sugars,biomarker of microbial residues,among aggregates in a pure larch（ Larix kaempferi） plantation and a mixed plantation of larch（ Larix kaempferi） and alder（ Alnus sibirica） in eastern Liaoning Province. The results showed that alder did not affect the distribution of amino sugars,but significantly increased amino sugars content in soil aggregates. The total amino sugars in different soil aggregates were enriched by 130%-170%in the mixed larch plantation compared with those in pure larch plantation. The contributions of glucosamine,galactosamine and muramic acid to the increases of total amino sugars caused by alder introduction were 66.5%-66.9%,30.0%-30.6% and 2.5%-3.2%,respectively. Alder introduction significantly accelerated the glucosamine/muramic acid ratios in 2000 μm and 250 μm aggregates,but not in 250-2000 μm aggregates. Moreover,alder introduction increased the microbial contribution to soil organic C in all aggregates,but did not influence this contribution among aggregates,indicating that the effects of alder introduction on microbial contribution to aggregates were homogeneous.
作者
井艳丽
刘世荣
殷有
姚荣生
张少强
毛日昕
JING Yan-li;LIU Shi-rong;YIN You;YAO Rong-sheng;ZHANG Shao-qiang;MAO Ri-xin(Shenyang Agricultural University, Shenyang 110866, China;State Forestry Administration Key Laboratory of Forest Ecology and Environment, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Belting 100091, China;Liaoning Provincial Institute of Forest Management, Dandong 118002, Liaoning , China;Forestry Beureau of Benxi Manchu Autonomous County, Benxi 117100, Liaoning , China）.)
出处
《应用生态学报》
CAS
CSCD
北大核心
2018年第6期1753-1758,共6页
Chinese Journal of Applied Ecology
基金
国家科技支撑计划项目(2015BAD07B030103)资助
关键词
落叶松
团聚体
氨基糖
固氮树种
Larix kaempferi
aggregate
amino sugars
N-fixing tree species.
