XIONG Yi,GUO Yancui,DONG Chunyu,et al.Influence of Fragmentation Degree on CO2 Release by Leaf Litter During Its Decomposition[J].Northern Horticulture,2020,44(24):82-89.[doi:10.11937/bfyy.20200304]
破碎程度对凋落物分解过程中CO2释放的影响
- Title:
- Influence of Fragmentation Degree on CO2 Release by Leaf Litter During Its Decomposition
- Keywords:
- fragmentation degree; leaf litter; CO2 release
- 文献标志码:
- A
- 摘要:
- 以黑龙江省齐齐哈尔市4种绿地植被凋落物为研究对象，进行不同程度破碎（<0.149 mm、0.149~1.000 mm、1.000~2.000 mm、2.000~10.000 mm）处理后，采用室内恒温培养、碱液吸收法测定1~160 d间4种植被凋落物4个破碎程度下CO2释放速率的变化，以期了解破碎程度对凋落物分解过程的影响。结果表明：4种植被凋落物总体表现为随破碎程度增加，CO2释放速率加快。不同破碎处理对阔叶凋落物CO2累积释放量影响显著（P<0.05），对针叶凋落物CO2累积释放量影响不显著（P>0.05）。不同破碎处理与阔叶凋落物在1~20 d间相关性显著（P<0.05）。凋落物在2~20 d间CO2释放速率与初始凋落物质量（理化性质）之间相关性显著（P<0.05）。上述结果表明破碎处理对阔叶凋落物CO2释放过程影响较大，破碎会导致其CO2释放速率增加，并随破碎程度加大而增高，但对针叶凋落物CO2释放过程影响仅在试验初期较明显；1.000 mm以下破碎处理凋落物CO2释放速率稳定性高，为今后室内试验提供参考依据。
- Abstract:
- To understand the influence of fragmentation degree on the leaf litter decomposition process,leaf litters from four kinds of greenbelt vegetationin Qiqihar city,Heilongjiang Province were broken to four different degrees (<0.149 mm,0.149-1.000 mm,1.000-2.000 mm,2.000-10.000 mm),respectively,to be used as research objects.Under the condition of indoor thermostatic culture,the variation in the CO2 release rate of the broken leaf litters in the period of 1-160 days was measured using the alkali absorption method.The results showed that,the CO2 release rate of leaf litters from four kinds of vegetation generally increases with an increasing fragmentation degree;the influence of fragmentation degree on the broad-leaved litter cumulative release of CO2 was significant (P<0.05),while that on the needle-leaved litter cumulative release of CO2 was not significant (P>0.05);the CO2 release rate of broad-leaved litter in the period of 1-20 days was strongly correlated with the fragmentation degree (P<0.05),and the CO2 release rate of leaf litters from the four kinds of vegetation in the period of 2-20 days was all strongly correlated with the initial litter quality (physicochemical property) (P<0.05).It can be concluded from the above results that the breakage treatment can significantly influence the whole CO2 release process of broad-leaved litter,leading to a higher rate of CO2 release,which increases with the fragmentation degree,but only has significant influence on the initial-stage CO2 release of needle-leaved litter;litters that were broken to the below 1.000 mm degree can end up releasing CO2 at a highly steady rate,which can be of reference value to the indoor laboratory tests in the future.
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备注/Memo
第一作者简介：熊毅（1980-），男，硕士，讲师，现主要从事城市绿地土壤生态等研究工作。E-mail：xiongyiabc@163.com.责任作者：郭彦萃（1980-），女，硕士，讲师，现主要从事城市绿地生态等研究工作。E-mail：shengmingbinfen@163.com.基金项目：齐齐哈尔大学大学生创新创业训练计划资助项目（201810232172）；黑龙江省省属本科高校基本科研业务费校地合作资助项目（135409502）。收稿日期：2020-01-20