去除根系和凋落物对滨海沙地3种防护林土壤碳氮库的短期影响

发布时间：2018-01-24 12:10

本文关键词： 土壤碳氮储量土壤可溶性有机碳氮土壤微生物量碳氮去除根系去除凋落物滨海沙地　出处：《生态学报》2017年12期 　论文类型：期刊论文

【摘要】：以福建长乐滨海沙地上3种人工林(尾巨桉、纹荚相思、木麻黄)土壤为研究对象,设置去除凋落物、去除根系和对照3种处理,观测1年后分析改变地上、地下有机质输入对沙地土壤碳氮储量、可溶性有机碳(DOC)氮(DON)和微生物量碳(MBC)氮(MBN)的影响。结果表明:不同树种人工林间土壤碳氮储量无显著差异;不同树种人工林间土壤活性碳氮组分差异显著,木麻黄土壤DOC含量显著高于纹荚相思,纹荚相思土壤DON显著高于木麻黄和尾巨桉,尾巨桉土壤MBN显著高于木麻黄和纹荚相思。改变地上地下有机质输入对滨海沙地土壤碳氮库有显著影响且这种影响随树种而异。去除凋落物后纹荚相思、木麻黄土壤碳储量分别下降38.0%、25.1%,氮储量分别下降12.9%、12.5%;去除凋落物后尾巨桉、纹荚相思、木麻黄土壤DOC分别下降37.5%、30.6%、52.9%,MBC分别下降31.0%、56.9%、29.7%,MBN分别下降50.7%、34.9%、42.2%;去除根系后尾巨桉、纹荚相思土壤MBC分别下降57.7%、15.4%。回归分析显示,滨海沙地土壤DOC、MBC与土壤碳储量呈显著正相关,土壤DOC和MBC分别能够解释土壤碳储量变化的47.7%和57.7%。研究表明:树种通过调控地上、地下输入影响可溶性有机碳氮和微生物量碳氮,进而影响土壤碳氮库。
[Abstract]:Three artificial forests (Eucalyptus urophylla, Acacia acacia, Casuarina equisetifolia) on coastal sandy land of Changle, Fujian Province were studied. Litter removal, root removal and control were set up to analyze and change the ground after one year observation. Soil carbon and nitrogen storage in sandy land by underground organic matter input. The effects of soluble organic carbon (DOC) nitrogen (DOC) and microbial biomass (MBC) nitrogen (MBN) were studied. The results showed that there was no significant difference in soil carbon and nitrogen storage among different tree species. The content of DOC in soil of Casuarina equisetifolia was significantly higher than that of Acacia acacia, and the DON in soil of Acacia equisetifolia was significantly higher than that of Casuarina equisetifolia and Eucalyptus grandis. The soil MBN of Eucalyptus grandis was significantly higher than that of Casuarina equisetifolia and Acacia acacia. Changing the above ground organic matter input had a significant effect on soil carbon and nitrogen pool in coastal sandy land and the effect varied with tree species. Soil carbon storage of Casuarina equisetifolia decreased by 38.0% and 25.1%, and nitrogen storage decreased by 12.9% and 12.5%, respectively, in Casuarina equisetifolia soil. The DOC of Eucalyptus grandis, Acacia acacia and Casuarina equisetifolia soil decreased by 37.5% and 30.6%, 52.9% respectively. MBN decreased 50.7% and 34.9%, 42.2%; After removing root system, the MBC of Acacia acacia soil decreased 57.7% and 15.4%, respectively. Regression analysis showed that there was a significant positive correlation between soil MBC and soil carbon storage in coastal sandy land. Soil DOC and MBC could explain the variation of soil carbon storage by 47.7% and 57.7 respectively. The results showed that the tree species affected soluble organic carbon nitrogen and microbial biomass carbon nitrogen by controlling the aboveground and underground input. And then affect the soil carbon and nitrogen pool.
【作者单位】：福建农林大学林学院;国家林业局杉木工程技术研究中心;福建师范大学地理科学学院;湿润亚热带山地生态国家重点实验室培育基地;福建农林大学园艺学院;福建省长乐大鹤国有防护林场;
【基金】：国家自然科学基金项目(31570604,41371269) 福建省林业科技项目(闽林科[2012]3号) 福建农林大学部级创新平台资助
【分类号】：S714
【正文快照】： 1福建农林大学林学院,福州3500022国家林业局杉木工程技术研究中心,福州3500023福建师范大学地理科学学院,福州3500074湿润亚热带山地生态国家重点实验室培育基地,福州3500075福建农林大学园艺学院,福州3500026福建省长乐大鹤国有防护林场,长乐350212Short-term effects of ro

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