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丘清燕,姚快乐,刘骏,葛志强,许文斌,刘红晓,胡亚林.易分解有机碳对不同恢复年限森林土壤激发效应的影响.生态学报,2019,39(13):4855~4864 本文二维码信息
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易分解有机碳对不同恢复年限森林土壤激发效应的影响
Effects of labile organic carbon input on the priming effect along an ecological restoration gradient
投稿时间:2018-05-04  修订日期:2019-03-06
DOI: 10.5846/stxb201805040995
关键词易分解有机碳  激发效应  土壤氮素可利用性  生态恢复  林龄
Key Wordslabile organic carbon  priming effect  soil N availability  ecological restoration  stand age
基金项目福建省教育厅中青年教师教育科研项目(JAT170188);福建省科技厅自然科学基金项目(2018J05047);国家自然科学基金项目(41703066);中国科学院退化生态系统植被恢复与管理重点实验室开放基金资助项目(Y821161001-DE2018025)
作者单位E-mail
丘清燕 福建农林大学林学院森林生态稳定同位素研究中心, 福州 350002  
姚快乐 福建农林大学林学院森林生态稳定同位素研究中心, 福州 350002  
刘骏 福建农林大学林学院森林生态稳定同位素研究中心, 福州 350002 ljaim99@163.com 
葛志强 福建农林大学林学院森林生态稳定同位素研究中心, 福州 350002  
许文斌 福建农林大学林学院森林生态稳定同位素研究中心, 福州 350002  
刘红晓 中国科学院华南植物园, 中国科学院退化生态系统植被恢复与管理重点实验室, 广州 510650  
胡亚林 福建农林大学林学院森林生态稳定同位素研究中心, 福州 350002  
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摘要:
土壤有机碳库作为陆地生态系统最大的碳库,其微小的改变都将引起大气CO2浓度的急剧改变。易分解有机碳的输入可以通过正/负激发效应加快/减缓土壤有机碳(SOC)的矿化,并最终影响土壤碳平衡。以长汀县不同恢复年限森林(裸地、5年、15年、30年马尾松林以及天然林)土壤为研究对象,通过室内培养向土壤中添加13C标记葡萄糖研究易分解有机碳输入对不同恢复阶段森林土壤激发效应的影响。研究结果表明,易分解有机碳输入引起的土壤激发效应的方向和强度因不同恢复阶段而异。易分解有机碳输入的初期对各恢复阶段森林土壤均产生正的激发效应,然而随着时间的推移,15年、30年马尾松林以及天然林相继出现负的激发效应。从整个培养期(59 d)来看,易分解有机碳的输入促进了裸地与5年生马尾松林土壤有机碳的矿化,有机碳的矿化量分别提高了131%±27%与25%±5%;但是减缓了15年生马尾松林土壤有机碳的矿化,使其矿化量减少了10%±1%;然而,易分解有机碳输入对30年生马尾松林及天然林土壤有机碳的矿化则无明显影响。土壤累积激发碳量与葡萄糖添加前后土壤氮素的改变百分比呈显著正相关关系(R2=0.44, P < 0.05),表明易分解有机碳输入诱导的土壤激发效应受土壤氮素可利用性的调控,土壤微生物需要通过分解原有土壤有机碳释放的氮素来满足自身的需求。
Abstract:
The soil organic carbon (SOC) pool is the largest carbon pool in terrestrial ecosystems, and a small change in the pool will result in a great change in atmospheric CO2 concentration. The input of labile organic carbon will accelerate or mitigate the mineralization of SOC through a positive or negative priming effect and eventually affect soil carbon balance. In the present study, we sampled forest soils at different restoration years from Changting County, Fujian Province, and added 13C-labeled glucose to those soils to investigate the impact of labile organic carbon input on the priming effect. The results showed that the direction and magnitude of the priming effect induced by the input of labile organic carbon were dependent on the restoration age. A positive priming effect was observed immediately after the application of labile organic carbon. However, a shift from positive priming effect to negative effect occurred in the 15- and 30-year-old Pinus massoniana forests as well as natural forest with time. Throughout the experiment (59 days), the input of labile organic carbon accelerated the mineralization of SOC in the bare soil and 5-year-old Pinus massoniana forest. The amount of SOC-derived CO2 emissions increased by about 131% ±27% and 25% ±5%, respectively. However, the input of labile organic carbon declined by about 10% ±1% of SOC mineralization in the 15-year-old Pinus massoniana forest, and it had no significant effects on SOC mineralization in the 30-year-old Pinus massoniana forest and natural forest. The cumulative priming effect was positive correlated with the cumulative percent change in soil available N due to glucose addition during the 59 days of incubation. This indicates that the priming effect induced by the labile organic carbon input is governed by soil N availability, and microbes increased SOC mineralization to meet the N requirement.
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