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邵蕊,赵苗苗,赵芬,沈瑞昌,刘丽香,张丽云,徐明.施肥对油茶园土壤呼吸和异养呼吸及其温度敏感性的影响.生态学报,2018,38(7):2315~2322 本文二维码信息
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施肥对油茶园土壤呼吸和异养呼吸及其温度敏感性的影响
Effects of fertilization on soil respiration, heterotrophic respiration, and temperature sensitivity in an oil tea plantation
投稿时间:2017-03-27  修订日期:2017-11-14
DOI: 10.5846/stxb201703270531
关键词油茶园  施肥  土壤呼吸  土壤异养呼吸  温度敏感性
Key Wordsoil tea plantation  fertilization  soil respiration  soil heterotrophic respiration  temperature sensitivity
基金项目国家重点基础研究发展计划项目(2012CB417103);四川省林业厅项目(2009-204)
作者单位E-mail
邵蕊 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室, 北京 100101
中国科学院大学, 北京 100049 
 
赵苗苗 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室, 北京 100101
中国科学院大学, 北京 100049 
 
赵芬 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室, 北京 100101
中国科学院大学, 北京 100049 
 
沈瑞昌 南昌大学生命科学研究院流域生态学研究所, 南昌 330031  
刘丽香 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室, 北京 100101  
张丽云 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室, 北京 100101  
徐明 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室, 北京 100101 mingxu@igsnrr.ac.cn 
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摘要:
油茶是中国南方重要的木本食用油料树种,研究施肥对油茶园土壤呼吸及其温度敏感性的影响,对于估算中国南方典型种植园林温室气体排放及其对气候变化的响应具有重要意义。设置对照(CK)、施肥(OF)、断根(CK-T)和断根施肥(OF-T)4个处理,采用静态箱-气相色谱法,通过多年观测,分析探讨施肥对油茶园土壤呼吸和异养呼吸及其温度敏感性的影响。结果表明:(1)施肥对油茶园土壤呼吸和异养呼吸无显著影响。研究期间,各处理(OF、CK、OF-T、CK-T)土壤CO2通量依次为(77.91±2.59)、(73.71±0.97)、(66.82±1.02)mg C m-2 h-1和(66.84±3.94)mg C m-2 h-1;(2)各处理土壤呼吸温度敏感性(Q10)表现为OF-T(1.96±0.01) > CK-T(1.79±0.03) > OF(1.77±0.01) > CK(1.75±0.03),其中,OF-T处理下Q10显著高于其他3个处理,即施肥显著增加了断根处理土壤呼吸Q10;(3)施肥显著增加了土壤表层NH4+-N和NO3--N含量,Q10与土壤表层NH4+-N和NO3--N含量表现出显著的正相关关系。
Abstract:
As the largest carbon pool of terrestrial ecosystems, soils constitute important sources and sinks of global CO2 balance. Soil respiration is an important pathway of carbon fluxes between the atmosphere and terrestrial ecosystems. Further, soil respiration can also influence terrestrial carbon cycling through climate feedbacks, specifically temperature sensitivity (Q10). Oil tea (Camellia oleifera) is an important native woody oil crop, and has been widely developed in south China in recent years. High-level fertilization has been widely adopted to increase growth of oil tea trees and maintain soil fertility. In this study, the effects of fertilization on soil respiration, heterotrophic respiration and temperature sensitivity in an oil tea plantation were examined. Static chambers and gas chromatography were used to collect and analyze gas samples. To differentiate soil respiration and soil heterotrophic respiration, the trenching method was used. There were four treatments in this study:oil tea plots with fertilization (OF), oil tea plots without fertilization (CK), trenching plots with fertilization (OF-T), and trenching plots without fertilization (CK-T). The results showed that fertilization had no significant effects on either soil respiration or heterotrophic respiration. Soil CO2 effluxes in different treatments (OF, CK, OF-T, CK-T) were 77.91±2.59, 73.71±0.97, 66.82±1.02, and 66.84±3.94 mg C m-2 h-1, respectively. The temperature sensitivity of soil CO2 effluxes was 1.77±0.01, 1.75±0.03, 1.96±0.01, 1.79±0.03 in OF, CK, OF-T, and CK-T respectively. Fertilization significantly increased temperature sensitivity of soil heterotrophic respiration, with the Q10 values in the OF-T plots significantly higher than those in the CK-T plots. In addition, fertilization significantly increased soil NH4+-N and NO3--N contents in the surface layer (0-10cm). We also found significant linear relationships between the Q10 of soil CO2 effluxes and soil NH4+-N, as well as NO3--N contents. Our findings may provide basic data for greenhouse gas inventories and understanding their responses to climate change in a typical cash crop plantation in south China.
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