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农牧交错区不同植物群落土壤呼吸的日动态观测与测定方法比较
引用本文:杨晶,黄建辉,詹学明,李鑫,杜丽华,李凌浩.农牧交错区不同植物群落土壤呼吸的日动态观测与测定方法比较[J].植物生态学报,2004,28(3):318-325.
作者姓名:杨晶  黄建辉  詹学明  李鑫  杜丽华  李凌浩
作者单位:中国科学院植物研究所植被数量生态学重点实验室,北京,100093
基金项目:中国科学院知识创新工程项目,国家重点基础研究发展计划(973计划)
摘    要: 采用动态密闭气室法(IRGA)对农牧交错区10种植物群落最大生物量时期的土壤呼吸日动态进行了测定,并将该方法得到的土壤日呼吸速率与碱液吸收法(AA)进行了比较。结果表明:1)10个群落土壤呼吸的昼夜变化比较明显,均为单峰型曲线,主要受土壤温度的驱动,但同时也受到当日降水情况和云量、风速等气象因子的较大影响。因此,这些群落土壤呼吸日动态的一致性较差,规律性并不明显。2)用碱液吸收法和动态密闭气室法测定的10个群落的土壤呼吸速率变化范围分别为394~894 mg C·m-2·d-1和313~2043 mg C·m-2·d-1,其中碱液吸收法测定结果平均为动态气室法的67.5%,明显低于动态密闭气室法。3)两种测定方法具有很好的相关性,R2为0.873 9。本研究中发现,在土壤呼吸速率低的情况下,两种方法的测定结果十分接近甚至碱液吸收法测定结果稍大于动态密闭气室法,而在土壤呼吸速率较高的情况下,动态密闭气室法测定结果则显著高于碱液吸收法。上述结果与国内外同类研究的结果高度一致,从而为校正以往采用碱液吸收法在该区域的测定结果提供了可靠依据。

关 键 词:土壤呼吸日动态  动态密闭气室法  碱液吸收法
修稿时间:2003年4月5日

THE DIURNAL DYNAMIC PATTERNS OF SOIL RESPIRATION FOR DIFFERENT PLANT COMMUNITIES IN THE AGRO_PASTORAL ECOTONE WITH REFERENCE TO DIFFERENT MEASURING METHODS
YANG Jing HUANG Jian-HuiZHAN Xue-Ming LI Xin DU Li-Hua and LI Ling-Hao.THE DIURNAL DYNAMIC PATTERNS OF SOIL RESPIRATION FOR DIFFERENT PLANT COMMUNITIES IN THE AGRO_PASTORAL ECOTONE WITH REFERENCE TO DIFFERENT MEASURING METHODS[J].Acta Phytoecologica Sinica,2004,28(3):318-325.
Authors:YANG Jing HUANG Jian-HuiZHAN Xue-Ming LI Xin DU Li-Hua and LI Ling-Hao
Abstract:Soil respiration is one of the key components in the carbon cycle of terrestrial ecosystems. Many studies on methodologies for measuring soil respiration have been conducted. However, soil respiration is difficult to measure accurately due to the uncertainty associated with the various methods, and the large spatial and temporal variability that is inherent in soil respiration due to many biotic and abiotic factors. In this study, we used the closed-chamber IRGA method to determine the diurnal (24 h) dynamic pattern of soil respiration at the maximum biomass period, and daily soil respiration rates calculated by this method were compared to those measured by the alkali absorption (AA) method for ten different plant communities in the agro-pastoral ecotone. For the IRGA method, we used the LI-6400 system (LI-COR, Lincoln, NE, USA) and for the AA method, we used NaOH solution for absorption of CO2. The major results were as follows: 1) The diurnal fluctuations in soil respiration rate for the ten communities were remarkable, all of them showed a single-peaked curve that was driven primarily by soil temperature. The combined influence of other meteorological factors such as temporary rainfall (thus soil moisture), wind speed and clouds were non-negligible. Therefore, the diurnal patterns for the ten communities differed; 2) The daily soil respiration rate for these communities varied from 394 to 894 mg C·m-2·d-1 as estimated by the alkali absorption method, and from 313 to 2 043 mg C·m-2·d-1 by the closed-chamber method, with the AA method averaging 67.5% of that measured by the closed chamber method; (is this what is meant? It wasn’t clear from the previous wording) 3) The results measured by the alkali absorption method compared well with those measured by the closed-chamber IRGA method, and the correlation between them was highly significant (R2=0.873 9). Of particular note was that when soil respiration rates were low, the measured values by the two methods were similar, whereas when soil respiration rates were high, the values measured by the closed-chamber method were significantly higher than that by the alkali absorption method. In general, the variation in measured values by the two methods was regular and systematic providing a reliable basis for correcting our past measurements by the alkali absorption method in the region.
Keywords:Diurnal pattern of soil respiration  Alkali absorption method  Closed-chamber IRGA method    Agro-pastoral ecotone
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