Respiration of three Belgian crops: Partitioning of total ecosystem respiration in its heterotrophic, above- and below-ground autotrophic components
Respiration of three Belgian crops: Partitioning of total ecosystem respiration in its heterotrophic, above- and below-ground autotrophic components
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DOI：
10.1016/j.agrformet.2011.01.012
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发表时间：
2011-05
影响因子：
6.2
通讯作者：
M. Suleau;C. Moureaux;Delphine Dufranne;P. Buysse;B. Bodson;J. Destain;B. Heinesch;A. Debacq
中科院分区：
文献类型：
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作者：
M. Suleau;C. Moureaux;Delphine Dufranne;P. Buysse;B. Bodson;J. Destain;B. Heinesch;A. Debacq
连续三年，在Lonzée试验场以传统方式管理的一种生产作物上安装了一个实验系统，该系统结合了涡旋协方差系统、微气象站和放置在种植区和根隔离区的土室。先后对种薯、冬小麦和甜菜进行了测定。本研究的总体目标是，首先评估连续几年在同一地点种植的三种农作物(种薯、冬小麦和甜菜)的异养、地上自养和地下自养呼吸对总生态系统呼吸(TER)的相对贡献，其次确定这些贡献的驱动变量。结果表明，在观测期间，TER以自养呼吸(AR)为主(60-90%)，AR以地上部分(60-80%)为主。HR随温度升高而增加，与总初级生产量(GPP)无关，而AR受GPP驱动，大部分与温度无关。对GPP的AR反应是作物特有的：不仅AR强度不同，而且AR在地上(Ara)和地下(ARb)成分之间的分布也因作物不同而不同，在冬小麦中，从一个发育阶段到另一个发育阶段也是如此。一般情况下，向根部分配碳越重要，ARB对AR的贡献越大。不确定度分析表明，不确定度的主要来源是土室测量的空间变异性，以及与涡旋协方差测量的数据缺口填充方法相关的不确定度。
An experimental system combining an eddy covariance system, a micrometeorological station and soil chambers placed in planted areas and in root exclusion zones was installed during three successive years in a production crop managed in a traditional way at the Lonzée experimental site (Belgium). Measurements were made successively on seed potato, winter wheat and sugar beet. The general objectives of the study were, first to evaluate the relative contributions to total ecosystem respiration (TER) of heterotrophic, above ground autotrophic and below ground autotrophic respiration over a succession of three agricultural crops (seed potato, winter wheat and sugar beet) cultivated on successive years at the same location and, secondly, to identify the driving variables of these contributions. Results showed that, during the observation periods, TER was dominated by autotrophic respiration (AR) (60–90%) and that AR was dominated by its above ground component (60–80%). HR was found to increase with temperature and to be independent of Gross Primary Production (GPP), whereas AR was driven by GPP and was mostly independent of temperature. The AR response to GPP was specific to the crop: not only AR intensity but also AR distribution between its above- (ARa) and below- (ARb) ground components were found to differ from one crop to another and, in the winter wheat, from one development stage to another. Generally, ARb contribution to AR was found larger when carbon allocation towards roots was more important. An uncertainty analysis was made and showed that the main sources of uncertainties on the estimates were the spatial variability for soil chamber measurements and uncertainties linked to the data gap filling method for eddy covariance measurements.