Does photosynthesis affect grassland soil-respired CO2 and its carbon isotope composition on a diurnal timescale?

被引:228
作者
Bahn, Michael [1 ]
Schmitt, Michael [1 ]
Siegwolf, Rolf [2 ]
Richter, Andreas [3 ]
Brueggemann, Nicolas [4 ]
机构
[1] Univ Innsbruck, Inst Ecol, A-6020 Innsbruck, Austria
[2] Paul Scherrer Inst, CH-5232 Villigen, Switzerland
[3] Univ Vienna, Fac Life Sci, Dept Chem Ecol & Ecosyst Res, A-1090 Vienna, Austria
[4] Forschungszentrum Karlsruhe, Inst Meteorol & Climate Res, Atmospher Environm Res Div IMK IFU, D-82467 Garmisch Partenkirchen, Germany
基金
奥地利科学基金会;
关键词
assimilate supply; delta C-13; mountain grassland; pulse labelling; plant-soil carbon (C) transfer; soil respiration; tunable diode laser; SHORT-TERM VARIATIONS; TEMPERATURE SENSITIVITY; TERRESTRIAL ECOSYSTEMS; TREE PHOTOSYNTHESIS; RESPIRATION; C-13; DISCRIMINATION; VARIABILITY; MYCORRHIZAL; DELTA-C-13;
D O I
10.1111/j.1469-8137.2008.02755.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Soil respiration is the largest flux of carbon (C) from terrestrial ecosystems to the atmosphere. Here, we tested the hypothesis that photosynthesis affects the diurnal pattern of grassland soil-respired CO2 and its C isotope composition (delta C-13(SR)). A combined shading and pulse-labelling experiment was carried out in a mountain grassland. delta C-13(SR) was monitored at a high time resolution with a tunable diode laser absorption spectrometer. In unlabelled plots a diurnal pattern of delta C-13(SR) was observed, which was not explained by soil temperature, moisture or flux rates and contained a component that was also independent of assimilate supply. In labelled plots delta C-13(SR) reflected a rapid transfer and respiratory use of freshly plant- assimilated C and a diurnal shift in the predominant respiratory C source from recent (i. e. at least 1 d old) to fresh (i. e. photoassimilates produced on the same day). We conclude that in grasslands the plant- derived substrates used for soil respiratory processes vary during the day, and that photosynthesis provides an important and immediate C source. These findings indicate a tight coupling in the plant- soil system and the importance of plant metabolism for soil CO2 fluxes.
引用
收藏
页码:451 / 460
页数:10
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