The use of C14O2 canopy techniques for measuring carbon transfer through the plant-soil system
The use of C14O2 canopy techniques for measuring carbon transfer through the plant-soil system
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DOI：
10.1007/bf00779017
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发表时间：
1973-04
期刊：
影响因子：
4.9
通讯作者：
F. Warembourg;E. Paul
中科院分区：
文献类型：
--
作者：
F. Warembourg;E. Paul
通过将生长中的植物暴露于乙酸丁酸纤维素树冠下的C14 O2来标记生长中的植物的方法已经被开发用于实验室和现场使用。标记的长度范围从2到33天，并且自动控制气氛中的C14 O2含量。这使得测量植物的碳同化、地下光合产物的转移和根系的呼吸成为可能。在实验室中，通过使用RTV橡胶隔板分离地上和地下植物部分来测量小麦植物的根系呼吸。一半至三分之二的同化碳被发现在地上，15%至25%的根和芽基地以下的分区和17%至25%的地下呼吸损失。这些比例的变化与植物的成熟阶段有关，在天然草地上，地上和地下的相对生产力为50%，光合产物到达不同深度的根所需的时间为1 - 5天，沉积在根中的物质的量随时间和土壤含水量而变化。使用插入在不同深度的树冠下允许土壤空气采样C14和CO2测量管。土壤C14 O2通量表明，在8天的根系呼吸占24%的标记后，两天的标记期转移到根的标记碳。
Methods for labelling growing plants by exposing them to C14O2under a cellulose acetate-butyrate canopy have been developed for laboratory and field use. The length of labelling ranged from 2 to 33 days and the C14O2content of the atmosphere was automatically controlled. This made it possible to measure carbon assimilation by the plants, transfer of photosynthates beneath ground and respiration of the roots.In the laboratory, root respiration of wheat plants was measured by separating the above and beneath ground plant parts using a RTV rubber partition. Half to two thirds of the assimilated carbon was found above ground, 15 to 25 per cent in the roots and shoot bases below the partition and 17 to 25 per cent was lost by underground respiration. The variability of these proportions was related to the stage of maturity of the plants.On native grassland, the relative above and beneath ground productivity was 50 per cent. The time required for the photosynthates to reach the roots at various depths ranged from 1 to 5 days and the amount of material deposited in the roots changed with time and soil moisture content. The use of tubes inserted at various depths beneath the canopy permitted sampling of soil air for C14and CO2measurements. The soil C14O2flux indicated that root respiration during 8 days accounted for 24 per cent of the labelled carbon translocated to the roots after a two days labelling period.