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首页> 外文期刊>Plant and Soil >Investigation of photosynthate-C allocation 27 days after C-13-pulse labeling of Zea mays L. at different growth stages
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Investigation of photosynthate-C allocation 27 days after C-13-pulse labeling of Zea mays L. at different growth stages

机译：C-13脉冲标记玉米不同生长阶段后27天的光合产物-C分配调查

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Pulse labeling of crops using C-13 is often employed to trace photosynthesized carbon (C) within crop-soil systems. However, few studies have compared the C distribution for different labeling periods. The overall aim of this study was to determine the length of the monitoring interval required after C-13-pulse labeling to quantify photosynthate C allocation into plant, soil and rhizosphere respiration pools for the entire growing season of maize (Zea mays L.). Pot grown maize was pulse-labeled with (CO2)-C-13 (98 at. %) at the beginning of emergence, elongation, heading and grainfilling growth stages. The routing of C-13 into shoot and root biomass, soil CO2 flux and soil organic carbon (SOC) pools was monitored for 27 days after C-13-pulse labeling at the beginning of each growth stage. The majority of the C-13 was recovered after 27 d in the maize shoots, i.e., 57 %, 53 %, 70 % and 80 %, at the emergence, elongation, heading, and grainfilling stages, respectively. More C-13 was recovered in the root biomass at elongation (27 %) compared to the least at the grainfilling stage (3 %). The amount recovered in the soil was the smallest pool of C-13 at emergence (2.3 %), elongation (3.8 %), heading and grainfilling (less than 2 %). The amount of C-13 recovered in rhizosphere respiration, i.e. (CO2)-C-13, was greatest at emergence (26 %), and similar at the elongation, heading and grainfilling stages (similar to 16 %). At least 24 days is required to effectively monitor the recovery of C-13 after pulse labeling with (CO2)-C-13 for maize in plant and soil pools. The recovery of C-13 differed between growth stages and corresponded to the changing metabolic requirements of the plant, which indicated labeling for the entire growth season would more accurately quantify the C budget in plant-soil system.
机译：使用C-13对农作物进行脉冲标记通常用于跟踪农作物土壤系统中的光合作用碳（C）。但是，很少有研究比较不同标记时期的C分布。这项研究的总体目标是确定C-13脉冲标记后需要的监测间隔的长度，以量化整个玉米整个生长季节（Zea mays L.）光合作用C在植物，土壤和根际呼吸池中的分配。在出苗，伸长，抽穗和灌浆生长阶段开始时，将盆栽玉米用（CO2）-C-13（98 at。％）进行脉冲标记。在每个生长阶段开始时，在进行C-13脉冲标记后27天内，监测C-13进入芽和根生物量，土壤CO2通量和土壤有机碳（SOC）库的路线。玉米芽27 d后，在出芽，伸长，抽穗和灌浆阶段分别回收了大部分的C-13，分别为57％，53％，70％和80％。与在灌浆阶段最少的（3％）相比，在伸长量（27％）的根生物量中回收了更多的C-13。土壤中的回收量是出土时C-13的最小库（2.3％），伸长率（3.8％），抽穗和灌浆（小于2％）。在根际呼吸中回收的C-13量，即（CO2）-C-13，在出苗时最大（26％），在伸长，抽穗和灌浆期相似（大约16％）。用植物（CO2）-C-13脉冲标记植物和土壤库中的玉米后，至少需要24天才能有效地监测C-13的回收。 C-13的回收在不同的生长期之间是不同的，并且与植物新陈代谢需求的变化相对应，这表明标记整个生长季节将更准确地量化植物-土壤系统中的C预算。

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