Short-term carbon dynamics in a temperate grassland and heathland ecosystem exposed to 104 days of drought followed by irrigation
Short-term carbon dynamics in a temperate grassland and heathland ecosystem exposed to 104 days of drought followed by irrigation
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DOI：
10.1080/10256016.2017.1371714
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发表时间：
2018-01
影响因子：
1.3
通讯作者：
K. Srivastava;A. Jentsch;J. Kreyling;B. Glaser;G. Wiesenberg
中科院分区：
文献类型：
--
作者：
K. Srivastava;A. Jentsch;J. Kreyling;B. Glaser;G. Wiesenberg
摘要温带生态系统易受干旱事件的影响。采用13CO2脉冲追踪标记试验，研究了干旱（104 d）后灌溉对植物碳吸收、同化和土壤碳输入的影响。第一个13 CO2脉冲在第0天的实验揭示了更高的13 C示踪剂吸收的芽，根和土壤相比，第二个脉冲（第44天），其中所有的植物表现出显着较低的13 C示踪剂吸收。在第三个13 CO2脉冲（第70天），非常低的13 C吸收在芽导致一个可以忽略不计的分配到根和土壤中的13 C。在严重干旱后的灌溉期间，在第二和第三脉冲标记期间分配在植物组织中的13C示踪剂在灌溉开始后立即重新分配在根和土壤中。这种重新分配是更高和更持久的石楠草原生态系统相比。
ABSTRACT Temperate ecosystems are susceptible to drought events. The effect of a severe drought (104 days) followed by irrigation on the plant C uptake, its assimilation and input of C in soil were examined using a triple 13CO2 pulse-chase labelling experiment in model grassland and heathland ecosystems. First 13CO2 pulse at day 0 of the experiment revealed much higher 13C tracer uptake for shoots, roots and soil compared to the second pulse (day 44), where all plants showed significantly lower 13C tracer uptake. After the third 13CO2 pulse (day 70), very low 13C uptake in shoots led to a negligible allocation of 13C into roots and soil. During irrigation after the severe drought, the 13C tracer that was allocated in plant tissues during the second and third pulse labelling was re-allocated in roots and soil, as soon as the irrigation started. This re-allocation was higher and longer lasting in heathland compared to grassland ecosystems.