Effect of broken dead culms of Phragmites australis on radial oxygen loss in relation to radiation and temperature
Effect of broken dead culms of Phragmites australis on radial oxygen loss in relation to radiation and temperature
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DOI：
10.1007/s10750-006-0483-7
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发表时间：
2007-03
期刊：
影响因子：
2.6
通讯作者：
N. Tanaka;K. Yutani;Thida Aye;K. Jinadasa
中科院分区：
文献类型：
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作者：
N. Tanaka;K. Yutani;Thida Aye;K. Jinadasa
通过测定芦苇根系释放的氧气量，研究了气流、辐射和温度对芦苇根系径向耗氧量的影响。为了定量研究死秆对ROL的影响，将具有开放死秆的个体植物的ROL与具有封闭死秆的植物的ROL作为光强度和温度的函数进行比较。研究了ROL与植株形态（地上生物量、茎粗、茎高）的关系。当暴露于300、600和900 μmol m−2s− 1光照时，具有开放死秆的植物的ROL分别为15.6、22.5和30.9 μmol O2g− 1干根天−1，而具有封闭死秆的植物的ROL分别为11.0、16.4和23.3 μmol O2g− 1干根天−1。在各种条件下，死秆开放的植株的蒸腾速率均明显高于死秆封闭的植株。在20°C和30°C条件下，开放秆植株的ROL分别比封闭秆植株高37%和30%。叶片面积、地上部直径等植物特性参数对径向氧损失的影响是明显的。从植物生长季根际氧化的角度来看，人工湿地植物优化管理时应考虑枯秆的存在。这项研究提供了一个理论上的理解开放死秆，光照条件和温度对径向氧损失的影响。
The amount of oxygen released from the roots ofPhragmites australiswas quantified to examine the effects of airflow through dead culms, radiation, and temperature on radial oxygen loss (ROL). To investigate the effect of dead culms on ROL quantitatively, the ROL of individual plants with open dead culms was compared to that of plants with sealed dead culms as a function of light intensity and temperature. The relationship between ROL and plant morphology (aboveground biomass, shoot diameter, shoot height) was investigated. When exposed to 300, 600, and 900 μmol m−2s−1light, the ROL was 15.6, 22.5, and 30.9 μmol O2g−1dry root day−1, respectively, from plants with open dead culms and 11.0, 16.4, and 23.3 μmol O2g−1dry root day−1, respectively, from plants with sealed dead culms. The ROL from plants with open dead culms was obviously higher than that from plants with sealed dead culms in every condition. The ROL from plants with open culms was 37% and 30% higher than that from plants with sealed culms at 20°C and 30°C, respectively. The effects of plant-specific parameters such as leaf area and shoot diameter on radial oxygen loss were evident. From the point of view of rhizosphere oxidation during the growing season, the existence of open dead culms should be taken into consideration for optimal plant management in constructed wetlands. This study provides a theoretical understanding of the effects of open dead culms, light conditions, and temperature on radial oxygen loss.