Nutrient supply to soil offsets the ozone-induced growth reduction in Fagus crenata seedlings
Nutrient supply to soil offsets the ozone-induced growth reduction in Fagus crenata seedlings
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DOI：
10.1007/s00468-016-1481-7
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发表时间：
2017-02
期刊：
影响因子：
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通讯作者：
Yoshiyuki Kinose;Yoshinobu Fukamachi;Shigeaki Okabe;Hiroka Hiroshima;Makoto Watanabe;T. Izuta
中科院分区：
文献类型：
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作者：
Yoshiyuki Kinose;Yoshinobu Fukamachi;Shigeaki Okabe;Hiroka Hiroshima;Makoto Watanabe;T. Izuta
关键信息臭氧引起的高肥毛豆幼苗全株干质量的减少被叶面积的增加所抵消，尽管臭氧暴露降低了净光合速率。在由三个水平的气体处理组合组成的九个处理下，使幼苗生长两个生长季节（活性炭过滤空气或1.0或1.5倍环境浓度的O3），有三个水平的土壤养分处理（不施肥或供应相对低或高浓度的复合肥料）。在第二生长季，O3和土壤养分供应对净光合速率、初叶面积和全株干质量有显著的交互作用。在非和低施肥幼苗中观察到O3诱导的干物质减少，但在高施肥幼苗中没有观察到。然而，O3诱导的净光合速率降低的程度是在低和高施肥幼苗比在非施肥幼苗。虽然在非和低施肥幼苗中检测到O3诱导的叶面积减少，但高施肥幼苗的叶面积倾向于通过暴露于O3而增加。因此，O3诱导的高施肥幼苗的全株干质量的减少被认为是抵消了O3诱导的增加，在第二个生长季节期间的第一次冲洗叶面积。为了准确评价O3对毛茛干物质生产的影响，必须考虑土壤养分条件对毛茛O3敏感性的影响。
Key messageOzone-induced reduction in the whole-plant dry mass of high-fertilisedFagus crenataseedlings was offset by the increase in leaf area, although the exposure to ozone decreased net photosynthetic rate.AbstractTo clarify the effects of ozone (O3) on the growth ofFagus crenataseedlings under different soil nutrient conditions, seedlings were grown for two growing seasons under nine treatments comprised of a combination of three levels of gas treatments (charcoal-filtered air or O3at 1.0 or 1.5 times ambient concentration), with three levels of soil nutrient treatments (non-fertilised or a supply of relatively low or high concentrations of compound fertiliser). Significant interactive effects of O3and nutrient supply to soil on net photosynthetic rate, area of first-flush leaves, and the whole-plant dry mass were detected during the second growing season. The O3-induced reduction in dry mass was observed in the non- and low-fertilised seedlings, but not in the high-fertilised seedlings. However, the extent of O3-induced reduction in net photosynthetic rate was higher in the low- and high-fertilised seedlings than in the non-fertilised seedlings. Although the O3-induced reduction in the leaf area was detected in the non- and low-fertilised seedlings, leaf area of the high-fertilised seedlings tended to be increased by the exposure to O3. Therefore, O3-induced reduction in the whole-plant dry mass of the high-fertilised seedlings is considered to be offset by the O3-induced increase in the area of first-flush leaves during the second growing season. To accurately assess the effects of O3on dry matter production ofF.crenata, the modification of the sensitivity to O3due to soil nutrient conditions must be taken into consideration.