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Mineral Elements of Subtropical Tree Seedlings in Response to Elevated Carbon Dioxide and Nitrogen Addition

机译:亚热带树木幼苗对二氧化碳和氮增加的响应中的矿质元素

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摘要

Mineral elements in plants have been strongly affected by increased atmospheric carbon dioxide (CO2) concentrations and nitrogen (N) deposition due to human activities. However, such understanding is largely limited to N and phosphorus in grassland. Using open-top chambers, we examined the concentrations of potassium (K), calcium (Ca), magnesium (Mg), aluminum (Al), copper (Cu) and manganese (Mn) in the leaves and roots of the seedlings of five subtropical tree species in response to elevated CO2 (ca. 700 μmol CO2 mol-1) and N addition (100 kg N ha-1 yr-1) from 2005 to 2009. These mineral elements in the roots responded more strongly to elevated CO2 and N addition than those in the leaves. Elevated CO2 did not consistently decrease the concentrations of plant mineral elements, with increases in K, Al, Cu and Mn in some tree species. N addition decreased K and had no influence on Cu in the five tree species. Given the shifts in plant mineral elements, Schima superba and Castanopsis hystrix were less responsive to elevated CO2 and N addition alone, respectively. Our results indicate that plant stoichiometry would be altered by increasing CO2 and N deposition, and K would likely become a limiting nutrient under increasing N deposition in subtropics.
机译:由于人类活动,大气中二氧化碳(CO2)浓度增加和氮(N)沉积增加,严重影响了植物中的矿物质元素。但是,这种认识在很大程度上仅限于草地上的氮和磷。我们使用开放式腔室检查了五个幼苗的叶片和根中钾(K),钙(Ca),镁(Mg),铝(Al),铜(Cu)和锰(Mn)的浓度亚热带树种对二氧化碳浓度升高(约700μmolCO2 mol -1 )和氮的添加(100 kg N ha -1 yr -1 )的响应sup>)从2005年到2009年。与叶片中的元素相比,根部中的这些矿物元素对升高的CO2和N的响应更为强烈。二氧化碳浓度升高并不能持续降低植物矿物质元素的浓度,某些树种中钾,铝,铜和锰的含量也会增加。氮的添加减少了钾,对五种树种的铜没有影响。考虑到植物矿质元素的变化,单独的Schima superba和Castanopsis hystrix对升高的CO2和N的响应较小。我们的结果表明,在亚热带,随着CO2和N沉积的增加,植物化学计量会发生变化,而K在增加的N沉积下可能会成为限制养分。

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