CO2 effects on plant nutrient concentration depend on plant functional group and available nitrogen: a meta-analysis (Retracted article. See vol. 216, pg. 1675, 2015)
CO2 effects on plant nutrient concentration depend on plant functional group and available nitrogen: a meta-analysis (Retracted article. See vol. 216, pg. 1675, 2015)
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DOI：
10.1007/s11258-011-9998-8
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发表时间：
2012-03-01
期刊：
影响因子：
1.7
通讯作者：
Hungate, Bruce A.
中科院分区：
文献类型：
--
作者：
Duval, Benjamin D.;Blankinship, Joseph C.;Hungate, Bruce A.
二氧化碳浓度升高预计会通过碳水化合物稀释和提高养分利用效率来降低植物养分浓度。二氧化碳浓度升高会持续降低植物叶片氮含量，但对二氧化碳在植物营养物质范围内的影响尚无共识。我们使用荟萃分析量化了4个植物官能团和2个施氮水平下CO2对叶片、茎、根和种子中B、Ca、Cu、Fe、K、Mg、Mn、P、S和Zn浓度的影响。CO2对植物养分浓度的影响取决于养分、植物类群、组织和氮素状况。CO2降低了B、Cu、Fe和Mg的浓度，但增加了N-2固定菌叶片中Mn的浓度。CO2浓度升高，草叶片中Cu、Fe和Zn浓度升高，Mn浓度降低。在高N条件下，CO2显著降低Cu、Fe、Mg和S，而在低N条件下，只有Fe显著降低；在高N条件下，CO2的升高降低了作物叶片中的Mg和Zn，而在低N条件下，Mn的升高不影响作物根系中的养分浓度，但CO2降低了树木根系中的Ca、K、Mg和P。CO2浓度升高，作物种子S含量降低。我们还测试了“稀释模型”的有效性。CO2使植物营养物质的浓度在营养物质和植物类群中降低了6.6%，但碳水化合物积累的降低幅度小于预期（18.4%）。研究发现，CO2升高对植物营养状况的影响在营养元素、植物功能基团和植物组织之间存在差异。我们的综合研究表明，植物类群和植物器官、氮状态以及土壤养分化学的差异，排除了与碳水化合物稀释严格相关的普遍假设，这些假设与植物对二氧化碳升高的养分反应有关。
Elevated CO2 is expected to lower plant nutrient concentrations via carbohydrate dilution and increased nutrient use efficiency. Elevated CO2 consistently lowers plant foliar nitrogen, but there is no consensus on CO2 effects across the range of plant nutrients. We used meta-analysis to quantify elevated CO2 effects on leaf, stem, root, and seed concentrations of B, Ca, Cu, Fe, K, Mg, Mn, P, S, and Zn among four plant functional groups and two levels of N fertilization. CO2 effects on plant nutrient concentration depended on the nutrient, plant group, tissue, and N status. CO2 reduced B, Cu, Fe, and Mg, but increased Mn concentration in the leaves of N-2 fixers. Elevated CO2 increased Cu, Fe, and Zn, but lowered Mn concentration in grass leaves. Tree leaf responses were strongly related to N status: CO2 significantly decreased Cu, Fe, Mg, and S at high N, but only Fe at low N. Elevated CO2 decreased Mg and Zn in crop leaves grown with high N, and Mn at low N. Nutrient concentrations in crop roots were not affected by CO2 enrichment, but CO2 decreased Ca, K, Mg and P in tree roots. Crop seeds had lower S under elevated CO2. We also tested the validity of a "dilution model." CO2 reduced the concentration of plant nutrients 6.6% across nutrients and plant groups, but the reduction is less than expected (18.4%) from carbohydrate accumulation alone. We found that elevated CO2 impacts plant nutrient status differently among the nutrient elements, plant functional groups, and among plant tissues. Our synthesis suggests that differences between plant groups and plant organs, N status, and differences in nutrient chemistry in soils preclude a universal hypothesis strictly related to carbohydrate dilution regarding plant nutrient response to elevated CO2.