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首页> 美国卫生研究院文献>Scientific Reports >Changes in plant C N and P ratios under elevated CO2 and canopy warming in a rice-winter wheat rotation system
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Changes in plant C N and P ratios under elevated CO2 and canopy warming in a rice-winter wheat rotation system

机译：稻－冬小麦轮作体系中CO2升高和冠层升温条件下植物CN和P比的变化

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Elevated atmospheric CO2 concentration ([CO2]) can stimulate plant growth through enhanced photosynthetic rate. However, plant C, N and P ratios in response to elevated [CO2] combined with canopy warming in rice-winter wheat rotation system remain largely unknown. Here we investigated the impacts of elevated [CO2] and warming on plant nutrient ratios under open-air conditions. Four treatments including the ambient condition (CK), elevated [CO2] (500 ppm, CE), canopy warming (+2 °C, WA), and the combination of elevated [CO2] and warming (CW) were used to investigate the responses of plant C, N and P ratios in a rice-winter wheat rotation system in southeast China. Results showed that elevated [CO2] increased C:N ratio in whole plant by 8.4–14.3% for both crops, and increased C:P ratio by 11.3% for rice. The changes in ratio were due to an increase in C concentration by 0.8–1.2% and a reduction in N concentration by 7.4–10.7% for both crops, and a reduction in P concentration by 10.0% for rice. Warming increased N allocation in rice leaf and N concentration by 12.4% for rice, resulting in increases in the ratios of N to C and P by 11.9% and 9.7% in rice, but not in wheat. However, CW had no effect on plant C:N ratio in rice, indicating the positive effect of elevated [CO2] could offset the negative impact of warming on C:N ratio. By contrast, CW significantly decreased plant C:P and N:P ratios by 16% due to the increase in P allocation in stem for wheat. These results suggest that impacts of climate change on plant nutrient balance occur through interactions between the effects of climate change on nutrient uptake and allocation, which is important for food quality and productivity under global climate change.
机译：升高的大气CO2浓度（[CO2]）可通过提高光合作用速率来刺激植物生长。然而，在稻-冬小麦轮作系统中，植物[C]，[N]和[P]比对[CO2]升高和冠层变暖的响应仍然未知。在这里，我们研究了露天环境下升高的[CO2]和变暖对植物养分比的影响。四种处理方法包括环境条件（CK），升高的[CO2]（500 ppm，CE），树冠变暖（+ 2°C，WA）以及升高的[CO2]和变暖（CW）的组合。冬小麦轮作体系中植物碳，氮和磷比的响应结果表明，升高的[CO2]可使两种作物的全株碳氮比提高8.4-14.3％，水稻使碳磷比提高11.3％。比率的变化是由于两种作物的碳含量增加了0.8–1.2％，氮含量减少了7.4–10.7％，以及水稻的磷含量减少了10.0％。气候变暖使水稻叶片中的氮分配增加，水稻中的氮含量增加了12.4％，导致水稻中氮，碳和磷的比率分别增加了11.9％和9.7％，但没有增加小麦。然而，连续水对水稻中植物碳氮比没有影响，表明升高的[CO2]的正效应可以抵消变暖对水稻碳氮比的负面影响。相比之下，由于小麦茎中磷的分配增加，CW显着降低了植物C：P和N：P的比例，降低了16％。这些结果表明，气候变化对植物养分平衡的影响是通过气候变化对养分吸收和分配的影响之间的相互作用而发生的，这对于全球气候变化下的食品质量和生产率至关重要。

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