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首页> 外文期刊>Plant and Soil >The effect of elevated atmospheric carbon dioxide concentration on the contribution of residual legume and fertilizer nitrogen to a subsequent wheat crop
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The effect of elevated atmospheric carbon dioxide concentration on the contribution of residual legume and fertilizer nitrogen to a subsequent wheat crop

机译：大气中二氧化碳浓度升高对剩余豆类和肥料氮对随后的小麦作物的贡献的影响

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摘要

This study investigated the residual contribution of legume and fertilizer nitrogen (N) to a subsequent crop under the effect of elevated carbon dioxide concentration ([CO2]). Field pea (Pisum sativum L.) was labeled in situ with N-15 (by absorption of a N-15-labeled urea solution through cut tendrils) under ambient and elevated (700 mu mol mol(-1)) [CO2] in controlled environment glasshouse chambers. Barley (Hordeum vulgare L.) and its soil were also labeled under the same conditions by addition of N-15-enriched urea to the soil. Wheat (Triticum aestivum L.) was subsequently grown to physiological maturity on the soil containing either N-15-labeled field pea residues (including N-15-labeled rhizodeposits) or N-15-labeled barley plus fertilizer N-15 residues. Elevated [CO2] increased the total biomass of field pea (21 %) and N-fertilized barley (23 %), but did not significantly affect the biomass of unfertilized barley. Elevated [CO2] increased the C:N ratio of residues of field pea (18 %) and N-fertilized barley (19 %), but had no significant effect on that of unfertilized barley. Elevated [CO2] increased total biomass (11 %) and grain yield (40 %) of subsequent wheat crop regardless of rotation type in the first phase. Irrespective of [CO2], the grain yield and total N uptake by wheat following field pea were 24 % and 11 %, respectively, higher than those of the wheat following N-fertilized barley. The residual N contribution from field pea to wheat was 20 % under ambient [CO2], but dropped to 11 % under elevated [CO2], while that from fertilizer did not differ significantly between ambient [CO2] (4 %) and elevated [CO2] (5 %). The relative value of legume derived N to subsequent cereals may be reduced under elevated [CO2]. However, compared to N fertilizer application, legume incorporation will be more beneficial to grain yield and N supply to subsequent cereals under future (elevated [CO2]) climates.
机译：这项研究调查了在较高的二氧化碳浓度（[CO2]）的影响下，豆类和化肥氮（N）对后续作物的残留贡献。豌豆（Pisum sativum L.）在环境和环境中升高（700μmol mol（-1））[CO2]的条件下，用N-15原位标记（通过切下的卷须吸收N-15标记的尿素溶液）。可控环境温室。通过在土壤中添加富含N-15的尿素，在相同条件下对大麦（Hordeum vulgare L.）及其土壤进行标记。随后将小麦（Triticum aestivum L.）在含有N-15标记的豌豆残渣（包括N-15标记的根茎沉积物）或N-15标记的大麦加肥料N-15残留物的土壤上生长至生理成熟。升高的[CO2]增加了豌豆和氮肥大麦的总生物量（21％），但未显着影响未受精大麦的生物量。升高的[CO2]增加了豌豆（18％）和氮肥大麦（19％）的残留碳氮比，但对未肥大麦的氮磷比没有显着影响。升高的[CO2]可以增加随后的小麦作物的总生物量（11％）和谷物产量（40％），而与第一阶段的轮作类型无关。与[CO2]无关，豌豆后小麦的籽粒产量和总氮吸收量分别比施氮大麦的小麦高24％和11％。在环境[CO2]下，豌豆对小麦的残留氮贡献为20％，但在[CO2]升高下，下降至11％，而肥料的氮贡献在环境[CO2]（4％）和[CO2]之间无显着差异。 ]（5％）。在升高的[CO2]下，豆类来源的氮与后续谷物的相对价值可能降低。但是，与施用氮肥相比，豆类作物的掺入将对未来（升高的[CO2]）气候下的谷物产量和后续谷物的氮素供应更为有利。

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