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首页> 外文期刊>Plant and Soil >Responses of rice and winter wheat to free-air CO2 enrichment (China FACE) at rice/wheat rotation system.
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Responses of rice and winter wheat to free-air CO2 enrichment (China FACE) at rice/wheat rotation system.

机译：水稻/小麦轮作系统中水稻和冬小麦对空气中CO2浓度升高的响应（China FACE）。

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Free-air CO2 enrichment (FACE) system at a Chinese rice-wheat rotation field was constructed to investigate responses of rice and wheat crop growth to elevated CO2 and nitrogen fertilization. A factorial experiment design was set up with two levels of atmospheric CO2 concentration (350 and 550 micro mol mol-1) and N application rates (LN: 150 kg N ha-1 for rice and 125 kg N ha-1 for wheat; HN: 250 kg N ha-1 for rice and wheat, respectively). Across the entire crop growing seasons, plant fractions (i.e. leaf, stem, ear and root) were differentiated at representative growth stages and analysed using widely recognized parameters, relative growth rate (RGR) and allometric coefficient Ka (RGR ratio of above ground to below ground plant biomass). The C/N ratio and phosphorus concentration of plant were also determined. Rice and wheat RGRs responded to elevated CO2 in different ways, i.e. wheat RGR was always stimulated by elevated CO2 while rice RGR seemed to be depressed between rice tillering to jointing stages. Elevated CO2 affected the plant fractions differentially. For example, rice leaf might be the most strongly affected organ by RGR analysis and by Ka analysis it seems that elevated CO2 always led to higher below ground biomass (root) than above ground biomass. Besides, elevated CO2 usually resulted in a higher C/N ratio of plant due to its impact on N concentration instead of carbon. Regardless of CO2 treatment statistic analysis of rice and wheat RGR did not yield significant difference in plant growing patterns under LN and HN treatments, although LN always triggered a slightly higher C/N ratio of plant over the investigated period. Furthermore, it was generally observed that elevated CO2 could stimulate crop biomass to a greater extent under LN treatment than HN treatment. Phosphorus concentration of rice and wheat crop showed distinctive response to elevated CO2 and N constraint.
机译：建立了中国水稻-小麦轮作田的自由空气CO2富集（FACE）系统，以研究水稻和小麦作物生长对CO2和氮肥浓度升高的响应。设置了析因实验设计，将大气中的CO2浓度（350和550 micro mol mol-1）和氮的施用水平（LN：水稻为150 kg N ha-1，小麦为125 kg N ha-1）设置为两个水平; HN ：分别用于水稻和小麦的250 kg N ha-1）。在整个作物生长季节中，在代表性的生长阶段对植物部分（即叶，茎，穗和根）进行区分，并使用公认的参数，相对生长率（RGR）和异速系数Ka（地上与地下的RGR比）进行分析。地面植物生物量）。还确定了植物的碳氮比和磷浓度。水稻和小麦的RGR对CO2升高的反应方式不同，即，小麦RGR总是受到CO2升高的刺激，而水稻RGR似乎在分till至拔节期之间受到抑制。较高的二氧化碳对植物部分的影响不同。例如，通过RGR分析，稻叶可能是受影响最严重的器官，而通过Ka分析，似乎二氧化碳的升高总是导致地下生物量（根）比地下生物量高。此外，高浓度的二氧化碳通常会影响植物的碳氮比，因为它会影响氮的浓度而不是碳。尽管在调查期内LN总是触发略高的植物C / N比，但无论采用CO2处理方式，水稻和小麦的RGR均未在LN和HN处理下对植物生长方式产生显着差异。此外，通常观察到，与HN处理相比，在LN处理下，升高的CO2可以更大程度地刺激作物生物量。水稻和小麦作物中的磷浓度对升高的CO2和N限制表现出独特的响应。

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