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首页> 外文期刊>Plant and Soil >Rhizosphere respiration varies with plant species and phenology: A greenhouse pot experiment
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Rhizosphere respiration varies with plant species and phenology: A greenhouse pot experiment

机译：根际呼吸随植物种类和物候的变化而变化：温室盆栽实验

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Two plant–soil systems, C3 plant - `C4 soil' (obtained from a grassland dominated by C4 grasses) and C4 plant - `C3 soil' (obtained from a pasture dominated by C3 grasses), were used in this study to monitor the dynamics of rhizosphere respiration (root-derived CO2-C) at different plant developmental stages. In C3 plant - `C4 soil' system, CO2-C derived from soybean roots increased significantly from vegetative stage (55.69 mg C d−1 pot−1) to flowering stage (132.18 mg C d−1 pot−1), and it declined thereafter (83.37-111.63 mg C d−1 pot−1). However, no significant change of CO2-C derived from sunflower roots was observed at different plant developmental stages (67.05–77.66 mg C d−1 pot−1). CO2-C derived from soybean (Glycine max (L) Merr) roots was significantly higher than that derived from sunflower (Helianthus annuus) roots except for that at vegetative stage. In C4 plant - `C3 soil' system, CO2-C derived from sorghum roots was significantly higher at flowering stage (169.51 mg C d−1 pot−1) than at other stages (75.89–113.26 mg C d−1 pot−1). CO2-C derived from amaranthus roots was the highest at vegetative stage (88.88 mg C d−1 pot−1) and it declined significantly thereafter (23.42–53.47 mg C d−1 pot−1). CO2-C derived from sorghum (Sorghum bicolor) roots was significantly higher than that from amaranthus (Amaranthus hypochondriacus) roots except for that at vegetative stage. In conclusion, rhizosphere respiration varied not only with plant species but also with plant phenology. With the soil volume used in our pots, the overall percentages of cumulative root-derived CO2-C to total soil respiration were 61.22, 61.14, 81.84 and 67.37% for soybean, sunflower, sorghum and amaranthus, respectively. Specific rhizosphere respiration was also discussed and was used as an index of root activity and vitality.
机译：两种植物-土壤系统，C3 植物-“ C4 土壤”（从以C4 草为主的草原获得）和C4 植物-“ C3 土壤'（从以C3 草为主的牧场获得）被用于监测植物不同发育阶段根际呼吸（根源的CO2-C）的动态。在C3 植物-'C4 土壤'系统中，大豆根源的CO2 -C从营养期开始显着增加（55.69 mg C d-1 pot-1 ）到开花期（132.18 mg C d-1 pot-1 ），然后下降（83.37-111.63 mg C d-1 pot-1 ）。然而，在不同的植物发育阶段（67.05-77.66 mg C d-1 pot-1 ），未观察到向日葵根的CO2 -C的显着变化。大豆（Glycine max（L）Merr）根部的CO2 C明显高于植物（向日葵）根部的CO2 -C。在C4 植物-'C3 土壤'系统中，高粱根部的CO2 -C在开花期显着升高（169.51 mg C d-1 pot-1 < / sup>），而不是其他阶段（75.89–113.26 mg C d-1 pot-1 ）。营养期stage菜根的CO2 -C最高（88.88 mg C d-1 pot-1 ），此后显着下降（23.42–53.47 mg C d-1） pot-1 ）。除了营养期外，高粱（双色高粱）根的CO2 -C显着高于a（Amaranthus hypochondriacus）根。总之，根际呼吸不仅随植物种类而变化，而且随植物物候变化。在我们的盆中使用土壤量的情况下，大豆，向日葵，高粱和a属植物的根系累积CO2 -C占总土壤呼吸的总百分比分别为61.22、61.14、81.84和67.37％。还讨论了特定的根际呼吸作用，并将其用作根系活动和活力的指标。

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