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首页> 外文期刊>Plant and Soil >Rhizosphere priming effects on the decomposition of soil organic matter in C4 and C3 grassland soils
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Rhizosphere priming effects on the decomposition of soil organic matter in C4 and C3 grassland soils

机译：根际引发对C4 和C3 草地土壤有机质分解的影响

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摘要

Using a natural abundance 13C method, soil organic matter (SOM) decomposition was studied in a C3 plant – `C4 soil' (C3 plant grown in a soil obtained from a grassland dominated by C4 grasses) system and a C4 plant – `C3 soil' (C4 plant grown in a soil taken from a pasture dominated by C3 grasses) system. In C3 plant – `C4 soil' system, cumulative soil-derived CO2–C were higher in the soils planted with soybean (5499 mg pot−1) and sunflower (4484 mg pot−1) than that in `C4 soil' control (3237 mg pot−1) without plants. In other words, the decomposition of SOM in soils planted with soybean and sunflower were 69.9% and 38.5% faster than `C4 soil' control. In C4 plant – `C3 soil' system, there was an overall negative priming effect of live roots on the decomposition of SOM. The cumulative soil-derived CO2–C were lower in the soils planted with sorghum (2308 mg pot−1) and amaranthus (2413 mg pot−1) than that in `C3 soil' control (2541 mg pot−1). The decomposition of SOM in soils planted with sorghum and amaranthus were 9.2% and 5.1% slower than `C3 soil' control. Our results also showed that rhizosphere priming effects on SOM decomposition were positive at all developmental stages in C3 plant – `C4 soil' system, but the direction of the rhizosphere priming effect changed at different developmental stages in the C4 plant – `C3 soil' system. Implications of rhizosphere priming effects on SOM decomposition were discussed.
机译：使用自然丰度13 C方法，研究了C3 植物-“ C4 土壤”（C3 土壤中生长的C3 植物）中的土壤有机质（SOM）分解来自以C4 草为主的草地）系统和C4 植物-“ C3 土壤”（C4 植物）生长在从以C3为主导的牧场中的土壤中 grass）系统。在C3 植物-“ C4 土壤”系统中，大豆（5499 mg pot-1 ）和向日葵种植的土壤中累积的土壤源CO2 -C较高。 （4484 mg pot−1 ）比“ C4 土壤”对照（3237 mg pot-1 ）没有植物。换句话说，大豆和向日葵种植的土壤中SOM的分解速度比“ C4 土壤”控制快69.9％和38.5％。在C4 植物-“ C3 土壤”系统中，活根对SOM的分解具有整体负面的启动作用。高粱（2308 mg pot-1 ）和a菜（2413 mg pot-1 ）种植的土壤中累积的源自土壤的CO2 C低于`C3 < / sub>土壤控制（2541 mg pot-1 ）。高粱和a菜种植的土壤中SOM的分解比“ C3 土壤”对照慢9.2％和5.1％。我们的研究结果还表明，在C3 植物-“ C4 土壤”系统的所有发育阶段，根际启动作用对SOM分解的影响都是正的，但在不同的发育阶段，根际启动作用的方向发生了变化。 C4 植物-“ C3 土壤”系统。讨论了根际启动作用对SOM分解的影响。

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