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Reproduction strategy of Chloris virgata under simulated atmospheric nitrogen deposition

机译：模拟大气氮沉降下虎尾草的繁殖策略

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Atmospheric nitrogen (N) deposition is an important issue of global climate change and it will significantly affect plant growth and reproduction, resulting in damage to ecological systems. However, little attention has been given to the effects of this factor on plant reproductive strategies. We investigated how variation in atmospheric N deposition affects the reproductive strategy of Chloris virgata (feathertop Rhodes grass). We simulated atmospheric N deposition to evaluate the trade-off between seed size and seed number, as well as its effects on offspring vigour. We found significant negative correlations between seed size and seed number per spike in the control and 20.0gNm(-2) treatments, as well as between seed size and seed number per plant in the control treatment. Seed number and seed weight per spike behaved similarly and were significantly lower in the control and 20.0gNm(-2) treatments than in the other N supply treatments. Spike number and seed yield behaved similarly, and the greatest gains in these values occurred from 2.5 to 20.0gNm(-2). Seed size reached its maximum values at low and high N levels, whereas seed N concentrations increased with N level. Although the germination percentage remained stable under different N levels, the highest germination rate occurred in the control treatment. Our findings showed that simulated atmospheric N deposition affected the reproductive pattern and seed vigour of C. virgata.
机译：大气氮沉积是全球气候变化的一个重要问题，它将严重影响植物的生长和繁殖，从而破坏生态系统。但是，很少有人对该因子对植物繁殖策略的影响给予关注。我们调查了大气氮沉降的变化如何影响虎尾草（羽顶罗得草）的繁殖策略。我们模拟了大气氮沉降，以评估种子大小和种子数量之间的权衡，以及其对后代活力的影响。我们在对照和20.0gNm（-2）处理中发现种子大小与每个穗的种子数之间显着负相关，在对照处理中发现种子与种子大小与每株植物的种子数之间显着负相关。种子数量和每个穗的种子重量表现相似，并且在对照和20.0gNm（-2）处理中显着低于其他氮供应处理。穗数和种子产量表现相似，这些值的最大增幅发生在2.5至20.0gNm（-2）之间。在低氮水平和高氮水平下，种子大小均达到最大值，而氮含量随氮水平的增加而增加。虽然在不同的氮水平下发芽率保持稳定，但在对照处理中发芽率最高。我们的研究结果表明，模拟的大气N沉积会影响C. virgata的繁殖方式和种子活力。

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