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Extreme-duration drought impacts on soil CO2 efflux are regulated by plant species composition

机译：植物物种组成对土壤二氧化碳流出的极端干旱撞击

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AimsLong-duration drought can alter ecosystem plant species composition with subsequent effects on carbon cycling. We conducted a rainfall manipulation field experiment to address the question: how does drought-induced vegetation change, specifically shrub encroachment into grasslands, regulate impacts of subsequent drought on soil CO2 efflux (R-s) and its components (autotrophic and heterotrophic, R-a and R-h)?MethodsWe conducted a two-year experiment in Inner Mongolia plateau, China, using constructed steppe communities including graminoids, shrubs and their mixture (graminoid + shrub) to test the effects of extreme-duration drought (60-yr return time) on R-s, R-h and R(a.)ResultsOur results indicated that extreme-duration drought reduced net primary production, with subsequent effects on R-s, R-h and R-a in all three vegetation communities. There was a larger relative decline in R-a (35-54%) than R-s (30-37%) and R-h (28-35%). Interestingly, we found R-s in graminoids is higher than in shrubs under extreme drought. Meanwhile, R-h declines were largest in the shrub community. Although R-a and R-h both decreased rapidly during drought treatment, R-h recovered quickly after the drought, while R-a did not, limiting the R-s recovery.ConclusionsThis study suggests that plant species composition regulates several aspects of soil CO2 efflux response to climate extremes. This regulation may be limited by above- and below-ground net primary production depending on soil water availability. The results of this experiment address a critical knowledge gap in the relationship between soil respiration and plant species composition. With shrub encroachment into grasslands, total soil respiration is reduced and can partly offset the effect of reduction in productivity under drought stress.
机译：Aimslong-持续时间干旱可以改变生态系统植物物种组成，随后对碳循环的影响。我们进行了一个降雨处理领域实验来解决问题：如何促进植被植被变化，特别是灌木侵占到草原上，调节后续干旱对土壤二氧化碳流出（RS）及其组分的影响（自身营养和异养，RA和RH）。 ？方法网络在中国内蒙古高原进行了两年的实验，采用了由麦片骨，灌木及其混合物（禾本科+灌木）在内的构建的草原社区，以测试rs的极端干旱（60-YR返回时间）的影响， RH和R（a。）结果结果表明，极端持续时间干旱降低了净初级生产，随后对所有三个植被社区的RS，RH和RA的效果。 R-S（35-37％）和R-H（28-35％）的相对下降较大。有趣的是，我们发现R-S在禾本科高于极端干旱下的灌木。同时，灌木界的R-H下降最大。虽然干旱治疗过程中R-A和R-H迅速下降，但干旱后，R-H快速恢复，而R-A没有，但限制R-S恢复。结论，植物物种组成调节土壤二氧化碳排出响应气候极端的几个方面。根据土壤水可用性，该调节可能受到上下净初级生产的限制。该实验的结果解决了土壤呼吸与植物物种组成之间关系的关键知识差距。随着灌木侵占到草地，整个土壤呼吸降低，可以部分地抵消干旱胁迫下生产率降低的效果。

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