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首页> 外文期刊>The Science of the Total Environment >Divergent responses to water and nitrogen addition of three perennial bunchgrass species from variously degraded typical steppe in Inner Mongolia
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Divergent responses to water and nitrogen addition of three perennial bunchgrass species from variously degraded typical steppe in Inner Mongolia

机译：内蒙古不同退化典型草原上三种多年生束草物种对水和氮添加的不同反应

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摘要

Water and nitrogen (N) availability to plants are spatially and temporally variable in arid and semi-arid grasslands. We aimed to investigate the eco-physiological responses of three bunchgrass species to water and N addition along a gradient of habitat degradation in the Inner Mongolian typical grasslands. The effects of water and N addition on aboveground and belowground growth and biomass allocation and water- and nitrogen-use efficiency (WUE and NUE) of Stipa grandis, Agropyron cristatum and Cleistogenes squarrosa from non-degraded, moderately-degraded and heavily-degraded grasslands, respectively, were compared. Stipa grandis had higher specific root length and WUE than C. squarrosa, while C. squarrosa had higher NUE than S. grandis in waterand N-limited conditions. Responses of A. cristatum were intermediate between those of S. grandis and C. squarrosa. Water and N addition did not have a significant effect on growth and biomass allocation of S. grandis, but it increased growth and leaf biomass allocation of A. cristatum and growth and stem biomass allocation of C. squarrosa. The three species differ in WUE, NUE, biomass allocation and responses to water and N addition, and these differences are adaptive to their respective habitats. The degraded grasslands can be restored by an increase in water and N availability such as is expected to occur via climatic change, but S. grandis will not benefit from the increases. (C) 2018 Elsevier B.V. All rights reserved.
机译：在干旱和半干旱的草原上，植物的水和氮（N）利用率在空间和时间上都是可变的。我们的目的是研究内蒙古典型草原上三种束草物种对水和氮的生态生理响应，以及其生境退化的梯度。水和氮的添加对未退化，中度退化和重度退化草地上针茅，草地早熟禾和油生南瓜的地上和地下生长，生物量分配以及水和氮利用效率（WUE和NUE）的影响分别进行了比较。在水和氮有限的条件下，大针茅的比根长和WUE要比S. squarrosa高，而C. squarrosa的NUE要比S. grandis高。 cristatum的反应介于S. grandis和C. squarrosa之间。水分和氮的添加对刺槐的生长和生物量分配没有显着影响，但是它增加了广A香的生长和叶片生物量分配以及西番莲的生长和茎生物量分配。这三个物种在WUE，NUE，生物量分配以及对水和N添加的响应方面有所不同，这些差异适用于它们各自的生境。退化的草原可以通过增加水和氮的利用来恢复，如通过气候变化预计会发生的那样，但是大叶。不会从这种增加中受益。 （C）2018 Elsevier B.V.保留所有权利。

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