Nitrogen addition decreases seed germination in a temperate steppe
Nitrogen addition decreases seed germination in a temperate steppe
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添加氮会降低温带草原种子的发芽率
DOI：
10.1002/ece3.5151
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发表时间：
2019-07
影响因子：
2.6
通讯作者：
Wang Dong
中科院分区：
文献类型：
--
作者：
Zhong Mingxing;Miao Yuan;Han Shijie;Wang Dong
摘要种子萌发和幼苗建成是植物群落结构和功能对全球变化响应的重要驱动力。氮沉降是全球变化的驱动因子之一，常导致草地生态系统物种丰富度的损失。然而，种子萌发如何响应N添加仍不清楚。2016年5月至10月，在中国北方蒙古高原的半干旱草原上进行了盆栽试验，以研究氮添加量（0、5、10、20、40和80 g N/m2）对种子萌发的影响。20种植物在所有的处理下都发芽了，但是，这20种植物对氮的反应是不同的。克氏针茅、羊草和冷蒿的密度随着施氮量的增加而显著降低。此外，N添加显着抑制幼苗密度的社会，多年生杂类草，多年生禾草，一年生和二年生植物。此外，群落、多年生杂类草、一年生和二年生植物的物种丰富度随着氮添加水平的增加而急剧下降，但多年生禾草的物种丰富度没有变化。Shannon-Wiener多样性指数也随着施氮量的增加而降低。我们的研究结果表明，氮富集在种子萌发阶段起着重要的作用，并减少补充幼苗成年植物。这些结果可能有助于解释大气氮沉降导致草原生态系统物种损失的原因。
Abstract Seed germination and seedling establishment play an important role in driving the responses of plant community structure and function to global change. Nitrogen (N) deposition is one of the driving factors of global change, which often leads to a loss in species richness in grassland ecosystems. However, how seed germination responds to N addition remains unclear. A pot incubation test was conducted in a semi‐arid grassland in the Mongolian Plateau, Northern China, to investigate the effect of N addition (0, 5, 10, 20, 40, and 80 g N/m2) on seed germination from May to October 2016. Twenty species germinated under all treatments; however, the responses of the 20 species to N addition were different. The densities of Stipa krylovii, Leymus chinensis, and Artemisia frigida, which are the dominant species in this temperate steppe, decreased significantly as the amount of N addition. Moreover, N addition significantly suppressed seedling densities of the community, perennial forbs, perennial grasses, and annuals and biennials. Furthermore, species richness of the community, perennial forbs, and annuals and biennials decreased sharply with increasing N addition level, but perennial grass species richness did not change. The Shannon–Wiener diversity index also decreased as the amount of N addition increased. Our results suggest that N enrichment plays an important role in the seed germination stage and decreases supplements of seedlings to adult plants. These findings may help explain the causes of species loss by atmospheric N deposition in grassland ecosystems.
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DOI：
10.1073/pnas.1310880110
发表时间：
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影响因子：
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作者：
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