Nitrogen addition interacted with salinity-alkalinity to modify plant diversity, microbial PLFAs and soil coupled elements: A 5-year experiment
Nitrogen addition interacted with salinity-alkalinity to modify plant diversity, microbial PLFAs and soil coupled elements: A 5-year experiment
复制标题
添加氮与盐碱度相互作用可改变植物多样性、微生物 PLFA 和土壤耦合元素：一项为期 5 年的实验
DOI：
10.1016/j.apsoil.2019.01.011
复制
发表时间：
2019-05-01
影响因子：
4.8
通讯作者：
Bai, Yuguang
中科院分区：
文献类型：
--
作者：
Gao, Ying;Sun, Shengnan;Bai, Yuguang
在过去的50年里，由于化石燃料的燃烧和合成肥料的使用，大气氮(N)沉降量大大增加。由于N是陆地生态系统中植物生长的限制养分，大气中N的沉积有可能增加生物产量，降低物种丰富度，抑制微生物生长，并导致土壤酸化。然而，很少有研究评估N输入是否以及如何影响盐碱草原生态系统中植物物种多样性和土壤元素之间的相互作用。中国松嫩草原的特点是盐碱地斑块异质。在两个不同的盐碱群落中进行了为期5年的氮沉降试验。结果表明，在低盐碱胁迫群落中，增加氮素输入增加了植物生物量，降低了植物物种丰富度，但盐碱度能够缓解氮素输入对群落多样性的负面影响。植物群落对氮素的添加比微生物群落更敏感。在温带草原生态系统中，氮的添加导致了限制因子从氮向磷的转移。尤其是高胁迫群落的盐碱度提高了N-P限制的转化率。这些结果凸显了全球氮素富集区生态系统中植物-土壤-微生物系统综合研究的重要性。我们的研究强调了未来研究的必要性，以了解在氮素添加和其他胁迫因素(如盐碱度)的组合条件下控制生物地球化学循环和维持生态系统稳定的机制。
Atmospheric nitrogen (N) deposition has greatly increased in the past 50 years due to fossil fuel combustion and the use of synthetic fertilizers. Because N is the limiting nutrient for plant growth in terrestrial ecosystems, atmospheric deposition of N has the potential to increase biomass production, reduce species richness, inhibit microbial growth, and result in soil acidification. However, few studies have evaluated whether and how N inputs affect plant species diversity and the interactions among soil elements in saline-alkaline grassland ecosystems. The Songnen grassland of China is characterized by heterogeneous patches of saline-alkaline soils. A 5-year nitrogen deposition experiment was conducted in two contrasting saline-alkaline communities. Results showed that increasing N input increased the plant biomass production and reduced plant species richness in the low saline-alkaline stress community, but salinity-alkalinity was able to alleviate the negative effects of nitrogen input on community diversity. Plant communities were more sensitive to N addition than microbial communities. N addition induced a shift from N to P as the limiting factor in temperate grassland ecosystems. In particular, salinity-alkalinity in the high stress community increased the conversion rate from N to P limitation. These results highlight the importance of the integrative study of the plant-soil-microbe system in ecosystems under global N enrichment. Our study emphasizes the need for future research to understand the mechanisms that control biogeochemical cycling and maintain ecosystem stability under the combined conditions of N addition and other stress factors, such as saline-alkalinity.