Contrasting effects of N fertilization and mowing on ecosystem multifunctionality in a meadow steppe
Contrasting effects of N fertilization and mowing on ecosystem multifunctionality in a meadow steppe
复制标题
施氮肥和割草对草甸草原生态系统多功能性的影响对比
DOI：
10.1007/s42832-020-0046-2
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发表时间：
2020-12-01
影响因子：
4
通讯作者：
Ling, Xiaoli
中科院分区：
文献类型：
--
作者：
Cui, Haiying;Sun, Wei;Ling, Xiaoli
There is little experimental field evidence on how multiple essential land use intensification drivers (LUIDs), such as nitrogen (N) fertilization and mowing, interact to control ecosystem multifunctionality. Here, we conducted a 4-year field experiment in a meadow steppe in northeast China and evaluated the direct and indirect effects of mowing and N fertilization on a range of ecosystem functions associated with nutrient cycle, carbon stocks, and organic matter decomposition during the past 2 years of the experiment (2017 and 2018). Mowing had negative effects on the ecosystem multifunctionality index (EMF), carbon (C) cycle multifunctionality index (CCMF), and N cycle multifunctionality index (NCMF) in 2 years of sampling. However, in general, the responses of multifunctionality to N fertilization were rate-specific and year-dependent. N fertilization had positive effects on EMF, CCMF, NCMF, and phosphorus (P) cycle multifunctionality index (PCMF) in 2017, with the higher precipitation rate during the growing season, which was likely associated with the strong monsoon season. However, in 2018, EMF, CCMF, and NCMF increased at the lower N fertilization levels ( 10 g N m(-2) yr(-1)), but decreased at higher N rates. N fertilization had consistent positive effects on PCMF in the 2 years ofsampling. The effects ofland use drivers on multifunctionality were indirectly influenced by bacterial biomass, plant richness, and soil moisture changes. Our results also indicated that the impacts of land use drivers on multifunctionality played an important role in maintaining a range of functions at low levels of functioning (
There is little experimental field evidence on how multiple essential land use intensification drivers (LUIDs), such as nitrogen (N) fertilization and mowing, interact to control ecosystem multifunctionality. Here, we conducted a 4-year field experiment in a meadow steppe in northeast China and evaluated the direct and indirect effects of mowing and N fertilization on a range of ecosystem functions associated with nutrient cycle, carbon stocks, and organic matter decomposition during the past 2 years of the experiment (2017 and 2018). Mowing had negative effects on the ecosystem multifunctionality index (EMF), carbon (C) cycle multifunctionality index (CCMF), and N cycle multifunctionality index (NCMF) in 2 years of sampling. However, in general, the responses of multifunctionality to N fertilization were rate-specific and year-dependent. N fertilization had positive effects on EMF, CCMF, NCMF, and phosphorus (P) cycle multifunctionality index (PCMF) in 2017, with the higher precipitation rate during the growing season, which was likely associated with the strong monsoon season. However, in 2018, EMF, CCMF, and NCMF increased at the lower N fertilization levels ( 10 g N m(-2) yr(-1)), but decreased at higher N rates. N fertilization had consistent positive effects on PCMF in the 2 years ofsampling. The effects ofland use drivers on multifunctionality were indirectly influenced by bacterial biomass, plant richness, and soil moisture changes. Our results also indicated that the impacts of land use drivers on multifunctionality played an important role in maintaining a range of functions at low levels of functioning (