Responses of plant community composition and biomass production to warming and nitrogen deposition in a temperate meadow ecosystem.
Responses of plant community composition and biomass production to warming and nitrogen deposition in a temperate meadow ecosystem.
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温带草地生态系统中植物群落组成和生物量生产对变暖和氮沉积的反应。
DOI：
10.1371/journal.pone.0123160
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Sun W
中科院分区：
文献类型：
--
作者：
Zhang T;Guo R;Gao S;Guo J;Sun W
气候变化对植物群落组成和生态系统功能有着深刻的影响。然而，其对植物群落组成和生物量生产的影响还没有得到很好的理解。通过为期4年的野外试验，研究了气候变暖、施氮及其交互作用对中国东北温带草甸生态系统植物群落组成和生物量生产的影响。实验变暖对植物物种丰富度，均匀度和多样性没有显着影响，而氮添加大大降低了物种丰富度和多样性。升温降低了禾本科植物的重要值，但提高了杂类草的重要值，而施氮则相反。增温使地下生物量增加，地上生物量减少。气候变暖对地上生产力的影响取决于降水量。在降水量较高的年份，实验变暖对地上生物量的影响不大，但在干旱年份，显著抑制了地上生物量。我们的结果表明，变暖通过影响水的可用性对植物产量产生间接影响。氮添加显着增加地上和地下生产，表明N是最重要的限制因素之一，决定植物生产力在所研究的草甸草原。还检测到显著的交互作用的变暖加氮地下生物量。研究结果表明，环境变化（变暖和氮沉降）对中国东北温带草甸草原生态系统植物群落组成和生物量生产具有重要的调节作用。
Climate change has profound influences on plant community composition and ecosystem functions. However, its effects on plant community composition and biomass production are not well understood. A four-year field experiment was conducted to examine the effects of warming, nitrogen (N) addition, and their interactions on plant community composition and biomass production in a temperate meadow ecosystem in northeast China. Experimental warming had no significant effect on plant species richness, evenness, and diversity, while N addition highly reduced the species richness and diversity. Warming tended to reduce the importance value of graminoid species but increased the value of forbs, while N addition had the opposite effect. Warming tended to increase the belowground biomass, but had an opposite tendency to decrease the aboveground biomass. The influences of warming on aboveground production were dependent upon precipitation. Experimental warming had little effect on aboveground biomass in the years with higher precipitation, but significantly suppressed aboveground biomass in dry years. Our results suggest that warming had indirect effects on plant production via its effect on the water availability. Nitrogen addition significantly increased above- and below-ground production, suggesting that N is one of the most important limiting factors determining plant productivity in the studied meadow steppe. Significant interactive effects of warming plus N addition on belowground biomass were also detected. Our observations revealed that environmental changes (warming and N deposition) play significant roles in regulating plant community composition and biomass production in temperate meadow steppe ecosystem in northeast China.
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