Direct and interaction-mediated effects of environmental changes on peatland bryophytes
Direct and interaction-mediated effects of environmental changes on peatland bryophytes
复制标题
环境变化对泥炭地苔藓植物的直接影响和相互作用介导的影响
DOI：
10.1007/s00442-010-1880-1
复制
发表时间：
2011-06-01
期刊：
影响因子：
2.7
通讯作者：
Chen, Xu
中科院分区：
文献类型：
--
作者：
Bu, Zhao-Jun;Rydin, Hayenkan;Chen, Xu
北部泥炭地生态系统过程在很大程度上受苔藓层活力和物种组成的支配，并可能受到全球变暖和富营养化的影响。在中国东北的一个因子实验中，我们测试了提高氮（0,1和2 g m−2年−1），磷（0,0.1和0.2 g m−2年−1）和温度（环境和+3°C）水平对多毛虫（polytrichum strictum），麦哲伦Sphagnum magellanicumds的影响。Palustre的研究，看看这种效应是否会被不同物种间的相互作用所改变。所有树种的生长均随氮添加量的增加而下降，随磷添加量的增加而增加。对温度升高的反应是侧芽（分枝）的增加。毛蕊、生长和分枝的变化方向相同，但在毛蕊中，这两个响应是不耦合的：添加氮后，毛蕊的生长减少（比毛蕊小），但分枝增加；磷的添加使植株生长加快，但分枝不受影响。P、N、T处理之间不存在双向交互作用。随着温度的升高，我们的结果表明了这一点。相对于toP， palustret应该减小。多毛锥虫分枝增加，具有负邻效应。palustre)。随着磷有效度的略微增加，侧芽的生长和产量增加。strictumandS。麦哲伦可能会给他们带来竞争优势。palustre。对氮的负响应有利于维管植物的生长，而对氮的负响应有利于维管植物的生长。由于其分支的增加，strictum可能会持续存在。
Ecosystem processes of northern peatlands are largely governed by the vitality and species composition in the bryophyte layer, and may be affected by global warming and eutrophication. In a factorial experiment in northeast China, we tested the effects of raised levels of nitrogen (0, 1 and 2 g m−2year−1), phosphorus (0, 0.1 and 0.2 g m−2year−1) and temperature (ambient and +3°C) onPolytrichum strictum, Sphagnum magellanicumandS. palustre, to see if the effects could be altered by inter-specific interactions. In all species, growth declined with nitrogen addition and increased with phosphorus addition, but onlyP. strictumresponded to raised temperature with increased production of side-shoots (branching). InSphagnum, growth and branching changed in the same direction, but inPolytrichum, the two responses were uncoupled: with nitrogen addition there was a decrease in growth (smaller than inSphagnum) but an increase in branching; with phosphorus addition growth increased but branching was unaffected. There were no two-way interactions among the P, N and T treatments. With increasing temperature, our results indicate thatS. palustreshould decrease relative toP. strictum(Polytrichumincreased its branching and had a negative neighbor effect onS. palustre). With a slight increase in phosphorus availability, the increase in length growth and production of side-shoots inP. strictumandS. magellanicummay give them a competitive superiority overS. palustre. The negative response inSphagnumto nitrogen could favor the expansion of vascular plants, butP. strictummay endure thanks to its increased branching.