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首页> 外文期刊>Plant and Soil >Changes in nutrient availability from calcareous to acid wetland habitats with closely related brown moss species: increase instead of decrease in N and P
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Changes in nutrient availability from calcareous to acid wetland habitats with closely related brown moss species: increase instead of decrease in N and P

机译：从钙质湿地到酸性湿地生境以及棕色苔藓物种密切相关的养分有效性变化：氮和磷的增加而不是减少

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摘要

To test whether shifts in nutrient availability from calcareous to mineral-poor habitats could be a driving force in the evolution of seven closely related wetland brown mosses, we measured soil and vascular plant nutrients and conducted a laboratory incubation experiment with Swedish and some Dutch samples, in which net N and P-mineralization, respiration and microbial characteristics were measured. In spite of high respiration and microbial N, net N-mineralization appeared to be low for the calcareous Palustriella falcata and Scorpidium spp. Net N-mineralization significantly increased (and respiration and microbial N decreased) for the mineral-poor Sarmentypnum exannulatum, Straminergon stramineum and Warnstorfia fluitans, probably due to a decrease in microbial N-demand. Even though values were mainly negative, net P-mineralization showed a similar increase from calcareous to mineral-poor fens, probably due to lower precipitation of calcium phosphate. The calcareous habitat of the early wetland mosses may thus have been nutrient-poor instead of nutrient-rich. Adaptation to mineral-poor habitats, probably driven by expansion of mineral-poor wetlands when the boreal zone became colder and wetter, may have been associated with higher availability of ammonium and phosphate. However, this may have stimulated Sphagnum more than brown mosses, which may have been restricted to particular niches with perhaps some nitrification.
机译：为了测试养分从钙质生境到矿物贫乏生境的转移是否可能是七个紧密相关的湿地褐色苔藓进化的驱动力，我们测量了土壤和维管植物的养分，并对瑞典和一些荷兰样本进行了实验室培养实验，其中净氮和磷矿化，呼吸和微生物特征被测量。尽管呼吸和微生物氮含量较高，但石灰性的镰刀菌和蝎形葡萄球菌的净氮矿化作用似乎较低。矿物质稀少的羊膜沙门氏菌，Straminergon stramineum和Warnstorfia fluitans的净N矿化显着增加（并且呼吸和微生物N减少），这可能是由于微生物N需求减少所致。即使该值主要为负值，净磷矿化也显示出从钙质到矿物贫乏的s石类似的增加，这可能是由于磷酸钙的沉淀减少所致。因此，早期湿地苔藓的钙质生境可能营养不足而不是营养丰富。当寒带变冷和变湿时，可能是由于贫矿湿地的扩张而导致的对贫矿生境的适应，这可能与铵和磷酸盐的利用率更高有关。然而，这可能比棕色苔藓对泥炭藓的刺激更多，而棕色苔藓可能仅限于某些具有某些硝化作用的生态位。

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