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首页> 外文期刊>Soil Biology & Biochemistry >Long-term microbial control of nutrient availability and plant biomass in a subarctic-alpine heath after addition of carbon, fertilizer and fungicide.
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Long-term microbial control of nutrient availability and plant biomass in a subarctic-alpine heath after addition of carbon, fertilizer and fungicide.

机译：添加碳，肥料和杀真菌剂后，长期对微生物的养分利用率和亚高山-高山荒地植物生物量进行微生物控制。

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摘要

A long-term field experiment lasting more than a decade was conducted on a subarctic fellfield to investigate effects of changes in nutrient availability on soil microbial C, N and P, soil nutrients, vascular plant biomass and plant-microbial interactions. Additions of NPK fertilizer, labile C (sugar) and fungicide (benomyl) were done in a fully factorial design, replicated in six blocks. The treatments were run for ten years and soil and vegetation samples were collected four years after initiating the experiment, and again after an additional 12 years, to evaluate the long-term effects. Labile C addition resulted in increased microbial biomass and nutrient immobilization after four years, and a long-term decrease in vascular plant biomass, thus suggesting the microorganisms to strongly control soil nutrient availability in periods of high microbial biomass. Fertilization increased the inorganic and total soil nutrient pools of N and P and the fine root biomass, but not the total aboveground vascular plant biomass. The vascular plant biomass increased due to benomyl addition thus indicating the plants to be strongly affected by the microbial community. Overall, the effects of benomyl resulted in more lasting changes in the soil compared to labile C and fertilizer addition. In relation to environmental changes, the indicated strong microbial control of the available nutrients in the fellfield ecosystem might limit ecosystem changes due to increased soil nutrient availability as otherwise expected in arctic soils.
机译：在一个弧下的塌陷地上进行了长达十多年的长期田间试验，以调查养分利用率的变化对土壤微生物碳，氮和磷，土壤养分，维管植物生物量以及植物与微生物相互作用的影响。以全因子设计添加了NPK肥料，不稳定的C（糖）和杀真菌剂（苯菌灵），并重复了六个块。处理进行了十年，在开始实验后的第四年和之后的十二年再次收集了土壤和植被样品，以评估长期效果。不稳定碳的添加导致四年后微生物生物量和养分的固定化增加，维管植物生物量的长期减少，因此表明微生物在微生物量高的时期强烈控制土壤养分的利用率。施肥增加了氮和磷的无机和总土壤养分库以及细根生物量，但没有增加地上维管植物的总生物量。由于添加了苯菌灵，维管植物生物量增加，从而表明该植物受到微生物群落的强烈影响。总体而言，与添加不稳定的碳和肥料相比，苯菌灵的作用导致了土壤中更持久的变化。关于环境变化，由于对土壤养分的可利用性增加，如在北极土壤中所期望的那样，对野地生态系统中可用养分的指示性微生物控制可能会限制生态系统的变化。

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