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首页> 外文期刊>Ecological research >Changes in stable nitrogen isotopes of plants, bulk soil and soil dissolved N during ecosystem retrogression in boreal forest
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Changes in stable nitrogen isotopes of plants, bulk soil and soil dissolved N during ecosystem retrogression in boreal forest

机译：植物林生态系统倒退期间植物稳态氮同位素的变化，散装土壤和土壤溶解N

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Stable nitrogen isotope ratios (delta N-15) of plants and soil have been used to study changes in the N cycle during ecosystem succession and retrogression. However, little is known about how delta N-15 of soil mineral N and dissolved organic N (DON) change during retrogression, despite their potential to inform on processes contributing to N loss. Here, we examined the delta N-15 of NH4+ and DON together with delta N-15 of the dominant plant species and bulk soil across a 5,000-year-old retrogressive chronosequence of forested islands in northern Sweden. The delta N-15 of bulk soil N, NH4+ and DON did not change greatly during retrogression, suggesting that there are no major losses of N from the system. The delta N-15 of NH4+ and DON was significantly correlated with that of bulk soil N across islands, indicating that bulk soil N is an important determinant of the delta N-15 of dissolved soil N. The delta N-15 of DON was significantly higher than those of NH4+ and bulk soil N, probably because of the inclusion of microbial N to the DON fraction. Despite the lack of changes in delta N-15 of soil N as retrogression proceeded, the delta N-15 of most plant species increased. These results suggest that despite the relative importance of the three underlying mechanisms involved is unclear, the N resources of plants change in response to retrogression: they have an increasing reliance on DON, a decreasing dependence on N transferred from the mycorrhizal fungi and reduced reliance on N from surface soil layers as retrogression proceeds.
机译：稳定的氮同位素比（Delta N-15）植物和土壤已用于在生态系统连续和倒置期间研究N个循环的变化。然而，尽管有可能通知有助于N损失的过程，但迄今为止如何讨论倒退的土壤矿物质N-15和溶解的有机N（Don）变化。在这里，我们研究了NH4 +的δn-15，并与瑞典北部森林岛屿的5,000岁的倒退的倒退的倒退时间中的达到植物种类和散装土壤中的Δn-15一起。散装土壤N，NH4 +和Don的δn-15在倒退期间没有大幅变化，表明系统中没有N的主要损失。 NH4 +和DON的Delta N-15与岛上的散装土N显着相关，表明散装土壤N是溶解土壤N-15的重要决定因素。DON的DELTA N-15显着高于NH4 +和散装土N的高，可能是因为将微生物N包含到唐馏分。尽管δn-15的土壤N作为倒退进行的δn-15缺乏变化，但大多数植物种类的δn-15增加。这些结果表明，尽管有三种涉及的潜在机制的相对重要性尚不清楚，但植物的N个资源对倒退的反应变化：他们对唐越来越依赖，对N的依赖性从菌根真菌转移并降低依赖从表面土层中的返回争吵进行。

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