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Zn isotope fractionation in a pristine larch forest on permafrost-dominated soils in Central Siberia

机译：西伯利亚中部多年冻土为主的原始落叶松林中的锌同位素分馏

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Stable Zn isotopes fractionation was studied in main biogeochemical compartments of a pristine larch forest of Central Siberia developed over continuous permafrost basalt rocks. Two north- and south-oriented watershed slopes having distinctly different vegetation biomass and active layer depth were used as natural proxy for predicting possible future climate changes occurring in this region. In addition, peat bog zone exhibiting totally different vegetation, hydrology and soil temperature regime has been studied.The isotopic composition of soil profile from Central Siberia is rather constant with a δ66Zn value around 0.2‰ close to the value of various basalts. Zn isotopic composition in mosses (Sphagnum fuscum and Pleurozium schreberi) exhibits differences between surface layers presenting values from 0.14 to 0.2‰ and bottom layers presenting significantly higher values (0.5 – 0.7‰) than the underlain mineral surface. The humification of both dead moss and larch needles leads to retain the fraction where Zn bound most strongly thus releasing the lighter isotopes in solution and preserving the heavy isotopes in the humification products, in general accord with previous experimental and modeling works [GCA 75:7632–7643, 2011].The larch (Larix gmelinii) from North and South-facing slopes is enriched in heavy isotopes compared to soil reservoir while larch from Sphagnum peatbog is enriched in light isotopes. This difference may result from stronger complexation of Zn by organic ligands and humification products in the peat bog compared to mineral surfaces in North- and South-facing slope.During the course of the growing period, Zn followed the behavior of macronutrients with a decrease of concentration from June to September. During this period, an enrichment of larch needles by heavier Zn isotopes is observed in the various habitats. We suggest that the increase of the depth of rooting zone, and the decrease of DOC and Zn concentration in soil solution from the root uptake zone with progressively thawing soil could provoke heavy isotopes to become more available for the larch roots at the end of the vegetative season compared to the beginning of the season, because the decrease of DOC will facilitate the uptake of heavy isotope as it will be less retained in strong organic complexes.
机译：研究了在连续多年冻土玄武岩上发育的西伯利亚中部原始落叶松林主要生物地球化学区室中稳定的锌同位素分馏。利用两个具有明显不同的植被生物量和活动层深度的北向和南向流域斜坡作为自然替代物，以预测该地区未来可能发生的气候变化。此外，还研究了植被，水文和土壤温度状况完全不同的泥炭沼泽地带。西伯利亚中部土壤剖面的同位素组成相当恒定，δ 66 Zn值接近0.2‰，接近各种玄武岩的价值。苔藓中的锌同位素组成（水草和白灵菇）在表层之间的差异介于0.14至0.2‰之间，而底层的差异则明显高于底层矿物质表面（0.5 – 0.7‰）。死苔藓和落叶松针的腐殖化都保留了锌结合最牢固的部分，从而在溶液中释放出较轻的同位素，并在腐殖化产物中保留了重同位素，这与以前的实验和建模工作基本一致[GCA 75：7632 –7643，2011]。与土壤储层相比，北坡和南坡的落叶松（Larix gmelinii）富含重同位素，而泥炭生泥炭沼泽的落叶松则富含轻同位素。造成这种差异的原因可能是泥炭沼泽中有机配体和腐殖化产物对锌的络合作用比与北向和南向斜坡的矿物质表面更强。在生长过程中，锌跟随大量营养素的行为而减少了6月至9月集中。在此期间，在各种生境中观察到重金属锌同位素丰富了落叶松针。我们认为，随着土壤的逐渐融化，生根区深度的增加，以及根吸收区土壤溶液中DOC和Zn浓度的降低，可能会激发重同位素使其更适合于落叶松根的营养与季初相比，因为DOC的减少将促进重同位素的吸收，因为它在强有机络合物中的保留较少。

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