Multiple and rapid environmental changes in the Arctic have major consequences for the entire ecosystem. Soil water chemistry is one component with important implications for understanding climate feedbacks, plant growth, microbial turnover and net greenhouse gas emissions. Here we assess the contrasting growing season soil water chemistry in a Low arctic Greenlandic mesic tundra heath and a fen, which have been subjected to factorial treatments of summer warming using open top chambers (OTCs), snow addition using snow fences, which increase soil temperature in late winter, and shrub removal mimicking herbivory attack. Dissolved Organic Carbon (DOC) and plant nutrients, including NO₃⁻, NH₄⁺, PO₄²⁺ and total dissolved N were measured during multiple growing seasons (2013–2016) to quantify the treatment effects on nutrient availability in two dominating, but contrasting, vegetation types.

Ambient nutrient concentrations in the mesic tundra heath decreased throughout the growing season and increased during senescence, while concentrations were highest during peak growing season in the fen. The content of NH₄⁺ and DOC were highest in the fen, whereas NO₃⁻ was highest in the mesic tundra heath. The fen had no seasonal pattern.

Summer warming in the mesic tundra heath did not change the availability of nutrients, but in combination with shrub removal, both NO₃⁻ and DOC concentrations increased, likely due to reduced plant uptake. Shrub removal alone increased NO₃⁻ in one growing season, and, combined with snow addition, increased DOC. Significant effects of shrub removal were mostly found in 2016. Snow addition combined with summer warming increased DOC and total N concentrations and highlights the potential loss of dissolved C from the ecosystem.

In the fen, shrub removal alone and combined with summer warming decreased DOC. Snow addition alone and in combination with summer warming similarly decreased DOC.

In the mesic tundra heath, shrub removal caused higher soil water contents in all years. In the dry and warm 2016, it meant <10% soil water content in controls and 15–20% in shrub removal plots during the peak growing season, which may have relieved soil moisture limitation on mineralization rates in the latter.

We conclude that soil water chemistry is vegetation-specific, and that treatment effects are surprisingly limited when comparing multiple years with contrasting precipitation patterns. Herbivory may have larger impact in very dry, warm summers and, together with extreme weather events, exert similar or larger effects than four years of temperature manipulations. The effects of summer warming or increased winter snow depend on ecosystem type and moisture status of the soil. The combination of multi-year and multi-site studies therefore seem important for understanding future biogeochemical dynamics in Arctic landscapes.

北极地区的多种快速环境变化对整个生态系统产生重大影响。土壤水化学是了解气候反馈，植物生长，微生物转化和温室气体净排放量的重要组成部分。在这里，我们评估了低北极格陵兰中性苔原荒地和a的生长季节土壤水化学性质的差异，这些土壤已使用敞顶式顶棚（OTC）进行了夏季变暖的阶乘处理，使用了防雪栅栏进行了除雪，从而提高了土壤温度在冬季晚些时候，灌木丛的去除模仿了草食动物的攻击。溶解有机碳（DOC）和植物营养素，包括NO ₃ ^-，NH ₄ ⁺，PO ₄ ²⁺ 在多个生长季节（2013-2016年）中测量总溶解氮和总溶解氮，以量化两种主要但相对的植被类型对养分利用率的处理效果。

在整个生长季中，中性苔原荒地中的环境养分浓度降低，并在衰老期间增加，而在高峰期，该浓度最高。NH的内容₄ ⁺和DOC分别在最高分，而NO ₃ ^-是在梅西奇苔原健康最高。芬没有季节性模式。

夏季在梅西奇苔原健康升温并没有改变养分的有效性，但与灌木相结合去除，无论是NO ₃ ^-和DOC浓度增加，可能是由于降低了植物吸收。单独灌木清除NO增加₃ ^-在一个生长季节，和，加之雪此外，增加了DOC。灌木清除的重要影响主要在2016年发现。加雪加上夏季变暖增加了DOC和总N的浓度，突显了生态系统中溶解的C的潜在损失。

在市中，单独清除灌木并与夏季变暖相结合，可降低DOC。单独加雪以及与夏季变暖相结合，同样减少了DOC。

在中性苔原荒地中，灌木的清除导致所有年份土壤水含量较高。在2016年干燥温暖的季节，这意味着在生长高峰期，对照中的土壤含水量小于10％，灌木丛中的含水量为15-20％，这可能缓解了土​​壤水分对矿化速率的限制。

我们得出的结论是，土壤水的化学性质是特定于植被的，当比较多年的降水模式与相反的模式时，处理效果出乎意料地受到限制。在非常干燥，温暖的夏天，食草的影响可能会更大，并且与极端天气事件一起，会比四年的温度调节产生相似或更大的影响。夏季变暖或冬季积雪增加的影响取决于生态系统类型和土壤的水分状况。因此，多年研究和多地点研究的结合对于理解北极地区未来的生物地球化学动态似乎很重要。