Data for: Reburning before recovery: Effects of short-interval fire on subalpine forest nitrogen stocks and fluxes

In forests adapted to infrequent (>100-yr) stand-replacing fires, novel short-interval (<30-yr) fires have started to burn young forests before they recover from previous burns. Postfire tree regeneration is reduced, plant communities shift, soils are hotter and drier, but effects on biogeochemical cycling are unresolved. This study focused on how postfire nitrogen (N) stocks, N availability and N fixation varied in lodgepole pine (Pinus contorta var. latifolia) forests burned at long and short intervals in Grand Teton National Park (Wyoming, USA). This data package includes our field data from 2021 and 2022, along with laboratory analyses of foliar and litter chemistry, resin-sorbed N, and field measurements of N fixation. The data included here were also used to compute aboveground N stocks. Our study found that short-interval fires reduced and repartitioned aboveground N stocks, but soil N stocks were unaffected. Results indicate that these shifts in N pools and fluxes suggest reburns can markedly alter N cycling in subalpine forests. The citation for the publication associated with these data is:
Turner, M. G., R. E. Heumann, N. G. Kiel, J. A. Warren, and C. C. Cleveland. Reburning before recovery: Effects of short-interval fire on subalpine forest nitrogen stocks and fluxes. Ecosystems (In press)

在适应间隔期超过100年的罕见林分更替型火灾的森林中，新型短间隔（<30年）火灾开始在幼林完成前次火灾后的恢复前便将其烧毁。火灾后树木更新量减少，植物群落发生演替，土壤温度升高且湿度降低，但此类火灾对生物地球化学循环的影响尚未明确。
本研究以美国怀俄明州大提顿国家公园内经历长、短间隔火灾的扭叶松（Pinus contorta var. latifolia）林分为对象，探究火灾后氮（N）储量、氮有效性及固氮作用的变化规律。本数据集包含2021年与2022年的野外实测数据，以及叶片与枯落物化学性质、树脂吸附态氮的实验室分析结果，还有固氮作用的野外测定数据。本次收录的数据同时被用于计算地上氮储量。
研究结果显示，短间隔火灾会减少并重新分配地上氮储量，但土壤氮储量未受显著影响。上述氮库与通量的变化表明，复燃火灾可显著改变亚高山森林的氮循环过程。
本数据集关联的已发表文献引用信息如下：
Turner, M. G., R. E. Heumann, N. G. Kiel, J. A. Warren, 及 C. C. Cleveland. 《恢复前的再次火烧：短间隔火灾对亚高山森林氮储量与通量的影响》. Ecosystems（已接收待刊）