School of Environment, Beijing Normal University, No. 19, XinJieKouWai St., HaiDian District, Beijing, 100875, China.
School of Environmental and Chemical Engineering, Shanghai University, No. 99, Shangda Road, Baoshan District, Shanghai, 200444, China.
Environ Monit Assess. 2018 Dec 28;191(1):40. doi: 10.1007/s10661-018-7138-9.
The Altun Mountain National Nature Reserve (AMNNR), characterized by complex topography, is located on the northern edge of the Qinghai-Tibetan Plateau. The stocks of soil organic carbon (SOC) and total nitrogen (TN) are critically important for carbon and nitrogen sequestration in dry alpine ecosystems of the AMNNR, which is a "natural laboratory" for assessing the carbon and nitrogen storage without human disturbance. We explored the stocks of SOC and TN in soils of different dry alpine ecosystems by sampling 23 sites across the AMNNR during 2013. The results showed that the SOC and TN stocks of AMNNR varied significantly with ecosystem types. The SOC stocks of 0-15 cm were highest in the alpine wet meadow (7.96 kg/m), followed by alpine steppe (2.63 kg/m). The stocks of SOC and TN in 0-5 and 5-10 cm soils of alpine wet meadow were significantly (P < 0.05) higher than those in the soils of other dry alpine ecosystems. In the whole AMNNR, total storage of SOC and TN were approximately 80.97 and 4.48 Tg, 34.25% of SOC and 24.01% of TN were stored in the alpine steppe, 21.51% of SOC and 26.01% of TN were stored in the alpine scrub, the largest ecosystem in the AMNNR. Our findings suggested it is important to protect the soil and vegetation of the dry alpine ecosystems, particularly the alpine wet meadow and alpine scrub to promote the carbon storage.
阿尔金山国家级自然保护区（AMNNR）以复杂的地形为特征，位于青藏高原的北部边缘。土壤有机碳（SOC）和总氮（TN）储量对于 AMNNR 干旱高山生态系统中的碳和氮固存至关重要，该保护区是评估无人类干扰下碳和氮储存的“天然实验室”。我们通过在 2013 年在 AMNNR 跨 23 个地点采样，探索了不同干旱高山生态系统中土壤的 SOC 和 TN 储量。结果表明，AMNNR 的 SOC 和 TN 储量随生态系统类型而显著变化。0-15cm 土层中 SOC 储量最高的是高山湿地（7.96kg/m），其次是高山草原（2.63kg/m）。高山湿地 0-5cm 和 5-10cm 土壤中 SOC 和 TN 的储量明显（P<0.05）高于其他干旱高山生态系统土壤中的储量。在整个 AMNNR 中，SOC 和 TN 的总储量约为 80.97 和 4.48Tg，SOC 的 34.25%和 TN 的 24.01%储存在高山草原中，SOC 的 21.51%和 TN 的 26.01%储存在 AMNNR 中最大的生态系统高山灌丛中。我们的研究结果表明，保护干旱高山生态系统的土壤和植被，特别是高山湿地和高山灌丛，对于促进碳储存非常重要。
