Yinshanbeilu Grassland Eco-Hydrology National Observation and Research Station, China Institute of Water Resources and Hydropower Research, A-1 Fuxing Road, Haidian District, Beijing, 100038, China.
Institute of Water Resources for Pastoral Area Ministry of Water Resources, Hohhot, 010020, China.
Sci Rep. 2024 Sep 27;14(1):22196. doi: 10.1038/s41598-024-73018-2.
We aimed to explore the mineralization characteristics of soil organic carbon(SOC) under different plant species in semi-arid grassland and provide basic soil carbon cycling data. Leymus chinensis, Stipa krylovii Roshev, Artemisia frigida, and Agrophorn cristam (L.) Gaertn were selected as the plant species. Incubation experiment were conducted on SOC mineralization in soil aggregates with particle sizes of > 2, 1-2, 0.25-1, and < 0.25 mm. The cumulative SOC mineralization amount in L. chinensis with a particle size > 2 mm was the highest, exceeding that of A. cristam (L.) Gaertn by approximately 136.14%. S. krylovii Roshev (70.73%), L. chinensis (58.05%), and A. frigida (33.73%) exhibited pronounced promotion effects on mineralization. The potential SOC mineralization of S. krylovii Roshev was the greatest among all species at the same soil particle size. The potential SOC mineralization was highest at a particle size of > 2 mm for all plant types. All plant types increased the SOC mineralization rate and cumulative mineralization in soils with large particle sizes, the mineralization reaction occurred more strongly. Organic carbon cumulative SOC mineralization rapidly increased in all tests during the first 20 days and gradually slowed thereafter.
我们旨在探索半干旱草原不同植物物种下土壤有机碳（SOC）的矿化特征，为土壤碳循环提供基础数据。选择了羊草、克氏针茅、冷蒿和冰草作为植物物种。在粒径为>2、1-2、0.25-1 和<0.25 毫米的土壤团聚体中进行了 SOC 矿化的孵育实验。粒径>2 毫米的羊草的累积 SOC 矿化量最高，比冰草（L.）Gaertn 高出约 136.14%。克氏针茅（70.73%）、羊草（58.05%）和冷蒿（33.73%）对矿化有明显的促进作用。在相同土壤粒径下，克氏针茅的潜在 SOC 矿化量最大。所有植物类型的潜在 SOC 矿化量在粒径>2 毫米时最高。所有植物类型都增加了大粒径土壤中的 SOC 矿化率和累积矿化量，矿化反应更强烈。在所有试验中，SOC 有机碳的累积矿化在最初 20 天内迅速增加，此后逐渐减缓。
