인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
Grassland degradation disrupts microbial nutrient cycling, yet the role of nitrogen (N) limitation in regulating soil organic carbon (SOC) dynamics during restoration remains poorly understood. Here, 10 years of active (sowing of seeds of native plants) and passive restoration (sand barrier protection) in degraded grasslands on the Qinghai-Tibetan Plateau are compared. Restoration impacts are assessed by integrating microbial metabolic traits such as stoichiometry-based nutrient limitation and C use efficiency (CUE<sub>ST</sub>) with SOC fractionation, which considers both POC and MAOC). Active restoration reduces microbial N limitation by 44-71%, driving a 291-467% increase in SOC stocks, from 0.81 to 3.15 kg m<sup>-2</sup> in topsoil and 0.54 to 3.08 kg m<sup>-2</sup> in subsoil. It also reduces CUE<sub>ST</sub> by 54% in topsoil and 34% in subsoil, boosting POC by 483-557% and MAOC by 621-1,071%. MAOC dominates SOC accumulation, exceeding POC by 2.3-7.2 times. The CUE<sub>ST</sub> reduction aids POC transformation into MAOC, stabilizing SOC storage. In contrast, passive restoration slightly reduces N limitation by 36-39% and CUE<sub>ST</sub> by 10-23%, but failed to enhance C fractions or SOC stocks due to persistent nutrient constraints. The findings demonstrate that alleviating microbial N limitation by active restoration is critical for stabilizing SOC through MAOC accumulation.
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.