中国水土保持科学2025，Vol.23Issue(5)：235-242,8.DOI:10.16843/j.sswc.2024117
宁夏输变电塔基植被恢复区土壤微生物残体碳累积及其对有机碳的贡献
Soil microbial necromass carbon accumulation and its contribution to organic carbon in vegetation restoration area of power transmission and transformation tower in Ningxia
摘要
Abstract
[Background]The construction of transmission towers in arid ecosystems has significantly disrupted ecological balance,triggering soil fertility degradation through altered microbial-mediated nutrient cycling.While vegetation restoration serves as a critical intervention for combating desertification and modulating soil microbial communities,its long-term impacts on microbial necromass carbon,a key determinant of soil organic carbon(SOC)persistence and ecosystem stability,remain poorly quantified.[Methods]This study was carried out in the anthropogenic disturbance zone of the power transmission infrastructure within the Mu Us Sandy Land ecosystem.Standardized field sampling protocols coupled with gas chromatography-mass spectrometry(GC-MS)analytical techniques were implemented to evaluate the effects of engineered vegetation restoration on soil carbon.We employed amino sugar biomarkers to analyze microbial necromass dynamics in revegetated soils.By quantitative assessment of microbial residue carbon contributions to SOC,we established relationships between necromass carbon,soil properties,and microbial biomass using variance partitioning and Mantel tests.[Results]1)The results indicated that the microbial necromass carbon content(11.2±0.1 mg/g)in vegetation restoration soil was significantly higher than that in disturbed soil(3.9±0.6 mg/g),and restored to the level of undisturbed soil(8.84±1.3 mg/g).2)The contribution of microbial necromass carbon to soil organic carbon recovered from(21.9%±3.1%)to(50.8%±4.0%),even higher than the undisturbed soil level of(30.0%±5.2%).3)Soil microbial necromass carbon was mainly contributed by fungi,and the contribution of fungal residue carbon to soil organic carbon ranged from 18.3%to 29.8%,and that of bacterial residue carbon ranged from 13.6%to 20.9%.4)The variance decomposition results showed that soil properties and microbial biomass jointly explained 48.3%of the variation in microbial necromass carbon content,in which soil properties explained 35.5%of the variation and microbial biomass explained 27.4%of the variation.Mantel analysis further showed that soil carbon and nitrogen content and microbial biomass carbon were significantly positively correlated with microbial necromass carbon content.[Conclusions]Our findings demonstrate that vegetation restoration not only rehabilitates SOC pools but critically enhances their stability through fungal-dominated microbial necromass accumulation.This mechanistic understanding advances restoration strategies for arid land recovery by highlighting microbial-derived carbon as a fundamental indicator of soil health resilience.关键词
植被恢复/土壤有机碳/氨基糖/微生物残体碳/塔基Key words
vegetation restoration/soil organic carbon/amino sugars/microbial necromass carbon/tower base分类
环境科学引用本文复制引用
陈晓枫,洪倩,钱勇,宗亿宣,史川..宁夏输变电塔基植被恢复区土壤微生物残体碳累积及其对有机碳的贡献[J].中国水土保持科学,2025,23(5):235-242,8.基金项目
国家电网公司总部科技项目"西部典型生态脆弱区输变电工程植被快速恢复技术研究及应用"(5200-202256093A-1-1-ZN) （5200-202256093A-1-1-ZN）
