Factors controlling the contributions of bacterial and fungal residue carbon to soil organic carbon in grassland ecosystems
文献类型： 外文期刊
作者： Yu, Yingchao 1 ; Pan, Junxiao 1 ; Wu, Honghui 3 ; Zhu, Juntao 1 ; Zong, Ning 1 ; An, Hui 5 ; Wang, Changhui 6 ; Zuo, Xiaoan 7 ; Wei, Cunzheng 8 ; Zhang, Fawei 9 ; Liu, Shuang 1 ; Liu, Jielin 10 ; Diao, Huajie 6 ; Zhang, Bo 11 ; Yu, Qiang 12 ; Zhang, Xinyu 1 ;
作者机构： 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China
3.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, State Key Lab Efficient Utilizat Arid & Semiarid A, Beijing 100081, Peoples R China
4.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Minist Agr & Rural Affairs, Key Lab Arable Land Qual Monitoring & Evaluat, Beijing 100081, Peoples R China
5.Land Degradat & Ecol Restorat Northwestern, Breeding Base State Key Lab, Yinchuan 750021, Ningxia, Peoples R China
6.Shanxi Agr Univ, Coll Grassland Sci, Taigu 030801, Peoples R China
7.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Urat Desert Grassland Res Stn, Lanzhou 730000, Peoples R China
8.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
9.Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810008, Peoples R China
10.Heilongjiang Acad Agr Sci, Prataculture Res Inst, Harbin 150086, Peoples R China
11.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Cele Natl Stn Observat & Res Desert Grassland Ecos, Urumqi 830011, Peoples R China
12.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Natl Hulunber Grassland Ecosyst Observat & Res Stn, Beijing 100081, Peoples R China
13.Beijing Forestry Univ, Sch Grassland Sci, Beijing 100083, Peoples R China
关键词： Fungal residue carbon; Bacterial residue carbon; Extracellular enzyme activity; Soil C/N; Alpine grassland; Temperate grassland
期刊名称：CATENA （ 影响因子：5.4； 五年影响因子：5.9 ）
ISSN： 0341-8162
年卷期： 2024 年 241 卷
页码：
收录情况： SCI
摘要： Soil microbial residue carbon (MRC) plays an important role in the accumulation and stabilization of soil organic carbon (SOC) in grassland ecosystems. Numerous studies to date show that soil bacterial MRC and fungal MRC have different effects on SOC stability, however, there is a lack of understanding about what regulates the contributions of the bacterial MRC and fungal MRC to SOC in large-scale grassland ecosystems. In this study, we selected nine alpine and temperate grassland ecosystems to quantify the effects of biotic (plant and microbial) and abiotic (climate and soil) factors on the bacterial and fungal MRC/SOC. The results showed that 1) Both biotic and abiotic factors explained 97% and 89% of the variations in the bacterial MRC/SOC and fungal MRC/ SOC, respectively. Compared with the fungal MRC/SOC, the bacterial MRC/SOC could be explained more by the biotic and abiotic factors. 2) The bacterial MRC/SOC was clearly correlated with climate and increased as the mean annual temperature increased and decreased as the mean annual precipitation increased. The bacterial MRC/SOC was negatively correlated with the soil phosphorus stoichiometry. 3) The fungal MRC/SOC was significantly correlated with mean annual temperature and was negatively correlated with the ratio of carbon to nitrogen. Our study demonstrates that the bacterial and fungal MRC/SOC respond differently to environmental changes, which can contribute to the regulation of soil carbon sequestration in grassland ecosystems by modulating different soil microbial communities under climate change.
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