Soil aggregation is more important than mulching and nitrogen application in regulating soil organic carbon and total nitrogen in a semiarid calcareous soil
文献类型：期刊论文
| 作者 | Liu, Zhanjun3; Wang, Mingda3; Zhou, Jianbin3; Chen, Zhujun3; Xu, Xinpeng1; Zhu, Yuanjun2 |
| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2023 |
| 卷号 | 854页码:14 |
| 关键词 | Mulching Nitrogen fertilization Soil aggregate Soil organic carbon Total nitrogen |
| ISSN号 | 0048-9697 |
| DOI | 10.1016/j.scitotenv.2022.158790 |
| 通讯作者 | Liu, Zhanjun(zjliu@nwsuaf.edu.cn) |
| 英文摘要 | Evaluating soil aggregation and microbial activities within soil aggregates contributes to understanding carbon (C) and nitrogen (N) cycling. Here we examined soil aggregate distribution, C and N pools, and extracellular en-zymatic activities (EEAs) in soil aggregates after 16-year mulching (CT, no mulch; RF, plastic-mulched ridges and straw-mulched furrows; SM, straw mulch) and N fertilization (0, 120, and 240 kg ha(-1)). RF and SM signif-icantly increased macroaggregate formation and aggregate stability (MWD, mean weight diameter) but N rate did not. Mulching had similar effects on aggregate-associated SOC (soil organic C) and TN (total N), with the order SM > RF > CT in macroaggregates and macroaggregate-occluded microaggregates. N input significantly increased TN in most cases, whereas its effect on SOC was only significant in SM. Notably, the majority of SOC and TN was isolated in the macroaggregate-occluded silt and clay fractions. SOC, TN, microbial biomass C (MBC), and microbial biomass N (MBN) decreased as aggregate-size decreased, whereas C-and N-acquiring en-zymes varied greatly across aggregate fractions. Mulching had greater effects than N-fertilization on soil C and N pools and EEAs, whilst SM performed more beneficial effects than RF on SOC, TN, MBC, MBN, and EEAs. MBC rather than SOC was associated with MWD in bulk soil, while significant relations between MWD and SOC were observed in macroaggregates and macroaggregate-occluded microaggregates. Partial least squares path modeling illustrated that soil aggregation was the most important factor affecting SOC and TN, followed by mulching and N addition. Regression analysis further revealed that alpha-glucosidase and leucine aminopeptidase were major variables mediating SOC and TN dynamics at the aggregate scale. This study highlights the importance of macroaggregate-occluded microaggregate fraction sensitively evaluating soil C and N dynamics, and straw mulch can effectively increase soil aggregation and stabilization of C and N in semiarid areas with infertile soils. |
| WOS关键词 | MICROBIAL BIOMASS ; SIZE DISTRIBUTION ; ENZYME-ACTIVITIES ; CLIMATE-CHANGE ; SUMMER MAIZE ; TILLAGE ; MATTER ; FERTILIZATION ; PRODUCTIVITY ; MANAGEMENT |
| 资助项目 | National Natural Science Foundation of China[31801937] |
| WOS研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:000884231200005 |
| 出版者 | ELSEVIER |
| 资助机构 | National Natural Science Foundation of China |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/186782]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Liu, Zhanjun |
| 作者单位 | 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China 2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 3.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Zhanjun,Wang, Mingda,Zhou, Jianbin,et al. Soil aggregation is more important than mulching and nitrogen application in regulating soil organic carbon and total nitrogen in a semiarid calcareous soil[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2023,854:14. |
| APA | Liu, Zhanjun,Wang, Mingda,Zhou, Jianbin,Chen, Zhujun,Xu, Xinpeng,&Zhu, Yuanjun.(2023).Soil aggregation is more important than mulching and nitrogen application in regulating soil organic carbon and total nitrogen in a semiarid calcareous soil.SCIENCE OF THE TOTAL ENVIRONMENT,854,14. |
| MLA | Liu, Zhanjun,et al."Soil aggregation is more important than mulching and nitrogen application in regulating soil organic carbon and total nitrogen in a semiarid calcareous soil".SCIENCE OF THE TOTAL ENVIRONMENT 854(2023):14. |
入库方式： OAI收割
来源：地理科学与资源研究所
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