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Chen G, Zhang QW, Kuan WX, Wang H, Geng R, Wang J, Li M. Variation in dissolved organic matter characteristics of soil aggregates in slip deposition zone with natural succession on a semiarid region. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2025; 380:125040. [PMID: 40120440 DOI: 10.1016/j.jenvman.2025.125040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2024] [Revised: 03/15/2025] [Accepted: 03/15/2025] [Indexed: 03/25/2025]
Abstract
Variations in soil properties of soil slips during vegetation restoration have been tentatively explored. This study explores the impact of successional age in soil slip deposition zones (depth <3 m) on the dissolved organic matter (DOM) characteristics of soil aggregates across different sizes and soil layers. The variation in DOM properties with successional age, soil depth, and aggregate size was examined using UV-visible and excited emission matrix spectral techniques. Overall, dissolved organic carbon (DOC) content in soil aggregates with three sizes increased with successional age, particularly in aggregates larger than 2 mm. The DOC content of soil aggregates was greater in top soil layer (TSL) (0-2 cm) (303.04 mg kg-1) and middle soil layer (MSL) (2-20 cm) (217.81 mg kg-1) than in the bottom soil layer (BSL) (20-50 cm) (75.81 mg kg-1). The molecular weight and aromaticity of soil DOM were gradually increased with the successional age. Parallel factor analysis revealed a gradual increase in humic-like components and a decrease in protein-like components with the successional age. Notable layer differences were observed, with higher humic-like components in TSL (31 %) and MSL (32 %) compared to the BSL (28 %). Particularly, DOM in the TSL and MSL was primarily controlled by plant sources, whereas it was mainly affected by microbial sources for the DOM in the BSL. In this case, the autochthonous characteristics of soil aggregates in the TSL increased and after that decreased with successional age, while vice versa for the MSL and BSL.
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Affiliation(s)
- Guo Chen
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Soil and Water Conservation Science and Engineering (Institute of Soil and Water Conservation), Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Qing-Wei Zhang
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Soil and Water Conservation Science and Engineering (Institute of Soil and Water Conservation), Northwest A&F University, Yangling 712100, Shaanxi, China.
| | - Wen-Xuan Kuan
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Soil and Water Conservation Science and Engineering (Institute of Soil and Water Conservation), Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Hao Wang
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Soil and Water Conservation Science and Engineering (Institute of Soil and Water Conservation), Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Ren Geng
- Sate Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, Jiangsu, China
| | - Jian Wang
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Soil and Water Conservation Science and Engineering (Institute of Soil and Water Conservation), Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Ming Li
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China
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Liu S, Wang R, Yang Y, Shi W, Jiang K, Jia L, Zhang F, Liu X, Ma L, Li C, Yu P. Changes in soil aggregate stability and aggregate-associated carbon under different slope positions in a karst region of Southwest China. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 928:172534. [PMID: 38636852 DOI: 10.1016/j.scitotenv.2024.172534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Revised: 03/29/2024] [Accepted: 04/15/2024] [Indexed: 04/20/2024]
Abstract
Soil aggregates are crucial for reducing soil erosion and enhancing soil organic carbon sequestration. However, knowledge regarding influences of different slope positions on compositions and carbon content for different soil aggregates is limited. Soil samples were collected from various slope positions including dip slope, anti-dip slope and valley depression in the Longtan karst valley of Southwest China. Contents of macroaggregate (> 0.25 mm), microaggregate (0.053-0.25 mm) and silt and clay fraction (< 0.053 mm), and aggregate-associated carbon contents under the three slope positions were measured. Compared to the anti-dip slope, the mean weight diameter under the dip slope and valley depression decreased by 28.48 % and 58.79 %, respectively, while the geometric mean diameter decreased by 39.01 % and 62.57 %, respectively. The mean carbon content in silt and clay fraction was 27.59 % and 21.00 % lower than the macroaggregate- and microaggregate-associated carbon content, respectively. Under the valley depression and dip slope, soil organic carbon contents in bulk soil (37.67 % and 10.36 %, respectively), microaggregate (37.56 % and 4.95 %), and silt and clay fraction (39.99 % and 12.84 %, respectively) were significantly lower than those under the anti-dip slope. However, the difference in macroaggregate-associated carbon content among the three slope positions was not significant. The silt and clay fraction was the major contributor to soil carbon pool in bulk soil in the study area because of its high content. Compared to the anti-dip slope, contribution of macroaggregates to soil carbon pool under the dip slope and valley depression decreased by 25.53 % and 47.95 %, respectively, whereas the contribution of silt and clay fraction increased by 22.68 % and 42.66 %, respectively. These results suggested that the anti-dip slope surpassed both the dip slope and valley depression in carbon sequestration and soil and water conservation in karst regions.
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Affiliation(s)
- Shiwei Liu
- Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, School of Geographical Sciences, Southwest University, Chongqing 400715, China
| | - Rutong Wang
- Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, School of Geographical Sciences, Southwest University, Chongqing 400715, China
| | - Yan Yang
- Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, School of Geographical Sciences, Southwest University, Chongqing 400715, China; Chongqing Key Laboratory of Karst Environment, School of Geographical Sciences, Southwest University, Chongqing 400715, China
| | - Weiyu Shi
- Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, School of Geographical Sciences, Southwest University, Chongqing 400715, China; Chongqing Key Laboratory of Karst Environment, School of Geographical Sciences, Southwest University, Chongqing 400715, China
| | - Ke Jiang
- Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, School of Geographical Sciences, Southwest University, Chongqing 400715, China; Chongqing Key Laboratory of Karst Environment, School of Geographical Sciences, Southwest University, Chongqing 400715, China
| | - Luyao Jia
- Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, School of Geographical Sciences, Southwest University, Chongqing 400715, China
| | - Feng Zhang
- Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, School of Geographical Sciences, Southwest University, Chongqing 400715, China
| | - Xian Liu
- Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, School of Geographical Sciences, Southwest University, Chongqing 400715, China
| | - Lei Ma
- Observation and Research Station of Ecological Restoration for Chongqing Typical Mining Areas, Ministry of Natural Resources, Chongqing Institute of Geology and Mineral Resources, Chongqing 401120, China
| | - Cheng Li
- Observation and Research Station of Ecological Restoration for Chongqing Typical Mining Areas, Ministry of Natural Resources, Chongqing Institute of Geology and Mineral Resources, Chongqing 401120, China
| | - Pujia Yu
- Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, School of Geographical Sciences, Southwest University, Chongqing 400715, China; Chongqing Key Laboratory of Karst Environment, School of Geographical Sciences, Southwest University, Chongqing 400715, China.
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Yang X, Yi X, Ni K, Zhang Q, Shi Y, Chen L, Zhao Y, Zhang Y, Ma Q, Cai Y, Ma L, Ruan J. Patterns and abiotic drivers of soil organic carbon in perennial tea (Camellia sinensis L.) plantation system of China. ENVIRONMENTAL RESEARCH 2023; 237:116925. [PMID: 37598641 DOI: 10.1016/j.envres.2023.116925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 08/08/2023] [Accepted: 08/17/2023] [Indexed: 08/22/2023]
Abstract
Understanding soil organic carbon (SOC), the largest carbon (C) pool of a terrestrial ecosystem, is essential for mitigating climate change. Currently, the spatial patterns and drivers of SOC in the plantations of tea, a perennial leaf crop, remain unclear. Therefore, the present study surveyed SOC across the main tea-producing areas of China, which is the largest tea producer in the world. We analyzed the soil samples from tea plantations under different scenarios, such as provinces, regions [southwest China (SW), south China (SC), south Yangtze (SY), and north Yangtze (NY)], climatic zones (temperate, subtropical, and tropical), and cultivars [large-leaf (LL) and middle or small-leaf (ML) cultivars]. Preliminary analysis revealed that most tea-producing areas (45%) had SOC content ranging from 10 to 20 g kg-1. The highest SOC was recorded for Yunnan among the various provinces, the SW tea-producing area among the four regions, the tropical region among the different climatic zones, and the areas with LL cultivars compared to those with ML cultivars. Further Pearson correlation analysis demonstrated significant associations between SOC and soil variables and random forest modeling (RF) identified that total nitrogen (TN) and available aluminum [Ava(Al)] of soil explained the maximum differences in SOC. Besides, a large indirect effect of geography (latitude and altitude) on SOC was detected through partial least squares path modeling (PLS-PM) analysis. Thus, the study revealed a high spatial heterogeneity in SOC across the major tea-producing areas of China. The findings also serve as a basis for planning fertilization strategies and C sequestration policies for tea plantations.
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Affiliation(s)
- Xiangde Yang
- Tea Research Institute, Chinese Academy of Agriculture Sciences, Key Laboratory of Biology, Genetics and Breeding of Special Economic Animals and Plants, Ministry of Agriculture and Rural Affairs, Hangzhou, 310008, China
| | - Xiaoyun Yi
- Tea Research Institute, Chinese Academy of Agriculture Sciences, Key Laboratory of Biology, Genetics and Breeding of Special Economic Animals and Plants, Ministry of Agriculture and Rural Affairs, Hangzhou, 310008, China
| | - Kang Ni
- Tea Research Institute, Chinese Academy of Agriculture Sciences, Key Laboratory of Biology, Genetics and Breeding of Special Economic Animals and Plants, Ministry of Agriculture and Rural Affairs, Hangzhou, 310008, China
| | - Qunfeng Zhang
- Tea Research Institute, Chinese Academy of Agriculture Sciences, Key Laboratory of Biology, Genetics and Breeding of Special Economic Animals and Plants, Ministry of Agriculture and Rural Affairs, Hangzhou, 310008, China
| | - Yuanzhi Shi
- Tea Research Institute, Chinese Academy of Agriculture Sciences, Key Laboratory of Biology, Genetics and Breeding of Special Economic Animals and Plants, Ministry of Agriculture and Rural Affairs, Hangzhou, 310008, China
| | - Linbo Chen
- Tea Research Institute, Yunnan Academy of Agricultural Sciences, Yunnan Provincial Key Laboratory of Tea Science, 2 Jingnan Road, Menghai, Yunnan, 666201, China
| | - Yuanyan Zhao
- Pu'er Tea Science Research Institute, Pu'er, 665000, China
| | - Yongli Zhang
- Tea Research Institute, Chinese Academy of Agriculture Sciences, Key Laboratory of Biology, Genetics and Breeding of Special Economic Animals and Plants, Ministry of Agriculture and Rural Affairs, Hangzhou, 310008, China
| | - Qingxu Ma
- Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Yanjiang Cai
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou, 311300, China
| | - Lifeng Ma
- Tea Research Institute, Chinese Academy of Agriculture Sciences, Key Laboratory of Biology, Genetics and Breeding of Special Economic Animals and Plants, Ministry of Agriculture and Rural Affairs, Hangzhou, 310008, China.
| | - Jianyun Ruan
- Tea Research Institute, Chinese Academy of Agriculture Sciences, Key Laboratory of Biology, Genetics and Breeding of Special Economic Animals and Plants, Ministry of Agriculture and Rural Affairs, Hangzhou, 310008, China.
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Ma W, Tang S, Dengzeng Z, Zhang D, Zhang T, Ma X. Root exudates contribute to belowground ecosystem hotspots: A review. Front Microbiol 2022; 13:937940. [PMID: 36274740 PMCID: PMC9581264 DOI: 10.3389/fmicb.2022.937940] [Citation(s) in RCA: 62] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 08/30/2022] [Indexed: 09/19/2023] Open
Abstract
Root exudates are an essential carrier for material cycling, energy exchange, and information transfer between the belowground parts of plants and the soil. We synthesize current properties and regulators of root exudates and their role in the belowground ecosystem as substances cycle and signal regulation. We discussed the composition and amount of root exudates and their production mechanism, indicating that plant species, growth stage, environmental factors, and microorganisms are primary influence factors. The specific mechanisms by which root secretions mobilize the soil nutrients were summarized. First, plants improve the nutrient status of the soil by releasing organic acids for acidification and chelation. Then, root exudates accelerated the SOC turnover due to their dual impacts, forming and destabilizing aggregates and MASOC. Eventually, root exudates mediate the plant-plant interaction and plant-microbe interaction. Additionally, a summary of the current collection methods of root exudates is presented.
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Affiliation(s)
- Wenming Ma
- Institute of Qinghai-Tibetan Plateau, Southwest Minzu University, Chengdu, China
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