Moisture Effect on Soil Humus Characteristics in a Laboratory Incubation Experiment
文献类型： 外文期刊
作者： Li, Cuilan 1 ; Gao, Shuqing 1 ; Zhang, Jinjing 1 ; Zhao, Lanpo 1 ; Wang, Lichun 1 ;
作者机构： 1.Jilin Agr Univ, Coll Resource & Environm Sci, Changchun 130122, Peoples R China
2.Jilin Acad Agr Sci, Inst Agr Resources & Environm, Changchun, Peoples R China
关键词： humic acid;humin;humus composition;soil moisture;solid-state C-13 NMR
期刊名称：SOIL AND WATER RESEARCH （ 影响因子：2.056； 五年影响因子：1.92 ）
ISSN：
年卷期：
页码：
收录情况： SCI
摘要： A 180-day laboratory incubation experiment (30 degrees C) was conducted to investigate the quantitative and qualitative characteristics of humic fractions in a Mollisol at different moisture conditions. The soil moisture contents were 30, 60, and 250% field water-holding capacity (WHC), which represented the low, middle, and high moisture levels, respectively. The results showed that the carbon contents of the total soil and corresponding humic fractions generally decreased with increasing soil moisture. A significant difference was observed between the 250% WHC and the two other moisture levels. By contrast, the carbon content of the water soluble fraction significantly increased with increasing soil moisture levels. The solid-state C-13 nuclear magnetic resonance (NMR) spectra showed that the alkyl C/O-alkyl C, aliphatic C/aromatic C, and hydrophobic C/hydrophilic C ratios were in the order of 250% WHC > 30% WHC approximate to 60% WHC, 30% WHC approximate to 60% WHC > 250% WHC and 250% WHC > 60% WHC approximate to 30% WHC for humic acid, and 250% WHC > 30% WHC approximate to 60% WHC, 60% WHC approximate to 250 % WHC > 30% WHC and 30% WHC approximate to 250% WHC > 60% WHC for humin, respectively. These results indicated that a high moisture level was unfavourable for the carbon accumulation of the total soil and humic fractions, whereas it was favourable for the accumulation of water soluble carbon. Although soil moisture levels had a distinct effect on the chemical composition of humic acid and humin, the decomposition degree of the two humic substances components, as indicated by the alkyl C/O-alkyl C ratio, were both higher at a high moisture level than at a low moisture level. Therefore, the lower soil organic carbon content at a high moisture level than at a low moisture level can be ascribed to the higher water soluble carbon content and larger decomposition degree of humic acid and humin in the former. Our results are important for understanding the behaviour and mechanisms of humic substances at specific soil moisture conditions.
- 相关文献
作者其他论文 更多>>
-
Response of Soil Nitrogen Components and nirK- and nirS-Type Denitrifying Bacterial Community Structures to Drip Irrigation Systems in the Semi-Arid Area of Northeast China
作者：Qiang, Ruowen;Li, Yingjie;Sun, Huixian;Liang, Wenyu;Li, Cuilan;Zhang, Jinjing;Liu, Hang;Wang, Meng;Li, Qian
关键词：drip irrigation; nirS gene; nirK gene; nitrate reductase; N components
-
The different responses of AOA and AOB communities to irrigation systems in the semi-arid region of Northeast China
作者：Qiang, Ruowen;Li, Yingjie;Li, Cuilan;Zhang, Jinjing;Liu, Hang;Wang, Meng;Li, Qian
关键词：mulched drip irrigation; AOA; AOB; community composition; symbiotic network
-
Comammox dominate soil nitrification under different N fertilization regimes in semi-arid areas of Northeast China
作者：Feng, Xuewan;Tan, Pan;Liu, Hang;Li, Cuilan;Zhang, Jinjing;Wang, Meng;Li, Qian;Qin, Yubo;Sun, Bo
关键词：N fertilization gradient; Comammox; AOA; AOB; Nitrification contribution rate
-
Effects of Nitrogen Fertilizer on Nitrospira- and Nitrobacter-like Nitrite-Oxidizing Bacterial Microbial Communities under Mulched Fertigation System in Semi-Arid Area of Northeast China
作者：Yuan, Yuhan;Feng, Xuewan;Li, Cuilan;Zhang, Jinjing;Liu, Hang;Wang, Meng;Li, Qian;Qin, Yubo;Sun, Bo
关键词：N fertilizer application rate; nitrite-oxidizing bacteria (NOB); Nitrospira-like NOB; Nitrobacter-like NOB; nitrite oxidoreductase; nitrite oxidation potential (PNO)
-
The Relationship of Soil Organic Carbon and Nutrient Contents to Maize Yield as Affected by Maize Straw Return Modes
作者：Wang, Chuanyu;Geng, Yidan;Zhang, Jinjing;Liang, Yao;Liu, Jianzhao;Yuan, Jingchao;Ren, Jun;Cai, Hongguang;Shao, Zeqiang
关键词：crop residue; soil property; causal relationship; soil depth; maize monoculture
-
Rice Straw Biochar is More Beneficial to Soil Organic Carbon Accumulation and Stabilization than Rice Straw and Rice Straw Ash
作者：He, Mengru;Jiang, Ya;Han, Yuhang;Zhu, Wenhao;Meng, Da;Li, Cuilan;Zhang, Jinjing;Cai, Hongguang
关键词：Soil organic carbon fractions; Soil aggregate-size classes; Soil particle-size classes; Rice straw biochar; C-13 nuclear magnetic resonance spectroscopy
-
Dynamics of soil properties and bacterial community structure by mulched fertigation system in semi-arid area of Northeast China
作者：Wang, Ling;Zhang, Jinjing;Li, Cuilan;Yuan, Yuhan;Tan, Pan;Liu, Hang;Wang, Meng;Li, Qian
关键词：Bacterial community; Illumina MiSeq sequencing; Mulched fertigation; Soil properties
