Straw Strip Mulching Increased Soil Organic Carbon Components of a Wheat Field in Dry Farming Regions of the Loess Plateau
2. Materials and Methods
2.1. Site Description
2.2. Experimental Design and Field Management
2.3. Sampling and Measurements
- Soil organic carbon (SOC): weigh 0.1 g soil sample passed with 0.25 mm sieve, treat it and then analyze it using an organic carbon analyzer (TOC-2000, Shanghai Metash Instruments Co., Ltd. Shanghai, China).
- Soil microbial biomass carbon (MBC): according to the reference , the chloroform fumigation method was used. Weigh 25 g fresh soil passed through a 2 mm sieve in a beaker, carry out chloroform fumigation in a desiccator and set up a control treatment without fumigation. After one day, add 0.5 mol·L−1 K2SO4 solution to extract and compute the MBC content by shaking, filtration and titration with FeSO4 solution (0.5 mL·L−1) after heating.
- Soil dissolved organic carbon content (DOC): according to the reference , DOC was measured through the cold-water leaching method. Weigh 10 g fresh soil passed through a 2 mm sieve into a centrifuge tube and add 50 mL of deionized water at room temperature. Shake and centrifuge the tube, pass the supernatant with a 0.45-μm filter membrane, and place the filtrate in a total organic carbon (TOC) analyzer for determination.
- Soil easily oxidized carbon content (EOC): the KMnO4 oxidation method was used . Weigh 1.5 g soil sample passed through a 0.25 mm sieve in a centrifuge tube, add 25 mL of potassium permanganate solution (the concentration was 333 mmol·L−1), shake and centrifuge the tube at room temperature, separate out the supernatant and add deionized water at a ratio of 1:250, colorimetrically analyze the diluted solution using a Visible Spectrophotometer (V1800, Unico (Shanghai) Instruments Co., Ltd. Shanghai, China) at a wavelength of 565 nm; repeat three times and calculate oxidized carbon content of the sample according to the change in the KMnO4 concentration.
- Soil mineralizable carbon content (PCM): the incubation method was used . Weigh 10 g soil sample passed through a 2 mm sieve in a beaker, fill it to 60% of the field capacity, place the sample in a culture flask, add 4 mL of 0.5 mol·L−1 NaOH solution to the flask and incubate this under airtight conditions for 10 days. After 10 days, titrate the mixture with BaCl2 solution at a concentration of 1.5 mol·L−1 and 0.1 mol·L−1 HCl, calculate the amount of CO2 absorbed by the NaOH solution and calculate the mineralized organic carbon content.
2.4. Data Analysis
3.1. Differences in SOC Contents under Different Mulching Treatments
3.2. Differences in MBC Contents under Different Mulching Treatments
3.3. Differences in DOC Content under Different Mulching Treatments
3.4. Differences in PCM Content under Different Mulching Treatments
3.5. Differences in EOC Contents under Different Mulching Treatments
4.1. Effects of Mulching on SOC
4.2. Effects of Mulching on MBC
4.3. Effects of Mulching on DOC
4.4. Effects of Mulching on PCM and EOC
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Huang, C.; Cheng, C.; Wang, Z.; Zhao, X.; Yang, Y.; Hu, L.; Li, Y.; Ma, J.; Wang, L.; Chang, L.; Ye, Y.; Zhang, H. Straw Strip Mulching Increased Soil Organic Carbon Components of a Wheat Field in Dry Farming Regions of the Loess Plateau. Water 2022, 14, 2645. https://doi.org/10.3390/w14172645
Huang C, Cheng C, Wang Z, Zhao X, Yang Y, Hu L, Li Y, Ma J, Wang L, Chang L, Ye Y, Zhang H. Straw Strip Mulching Increased Soil Organic Carbon Components of a Wheat Field in Dry Farming Regions of the Loess Plateau. Water. 2022; 14(17):2645. https://doi.org/10.3390/w14172645Chicago/Turabian Style
Huang, Caixia, Chipi Cheng, Zeyi Wang, Xia Zhao, Yong Yang, Liangliang Hu, Yazhen Li, Juhua Ma, Longlong Wang, Lei Chang, Yuansheng Ye, and Hengjia Zhang. 2022. "Straw Strip Mulching Increased Soil Organic Carbon Components of a Wheat Field in Dry Farming Regions of the Loess Plateau" Water 14, no. 17: 2645. https://doi.org/10.3390/w14172645