Moisture regime influence on soil carbon stock and carbon sequestration rates in semi-arid forests of the National Capit
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ORIGINAL PAPER
Moisture regime influence on soil carbon stock and carbon sequestration rates in semi‑arid forests of the National Capital Region, India Urvashi Tomar1 · Ratul Baishya1
Received: 11 September 2018 / Accepted: 23 November 2018 © Northeast Forestry University 2019
Abstract Understanding the dynamics of soil carbon is crucial for assessing the soil carbon storage and predicting the potential of mitigating carbon dioxide from the atmosphere to the biomass and soil. The present study evaluated variations of soil carbon stock in semi-arid forests in India under different moisture regimes. Soil organic carbon (SOC) and soil inorganic carbon (SIC) stocks were determined in different moisture regimes i.e. monsoon, post-monsoon, winter and pre-monsoon seasons at 0–10 and > 10–20 cm depths. SOC stock showed significant variations under different moisture regimes. The highest SOC stock was during winter (22.81 Mg C h a−1) and lowest during the monsoon season (2.34 Mg C ha−1) among all the ridge forests under study. SOC and SIC stock under different moisture regimes showed significant negative correlation with soil moisture (p 10–20 cm were collected and homogenized. Samples were transferred to the laboratory, plant remains and other debris removed, and kept at 4 °C for analysis. Physical and chemical analysis Soil moisture was determined according to Allen et al. (1974) within 48 h of collection. A 10 g sample was ovendried at 105 °C to constant weight. Soil bulk density was estimated by placing a steel core of known volume into the soil. Extra soil adhering to the core was removed from the end of the core. Soil from each depth was collected in separate polybags, and oven-dried at 105 °C until constant weight was achieved. Bulk density was estimated following Anderson and Ingram (1993).
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U. Tomar, R. Baishya
Moisture regime influence on soil carbon stock and carbon sequestration rates in semi‑arid… ◂Fig. 3 Annual carbon stock, mean ± SE (TC, SOC, and SIC) June
2014–May 2017 at two sampling depths on all Delhi ridges. a southern ridge (0–10), b southern ridge (>10–20), c central ridge (0–10), d central ridge (>10–20), e south-central ridge (0–10), f south-central ridge (>10–20), g northern ridge (0–10), h northern ridge (>10–20)
Soil texture was determined by hydrometric method (Allen et al. 1974). A 50-g air-dried 2-mm sieved sample was diluted with 25 ml of 5% sodium hexametaphosphate and 400 ml of distilled water for 15 min on a high-speed stirrer. The contents were transferred to a 1-l measuring cylinder, diluted to volume, stirred 60 s and timed for reading with a bouyoucos soil hygrometer. Initial reading was taken at 4.5 min and final reading at 5 h and temperature corrections applied, i.e., 0.3 units added or subtracted for every degree above or below 19.5 °C. Soil textural class was based on the USDA (2017) soil classification triangle. Air-dried samples were used to estimate total carbon (TC), organic carbon (SOC), and inorganic carbon (SIC). TC was determined using the standard
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