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| Variation and influencing factors of desert-sierozem soil inorganic carbon in different tillage years in the Qitai Oasis，Xinjiang，China |
| Received:April 17, 2023 |
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| KeyWord:desert-sierozem;soil inorganic carbon;different tillage years;secondary carbonate;carbon sequestration potential |
| Author Name | Affiliation | E-mail | | PENG Kang | College of Geography and Remote Sensing Sciences, Xinjiang University, Urumqi 830046, China
Xinjiang Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi 830046, China | | | ZHANG Feifei | College of Geography and Remote Sensing Sciences, Xinjiang University, Urumqi 830046, China
Xinjiang Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi 830046, China | | | SHAO Zhidong | College of Geography and Remote Sensing Sciences, Xinjiang University, Urumqi 830046, China
Xinjiang Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi 830046, China | | | ZHANG Fang | College of Geography and Remote Sensing Sciences, Xinjiang University, Urumqi 830046, China
Xinjiang Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi 830046, China | zhangf602@163.com |
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| Abstract: |
| The soil in the northern piedmont plain of the Tianshan Mountains is desert-sierozem soil, characterized by high levels of carbonate salt and calcium sulfate, is a high-quality land reserve resource. In this study, via field investigations and laboratory experiments, we analyzed the variations of, and factors influencing, soil inorganic carbon in desert-sierozem at different tillage years（<3 a, 10 a, 20 a, 30 a, >40 a）in Qitai Oasis, Xinjiang. The relationship between soil inorganic carbon and soil physical and chemical parameters was discussed, especially, the effect of gypsum on the increase of soil inorganic carbon accumulation. The inorganic carbon in the arable and plow layers was found to be very sensitive to human farming activities. Soil inorganic carbon decreased rapidly after the first 10 a of tillage and then increased with the increase in tillage years, gradually shifting from a carbon source to a carbon sink. After tillage >40 a, the soil inorganic carbon content increased by more than 10 g·kg-1 compared with tillage <3 a. The levels of the stable isotope δ13C of soil inorganic carbon continued to shift negatively with the increase in tillage years, showing the potential of this land to sequester modern atmospheric CO2. Desert-sierozem contained considerable quantities of easily weatherable gypsum, which provided a large amount of calcium for secondary carbonate deposition; the levels of Ca2+ determined the final capacity of the soil inorganic carbon pool in the study area. In summary, gypsum-rich desert-sierozem soil has a strong potential for increasing soil inorganic carbon sequestration after cultivation. Accurately estimating the potential of such carbon sinks will contribute towards achieving China’s“dual-carbon”goal. |
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