Abstract
Wetlands regulate the balance of global organic carbon. Small changes in the carbon stocks of wetland ecosystem play a crucial role in the regional soil carbon cycle. However, an accurate estimation of carbon stocks is still be debated for China’s wetlands ecosystem due to the limitation of data collection and methodology. Here, we investigate the soil organic carbon (SOC) storage in a 1-m depth in China’s palustrine wetlands. A total of 1383 sample data were collected from palustrine wetlands in China. The data sources are divided into three parts, respectively, data collection from published literature, data from books, and actual measurement data of sample points. The results demonstrate that there is considerable SOC storage in China’s palustrine wetlands (9.945 Pg C), primarily abundant in the northeast, northwest arid and semi-arid as well as Qinghai-Tibet Plateau regions. The SOC density in per unit area soil was higher in the wetland area of northeast, southwest and Qinghai-Tibet plateau. Within China terrestrial scale, the temperature and precipitation differences caused by latitude were the main environmental factors affecting the organic carbon content. Furthermore, except for the southeast and south wetland region, SOC content decreased with depth.
Highlights
Wetlands are important ecosystems located at the water-land interface, and have a significant effect on regulating the source-sink mechanism of soil organic carbon (SOC) [1]
With respect to optimal water-incubated conditions [2], wetlands, which only account for 5–8% of terrestrial land [3,4], contain 20–30% of soil organic carbon pool [5]
Numerous studies have demonstrated that there are various differences in SOC storage enriched in different geographic regions, which is strongly influenced by vegetation type, landscapes and hydrological conditions [9,10]
Summary
Wetlands are important ecosystems located at the water-land interface, and have a significant effect on regulating the source-sink mechanism of soil organic carbon (SOC) [1]. With respect to optimal water-incubated conditions [2], wetlands, which only account for 5–8% of terrestrial land [3,4], contain 20–30% of soil organic carbon pool [5]. Palustrine wetlands refer to marshes, swamps, bogs, and fens, and are the major wetlands types investigated in this study [6]. Numerous studies have demonstrated that there are various differences in SOC storage enriched in different geographic regions, which is strongly influenced by vegetation type, landscapes and hydrological conditions [9,10].
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