Abstract
BackgroundLand use change plays a vital role in global carbon dynamics. Understanding land use change impact on soil carbon stock is crucial for implementing land use management to increase carbon stock and reducing carbon emission. Therefore, the objective of our study was to determine land use change and to assess its effect on soil carbon stock in semi-arid part of Rajasthan, India. Landsat temporal satellite data of Pushkar valley region of Rajasthan acquired on 1993, 2003, and 2014 were analyzed to assess land use change. Internal trading of land use was depicted through matrices. Soil organic carbon (SOC) stock was calculated for soil to a depth of 30 cm in each land use type in 2014 using field data collection. The SOC stock for previous years was estimated using stock change factor. The effect of land use change on SOC stock was determined by calculating change in SOC stock (t/ha) by deducting the base-year SOC stock from the final year stock of a particular land use conversion.ResultsThe total area under agricultural lands was increased by 32.14% while that under forest was decreased by 23.14% during the time period of 1993–2014. Overall land use change shows that in both the periods (1993–2003 and 2003–2014), 7% of forest area was converted to agricultural land and about 15% changes occurred among agricultural land. In 1993–2003, changes among agricultural land led to maximum loss of soil carbon, i.e., 4.88 Mt C and during 2003–2014, conversion of forest to agricultural land led to loss in 3.16 Mt C.ConclusionThere was a continuous decrease in forest area and increase in cultivated area in each time period. Land use change led to alteration in carbon equity in soil due to change or loss in vegetation. Overall, we can conclude that the internal trading of land use area during the 10-year period (1993–2003) led to net loss of SOC stock by 8.29 Mt C. Similarly, land use change during 11-year period (2003–2014) caused net loss of SOC by 2.76 Mt C. Efforts should be made to implement proper land use management practices to enhance the SOC content.
Highlights
Land use change plays a vital role in global carbon dynamics
The result showed that the total area under agricultural lands was increased by 32.14% while that under forest was decreased by 23.14% during the time period of 1993-2014 (Table 4)
Effect of major land use change dynamics on Soil organic carbon (SOC) stock in 1993–2003 is shown in Figs. 7a and 8a, and it shows that changes among agricultural land leads to maximum loss of soil carbon, i.e., 4.88 Mt C
Summary
Land use change plays a vital role in global carbon dynamics. Understanding land use change impact on soil carbon stock is crucial for implementing land use management to increase carbon stock and reducing carbon emission. The objective of our study was to determine land use change and to assess its effect on soil carbon stock in semi-arid part of Rajasthan, India. Land use change from forest to agricultural land (deforestation) is supposed to be one of the anthropogenic activities culprit for increased atmospheric level of carbon dioxide (Shrestha et al 2004; Houghton and Hackler 1999; Lal 2004a). The rate of emission of carbon from change in land use has been gradually rising over the last 150 years (1850– 2000), which reached to about 2 Pg C per year (Houghton and Hackler, 2002). The net emissions of carbon dioxide in the last 150 years (1850–2000) due to land use change is about 156 Pg C (Houghton 2003). The CO2 emission from land use change was estimated to be 1.7 Pg C year−1 in 1980–1989, 1.6 Pg C year−1 in 1989–1998 (IPCC 2000), and 1.1 Pg C year−1 in 2000–2009 (Friedlingstein et al 2010)
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