doi:

DOI: 10.3724/SP.J.1227.2012.00420

Journal of Arid Land 2012/4:4 PP.420-430

Changes in soil carbon stocks and related soil proper-ties along a 50-year grassland-to-cropland conversion chronosequence in an agro-pastoral ecotone of Inner Mongolia, China


Abstract:
Land use change significantly influences soil properties. There is little information available on the long-term effects of post-reclamation from grassland to cropland on soil properties. We compared soil carbon (C) and nitrogen (N) storage and related soil properties in a 50-year cultivation chronosequence of grassland in the agro-pastoral ecotone of Inner Mongolia. Field surveys on land use changes during the period of 1955–2002 were conducted to build a chronosequence of cropland of different ages since the conversion from grassland. The results showed that soil C and N storage, soil texture, and soil nutrient contents varied with land use types and cropland ages (P<0.01). In the 0–30 cm soil layer, the soil organic carbon (SOC) density was significantly lower in the croplands (3.28 kg C/m2 for C50 soil) than in the grasslands (6.32 kg C/m2). After 5, 10, 15, 20, 35, and 50 years of crop planting (years since the onset of cultivation), the SOC losses were 17%, 12%, 19%, 47%, 46%, and 48%, respectively, compared with the grasslands. The soil total nitrogen (TN) density of the grass-lands was 65 g N/m2, and TN density of the cropland soil was 35 g N/m2 after 50 years of crop planting. Both the SOC and TN densities could be quantitatively determined by a negative exponential function of cropland age (P<0.0001, R2=0.8528; P<0.0001, R2=0.9637). The dissolved organic carbon (DOC) content, soil available potassium (AK) content, clay content, and pH value were decreased; and the soil bulk density and sand content were increased since the conversion of grassland into cropland during the 50-year period. Our results show soil nutrients were higher in grassland than in cropland. The conversion of grasslands to croplands induced a loss of soil C storage and changes of related soil properties. The reclamation time of cultivated soil (cropland age) had significant effects on soil properties in the study area.

Key words:land use type,cropland age,grassland,soil physical-chemical properties,agro-pastoral ecotone

ReleaseDate:2014-07-21 16:23:21



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