Inner Mongolia West Alashan Desert Soil Organic Carbon Spatial Pattern

Desert ecosystem Soil organic carbon pool studies to reveal the mechanism and process of the global carbon cycle is important. This article at2011.9-2012.9, explore the soil organic carbon content and density of the West Alashan typical desert and hyper-arid desert14kinds of plant communities were typical distribution pattern space. The main conclusions are as follows:1. Community in soil organic carbon content and density of the spatial variation is large. Organic carbon content is divided into four: one:Form. Tamarix chinensis、Form. Sympema regelii (3.62g/kg); two:Form. Kalidium foliatum、Form. Artemisia xanthochroa、Form. Brachanthemum pulvinatum (2.38g/kg); three:Form. Salsola passerina、Form. Potaniniamongolica (1.66g/kg); four:Form. Artemisia sphaerocephala、Form. Nitraria sphaerocarpa、Form. Haloxylon ammodendron、Form. Reaumuria soongorica、Form. Nitraria tangutorum、Form. Ephedra przewalskii、Form. Convolvulus tragacanthoides (1.00g/kg)。Organic carbon density is divided into five:one:Form. Tamarix chinensis (468.94g/m2); two:Form. Artemisia xanthochroa、Form. Sympema regelii、Form. Brachanthemum pulvinatum、Form. Kalidium foliatum (334.29g/m2); three Form. Salsola passerina、Form. Potaniniamongolica、Form. Artemisia sphaerocephala (198.34g/m); four:Form. Nitraria sphaerocarpa、Form. Haloxylon ammodendron、Form. Ephedra przewalskii (130.36g/m); five, Form. Nitraria tangutorum、Form. Reaumuria soongorica、Form. Convolvulus tragacanthoides (102.50g/m2)。Organic carbon content and density of greater vertical differentiation between communities, with increasing soil depth are reduced. Organic carbon density opening down and up2types of curves, and organic carbon content also includes straight.2. Organic carbon content and density within the same community of spatial differentiation is complex. Form. Haloxylon ammodendron、Form. Artemisia sphaerocephala、Form. Salsola passerina、Form. Nitraria tangutorum, there were no difference in the community. Form. Nitraria sphaerocarpa,the organic carbon content and density of typical desert is significantly larger than the hyper-arid desert. Form. Potaniniamongolica、Form. Reaumuria soongorica、Form. Ephedra przewalskii^Form. Kalidium foliatum、Form. Tamarix chinensis organic carbon content and density differences within the community significantly.3. Communities organic carbon content in the range0.81-3.84g/kg, a density range of77.44-468.94g/m2. The region’s total organic carbon storage25.05Tg C. Typical desert zonal communities’organic carbon storage16.17Tg C, order: Form. Nitraria sphaerocarpa> Form. Sympema regelii> Form. Salsola passerina> Form. Nitraria tangutorum> Form. Potaniniamongolica> Form. Artemisia sphaerocephala> Form. Convolvulus tragacanthoides。 Hyper-arid desert zonal communities organic carbon storage of5.64Tg C, order: Form. Reaumuria soongorica、Form. Nitraria sphaerocarpa> Form. Artemisia sphaerocephala> Form. Haloxylon ammodendron。Azonal of Form. Tamarix chinensis and Form. Kalidium foliatum organic carbon storage of2.62Tg C,0.62Tg C.