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Study on Soil Organic Carbon(SOC) Pool under Different Vegetation Types

Author: DingYueKui
Tutor: Yang
School: Inner Mongolia University
Course: Ecology
Keywords: Mu Us Sandland Vegetation types Soil organic carbon
CLC: S153.6
Type: Master's thesis
Year: 2011
Downloads: 134
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Abstract


Closely related to soil organic carbon and global climate change. Mu Us Sandland, one of the key areas of desertification, over the years, the ongoing local vegetation construction and recovery, combined with the development of the natural vegetation, vegetation pattern formation; clarify the changes and development of the vegetation, soil carbon sequestration measured in late August to early September 2009, the Mu Us Sandland vegetation types, including mobile sandy, semi-fixed sand oil Artemisia community, fixed Saudi oil Artemisia community, Salix communities, the middle microphylla children community, Salix matsudana the community, the the the Splendens community, the of Iris lactea communities and corn soil organic carbon (SOC) content, active organic carbon content (SAOC), total nitrogen and other soil properties (soil bulk density, moisture content, pH, mechanical), and vegetation survey and collect nearly 15 years of vegetation area change data. The results show that: (1) soil organic carbon content and density of the Mu Us Sandland different vegetation types ,0-80cm soil layer order of the size of the average content of soil organic carbon are: Iris lactea the community (22.33g/kg) of gt; gt of the the the Splendens community (9.05g/kg); gt the S. matsudana communities (6.72g/kg); gt of the the fixed Saudi oil Artemisia community (4.31g/kg); gt of the the Salix community (3.20g/kg); semi-fixed sand oil Artemisia communities (2.54g/kg) gt; farmland (1.76g/kg) gt; the middle golden pheasant the the child community (1.58g/kg) gt,; the current Saudi (1.24g/kg); 0-80cm layer of soil organic The size of the order of the carbon density are: Iris lactea the community (8.06kg/m2) gt; gt of the the Salix community (2.64kg/m2); the Splendens community (1.97kg/m2) gt; gt of the S. matsudana community (1.34kg/m2); fixed Saudi oil Artemisia communities (1.48kg/m2) gt; semi-fixed sand oil Artemisia the community (1.34kg/m2) is gt; C. intermedia the the child community (0.76kg/m2) the. gt; farmlands (0.67kg/m2) gt; mobile sandy land (0.63kg/m2). With soil depth, fixed Saudi oil Artemisia communities, S. matsudana community, Splendens community, of Iris lactea community and farmland organic carbon content have a significant accumulation of. Flow of sand, semi-fixed sand oil Artemisia communities, middle microphylla children community, Salix communities in soil organic carbon content with depth gradually decreased. Similar vertical distribution pattern of each vegetation type soil organic carbon density and organic carbon content in the soil profile. Several dune vegetation, oil Artemisia communities and Salix communities better carbon sequestration. (2) The Mu Us Sandland 0-80cm layer of soil organic carbon reserves of 411.15 × 105t, organic carbon density 3.55kg/m2. Soil organic carbon storage of different vegetation types: fixed Saudi oil Artemisia communities (164.48 × 105t) gt; wetlands in (86.04 x 105t) gt; flow of the sand (58.70 × 105t) gt; intermediate of golden pheasant children community (28.61 × 105t) gt; semi-fixed sand oil Artemisia community (26.74 × 105t) gt; farmland (25.77 × 105t) gt; the Salix community in (14.82 x 105t) gt; the S. matsudana community (5.99 × 105t). From 1988 to 2002, the flow of the sand, semi-fixed sand oil Artemisia communities and wetlands in the area is reduced, soil organic carbon reserves were accordingly reduced by 22.41%, 25.31% and 9.15%, respectively. Increase the area of ??other vegetation types, soil organic carbon reserves, which, S. matsudana communities of soil organic carbon reserves increased ratio of 130.38%, oil Artemisia communities of fixed sandy soil organic carbon reserves the largest increase is 37.09 × 105t. From 1988 to 2002, the increase in soil organic carbon storage in Mu Us Sandland 22.61 × 105t, a growth rate of 5.82%. (3) different vegetation type on soil organic carbon content had a significant effect. Mu Us Sandland as a whole in terms of the soil sticky silt content and soil water content is the main influencing factors of soil organic carbon and the former greater impact on soil organic carbon. Three regression model: Y = 35.209X1 0.621X2-2.540 (X1 soil moisture, X2 sticky silt soil, R = 0.950 **). When the soil sticky silt content and soil water content alone, respectively, of the soil organic carbon content significantly. In addition, soil carbon and nitrogen than there are some positive correlation between soil organic carbon content. Aboveground biomass and litter also has some impact on the amount of soil organic carbon. (4) different vegetation types 0-80cm soil active organic carbon content: the Iris lactea community (7.19g/kg) gt; the Splendens community (2.19g/kg) gt; the S. matsudana community (1.78g/kg) gt; fixed Saudi oil Artemisia community (1.49g/kg) gt; gt of the the Salix community (1.10g/kg); semi-fixed Saudi oil Artemisia the community (0.81g/kg) gt; farmland (0.40g/kg) gt; intermediate of golden pheasant children community (0.38g/kg) gt; mobile sandy land (0.21g/kg). 0-80cm soil active organic carbon density: Iris lactea communities (8.84kg/m2) gt; of A. splendens community (2.90kg/m2) gt; S. matsudana community (2.16kg/m2) gt; fixed Saudi oil Artemisia community ( 1.80kg/m2) gt; Salix communities (1.37kg/m2) gt; semi-fixed sand oil Artemisia the community (1.00kg/m2) is gt; farmland (0.51kg/m2) gt; middle of golden pheasant child community (0.47kg / m2) gt; the flow Saudi (0.27kg/m2). Different vegetation types of active soil organic carbon / organic carbon ratio: fixed Saudi oil Artemisia community (36.78%) gt; of Iris lactea communities (36.62%) gt; the S. matsudana community (34.93%) gt; the Salix community (32.35%) gt; semi-fixed sand oil Artemisia community (32.26%) gt; the Splendens community (29.31%) gt; farmland (24.30%) gt; the middle of golden pheasant child community (24.25%) gt; mobile sandy land (17.45%). Mu Us Sandland of active soil organic carbon reserves of 114.53 × 105t, accounting for 28.06% of the total organic carbon storage. Different vegetation types of active soil organic carbon reserves: the fixed sandy Oil Artemisia community (56.65 × 105t) gt; humidity (20.46 × 105t) gt; mobile sandy land (10.13 × 105t) gt; semi-fixed Saudi oil Artemisia community ( 8.49 × 105t) gt; the middle of golden pheasant children community (6.94 × 105t) gt; farmland (5.17 × 105t) gt; the Salix community in (5.09 x 105t) gt; the S. matsudana community (1.60 × 105t). (5) different vegetation type 0-80cm soil layer total nitrogen: Iris lactea communities (3.631g/kg) gt; the S. matsudana community (1.218g/kg) gt; fixed Saudi oil Artemisia community (1.032g / kg) gt; the the Splendens community (1.026g/kg) gt; gt of the the Salix community (0.849g/kg); the half fixed Saudi oil Artemisia the community (0.628g/kg) gt; intermediate of golden pheasant children community (0.382g/kg) gt; farmland (0.366g/kg) gt; flow of the sand (0.287g/kg). Different vegetation types 0-80cm soil carbon and nitrogen than the average: Splendens communities (9.33) gt; Iris lactea communities (6.64) gt; gt of the S. matsudana communities (5.20); farmland (4.94) gt; Salix communities (4.75) gt; flow the Saudi middle of golden pheasant child community (4.21) (4.37) gt; gt; the fixed sandy Oil Artemisia community (4.09) gt; semi-fixed sand oil Artemisia community (4.05).

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil chemistry, soil physical and chemical > Soil composition
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