Perubahan kondisi biofisik-kimia lahan akibat pembangunan kanal pada areal IUPHHBK-HA (Sagu) PT. Austindo Nusantara Jaya Agri Papua di Kabupaten Sorong Selatan

The constructions of canals for water use and management as well as supporting activities of productions, transportation and firebreaks lines are expected to have an impact on the biophysical and chemical changes in construction land. Therefore, the aims of this research are to know the amount of vegetation lost due to land clearing for canal constructions, land biophysical-chemical conditions changed as a result of canal clearing, aboveground carbon dioxide estimation and soil carbon stock estimation. Primary data collection determined by purposive on canal line for stand structure and composition, along with soil carbon estimation. The results showed that the opening of canal area of 82,35 ha will result in the loss of 19.866 sago trees on 40 cm average in diameter and 3.642 mature trees. Thus, sago starch on 82,35 ha will lost as much as 637,27 tons or 637.265,48 kg. Changes in land biophysical-chemical due to canal constructions are habitat fragmentation, increase in soil erosion, land slide of canal wall, changes in water quality particularly solid suspension total as a direct impact to increased turbidity, sedimentation, and siltation of canals. Furthermore, the impact of 82,35 ha canal construction was increasing of carbon dioxide (CO2) emission as much as 38.716,48 ton, and it is estimated that it will increase in line with future canal construction. Based on soil bulk density ranging from 0,58 to 1.22 g/cm3 and Carbon-organic content ranging from 16.65 to 54,16 %, it is estimated that carbon stock on 0 to 30 cm soil layer on 1 Ha area will be lost as 109 ton.

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Modeling relevant factors and covariates of carbon stock changes in peatlands using a hierarchical linear mixed modeling approach

10.5194/egusphere-egu2020-10948 ◽

2020 ◽

Author(s):

Kilian Walz ◽

Kenneth A Byrne ◽

David Wilson ◽

Florence Renou-Wilson

Keyword(s):

Soil Carbon ◽

Environmental Protection Agency ◽

Land Surface ◽

Carbon Stock ◽

Dimensional Space ◽

Carbon Stocks ◽

Carbon Distribution ◽

Soil Carbon Stock ◽

Modeling Approach ◽

The Impact

<p>While peatlands constitute the largest soil carbon stock in Ireland with 75% of soil carbon stored in an area covering an estimated 20% of the land surface, carbon stocks of peatlands are affected by past and present disturbances related to various land uses. Afforestation, grazing and peat extraction for energy and horticultural use often are major drivers of peatland soil degradation. A comparative assessment of the impact of land disturbance on peatland soil carbon stocks on a national scale has been lacking so far. Current research, funded by the Irish Environmental Protection Agency (EPA), addresses this issue with the goal to fill various gaps related to mapping and modeling changes of soil carbon stock in Irish peatlands. Data from the first nationwide peatland survey forms the basis for this study, in which the influence of different factors and covariates on soil carbon distribution in peatlands is examined. After data exploratory analysis, a mixed linear modeling approach is tested for its suitability to explain peatland soil carbon distribution within the Republic of Ireland. Parameters are identified which are responsible for changes across the country. In addition, model performance to map peat soil carbon stock within a three-dimensional space is evaluated.</p>

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Changes in soil carbon stock in Mewat and Dhar under cereal and legume based cropping systems

Indian Journal of Agricultural Research ◽

10.18805/a-5137 ◽

2019 ◽

Author(s):

B. Chakrabarti ◽

S.K. Bandyopadhyay ◽

D. Pratap ◽

H. Pathak ◽

R. Mittal ◽

...

Keyword(s):

Soil Carbon ◽

Carbon Stock ◽

Management Practices ◽

Surface Soil ◽

Cropping Systems ◽

Soil Layer ◽

Cropping System ◽

Soil Carbon Stock ◽

Cropping Sequence ◽

Surface Soil Layer

Soil organic carbon is strongly affected by agricultural management practices. Cropping systems can influence the amount of carbon present in soil. Increase in SOC can be related with the choice of crops present in the cropping sequence as well as on the management practices followed. The present study was undertaken to quantify the changes in soil carbon stock under different cropping systems. Two major cropping systems i.e. pearlmillet-wheat and pearlmillet-mustard were selected in Mewat, Haryana while soybean-wheat cropping systems was identified in Dhar, Madhya Pradesh. Results showed that SOC of surface soil layer decreased from 0.42% to 0.39% in pearlmillet-mustard cropping system during the study period. But in soybean-wheat cropping system it increased from 1.14% to 1.24%. Legume based cropping system showed enhancement of surface soil carbon.

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