Impact Of Land Use On Organic Carbon Storage In The Peatland Of East Jilin

This dissertation focuses on the peatland in the eastern part of JiLin province. Accordingto the literatures, topographic maps and field investigation, this paper determines thepeatland's distributing boundary, then carries on an investigation in the land use types ofpeatland by remote sensing interpretation of the landsat ETM+ images acquired in 2001.Based on the investigation in exploitation of peatland, this paper analyses the land usecharacteristics of peatland. Based on previous researches, the paper estimates the organiccarbon storage of the peatland before disturbance , the organic carbon loss of different landuse types after land use changed,the organic carbon loss after exploitation and the organiccarbon storage of peatland after land use changed. At last, this paper analyses the impacts ofland use change on the organic carbon storage of peatland. The conclusions are as follows: (1) The features of distribution of peatland: Eutrophy peat mire is widespread, themesotrophy and oligotrophy peat mire distribute sporadically;Peat mire is more in basin andrelatively rare in lava plateau and hilly-gully;The southern peatlands are older than that in thenorthern.(2) The reserves of peat is about 0.63 hundred million ton, organic carbon storage is0.1905 hundred million ton. Spatially, the organic carbon storage is decreased form lavaplateau area and basin area to hilly-gully area, from south to north it decreased gradually.Temporally, the organic carbon storage was the maximum in the late Holocene, fewer in themiddle Holocene, and the minimum in the early Holocene. Embodies the characteristics: Thenew peatland is more than the older.(3) The land use of the peatland in the eastern part of Jilin Province is categorized intouncultivated peatland, paddy, upland and forestland. There are 77.43% peatlands(approximately 13785.48 hm2) were reclaimed. The majority type of land use was upland,followed by paddy, uncultivated peatland and forestland. The total peat exploited was 557300ton. (4) There are two major types of impacts of land use on the peatland's organic carbonstorage: changing the land use patterns and peatland exploiting. The current organic carbonstorage of the peatland in the eastern part of Jilin Province is about 0.1691 hundred millionton (88.7% of the organic carbon storage before disturbance), the organic carbon loss is about2144200 ton. The organic carbon loss is the most serious after peatland have been reclaimedto upland(about 1232900 ton,6.5% of the organic carbon storage before disturbance), thesecond is the organic carbon loss after peatland have been reclaimed to paddy(about 754500ton, 4.0% of the organic carbon storage before disturbance), the third is the organic carbonloss after peatland exploitation(about 174100 ton, 0.9% of the organic carbon storage beforedisturbance), The organic carbon loss is the lightest after peatland have been reclaimed toforestland(about 64400 ton, 0.3% of the organic carbon storage before disturbance)...