XXII ISPRS Congress 2012: Technical Commission VIII

Shortis, M.; Shimoda, H.; Cho, K.

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Multivolume work

Persistent identifier:: 1663813779

Title:: XXII ISPRS Congress 2012

Sub title:: Melbourne, Australia, 25 August-1 September 2012

Year of publication:: 2013

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663813779

Language:: English

Additional Notes:: Kongress-Thema: Imaging a sustainable future

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Document type:: Multivolume work

Volume

Persistent identifier:: 1663822514

Title:: Technical Commission VIII

Scope:: 590 Seiten

Year of publication:: 2014

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663822514

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(39,B8)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist ermittelt.; Literaturangaben

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: Shortis, M.; Shimoda, H.; Cho, K.

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [VIII/8: Land]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: TRAJECTORY ANALYSIS OF FOREST CHANGES IN NORTHERN AREA OF CHANGBAI MOUNTAINS, CHINA FROM LANDSAT TM IMAGE F. Huang, H. J. Zhang, P. Wang

Document type:: Multivolume work

Structure type:: Chapter

130 - 125 | 120 + past L10 + 105 | 100 - 095 : AWMPFD 1986 2000 2006 0 Closed forest (3 Shrub C) Open forest C1 Other forest C) Total Figure 3. Landscape metrics of forest 4.3 Forest Change Trajectory All found trajectories were cdassified into three classes, namely, unchanged, human-induced change and natural changes (Table 2). The unchanged class indicates that forest cover was found on the same analyzed pixel over the past 20 years. The human- induced change class includes decisive changes due to human activities such as cultivation, logging, reforestation and construction. The representative trajectories of this class include F-C-C, F-F-C, F-F-B and C-C-F. The conversion between forest and other natural cover types are defined as natural changed trajectories in the study area during 1986-2006. Examples of trajectories of this class are F-F-G, F-G-G, G-G-F and G-F-F. Level 1 classes Level 2 classes Trajectotie Am S (ha) Unchanged Stable forestland F-F-F 33942.37 Natural change Changed o F-F-G 529.18 grassland F-G-G 11.71 G-F-G 1.12 W-F-G 0.16 Changed to forestland GEF 737 W-F-F 0.72 U-U-F 2.13 U-F-F 0.41 Changed to F-W-W 0.92 water area Subtotal 553.72 Human-induced Changed to F-C-C 72.28 change cropland F-F-C 674.9 C-F-C 15 G-F-C 1.36 Changed to forestland CF 21.09 C-C-F 4.43 B-F-F 0.1 B-F-F 0.1 Changed to C-F-G 114 grassland Changed to built-up land EFH 10.00 F-B-B 0.78 F-C-B 0.34 C-F-B 0.08 Changed to F-U-U 6.56 unused land F-F-U 105.24 Subtotal 938.99 Table 2. Forest change trajectories and area statistics (km?) During the 20-year study period, the unchanged area of forest took up 78.8% of the total area. Human-induced changes in forest occupied 2.2%, while natural change area 1.3%. The rest of the total area was occupied by the changes between other land use types. For the natural change area, the trajectory of F- F-G obviously dominated, constituting 95.6%. Cropland converted from forest occupied 79.6% of total area of the human-induced change trajectories. Due to clear-cutting and selective logging, 111.8 km? forest was changed to unused land, taking up 11.9% of total human-induced changed area. About 5.3% of total human-induced changed area was lost to built-up land. Overall, the total area of human-induced change is 1.7 times than that of natural change in the study area during past 20 years. 5. DISCUSSION AND CONCLUSION Increases of population and intensive agriculture generally have been regarded as main causes of land use and land cover changes (Verburg et al. 1999). Some studies offer statistical evidence supporting the claim that population growth drives or strongly contributes to forest clearance (Allen and Barnes 1985). During past two decades, the total population of the study area increased by 12% from 1.95 million to 2.18 million. The increased population and consequent demand for grain have caused the increased reclamation of farmland in the study areas in parallel to the loss of forestland. Rapid economic development was partly responsible for land use changes in this study area. Gross domestic product (GDP) of the Yanbian prefecture increased dramatically, indicating a boost in economy and accelerated infrastructure construction. The steady population growth and economic boost coincided with a continuous increase in its developed land area. During the early years of the People’s Republic of China, in order to meet the exigent demands of economic construction and social development, the primary goal of forestry in Northeast China was that of timber production (Yu et al. 2011). Excessive harvesting of timber was encouraged for a long period (Zhou 2006). More than 20 state-owned forestry enterprises were established on the Changbai Mountains. Since 1978, forestry was to be guided by universal forest protection, extensive reforestation and afforestation efforts, a combination of cutting and planting, and sustainable utilization. However, in conjunction with national economic reforms and the broadening of international relations, excessive logging and neglected cultivation of forests which together nearly exhausted exploitable forest reserves in the region (Zhang et al 2000). The ‘food first’ agricultural policy exerted the longest influence since the People’s Republic of China founded in 1949(Gao et al. 2006). Large area of natural forest in Northeast China was cleared for farming in the past decades. There was a continuous decrease in cropland area between 1986 and 2001, which could be related to the abandonment of low quality croplands on steep terrace and rapid expansion of construction land. Since 2002, cropland area saw an upward trend partially driven by the policy of dynamic equilibrium of the total cultivated land. The policies of “Grain for Green” (reversing cultivated land to forestland and grassland), the “Natural Forest Conversion Program” (NFCP) and “Construction of an Ecological Province” projects were formally launched in the nation since 1998. Timber harvesting levels in Northeast China have decreased, but forest area and stocking levels have slowly increa protec ecolog classi protec rehabi affore the pc forest such a shrink effort: In she years. consic reduct increa analy: simpl: the p repres driver refore forest and popul that devel. degra Allen devel Geog Arms introc econc Baldi fragn Ecos) Cakir fragn Enter Chan recon Mout -317 Chan Dyna Chin Dai | Chin. probl Dai I YT. 1

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