The carbon cycle greatly influences global change, and the land cover changes contribute to the status and rate of the carbon budget in ecosystems. This paper proposes a land cover classification system for land cover mapping for the estimation of carbon storage in ecosystems and the national environmental assessments. The classification system consists of basic land cover classes at level 玉 and 域, and auxiliary features at level 芋. The basic 38 classes at level 域 characterizing land cover features are derived from 19 criteria referring to aspects of composition, structure, pattern, phenology, etc. The basic classes reflect the status of carbon storage in ecosystems. The system defines more detail in vegetation, the criteria includes life form, vegetation height, leaf type, vegetation phenology, vegetation cover, soil disturbance under vegetation, harvest disturbance, spatial relationships between vegetation and artificial surfaces. Meanwhile, non-vegetation criteria is considered in nonvegetation types definition for large scale ecological monitoring and assessment, such as the water conditions, the artificial surface features, soil structure, land granular, soil salinity, soil moisture, surface state, the water flowing. The auxiliary classes at level 芋 complement the attributes of level 玉 and 域 by 9 criteria. The 5 environmental criteria of temperature, moisture, landform, aspect and slope mainly reflect the potential and intensity of carbon storage in ecosystems. The disturbance of vegetation succession caused by land use type influences the vegetation carbon budget. The other 4 criteria of vegetation cover, vegetation growing period, land use and species characteristics further refine the vegetation types, and land use typically impact the carbon storage. The structure of the land cover map of the classes of levels 玉 and 域 is independent of the products of level 芋, which is helpful for land cover product management and applications. The classification system has been adopted in the Chinese national land cover database ( ChinaCover2010) for http: / / www.ecologica.cn the carbon budget in ecosystems at a 30 m scale. The classification system is characterized by the factors of intrinsic attributes and extrinsic property of land cover. It is able to effectively reflect the status of ecosystem carbon stocks, rate of change, the potential and mechanism. Classification system uses a flexible definition of vegetation cover, and it is able to re -organize vegetation classes by different vegetation coverage, this approach allows analysis and comparison on different classification system among countries or organizations. Class definition is performed by using FAO LCCS tools through dichotomy which is defined in quantified approach of land cover. LCCS method provides relatively accurate and comprehensive type definition, a priori design to make it much fair, balanced, but also makes the system extensive application. With the increasing attention to global environmental issues, land cover data used in the international ex...
ecosystem classification system based on remote sensor information in China.Acta
Time鄄series remote sensing data can provide vegetation information in different stages in one growing period, which is very helpful for the understanding of the dynamic of land cover. As the basic data source of ChinaCover, the multi鄄 spectral CCD images of HJ constellation have the same 30m spatial resolution and visible to near infrared band as other earth resource satellite. It can provide 2 days temporal resolution for there are two satellites named HJ鄄 1A and HJ鄄 1B with 180 degree phase differences and each satellite has 4 days temporal resolution. It is an important data source for the ecological land cover classification and eco鄄parameter inversion. However, incorrect geolocation caused by the satellite motion along the roll, pitch, yaw direction and the pixel displacement caused by the topographical variations at the off鄄nadir viewing angle are the bottlenecks when using the massive amount of HJ data. High precision space coordinates is the basic information to guarantee the information extraction, geostatistics analysis and to combine images with other geographic information. The geo鄄registration and orthorectification is the first issue facing in the pre鄄processing procedure for the remote
收稿日期:2015• 11• 10; 修订日期:2016• 04• 25 * 通讯作 者 Corresponding author.E•mail: zengyuan@ radi.ac.cn DOI: 10.5846 / stxb201511102277 郑朝菊,曾源,赵玉金,高文文,赵旦,吴炳方.20 世纪 90 年代以来中国西南地区土地覆被变化.生态学报,2016,36(23) :7858• 7869. Zheng Z J, Zeng Y, Zhao Y J, Gao W W, Zhao D, Wu B F.Analysis of land cover changes in southwestern China since the 1990s.Acta Ecologica Sinica, 2016,36(23) :7858• 7869.
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