A Study on the Wetland Dynamic and Its Relation with Cropland Reclamation in Sanjiang Plain, China

K Song, D.W. Liu, Z.M. Wang, Shahbaz Khan, Muhammad Hafeez, Jianxin Mu

Research output: Book chapter/Published conference paperConference paperpeer-review

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Abstract

EXTENDED ABSTRACT Sanjiang Plain, located in the northeast of Heilongjiang province, is the largest concentrated area of the freshwater wetlands in China(Figure.1). It was mainly primeval landscape before the 1950s. From the late 1950s to the early 1990s, a number of large farms were built concomitant with the loss of wetlands. Now, it is one of the main food and agricultural bases of the nation. Due to large-scale agricultural development, nearly 80% of the freshwater wetlands have been reclaimed during the past decades.This study analysed the dynamics of the wetland and its conversion to other land uses in Sanjiang Plain from 1976 to 2005 with remote sensing imagery data and GIS spatial analysis (figure.2). It shows that the wetland in Sanjiang Plain has been severely damaged. The wetland area decreased by37.72% from 1976 to 1986, by 15.54% from 1986 to 1995, and by 30.97% from 1995 to 2005, which shows that the situation of wetland loss had much slowed down in 1986 to 1995, but in recent years,especially after rural Fee-Tax-Free policies adopted, which again speed up the reclamation rate of wetland. The result indicated that most wetland losing was due to reclamation, and only small part of lost wetland was converted into grassland and forest. Land use conversion is a complex process;there also some other types of land use converted to wetland during this study period, our study research showed that cropland contributed the main part for the increase in wetland area where aimless reclaimed cropland was converted into wetland during flood inundation. Both demographic and resource management policies reason were analysed for the wetland reduction.The result showed that population increasing was the main reason for wetland reduction in the past decades since 1950s, the lost wetland was mainly converted to dry farming land and paddy field, and the trend of wetland conversion to paddy field increased for the sake of its high agricultural output.Though the reclamation speed of wetland decreased during the later periods, wet land reclamation still happened, so strict and practicable protection measurement of the wetland in Sanjiang Plain should be reinforced further.Figure.1 Location of the Sanjiang Plain in China,DEM, main rivers and lakes in Sanjiang Plain Xinkai Honghe Sanjiang 10390 Province boundary Sanjiang Plain Beijing Heilong Figure.2 Wetland distribution changing trend in Sanjiang Plain in four different stages 2569
Original languageEnglish
Title of host publicationLand, Water & Environmental Management
Subtitle of host publicationIntegrated Systems for Sustainability
EditorsLes Oxley, Don Kulasiri
Place of PublicationChristchurch, New Zealand
PublisherUC Print
Pages2569-2575
Number of pages7
ISBN (Electronic)9780975840047
Publication statusPublished - 2007
EventInternational Congress on Modelling and Simulation (MODSIM) - Christchurch, New Zealand
Duration: 10 Dec 200713 Dec 2007

Conference

ConferenceInternational Congress on Modelling and Simulation (MODSIM)
Country/TerritoryNew Zealand
CityChristchurch
Period10/12/0713/12/07

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