JOURNAL OF NATURAL RESOURCES ›› 2019, Vol. 34 ›› Issue (5): 975-988.doi: 10.31497/zrzyxb.20190506

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TUPU characteristics of spatiotemporal variation for land use in the Yihe River Basin

Yuan-he YU1(), Zi-jun LI1(), Jin-kuo LIN2, Jin-yu LIU1, Shuo WANG1   

  1. 1. College of Geography and Environment, Shandong Normal University, Jinan 250014, China
    2. College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
  • Received:2018-10-27 Revised:2019-02-17 Online:2019-05-28 Published:2019-05-28

Abstract:

Research on the land use change in the Yihe River Basin is of great significance to the comprehensive management of regional ecological environment, rational exploitation of land resources and conservation of soil and water. Based on spatial data of land use covering three periods (1995, 2005, 2015) in the Yihe River Basin, this paper used geo-information TUPU methods to build transition TUPU and fluctuation TUPU of land use at two stages (1995-2005, 2005-2015) supported by 3S technology. Then the spatial-temporal change characteristics, laws and development process of land use in recent 20 years in the study area are discussed. The results showed that: (1) From 1995 to 2015, the land use structure in the Yihe River Basin was dominated by cultivated land and forest land, among which the decrease in cultivated land and grassland and the increase in forest land and construction land were the main change trends. (2) The transition TUPU of land use was dominated by the conversion of cultivated land, forest land and grassland, and the occupation of cultivated land by construction land. The conversion of forest land and grassland to cultivated land mainly occurred in the plains of the central part of Feixian county and Pingyi county. The conversion of cultivated land to forest land and grassland was mainly found in the mountainous areas where soil erosion was more serious in the north and southwest of the study area. The conversion of cultivated land to construction land was mainly concentrated in the regions with relatively developed economy around the urban areas of counties and cities. Between the two stages, there were significant differences in the types and areas of the main TUPU units that have changed. The space of land use conversion between 2005 and 2015 was further expanded. (3) In the rising TUPU of land use, the area of newly added cultivated land was the largest, accounting for 33.87% of the newly added area. Moreover, in the falling TUPU of land use, the area of decreased cultivated land was the largest, accounting for 51.38% of shrinking area. In the two sequential elements, there were significant differences in the changes in the rising TUPU and falling TUPU of each county. This study can provide a scientific basis for the sustainable utilization of land resources and ecological construction in the Yihe River Basin.

Key words: land use change, geographic information TUPU, TUPU unit, Yihe River Basin