Journal of Geographical Sciences ›› 2019, Vol. 29 ›› Issue (2): 180-196.doi: 10.1007/s11442-019-1591-4
• Research Articles • Previous Articles Next Articles
Xiaoyu GAO1,2(), Weiming CHENG1,2,3(
), Nan WANG1,2, Qiangyi LIU1,2, Ting MA1, Yinjun CHEN4, Chenghu ZHOU1
Received:
2018-09-06
Accepted:
2018-11-07
Online:
2019-02-25
Published:
2019-03-20
About author:
Author: Gao Xiaoyu (1994-), Master, specialized in cropland use and agricultural resources management. E-mail:
Supported by:
Xiaoyu GAO, Weiming CHENG, Nan WANG, Qiangyi LIU, Ting MA, Yinjun CHEN, Chenghu ZHOU. Spatio-temporal distribution and transformation of cropland in geomorphologic regions of China during 1990-2015[J].Journal of Geographical Sciences, 2019, 29(2): 180-196.
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Table 1
Dynamic degree of cropland (DDC) in different geomorphologic regions"
Region I | Region II | Region III | ||||
---|---|---|---|---|---|---|
Change ranges (ha) | DDC (%) | Change ranges (ha) | DDC (%) | Change ranges (ha) | DDC (%) | |
1990-1995 | 5,125,436 | 1.40 | 940,063 | 0.56 | 1,733,440 | 1.29 |
1995-2000 | 1,981,791 | 0.53 | 692,366 | 0.42 | 840,587 | 0.62 |
2000-2005 | 1,345,601 | 0.36 | 671,039 | 0.40 | 815,059 | 0.59 |
2005-2010 | 797,084 | 0.21 | 246,073 | 0.15 | 196,102 | 0.14 |
2010-2015 | 914,676 | 0.24 | 427,295 | 0.26 | 325,892 | 0.24 |
Region IV | Region V | Region VI | ||||
Change ranges (ha) | DDC (%) | Change ranges (ha) | DDC (%) | Change ranges (ha) | DDC (%) | |
1990-1995 | 1,380,978 | 4.06 | 423,537 | 0.25 | 64,006 | 0.61 |
1995-2000 | 720,985 | 2.15 | 215,656 | 0.13 | 54,301 | 0.51 |
2000-2005 | 930,895 | 2.62 | 373,304 | 0.22 | 41,949 | 0.39 |
2005-2010 | 335,846 | 0.85 | 276,716 | 0.16 | 18,363 | 0.17 |
2010-2015 | 1,065,573 | 2.61 | 324,831 | 0.19 | 17,915 | 0.17 |
Table 2
Temporal and spatial change characteristics of cropland in different geomorphologic regions"
Geomorphological regions | Changes in cropland area (104 ha/a) | Characteristics of newly reclaimed cropland | Characteristics of lost cropland |
---|---|---|---|
Region I (Eastern hilly plains) | +5.40 | It was mainly converted from grassland and unused land, concentrating on Songnen Plain, Liaohe Plain, and Sanjiang Plain | It was mainly reclaimed to built-up land, and occurred in the vicinity of northeastern provincial capital cities and eastern coastal areas (especially Yangtze River Delta). The proportion of converting built-up land to cropland continued to increase. |
Region II (Southeastern low middle mountains) | -5.92 | The increased reclaimed cropland occurred mainly during 1990-2000. And it concentrated on southern Guangxi by the conversion of woodland, Dongting Lake and Poyang Lake by the conversion of water body. | Its area was far more than the reclaimed cropland. Most of the decreased cropland was changed to woodland (low-middle mountains, hills and valleys of Zhejiang and Fujian provinces) and built-up land (the Pearl River Delta and southeastern coastal areas) during 1990-2000. |
Region III (Northern China and Inner Mongolia eastern-central mountains and plateaus) | -0.15 | It mainly occurred in 1990-2005, with grassland reclamation in domination. It was primarily distributed in upland plains of northeastern Inner Mongolia, Hetao Plain and western Loess Plateau. And the proportion of grassland to reclaimed cropland was gradually reducing. | Most serious loss occurred in 1990-2005, with the conversion from cropland to grassland, especially in 1990-1995. The effect of returning farmland to forests and pastures was significant in the central part of the Hetao Plain and at bend of the Yellow River. |
Region IV (Northwestern middle and high mountains, basins and plateaus) | +8.93 | The reclaimed cropland mostly came from the conversion of grassland, scattering on oasis areas with better conditions of water and land resources, including northern Tarim Basin (Aksu and Korla), Junggar Basin and so on. | The cropland loss was not apparent in Region IV with most serious loss occurring in 1990-1995, and 67.2% of them converted to grassland. This happened mainly on the fringes of cropland or peripheries of cities and towns because of serious cropland abandonment. |
Region V (Southwestern middle and low mountains, plateaus and basins) | -2.83 | The change of cropland was much smaller than regions I and IV. The reclaimed cropland emerged in 1990-2000, by the conversion from woodland and grassland (above 88.2%). There were plenty of forests and shrub lands to be re-cultivated in hills, mountains valleys of Hubei, Guizhou, and Yunnan provinces. | With the accelerated industrialization and urbanization, a great deal of cropland was exploited to built-up land, and the proportion of cropland converted to built-up land was gradually increasing. |
Region VI (Tibetan Plateau) | +0.06 | Almost unchanged. | Almost unchanged. |
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