Cultivated land resource security has been one of the most important problems in the world. In order to study the effects of urbanization on cultivated land resource security, the spatial-temporal dynamics of growth typology and land use intensity were analyzed using Landsat remotely sensed imageries of 1991, 1996, 2001 and 2006. Results indicated that: 1) In the main town urbanization phase, the urban edge-expansion growth appeared in urban center areas (S=0.41 in urban center between 1991 and 1996, S=Lc/P, where Lc is the length of the common boudary of a newly grown urban area and the pre-growth urban patches, and P is the perimeter of this newly grown area), while in the rural urbanization phase, the urban infilling growth was obvious in urban center areas (S=0.85 in urban center between 2001 and 2006). In rural areas, the urban spontaneous growth was dominant in the main town urbanization phase (S=0.15 in 16 km between 1991 and 1996), while both urban spontaneous growth and urban edge-expansion growth coexisted in rural urbanization phase (S=0.39 in 16 km between 2001 and 2006). 2) Land use intensity(I) of Zhangjiagang urbanization changed by stages. The phase from 1991 to 1996, 1996 to 2001 and 2001 to 2006, was main town urbanization (the maximum of I appeared in 4 km), slow urbanization (the value of I was low and fluctuated smoothly), and rural urbanization (the maximum of I appeared in 22 km), respectively. As the rapid development of urbanization in rural areas of Zhangjiagang, the cultivated land resources security was threatened seriously.
YANG Qi, GAN Xiao-yu, LI Jian-long, ZHANG Jie, YANG Feng, QIAN Yu-rong
. Cultivated Land Resources Security and Spatial-temporal Dynamics of Urbanization in Zhangjiagang, Jiangsu[J]. JOURNAL OF NATURAL RESOURCES, 2010
, 25(8)
: 1274
-1283
.
DOI: 10.11849/zrzyxb.2010.08.005
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