Cultivated Land Information Extraction and Gradient Analysis for a North-South Transect in Northeast Asia between 2000 and 2010

Abstract

Cultivated land resources are an important basis of regional sustainability; thus, it is important to determine the distribution of the cultivated land in the Northeast Asia trans-boundary area of China, Russia and Mongolia, which has a continuous geographic and ecological environment and an uneven population distribution. Extracting information about the cultivated land and determining the spatial and temporal distribution of its features in this large trans-boundary area is a challenge. In this study, we derived information about the cultivated land of the North-South indicate the presence of a greater amount of cultivated land in the south and less in the north. China owns most of the cultivated land in the transect area, followed by Mongolia and then Russia. A gradient analysis revealed a decrease of 34.16% of the cultivated land between 2000 and 2010. The amount of cultivated land decreased 22.37%, 58.93%, and 64.73% in China, Russia, and Mongolia, respectively. An analysis shows that the amount of cultivated land is primarily influenced by the various land development and protection policies in the different counties in this trans-boundary area.

A comparative study of 17 phenological models to predict the start of the growing season

“…The NSTNEA covers regions with coordinates ranging from 32 to 78 • N and from 105 to 118 • E, spanning China, Mongolia, and Russia. The center of the NSTNEA is located at Lake Baikal in Southern Siberia, Russia, and the south and north are bounded by the northern bank of the Yellow River in China and the shore of the Arctic Ocean, respectively (Wang et al, 2014).…”

Land Cover Change Characteristics of North-South Transect in Northeast Asia from 2001 to 2012

“…Jiang et al(2014) analyzed the land cover change in the transboundary area of China, Mongolia, and Russia. Wang et al(2014) qualitatively analyzed the arable gradient distribution and described the changes occurring between 2000 and 2010. Li etal.…”

“…(2008) studied the changes of Russian land use systems and their land market institutions. Zhou (2012) revealed land use changes in the Mongolia Plateau that occurred during the last30 years to show that grassland degradation and desertification became the significant spatial and temporal characteristics of land use change in Mongolian Plateau that and the conditions in Inner Mongolia are more severe than those in Mongolia． A transect can be used as a bridge to connect the study of separate sites and complex spatial analysis at the regional scale and as a coupling medium between time and spatial scales (Zhang et al 1995).Moreover, transects provide a network for improving the understanding of controls over vegetation dynamics, carbon dynamics, and water and en-ergy exchange at high latitudes (McGuire et al 2002).The North-South Transect of Northeast Asia(NSTNEA)was proposed by scientists of China, Russia, and Mongolia after they initiated a comprehensive scientific survey in northern China and the adjacent areas in 2008 (Wang et al 2011;Wang et al 2014).This paper examines the land cover change characteristics relative to the NSTNEA occurring from 2001 to 2012.…”