Spatio-temporal distribution and transformation of cropland in geomorphologic regions of China during 1990–2015

The Zoige Plateau is typical of alpine wetland ecosystems worldwide, which play a key role in regulating global climate and ecological balance. Due to the influence of global climate change and intense human activities, the stability and sustainability of the ecosystems associated with the alpine marsh wetlands are facing enormous threats. It is important to establish a precise risk assessment method to evaluate the risks to alpine wetlands ecosystems, and then to understand the influencing factors of ecological risk. However, the multi-index evaluation method of ecological risk in the Zoige region is overly focused on marsh wetlands, and the smallest units of assessment are relatively large. Although recently developed landscape ecological risk assessment (ERA) methods can address the above limitations, the final directionality of the evaluation results is not clear. In this work, we used the landscape ERA method based on land use and land cover changes (LUCC) to evaluate the ecological risks to an alpine wetland ecosystem from a spatial pixel scale (5 km × 5 km). Furthermore, the boosted regression tree (BRT) model was adopted to quantitatively analyze the impact factors of ecological risk. The results show the following: (1) From 1990 to 2016, the land use and land cover (LULC) types in the study area changed markedly. In particular, the deep marshes and aeolian sediments, and whereas construction land areas changed dramatically, the alpine grassland changed relatively slowly. (2) The ecological risk in the study area increased and was dominated by regions with higher and moderate risk levels. Meanwhile, these areas showed notable spatio-temporal changes, significant spatial correlation, and a high degree of spatial aggregation. (3) The topographic distribution, climate changes and human activities influenced the stability of the study area. Elevation (23.4%) was the most important factor for ecological risk, followed by temperature (16.2%). Precipitation and GDP were also seen to be adverse factors affecting ecological risk, at levels of 13.0% and 12.1%, respectively. The aim of this study was to provide more precise and specific support for defining conservation objectives, and ecological management in alpine wetland ecosystems.

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“…was used to calculate and analyze the LULC dynamic degrees in the study area from 1990 to 2016 [48]. The formula is as follows:…”

Section: Classification and Accuracy Assessment Methodsmentioning

confidence: 99%

Ecological Risk Assessment and Impact Factor Analysis of Alpine Wetland Ecosystem Based on LUCC and Boosted Regression Tree on the Zoige Plateau, China

Hou

Gao

et al. 2020

Remote Sensing

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“…Spatial distribution characteristics of cultivated land in mountainous areas are directly related to topographic factors. Topography restricts the form and effectiveness of cultivated land use through the distribution of surface water and heat, which plays a vital role in determining cultivated land quality (Gao et al, 2019). Accordingly, the relief amplitude model is used to analyse the spatial distribution characteristics of cultivated land evolution in Southwest China.…”

Section: Topographic Relief Amplitude Extractionmentioning

confidence: 99%

“…Cultivated land is one of the most sensitive types of land‐use change (Gao et al, 2019), covering about 12.6% of global surface area (Han & Song, 2019). It plays a vital role in regulating climate change and ensuring food security and sustainable human development (Bren d'Amour et al, Fprogramme 2017; Rudel et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Exploring cultivated land evolution in mountainous areas of Southwest China, an empirical study of developments since the 1980s

et al. 2020

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Cultivated land protection is related to food security and sustainable development. As an important reserve resource, the protection and development of cultivated land in mountainous areas need attention from governments and academia. This paper analyses the long‐term evolution process cultivated land in mountainous areas of Southwest China by using large‐scale remote sensing, topographic relief amplitude model, and a modified binary logistic regression model, to understand internal reasons for evolution differentiation at the macro level. The results show that untransformed cultivated land is mainly distributed below the topographic relief amplitude of 770 m. The transformation direction and spatial characteristics of transformed cultivated land gradually shift to low relief amplitude (<631 m) areas with time. Construction land accounts for 51.11% of the cultivated land transformation, usually distributed in flatlands or basins below the relief amplitude of 498 m, and hilly cultivated land around it displays a fluctuating recovery process. Topography is the most important factor affecting the evolution of cultivated land in mountainous areas. However, there are still differences in the driving mechanism of cultivated land evolution types, and some key policies in China in the past directly affected the evolution paths of cultivated land in mountainous areas. The research results can provide ideas for the utilization and protection of cultivated land in similar mountainous areas.

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“…Landforms affect the allocation of surface water, heat, soil, and organisms to a significant extent, and thus may have great influence on the type of land use and the structure of farmland. Cheng et al (2018b) and Gao et al (2019) analyzed farmland conversion during 1990-2015 in the first-order geomor-regions. Studies indicated that the loss of farmland occurred mostly in Regions II and V as a result of growing industrialization and urbanization, whereas the increase of farmland occurred mainly in Regions I and IV because of reclamation of grassland and wasteland.…”

Section: Farmland Conversionmentioning

confidence: 99%

Geomorphological regionalization theory system and division methodology of China

et al. 2020

Self Cite

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Geomorphological regionalization (geomor-region) and geomorphological type (geomor-type) classification are two core components in the geomorphologic research. Although remarkable achievements have been made in the study of geomor-region, many deficiencies still exist, such as the inconsistency of landform indicators, the small quantity of division orders, disparities of geomorphological characteristics, differences of mapping results, and the small scale of zoning maps. Requirements for improved national geomor-regions are therefore needed for the purpose of an enhanced national geo-information system. Based on theories of geomor-region in China including plate tectonics, crustal features, endogenic and exogenic forced geomorphological features, and regional differentiations of geomor-type, a three-order (major-region, sub-region, and small-region) research program on China's geomor-regions is proposed on the basis of previous 2013 geomor-region system. The major contents of the new geomor-region scheme are: (1) principles of the national multi-order geomor-regions; (2) hierarchical indicator systems of geomor-regions including characteristics of the terrain ladder under the control of tectonic setting, combinations of regional macro-form types, combinations of endogenic and exogenic forces and basic types of morphology, combinations of regional morphological types, and combinations of regional micro-morphological types; (3) naming rules and coding methods of geomor-regions; and (4) precise positioning techniques and methods of multi-order geomor-region divisions based on multi-source data. Using the new geomor-region theory and division methodology, the partition of national three-order geomor-regions of China was successfully constructed. The geomor-region system divided China into six first-order major-regions, 36 second-order sub-regions, and 136 third-order small-regions. In addition, a database and management information system of the national geomor-regions were established. This research has an important guiding significance for promoting the development of China's regional geomorphology and for practical applications based on geomor-regions.

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Spatio-temporal distribution and transformation of cropland in geomorphologic regions of China during 1990–2015

Cited by 56 publications

References 27 publications

Ecological Risk Assessment and Impact Factor Analysis of Alpine Wetland Ecosystem Based on LUCC and Boosted Regression Tree on the Zoige Plateau, China

Ecological Risk Assessment and Impact Factor Analysis of Alpine Wetland Ecosystem Based on LUCC and Boosted Regression Tree on the Zoige Plateau, China

Exploring cultivated land evolution in mountainous areas of Southwest China, an empirical study of developments since the 1980s

Geomorphological regionalization theory system and division methodology of China

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