Progressive landscape fragmentation in relation to cash crop cultivation |
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| Institution: | 1. School of Resource and Environmental Sciences, Wuhan University, Wuhan, China;2. Key Laboratory of Geographical Information Systems, Ministry of Education, Wuhan University, Wuhan, China;3. Key Laboratory of Digital Mapping and Land Information Application Engineering, National Administration of Surveying, Mapping and Geoinformation, Wuhan University, Wuhan, China;1. College of Environment and Planning, Henan University, Kaifeng 475-004, China;2. Center for Southeast Asian Studies, Kyoto University, Kyoto 606-8501, Japan;3. Graduate School of Asian and African Area Studies, Kyoto University, Kyoto 606-8501, Japan;4. Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666-303, China;5. Research Center for Urban Planning and Development, Fudan University, Shanghai 200433, China;1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, China;2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, China;3. College of Geomatics, Xi’an University of Science and Technology, Xi’an, China;1. Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China;2. Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh EH3 5LR, UK;3. National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore;4. East-West Center, 1601 East-West Road, Honolulu, HI 96848, USA;5. World Agroforestry Center, East and Central Asia, Kunming, 650201, China |
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| Abstract: | Cash crop cultivation has been a critical driver of land use change in many countries around the world. However, few efforts have been made to quantify the relationships between cash crop expansion and the subsequent landscape pattern changes. This paper characterized the process of cash crop expansion across Tiaoxi watershed (China) from 1985 to 2009 using multi-sensor and multi-temporal remotely sensed imageries. Correlations were identified between indicators of cash crop expansion (total area and total production of cash crops) and a family of landscape fragmentation metrics (patch density, edge density, landscape division index, effective mesh size, splitting index, Shannon's diversity index, and aggregation index). Results showed that Tiaoxi watershed experienced profound cash crop expansion and progressive landscape fragmentation. The cash crops spread in accessible and productive areas at the expense of paddy and forests. Social drivers of cash crop expansion included population growth, labor structure changes and market incentives. Indicators of cash crop expansion presented linear relationships with landscape fragmentation metrics. These findings evidenced that cash crop cultivation would significantly fragment landscapes. Our study contributed to understanding on the enlarging cultivation of cash crops and the associated modifications of landscape patterns in subtropical regions. |
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| Keywords: | Cash crop expansion Landscape fragmentation Land use change Driver Remote sensing |
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