[1]ZHAO Xin,ZHOU Zhongfa,ZHU Meng,et al.Research on Ecological Risk of Karst Rocky Desertification Cultivated Land Based on Landscape Pattern[J].Research of Soil and Water Conservation,2020,27(06):362-369,376.
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Research on Ecological Risk of Karst Rocky Desertification Cultivated Land Based on Landscape Pattern
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 06
Page number:
362-369,376
Column:
目次
Public date:
2020-10-20
- Title:
- Research on Ecological Risk of Karst Rocky Desertification Cultivated Land Based on Landscape Pattern
- Keywords:
- rocky desertification farmland; ecological risk; hierarchical classification; landscape pattern; southwest China
- CLC:
- S181; X826
- DOI:
- -
- Abstract:
- In order to explore the differences in landscape ecological risks of different arable land types under complex terrain in the Southwest Mountainous Area, and explore the development of cultivated land under different rocky desertification environments, we selected remote sensing images of Xifeng County in the period 2013—2017, used deep learning to extract, and classified the cultivated land according to rock desertification grades. Integrally considering different risk sources such as external stress, soil pollution stress, and farmers' interference, we calculated the ecological risks of different types of cultivated land landscape. The results showed that:(1)the cultivated land in Xijing County had decreased by 8 149 hm2 in the past five years; among which the karst dry land decreased by 29% in 2015, and the karst dry land decreased by 96% in 2017; it could be seen that the fragmentation and separation of various cultivated land landscapes in Xifeng County were inversely proportional to area changes, and the degree of landscape dominance was directly proportional to area changes by calculating the index of various cultivated land landscapes;(2)the spatial and temporal changes in the natural loss and ecological risk probability of various types of cultivated land landscapes had resulted in the ecological risk of cultivated land landscapes in Xifeng County with low risk in the southwest and high risk in the north and south; the average ecological risk of cultivated land landscape on the time scale decreased in the order: 2015>2013>2017, which were 0.186, 0.118, and 0.112, respectively;(3)based on the grey correlation proof analysis, it was concluded that the risk of various cultivated land landscapes in Xifeng County was significantly affected by urban development and rural modernization, and the correlation in 2015 was lower than in other years. This study found that the ecological risk of cultivated land under different levels of rocky desertification was different.
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Last Update:
2020-10-20