Analyzing on Comprehensive Treatment Measures and Origin of Qianjiangping Landslide in Three Gorges Reservoir Area

Qianjiangping landslide, which occurred in the Three Gorges Reservoir Area, is one of the serious landslide disasters in this area after impounding. Based on site investigation, and investigation of the related reference materials and analyzing the origin caused this disaster we think the special geological and geomorphic conditions and concentrated rainfall are the main factors. Some suggestions on engineering treatment technology, the measures of nature restoring vegetation and ecology restoring vegetation, which are useful to the landslide treatment of analogous project, are put forward---That is, for happened landslide and potential dangerous areas it is necessary to do hill’s drainage and slope protection; the method for natural restoration vegetation is to close the mountains for natural afforestation to reduce the human interference; and the way for ecological restoration vegetation is to restore and rehabilitate Eco-economic vegetation.

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Effects of Landscape Positions and Landscape Types on Soil Properties and Chlorophyll Content of Citrus in a Sloping Orchard in the Three Gorges Reservoir Area, China

Sustainability ◽

10.3390/su13084288 ◽

2021 ◽

Vol 13 (8) ◽

pp. 4288

Author(s):

Siyue Sun ◽

Guolin Zhang ◽

Tieguang He ◽

Shufang Song ◽

Xingbiao Chu

Keyword(s):

Soil Properties ◽

Chlorophyll Content ◽

Three Gorges Reservoir ◽

Slope Position ◽

Three Gorges Reservoir Area ◽

Three Gorges ◽

Reservoir Area ◽

The Three Gorges Reservoir ◽

The Three Gorges ◽

Landscape Types

In recent years, soil degradation and decreasing orchard productivity in the sloping orchards of the Three Gorges Reservoir Area of China have received considerable attention both inside and outside the country. More studies pay attention to the effects of topography on soil property changes, but less research is conducted from the landscape. Therefore, understanding the effects of landscape positions and landscape types on soil properties and chlorophyll content of citrus in a sloping orchard is of great significance in this area. Our results showed that landscape positions and types had a significant effect on the soil properties and chlorophyll content of citrus. The lowest soil nutrient content was detected in the upper slope position and sloping land, while the highest exists at the footslope and terraces. The chlorophyll content of citrus in the middle and upper landscape position was significantly higher than the footslope. The redundancy analysis showed that the first two ordination axes together accounted for 81.32% of the total variation, which could be explained by the changes of soil total nitrogen, total phosphorus, total potassium, available nitrogen, available potassium, organic matter, pH, and chlorophyll content of the citrus. Overall, this study indicates the significant influence of landscape positions and types on soil properties and chlorophyll content of citrus. Further, this study provides a reference for the determination of targeted land management measures and orchard landscape design so that the soil quality and orchard yield can be improved, and finally, the sustainable development of agriculture and ecology can be realized.

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