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[Soil water availability in new-cultivated hillside land]
Yirong Su1, Yu Huang, Kelin Wang
1Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China. yrsu@isa.ac.cn
Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|August 19, 2003
Summary
Soil water dynamics differ between sugarcane fields and uncultivated land, with valley sugarcane fields fully retaining precipitation. Uncultivated land shows the slowest water consumption, crucial for understanding water availability.
Area of Science:
- Soil Science
- Hydrology
- Agricultural Science
Background:
- Understanding soil water dynamics is crucial for sustainable agriculture, especially in newly cultivated areas.
- Rainfall infiltration and water retention vary significantly based on topography and land cover.
- Assessing soil moisture is vital for crop management and water resource planning in arid and semi-arid regions.
Purpose of the Study:
- To investigate the dynamics of available soil water content in different soil layers and locations.
- To compare water retention and consumption rates between sugarcane fields and uncultivated land.
- To analyze seasonal variations in soil moisture distribution and saturation.
Main Methods:
- Field monitoring of soil water content across three layers (0-20, 20-40, 40-60 cm).
- Measurements taken at various time points before and after rainfall during both rainy and dry seasons.
- Comparison of water content, distribution, and consumption rates across different land uses (sugarcane vs. uncultivated) and topographic positions (mesoslope, downgrade, valley).
Main Results:
- Available soil water increment after rain was equal to precipitation in valley sugarcane fields, but 80% in mesoslope fields and uncultivated land.
- Soil water distribution was uniform in the rainy season but concentrated in the surface layer during the dry season.
- Uncultivated land exhibited the lowest water consumption rate, and dry season moisture was depleted within 15 days post-rainfall.
Conclusions:
- Land use and topography significantly influence soil water dynamics and retention capacity.
- Sugarcane cultivation, particularly in valley locations, enhances water retention compared to uncultivated areas.
- Seasonal patterns critically affect soil moisture availability, with rapid depletion during the dry season necessitating careful water management strategies.