粉垄耕作方式在土壤剖面上形成了独特的“粉垄层”，致使粉垄层内部的水文过程及其水分的植被吸收利用过程发生变化，进一步促使作物达到增产的效果。然而，粉垄耕作方式对土壤水文功能的影响及其对作物增产的影响机制尚不明晰，增加了对粉垄层中水分科学利用和管理难度。本项目以广西旱坡地广泛种植的甘蔗为研究对象，通过野外定位观测试验和室内分析实验，结合CT扫描技术、同位素技术和模型模拟，分析粉垄层上下界面处的水分运动过程，探明粉垄耕作对土壤水文过程的影响机制，明确甘蔗根系对粉垄层和非粉垄层中水分的相对利用比例和效率，揭示粉垄耕作方式土壤水文特征的变化对甘蔗增产的影响机理。研究结果对深入认识粉垄层内水分的生态功能具有重要的科学意义，另一方面也为雨养条件下广西旱坡地甘蔗地土壤水分管理和调控提供科学依据。

Deep vertical rotary Layer （DVRL）is generally formed during the process of deep vertical rotary tillage. The formation of DVRL alters its hydrological processes and water absorption and utilization processes by vegetation, thus can improve crop yield. We have, however, poor knowledge about the influence of DVRL on soil hydrological function and the soil water utilization mechanisms by vegetation, limiting the scientific utilization and management of soil water retained within the DVRL. The sugarcane is selected as research object, which is widely cultivated in dry slope land of Guangxi province. A combination of filed location observation, lab analysis experiments, computed tomography scanning, isotope techniques, and model simulation will be used as a research tool. We aim (1) to analyze water movement processes at the interfaces between DVRL and non-DVRL (including the upper boundary and the lower boundary), (2) to explore the influence mechanism of deep vertical rotary tillage on soil hydrological process, (3) to ascertain the relative proportion and efficiency of soil water uptake from DVRL and non-DVRL, and (4) to reveal the dynamic of soil hydrological characteristics and its influence mechanism on increasing sugarcane yield. This research has important scientific significance for further understanding the ecological function of water in DVRL. It also provides a scientific basis for soil water management and regulation of sugarcane field under rain-fed condition in dry slope land of Guangxi province.