# Changes in Soil Moisture Improved by High-Performance Ester Materials under Dry-Wet Cycles
## 1 Introduction  
Soil moisture determines the amount of water available for plant growth and development. It has a significant impact on plant growth and the soil's ecological performance [1]. It directly affects the soil's quality. If soil's moisture retention is poor, its ecological performance will deteriorate. Soil's electrical conductivity (EC) is also closely related to its moisture levels and ecological performance [2]. Electrical conductivity [3, 4] is an important indicator of inorganic nutrients in a soil's surface that plants can quickly utilize. It represents the amount of nutrients available in the soil for plant growth, and the magnitude of a soil's electrical conductivity is also closely related to soil moisture. The more water soil holds, the higher its EC will be [5]. Therefore, improving soil's water holding capacity plays an important role in improving its ecological performance.  
High-performance ester materials can improve soil's moisture and ecological performance. [PERSON] [6] improved soil moisture by using super absorbent hydrogel nanocomposites, resulting in a significant increase in soil moisture and plant growth. High-performance ester materials can change soil's physicochemical properties, increase moisture, improve plant growth conditions, and are environmentally friendly materials [7]. The materials enhance the soil's water holding capacity and create suitable conditions for plant growth and development [8]. [PERSON] [9] used high-performance ester materials to enhance soil water retention and ecological performance. The study found that the materials can reduce soil moisture evaporation, increase soil moisture, and promote plant growth. A plant'sgrowth requires not only sufficient water, but also nutrients. To improve soil's ecological performance, it is necessary to increase its nutrients. [PERSON] [10] found through experiments that high-performance ester materials can increase the number of large aggregates in the soil and thereby enhance the soil's ability to store nutrients, which can increase the soil's electrical conductivity. However, the study still lacks a data-based interpretation of conductivity changes. Moreover, whether the improvement of soil conductivity and moisture by the materials weakens after dry-wet cycles has not been fully studied. A large number of studies have clarified the positive effect of ester materials on soil's moisture levels and ecological performance. However, currently, the changes in soil's moisture and ecological performance improved by high-performance ester materials under dry-wet cycling conditions are not yet clear, which restricts the wider use of ester materials in soil's ecological restoration. Soil in nature constantly undergoes moisture absorption and dehumidification cycles, which can lead to changes in its properties. The dry-wet cycle can alter the structure and physicochemical properties of soil, such as its cohesion [11; 12]. Destroying the internal aggregate structure of soil can have an impact on the soil's water characteristics, thereby affecting its moisture levels and ecological performance [13]. To better improve soil's ecological performance, it is essential to investigate the changes in soil moisture enhanced by high-performance ester materials under dry-wet cycling conditions.  
This study investigated changes in soil's moisture and ecological performance improvement by high-performance ester materials under dry-wet cycling conditions. Dry-wet cycling and planting tests on ester materials to improve soil moisture and ecological performance were conducted. The study aimed to investigate the improvement effect of ester materials on soil's water holding capacity, electrical conductivity (EC), and ecological performance under dry-wet cycling conditions, and to reveal their mechanism and changes. This article provides new data and technical guidance for the use of high-performance ester materials in the ecological restoration of soil.