调查牲畜放牧、山坡位置和取样深度对土壤水分特征曲线的长期影响

IF 2.4 3区 环境科学与生态学 Q2 ECOLOGY
Manijeh Nosrati Ramesh, Eisa Ebrahimi, Hossein Bayat
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引用次数: 0

摘要

土壤水分特征曲线 (SMCC) 在理解和管理土壤与水的关系方面发挥着至关重要的作用,这在农业、土木工程、环境科学和水文学等多个领域都至关重要。本研究调查了放牧、斜坡位置和取样深度对伊朗西部贡巴德流域土壤水分特征曲线的影响。比较了自由放牧和控制放牧两种放牧方式,以及三种坡位(肩坡、背坡和脚坡)和两种取样深度(0-12.5 厘米和 12.5-25 厘米)。采用 van Genuchten 模型来模拟 SMCC,并结合了 Mualem 假设。采用因子设计评估了不同基质吸力下的含水率和 van Genuchten 模型参数。计算了积分均方根差(IRMSD)和表面差(SD)参数,以评估不同处理对SMCC整体的影响。后坡控制放牧处理的残余含水量最低,0.00 至 12.5 厘米深度的残余含水量为 0.151 cm³ cm-³。相反,在肩部的自由放牧处理中,特别是在 12.5 至 25 厘米的深度,观察到的残余水含量最高,为 0.234 cm³ cm-³。结果表明,第二深度的永久枯萎点(PWP)值超过了第一深度。具体来说,在第二深度,自由放牧下坡肩区域的永久枯萎点值(0.235 cm³ cm-³)超过了控制放牧下相应位置的永久枯萎点值(0.192 cm³ cm-³)。研究结果表明,在控制放牧条件下,背斜位置第一深度的α参数值(0.438 cm-1)最高。结果表明,放牧、坡位和取样深度对土壤特性和 SMCC 参数有明显影响。值得注意的是,与自由放牧相比,控制放牧导致了更高的 IRMSD 值(0.178 cm³ cm-³)和 SD 值(0.672 cm³ cm-³),表明保墒能力增强。这项研究为优化放牧方法,实现牧场生态系统的可持续土壤健康和水资源管理提供了宝贵的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigating the Long-Term Effect of Livestock Grazing, Slope Location, and Sampling Depth on Soil Moisture Characteristic Curves

Soil moisture characteristic curves (SMCCs) play a crucial role in understanding and managing soil-water relationships, which is vital in various fields including agriculture, civil engineering, environmental science, and hydrology. This study investigates the impact of livestock grazing, slope location, and sampling depth on SMCCs in the Gonbad watershed, western Iran. Livestock grazing practices were compared between free grazing and controlled grazing, along with three slope positions (shoulder, back, and foot-slope) and two sampling depths (0−12.5 cm and 12.5−25 cm). The van Genuchten model was employed to model the SMCC, incorporating Mualem's assumption. Water content at different matric suctions and van Genuchten model parameters were assessed using a factorial design. Integral root mean square difference (IRMSD) and surface difference (SD) parameters were calculated to evaluate the impact of different treatments on the SMCC, as a whole. The controlled grazing treatment at the back-slope recorded the lowest residual water content, measuring 0.151 cm³ cm⁻³ in the 0.00- to 12.5-cm depth. Conversely, the highest value of 0.234 cm³ cm⁻³ was observed in the free grazing treatment at the shoulder, specifically in the 12.5- to 25-cm depth. The results indicate that the permanent wilting point (PWP) value at the second depth exceeded that of the first depth. Specifically, at the second depth, the PWP value in the shoulder region of the slope under free grazing (0.235 cm³ cm⁻³) surpassed that of the corresponding position under controlled grazing (0.192 cm³ cm⁻³). The findings revealed that the highest α parameter value (0.438 cm−1) was observed at the first depth of the back-slope position under the controlled grazing treatment. Results indicated significant effects of grazing, slope position, and sampling depth on soil properties and SMCC parameters. Notably, controlled grazing led to higher values of IRMSD (0.178 cm³ cm⁻³) and SD (0.672 cm³ cm⁻³), indicating enhanced moisture retention capabilities compared with free grazing. The study provides valuable insights into optimizing grazing practices for sustainable soil health and water management in pasture ecosystems.

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来源期刊
Rangeland Ecology & Management
Rangeland Ecology & Management 农林科学-环境科学
CiteScore
4.60
自引率
13.00%
发文量
87
审稿时长
12-24 weeks
期刊介绍: Rangeland Ecology & Management publishes all topics-including ecology, management, socioeconomic and policy-pertaining to global rangelands. The journal''s mission is to inform academics, ecosystem managers and policy makers of science-based information to promote sound rangeland stewardship. Author submissions are published in five manuscript categories: original research papers, high-profile forum topics, concept syntheses, as well as research and technical notes. Rangelands represent approximately 50% of the Earth''s land area and provision multiple ecosystem services for large human populations. This expansive and diverse land area functions as coupled human-ecological systems. Knowledge of both social and biophysical system components and their interactions represent the foundation for informed rangeland stewardship. Rangeland Ecology & Management uniquely integrates information from multiple system components to address current and pending challenges confronting global rangelands.
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