Soil organic carbon recovery and soil health in semi-arid drylands with years of transition to perennial grasses

IF 2.6 3区 环境科学与生态学 Q2 ECOLOGY
Dotun Arije , Rajan Ghimire , Prakriti Bista , Sangamesh V. Angadi , Charlotte C. Gard
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引用次数: 0

Abstract

Semi-arid drylands face unique challenges for sustainable land management and soil carbon (C) sequestration due to significant depletion in soil organic carbon (SOC) storage, increasing water scarcity, and climate change. Restoring perennial grasses could regenerate these lands, enhancing SOC storage and soil health. This study investigated the SOC recovery potential, C saturation limit, and time required for the saturation in semi-arid drylands with perennial grass sequences. Soil samples were collected from 0 to 15 and 15–30 cm depths of an annual winter wheat system (AWWS) and three perennial grass sequences, i.e., 3-years of perennial grass (3YPG), 6-years of perennial grass (6YPG), and 20-years of perennial grass (20YPG), each replicated four times. Results reveal significant depth-dependent variations in soil parameters while maintaining the ranking of 20YPG > 6YPG > AWWS > 3YPG in SOC storage at 0–15 cm soil depth. Linear regression analysis showed a SOC sequestration rate of 0.46 Mg ha−1 yr−1 across grass sequences. Total nitrogen (TN), potentially mineralizable nitrogen (PMN), mineral-associated organic carbon (MAOC), and particulate organic carbon (POC) accumulated at rates of 0.04 Mg ha−1 yr−1, 0.34 kg ha−1 yr−1, 0.24 Mg ha−1 yr−1, and 0.22 Mg ha−1 yr−1, respectively, across all treatments in the surface soil layer. A regression model predicted that the 20YPG field would reach MAOC saturation in approximately 80 years at the 0–15 cm depth and 230 years at the 15–30 cm depth if the current condition persists. This research shows the enormous potential of SOC sequestration in arid and semi-arid drylands with grassland restoration. It also underscores the significance of perennial grass systems in enhancing soil health and SOC sequestration. Identifying grass species producing high, economically useful biomass in water-limited semi-arid environments may provide agricultural sustainability and climate change solutions for dry regions.
半干旱旱地土壤有机碳的恢复和土壤健康与多年生草的过渡年份
由于土壤有机碳(SOC)储量严重枯竭、水资源日益匮乏以及气候变化,半干旱旱地在可持续土地管理和土壤碳(C)固存方面面临着独特的挑战。恢复多年生草本植物可以使这些土地再生,提高土壤有机碳的储存量和土壤健康。本研究调查了多年生草地序列半干旱旱地的 SOC 恢复潜力、C 饱和极限以及饱和所需的时间。在一年生冬小麦系统(AWWS)和三种多年生草地序列(即 3 年生草地(3YPG)、6 年生草地(6YPG)和 20 年生草地(20YPG))的 0 至 15 厘米和 15 至 30 厘米深度采集了土壤样本,每个序列重复四次。结果表明,在 0-15 厘米土层深度,土壤参数随深度变化很大,但在 SOC 储量方面,20 年生草、6 年生草、AWWS 和 3 年生草的排名保持不变。线性回归分析表明,各草地序列的 SOC 固存率为 0.46 兆克/公顷-年-1。在表层土壤的所有处理中,总氮(TN)、潜在矿化氮(PMN)、矿质相关有机碳(MAOC)和颗粒有机碳(POC)的累积率分别为 0.04 兆克/公顷-1 年-1、0.34 千克/公顷-1 年-1、0.24 兆克/公顷-1 年-1 和 0.22 兆克/公顷-1 年-1。根据回归模型预测,如果目前的状况持续下去,20YPG 农田 0-15 厘米深处的 MAOC 将在大约 80 年后达到饱和,15-30 厘米深处的 MAOC 将在 230 年后达到饱和。这项研究表明,在干旱和半干旱旱地,通过草地恢复固存 SOC 的潜力巨大。它还强调了多年生草地系统在增强土壤健康和固碳方面的重要性。在水资源有限的半干旱环境中确定能产生大量经济有用生物量的草种,可为干旱地区提供农业可持续发展和气候变化解决方案。
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来源期刊
Journal of Arid Environments
Journal of Arid Environments 环境科学-环境科学
CiteScore
5.70
自引率
3.70%
发文量
144
审稿时长
55 days
期刊介绍: The Journal of Arid Environments is an international journal publishing original scientific and technical research articles on physical, biological and cultural aspects of arid, semi-arid, and desert environments. As a forum of multi-disciplinary and interdisciplinary dialogue it addresses research on all aspects of arid environments and their past, present and future use.
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