Improved permafrost stability by revegetation in extremely degraded grassland of the Qinghai-Tibetan Plateau

Jia, Yinglan; Chen, Shengyun; Wu, Minghui; Gu, Yuzheng; Wei, Peijie; Wu, Tonghua; Shang, Zhanhuan; Wang, Shijin; Yu, Hongyan

doi:10.1016/j.geoderma.2023.116350

Cited by 14 publications

(2 citation statements)

References 59 publications

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“…To begin, the frequency ranges of positive and negative soil temperature and the sum of positive and negative accumulated soil temperature were calculated in a day. Subsequently, the two were standardized to the value 0-1 and then multiplied to obtain the freeze-thaw strength (Jia et al 2023).…”

Section: Discussionmentioning

confidence: 99%

Effects of freeze-thaw cycles on the size distribution and stability of soil aggregate in the permafrost regions of the Qinghai-Tibetan Plateau

Dong,

Gu,

Jia

et al. 2023

Environ. Res. Commun.

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As the basic units of soil structure, soil aggregate are essential for maintaining soil stability. Intensified freeze-thaw cycles have deeply affected the size distribution and stability of aggregate under global warming. To date, we are still lacking about the effect of freeze-thaw cycles on aggregate in the permafrost regions of the Qinghai-Tibetan Plateau (QTP). Therefore, we investigated the effects of diurnal freeze-thaw cycles and seasonal freeze-thaw processes on soil aggregate by in-situ studies. Our results showed that the durations of thawing and freezing periods in the 0-10 cm soil layer were longer than in the 10-20 cm soil layer, while the opposite for completely thawed and frozen periods. Freeze-thaw strength was greater in the 0-10 cm layer than that in the 10-20 cm layer. The diurnal freeze-thaw cycles might not have significant effect on the size distribution and stability of aggregate. However, < 0.25 mm fraction dominated wet sieving aggregate with the highest proportion during the thawing period, while the proportions of 0.5-1 mm and 1-3 mm fractions reached the highest during the completely frozen period in the 0-20 cm layer (P < 0.05). Likewise, the mean weight diameter and water-stable aggregate were decreased during the thawing period compared with other periods, which were influenced by soil microbial biomass carbon and belowground biomass. Hence, the seasonal freeze-thaw processes destroyed macro-aggregate (> 0.25 mm) and reduced aggregate stability. Our study has a scientific guidance for evaluating the effects of freeze-thaw cycles on aggregate and provides a theoretical basis for further exploration on soil and water conservation in the permafrost regions of the QTP.

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Section: Discussionmentioning

confidence: 99%

Effects of freeze-thaw cycles on the size distribution and stability of soil aggregate in the permafrost regions of the Qinghai-Tibetan Plateau

Dong,

Gu,

Jia

et al. 2023

Environ. Res. Commun.

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“…Vegetation has a beneficial impact on safeguarding permafrost, leading to slower rates of permafrost degradation and subsequently, a deceleration in SOC change [69]. Within the region of permafrost degradation, forestlands are the primary contributors to an increase in SOC, while grasslands are a factor in SOC reduction.…”

Section: Soc In Different Lulc and Response To Changes In Permafrostmentioning

confidence: 99%

The Impact of Permafrost Change on Soil Organic Carbon Stocks in Northeast China

Song,

Huang,

Zhang

et al. 2023

Forests

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Climate warming has resulted in significant changes in permafrost in Northeast China, leading to notable alterations in soil organic carbon (SOC) stocks. These changes are crucial for both the global carbon cycle and climate change, as well as directly impacting the sustainable development of ecosystems. In order to examine the SOC dynamics and the impact of permafrost changes on SOC, we investigate the changes of permafrost extent based on a regression model and TTOP (top temperature of permafrost) model and the relationship between land use and land cover (LULC), SOC stocks, and permafrost changes in Northeast China. The results showing a shrinking permafrost area from 37.43 × 104 km2 to 16.48 × 104 km2 during the period from the 1980s to the 2010s in Northeast China, and the SOC stock decreased by 24.18 Tg C from the 1980s to the 1990s and then rapidly increased by 102.84 Tg C in the 2000s. Permafrost degradation speeds up the succession of LULC, impacting about 90% of the SOC in permafrost regions. The relationship between permafrost changes and SOC in Northeast China shows that permafrost degradation significantly reduces SOC stocks in the short term but increases SOC stocks in the long term, and that LULC play a crucial role in regulating this relationship. The goals of this study are to acquire an understanding of permafrost status and deepening insights into the dynamics of SOC. Simultaneously, the study aims to furnish valuable scientific references for shaping policies on sustainable land use and management in the future, all the while advancing the cause of ecological equilibrium and sustainable development in Northeast China and other areas.

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Nitrogen application increases the productivity of perennial alpine cultivated grassland by improving soil physicochemical properties and microbial community characteristics

Tong,

Dong,

et al. 2024

Plant Soil

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Improved permafrost stability by revegetation in extremely degraded grassland of the Qinghai-Tibetan Plateau

Cited by 14 publications

References 59 publications

Effects of freeze-thaw cycles on the size distribution and stability of soil aggregate in the permafrost regions of the Qinghai-Tibetan Plateau

Effects of freeze-thaw cycles on the size distribution and stability of soil aggregate in the permafrost regions of the Qinghai-Tibetan Plateau

The Impact of Permafrost Change on Soil Organic Carbon Stocks in Northeast China

Nitrogen application increases the productivity of perennial alpine cultivated grassland by improving soil physicochemical properties and microbial community characteristics

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