Spatial variation of soil organic carbon in the Qinghai Lake watershed, northeast Qinghai-Tibet Plateau

Ma, Yujun; Xie, Ting; Li, Xiaoyan

doi:10.1016/j.catena.2022.106187

Cited by 16 publications

(4 citation statements)

References 48 publications

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“…Many scholars have already conducted research on the vertical variation of SOCD, and their findings indicated that the surface soil had a higher SOCD compared to the lower layers [9,[62][63][64]. In our study, we also observed a similar distribution pattern of SOCD (Fig.…”

Section: B Variation Of Socd In Soil Profilesupporting

confidence: 85%

Identification and Evolution of Soil Organic Carbon Density Caused by Coastal Rapid Siltation Based on Imaging Spectroscopy

Wang

Zheng

Wei

et al. 2023

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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This study aimed to investigate the feasibility of using imaging spectroscopy (IS) to predict soil organic carbon density (SOCD) either directly or indirectly through soil organic carbon (SOC). Three methods, partial least square regression (PLSR), support vector machine (SVM), and random forest (RF), were utilized to calibrate the models and map the SOCD. The results showed that direct prediction was better than indirect prediction and the best model SVM had high R 2 of 0.94 and 0.93 for calibration and validation, respectively. The measured SOCD was mainly concentrated in the surface soil layer from 0 to 40 cm, and the deeper layer tended to be gentle. The continuous depth variation trend of SOCD in the topsoil (0-40 cm) was relatively close to the measured values, while in the deeper layers (below 40 cm), it was much higher than the measured values. The study also found that the best fitting function of measured SOC stocks over time varied from linear to power and then to logarithmic with increasing depth, indicating less efficient accumulation of SOC in deep soil compared to topsoil, resulting in an overall decrease in SOC accumulation rate across soil depth. The best temporal functions for the predicted values differed from the measured values at each depth, but the changing trends of the three functions were basically consistent. It suggests that IS technology has the potential to quantitatively reveal the process of coastal soil evolution and offers a new insight for the rapid monitoring of soil property changes.

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Section: B Variation Of Socd In Soil Profilesupporting

confidence: 85%

Identification and Evolution of Soil Organic Carbon Density Caused by Coastal Rapid Siltation Based on Imaging Spectroscopy

Wang

Zheng

Wei

et al. 2023

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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“…The Qinghai Lake basin is in the northeastern part of the Tibetan Plateau, between 36 • 00 -38 • 20 N and 97 • 00 -102 • 00 E, with an elevation of about 3100-5200 m (Figure 1) and a total area of about 30,000 km 2 [29,30]. It has a typical plateau semi-arid climate with dryness, little rain, strong light, and large temperature differences between day and night.…”

Section: Study Areamentioning

confidence: 99%

Effects of Climate Change and Nitrogen Addition on Carbon Loss in Alpine Wetland of Qinghai–Tibet Plateau

Xu,

Wang,

Zhu

2023

Atmosphere

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Soil microorganisms and soil organic carbon (SOC) play important roles in ecosystem cycling, but there is a lack of clarity about the effects of nitrogen addition on soil microorganisms and SOC, as well as the key microbial taxa that influence SOC. This study was conducted in the alpine wetland of Xiaopo Lake in the Qinghai Lake basin, using NH4NO3 as the nitrogen source, three nitrogen addition gradients (N2: 2 g/m2, N5: 5 g/m2, N10: 10 g/m2), and a blank control treatment (N0: 0 g/m2), with three replicate experiments for each treatment. The main findings were as follows: (1) Both increased soil temperature and decreased precipitation reduced SOC content. SOC content gradually decreased with increasing nitrogen concentration; SOC was reduced by 3.36–29.54% and 8.57–26.66% at 0–15 cm and 15–30 cm soil depths, respectively. (2) Proteobacteria, Chloroflexi, Acidobacteria, and Actinobacteria were the main dominant species, and their changes determined the changes in the entire bacterial community. The relative abundance of Proteobacteria and Actinobacteria decreased under nitrogen addition; Acidobacteria increased significantly; and Chloroflexi did not change significantly. The overall abundance and diversity of soil bacteria showed an increasing trend. The number of soil bacteria is a key factor affecting SOC content, and an increase in the number and diversity of soil bacteria enhances their decomposition capacity, and thus, reduces SOC content. (3) Increased soil temperatures and decreased precipitation are associated with decreased SOC and are the main climatic factors affecting SOC. This study provides a reference for the rational utilization and management of wetland ecosystems under climate change.

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“…Altitude is an important factor influencing heat as well as plant distribution in mountainous environments, subsequently affecting spatial variability of SOC by creating local microclimates and influencing the accumulation and decomposition rates of plant litter (Cao et al, 2017; Zhu et al, 2019). ST and humidity have shown showed a strong decreasing trend within a certain altitude range at the global scale (Ma et al, 2022; Xu et al, 2020). Changes in hydrothermal conditions affect the growth and development of plants, the activity of microorganisms and the processes of SOC fixation and decomposition (Clark & Sizmur, 2022; Davidson & Janssens, 2006).…”

Section: Introductionmentioning

confidence: 99%

Examining soil organic carbon in the mountainous peat swamps of the Zoigê Plateau in China's Qinghai‐Tibet Plateau

Zhang

Zhao

Bai

et al. 2023

Soil Use and Management

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Mountainous peatlands are one of the most important terrestrial ecosystems for carbon storage and play an important role in the global carbon cycle. An insight into the carbon cycle of peat swamps located in mountainous regions can be obtained by studying the distribution of soil organic carbon (SOC) and its relationships with environmental factors. This study focused on the development conditions of peat swamps in the Gahai wetlands, located on the Zoigê Plateau, China, with four different altitudinal gradients as experimental sample sites. The distribution of SOC and its relationship with environmental factors were analysed through vegetation surveys and a generalized additive model (GAM). The results show that with increasing altitude, soil temperature decreased while the soil pH and bulk density initially decreased then increased. On the contrary, the topographic wetness index (TWI), SOC content, above-ground biomass and litter count initially increased then decreased. The SOC content of the 0-30 cm soil layer was in the range 226-330 g•kg −1 (coefficient of variation (CV) = 21.4%), and the 30-60 cm layer was 178-257 g•kg −1 (CV = 17.5%) and was significantly correlated (p < .05) with above-ground biomass and litter count. Meanwhile, the SOC content in the 60-90 cm soil layer was in the range 132-167 g•kg −1 (CV = 9.2%) with a significant correlation (p < .05) with soil temperature, pH, bulk density and topographic moisture index. The study showed that the SOC content exhibited more pronounced spatial patterns with increasing altitude, with the peak value in the shallow soil layer appearing in lower elevation areas compared with the deep soil layer. The level of variation changed from medium to low, reflecting the stable mechanism for maintaining SOC within the heterogeneous peat swamp environment.

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Spatial variation of soil organic carbon in the Qinghai Lake watershed, northeast Qinghai-Tibet Plateau

Cited by 16 publications

References 48 publications

Identification and Evolution of Soil Organic Carbon Density Caused by Coastal Rapid Siltation Based on Imaging Spectroscopy

Identification and Evolution of Soil Organic Carbon Density Caused by Coastal Rapid Siltation Based on Imaging Spectroscopy

Effects of Climate Change and Nitrogen Addition on Carbon Loss in Alpine Wetland of Qinghai–Tibet Plateau

Examining soil organic carbon in the mountainous peat swamps of the Zoigê Plateau in China's Qinghai‐Tibet Plateau

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