Changes of soil properties regulate the soil organic carbon loss with grassland degradation on the Qinghai-Tibet Plateau

Peng, Fei; Xue, Xian; You, Qinglong; Huang, Cuihua; Dong, Siyang; Liao, Jie; Duan, Hanchen; Tsunekawa, Atsushi; Wang, Tao

doi:10.1016/j.ecolind.2018.05.047

Cited by 78 publications

(57 citation statements)

References 47 publications

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“…Additionally, grassland degradation has led to severe deterioration in biodiversity-ecosystem function and services such as soil aeration, water holding capacity, carbon accumulation, and plant biomass storage [28,54]. Furthermore, grassland degradation has resulted in soil organic carbon loss [91]; reduced plant cover and ecosystem carbon and nitrogen storage [92]; negatively affected the ecological security and local economy of China [42]; transformed grasslands into a harsh environment [69]; caused a decline in soil organic matter [93]; reduced traditional biomass by locals [67]; reduced soil moisture content due to disturbance by pikas on the plateau; and caused a decline in soil organic carbon [56].…”

Section: Effects Of Grassland Degradation On Plant Species Vegetationmentioning

confidence: 99%

Status and Challenges of Qinghai–Tibet Plateau’s Grasslands: An Analysis of Causes, Mitigation Measures, and Way Forward

et al. 2020

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Grassland ecosystems on the Qinghai–Tibet Plateau (QTP) provide numerous ecosystem services and functions to both local communities and the populations living downstream through the provision of water, habitat, food, herbal medicines, and shelter. This review examined the current ecological status, degradation causes, and impacts of the various grassland degradation mitigation measures employed and their effects on grassland health and growth in the QTP. Our findings revealed that QTP grasslands are continually being degraded as a result of complex biotic and abiotic drivers and processes. The biotic and abiotic actions have resulted in soil erosion, plant biomass loss, soil organic carbon loss, a reduction in grazing and carrying capacity, the emergence of pioneer plant species, loss of soil nutrients, and an increase in soil pH. A combination of factors such as overgrazing, land-use changes, invasive species encroachment, mining activities, rodent burrowing activities, road and dam constructions, tourism, migration, urbanization, and climate change have caused the degradation of grasslands on the QTP. A conceptual framework on the way forward in tackling grassland degradation on the QTP is presented together with other appropriate measures needed to amicably combat grassland degradation on the QTP. It is recommended that a comprehensive and detailed survey be carried out across the QTP to determine the percentage of degraded grasslands and hence, support a sound policy intervention.

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Section: Effects Of Grassland Degradation On Plant Species Vegetationmentioning

confidence: 99%

Status and Challenges of Qinghai–Tibet Plateau’s Grasslands: An Analysis of Causes, Mitigation Measures, and Way Forward

et al. 2020

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“…50 High soil water content not only supports high vegetation productivity but also affects the decomposition of soil organic matter by affecting the soil redox reaction. 16,51,52 Wang et al 27 found that LFOC, HFOC, and SOC contents were respectively 10, 37, and 47 g kg −1 in AM with 95% vegetation cover, and were 1.6, 16, and 17.6 g kg −1 in AM with 40% vegetation cover at Dari County on the QTP. Shang et al 36 found LFOC contents of 23, 12, and 2.6 g kg −1 , and HFOC contents of 47, 49, and 5 g kg −1 in the 0-10 cm soil layer in ASM, AM, and AS soils in permafrost regions along the Qinghai-Tibet Highway, respectively.…”

Section: Discussionmentioning

confidence: 99%

Profile distributions of soil organic carbon fractions in a permafrost region of the Qinghai–Tibet Plateau

Yuan

Jin

Wang

et al. 2020

Permafrost & Periglacial

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Adequate characterization of soil organic carbon (SOC) fractions is essential to elucidate carbon dynamics in permafrost-affected ecosystems. SOC and its fractions were investigated across alpine ecosystems, including alpine swamp meadows (ASM), alpine meadows (AM) and alpine steppes (AS), in permafrost regions on the Qinghai-Tibet Plateau (QTP), southwest China. The density separation method was used to separate the SOC into light-and heavy-fraction organic carbon (LFOC and HFOC, respectively). Permafrost soils in the ASM had higher SOC, LFOC, and HFOC contents than in the AM. LFOC and HFOC contents were significantly correlated, but both were more closely related to SOC than to each other. On the ecological gradient from ASM to AS, the thickness of surficial organic horizons decreased while the thickness of mineral materials increased. SOC in the organic horizon and permafrost had high mineralization

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“…Meanwhile, to prevent damage to the cell membrane system, plants activate the enzymatic defense system to produce protective enzymes to scavenge free radicals generated in the cells [35], and reduce the degree of membrane lipid per-oxidation, thus resist the effects of stress. SOD, POD and CAT are the 3 most common protective enzymes, and their content can re ect the sensitivity of plants to stress [36,37,38]. SS such as glucose, galactose, fructose, etc., also accumulated under stress.…”

Section: Morphological Structure Of Leafmentioning

confidence: 99%

Response of Lamiophlomis rotata (Benth.) Kudo to degradation of alpine grasslands in the western Sichuan plateau, China

Niu

Sun

et al. 2020

Preprint

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Background: Lamiophlomis rotata (Benth.)Kudo, also known as Duyiwei in China, is considered to be one of the most common Tibetan medicine. It is famous for the significant effects on improving blood circulation and relieving pain. Due to the environmental deterioration and excessive consumption, the wild resources of L.rotata is decreasing year by year. However, its artificial cultivation has not been realized. This study aimed to initially explore the adaptation mechanism of L.rotata to degraded alpine grassland, and provide reference for its wild tending and artificial cultivation.Methods: In this study, we used a sample method to conduct a population ecological survey of plants and collect plant leaf samples from mildly, moderately, and extremely degraded grassland. The content of SOD, POD, CAT, PRO, MDA, SS, SP, carotene, chlorophyll A and chlorophyll B in different sample leaves was measured by colorimetry. Microscopic characteristics of the cross-section, epidermis and submicroscopic structure of the leaves were observed and compared.Results: The density of L. rotata in moderately degraded grassland was the highest，where L. rotata had the strongest resistance. And the analysis of seven physiological indicators combined with stress resistance showed that the average content of MDA, SOD, POD, CAT and SS is the highest in L. rotata of the moderately degraded grassland. The microscopic observation showed that, by increasing the thickness of the epidermis, the density of the glandular scales, the proportion of palisade tissue and the number of gland scales, L. rotata was able to adapt to the degraded grassland. Meanwhile, morphological studies have shown that L. rotata could enhance root growth in the degraded grassland. Furthermore, in response to the degradation of alpine grassland on the Qinghai-Tibet Plateau, L. rotata population and biomass distribution in the underground parts have increased. However, L. rotata does not have a competitive advantage in mildly degraded grassland. Compare with the mildly and moderately habitat, the population of L. rotata is small in the extremely degraded habitat.Conclusion: The results showed that among the 3 levels of degraded grassland, L. rotata in the moderately degraded grassland shows the strongest resistance. This study can provide a reference for breeding and ecological planting of L. rotata, suggests that in the nursery stage, the medium degraded grassland should be chosen for ecological breeding to enhance the survival rate of seedlings. While after large-scale planting, reasonable community interventions, like the P. fruticosa+F. rubra community, should be built to simulate the yield of medicinal materials.

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Changes of soil properties regulate the soil organic carbon loss with grassland degradation on the Qinghai-Tibet Plateau

Cited by 78 publications

References 47 publications

Status and Challenges of Qinghai–Tibet Plateau’s Grasslands: An Analysis of Causes, Mitigation Measures, and Way Forward

Status and Challenges of Qinghai–Tibet Plateau’s Grasslands: An Analysis of Causes, Mitigation Measures, and Way Forward

Profile distributions of soil organic carbon fractions in a permafrost region of the Qinghai–Tibet Plateau

Response of Lamiophlomis rotata (Benth.) Kudo to degradation of alpine grasslands in the western Sichuan plateau, China

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