The Impact of Climate Change and Human Activity on Net Primary Production in Tibet

Qin, Xiujuan; Sun, Jian; Liu, Miao; Lü, Xianguo

doi:10.15244/pjoes/62986

Cited by 9 publications

(10 citation statements)

References 37 publications

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“…Temperature and precipitation largely determine the geographical distribution pattern of vegetation with high spatial and temporal heterogeneity [57]. The warming and humidification trend on the QTP in recent decades is considered to be the main factor for vegetation recovery [29,32,42]. However, conclusions about the effects of warming on vegetation productivity are inconsistent.…”

Section: Effects Of Climate Change and Human Activities On Vegetationmentioning

confidence: 99%

“…However, although several studies have quantified the relative contributions of climate variations and anthropogenic factors in specific protected areas on the QTP, less attention has been paid to the evaluation at a whole-QTP scale [30,40,41]. Additionally, the spatial heterogeneity of vegetation on the QTP and the fact that it is influenced by a combination of factors have led to large uncertainties in determining the impacts of climate change and human activities [29,32,42]. Thus, whether climate change and human activities lead to substantial variation in vegetation productivity, as well as its driving factors, remains largely unknown, especially in the nature reserves that are subject to less human influence.…”

Section: Introductionmentioning

confidence: 99%

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Relative Contributions of Climate Change and Human Activities on Vegetation Productivity Variation in National Nature Reserves on the Qinghai–Tibetan Plateau

Zhou

2022

Remote Sensing

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National nature reserves (NNRs) are at the forefront of conservation efforts on the Qinghai–Tibetan Plateau (QTP). However, few studies have examined the vegetation dynamics and their driving forces at the whole QTP scale. In this study, we used potential Net Primary Productivity (PNPP), actual NPP (ANPP), and human-activity-induced NPP (HNPP) to analyze the vegetation dynamics of 42 NNRs on the QTP. Further, we determined the driving factors of vegetation dynamics from 2000 to 2020. The results indicate that, during the 21 years studied, ANPP increased at 83.4% of the NNRs area on the QTP. Additionally, the contributions of climate change and anthropogenic factors to ANPP variation were 59.53% and 40.47%, respectively. The contribution of temperature to ANPP variation was considered high and stable, whereas the contribution of precipitation was relatively lower and variable. Residual analysis showed that human activities had both positive (51.30%) and negative effects (48.70%) on ANPP. Using Hurst exponent analysis, we found that 31.60% of the vegetation for the NNRs on the QTP will likely remain a persistent trend, and 65.4% will be stochastic in the future. By contrast, 3.00% of the vegetation mainly located in southern QTP would show a reverse trend, with most of them distributing in southern QTP, which deserves more attention. This study may help policymakers understand the relative impacts of climate change and human activities on vegetation in the different nature reserves on the QTP.

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Section: Effects Of Climate Change and Human Activities On Vegetationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relative Contributions of Climate Change and Human Activities on Vegetation Productivity Variation in National Nature Reserves on the Qinghai–Tibetan Plateau

Zhou

2022

Remote Sensing

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“…The diurnal variation curves of water use efficiency of three kinds of legumes forges present different trends, which showed that there were great differences during the same family but of different species [29]. The Medicago sativa was higher than that of Trifolium repens and Trifolium pretense, which illustrated that Medicago sativa can produce more biomass under the same water conditions.…”

Section: Resultsmentioning

confidence: 96%

Research on Photosynthetic Leguminous Forage in the Karst Rocky Desertification Regions of Southwestern China

Xiong¹,

Chi²,

Shen³

2017

Pol. J. Environ. Stud.

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The photosynthetic characteristics of three kinds of leguminous forages were studied in a karst rocky desertification area of Guizhou using the photosynthetic apparatus on sunny days. The results showed that the curves of annual diurnal variation of the net photosynthetic rate and transpiration rate on three kinds of experiment forges showed different variation trends that were mainly related to the experimental materials. They showed that there were significant differences in the net photosynthetic and transpiration rates of different grasses, and also in photosynthetic physiology changes of different seasons. Through the annual photosynthetic physiological studies among Trifolium repens, Trifolium pretense, Medicago sativa, and other forage legumes can be concluded that the highest annual average net photosynthetic rate of leguminous forage was Medicago sativa followed by Trifolium repens, and Trifolium pretense was the lowest; the highest transpiration rate was Trifolium pretense followed by Trifolium repens, and the lowest was Medicago sativa, with little differences of this three leguminous forage. The highest photosynthetic efficiency and the lowest transpiration rate make the water use efficiency of Medicago sativa the highest, followed by Trifolium repens, and the lowest was Trifolium pretense. In most months, Trifolium repens, Trifolium pretense, and Medicago sativa were sensitive to high photosynthetic active radiation and high temperature, so taking a dormant form with closing their pores to reduce its water loss and material consumption. The primary productivity of grassland depends largely on water use efficiency. When establishing artificial grassland in the karst rocky desertification area we need to consider the net photosynthetic rate, transpiration rate, and water use efficiency, and take measures to use different kinds of forage, which not only reduce water loss but also improve water use efficiency and ease drought and water shortage in rocky desertification areas. From considering the overall perspective of annual photosynthetic physiological characteristics,

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“…The wind carries away surface soil, transports soil particles and has a direct impact on soil erosion (Wang et al, 2016). Temperature and precipitation influence soil moisture and vegetation growth, which in turn affects wind erosion (Qin et al, 2016). The threshold velocity for transportation of sand in the alpine grassland of TP is 6.0 m/s (Zhang et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Effects of fencing project on wind erosion reduction in Alpine grassland and its impact on the development of climbing dunes in southern Tibetan Plateau

Liu,

Yuan,

Xiong

et al. 2024

Earth Surf Processes Landf

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Alpine grassland in the Tibetan Plateau (TP) of China is one of the most susceptible regions to wind erosion in recent decades. The fencing project, grassland enclosure using fencing, has been a common strategy for land degradation counteraction in the TP. However, the wind erosion reduction effects of fencing project remain largely unclear, especially in the regions lacking continuous observations such as Southern TP. In this study, a sand source area with fencing protection (fencing land, a mainly eroded grazing grassland before being fenced) and a near‐source climbing dune were selected to illustrate the effect of fencing project on wind erosion using 137Cs and 210Pbex tracing techniques. An adjacent perennial grazing land was selected for comparison. The results showed that the wind erosion rate in sand source area was 17.18 t·ha−1·year−1 before the implementation of project, while that was −6.67 t·ha−1·year−1 since fencing. The wind erosion rates in perennial grazing land were 24.91 t·ha−1·year−1 for 20 years ago to 1963 and 24.33 t·ha−1·year−1 for almost 20 years. The normalized difference vegetation index (NDVI) of sand source area increased from 0.098 before fencing to 0.137 after fencing; the latter was 1.63 times higher than that of grazing land during the same period. After the implementation of fencing project in sand source area, it was found that the sand supply to the climbing dune was mainly reduced, thus stabilizing it and promoting NDVI increase, especially in the middle‐lower part of the climbing dune. These results would benefit the evaluation of grassland restoration effectiveness in the TP.

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The Impact of Climate Change and Human Activity on Net Primary Production in Tibet

Cited by 9 publications

References 37 publications

Relative Contributions of Climate Change and Human Activities on Vegetation Productivity Variation in National Nature Reserves on the Qinghai–Tibetan Plateau

Relative Contributions of Climate Change and Human Activities on Vegetation Productivity Variation in National Nature Reserves on the Qinghai–Tibetan Plateau

Research on Photosynthetic Leguminous Forage in the Karst Rocky Desertification Regions of Southwestern China

Effects of fencing project on wind erosion reduction in Alpine grassland and its impact on the development of climbing dunes in southern Tibetan Plateau

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