Change in Alpine Grassland NPP in Response to Climate Variation and Human Activities in the Yellow River Source Zone from 2000 to 2020

Zhang, Feng; Hu, Xiasong; Zhang, Jing; Li, Chengyi; Zhang, Yupeng; Li, Xilai

doi:10.3390/su14148790

Cited by 10 publications

(13 citation statements)

References 34 publications

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“…Climate change plays an important role in changing the terrestrial ecosystem NPP [ 14 ], while temperature and precipitation are the most direct and sensitive factors affecting the NPP [ 15 , 20 ]. In this paper, the Granger causality analysis was performed in Stata (version 13) to demonstrate the direction of causality between NPP act and climatic factors (see Table 2 ).…”

Section: Discussionmentioning

confidence: 99%

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Net Primary Productivity Variations Associated with Climate Change and Human Activities in Nanjing Metropolitan Area of China

Chen

Liu

et al. 2022

IJERPH

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Rapid economic development has changed land use and population density, which in turn affects the stability and carbon sequestration capacity of regional ecosystems. Net primary productivity (NPP) can reflect the carbon sequestration capacity of ecosystems and is affected by both climate change and human activities. Therefore, quantifying the relative contributions of climate change and human activities on NPP can help us understand the impact of climate change and human activities on the carbon sequestration capacity of ecosystems. At present, researchers have paid more attention to the impact of climate change and land use change on NPP. However, few studies have analyzed the response of the NPP to gross domestic product (GDP) and population density variations on a pixel scale. Therefore, this paper analyzes the impact of climate change and human activities to NPP on a pixel scale in the Nanjing metropolitan area. During the period 2000–2019, the annual mean NPP was 494.89 g C·m−2·year−1, and the NPP in the south of the Nanjing metropolitan area was higher than that in the north. The NPP was higher in the forest, followed by unused land, grassland, and cropland. In the past 20 years, the annual mean NPP showed a significant upward trend, with a growth rate of 3.78 g C·m−2·year−1. The increase in temperature and precipitation has led to an increasing trend of regional NPP, and the impact of precipitation on NPP was more significant than that of temperature. The transformation of land use from low-NPP type to high-NPP type also led to an increase in NPP. Land use change from high-NPP type to low-NPP type was the main cause of regional NPP decline. Residual analysis was used to analyze the impact of human activities on NPP. Over the last 20 years, the NPP affected by human activities (NPPhum) showed a high spatial pattern in the south and a low spatial pattern in the north, and the annual mean NPPhum also showed a fluctuating upward trend, with a growth rate of 2.00 g C·m−2·year−1. The NPPhum was influenced by both GDP and population density, and the impact of population density on NPP was greater than that of GDP.

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Section: Discussionmentioning

confidence: 99%

“…Some studies point out that climate change and human activities are the two main factors driving changes in vegetation NPP [ 13 , 14 ]. In terms of climatic factors, temperature, precipitation [ 15 , 16 ], sunshine [ 2 ], and solar radiation [ 17 ] have affected the changes in regional vegetation NPP.…”

Section: Introductionmentioning

confidence: 99%

Net Primary Productivity Variations Associated with Climate Change and Human Activities in Nanjing Metropolitan Area of China

Chen

Liu

et al. 2022

IJERPH

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“…Diverse analytical methods, such as principal component analysis [30], multivariate regression [31], and correlation analysis [32], have been employed to explore the responses of NPP to various factors. The primary drivers influencing the variations in vegetation NPP were climate change and human activities [33,34]. Research underscores the substantial influence of natural elements, such as temperature [35], precipitation [36], and solar radiation [37], on regional vegetation NPP.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Spatiotemporal Characteristics of NPP and the Response to Urban Expansion in the Chang–Zhu–Tan Urban Agglomeration, China

Ma,

Lin,

Long

et al. 2024

Preprint

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Background In recent years, accelerated urbanization, accompanied by rapid economic growth, has substantially influenced the ecological environment and carbon storage. To examine the relationship between urbanization and carbon storage, the vegetation net primary productivity (NPP) of the Changsha–Zhuzhou–Xiangtan urban agglomeration (CZT) over the past two decades was estimated using the Carnegie–Ames–Stanford approach model. The multiyear spatiotemporal evolutionary characteristics of NPP changes and their responses to urban expansion were explored using various trend analysis methods. Results From 2000 to 2020, a fluctuating and moderate declining trend in the yearly average NPP was observed. In particular, after 2008, there was a noticeable acceleration in the rate of NPP decline, which was attributed to the implementation of the urban integration policy in the CZT. Furthermore, an increasing trend in NPP was noted in the core of the built-up region, which was attributed to the government's efforts toward urban greening. However, with the continuous outward expansion of the Changsha–Zhuzhou–Xiangtan region, a considerable reduction in NPP was observed in the suburbs. Future variations in NPP for most parts of the CZT will be contrary to those observed in the past. The primary factors influencing NPP changes in the CZT have gradually shifted from natural factors to human activities. Although a weak negative correlation was observed between the built-up area density and NPP in 63.04% of the CZT and urban expansion predominantly negatively affected vegetation NPP, the positive contribution of human activities to NPP still outweighed the negative contributions. Conclusion Measures to protect the ecological environment have effectively mitigated the reduction in vegetation carbon storage within urban agglomerations. This study provides a rigorous theoretical basis for the integrated development of urban expansion and environmental protection, as well as for carbon management.

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“…Land ecosystems, serving as crucial carbon reservoirs in the global carbon cycle, exert profound impacts on the carbon cycle at a global scale [1,2]. Vegetation, as the core component of terrestrial ecosystems, plays a critical role in reducing greenhouse gas concentrations, maintaining global material and energy cycles, and preserving the global carbon balance.…”

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Variation and Future Sustainability of Net Primary Productivity from 2001 to 2021 in Hetao Irrigation District, Inner Mongolia

Peng,

Li,

Wang

et al. 2024

Agriculture

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The Hetao Irrigation District in Inner Mongolia, a vital grain-producing region in northern China, faces growing environmental challenges. Studying net primary productivity (NPP) is essential for understanding spatiotemporal vegetation shifts and guiding locally adapted restoration and management efforts. Utilizing MOD17A3/NPP data, this study applies the Theil–Sen median trend, Mann–Kendall significance, and the Hurst index to scrutinize the spatiotemporal distribution patterns of NPP from 2001 to 2021 and forecast future changes in the area. The findings reveal cyclic temporal trends, forming a “∧” shape with initial increases followed by decreases, notably during the July to August period each year. The multi-year average NPP exhibits a slight upward fluctuation trend, averaging 172.40 gCm−2a−1. Peaks occur approximately every three years, reaching the highest average in 2012 at 218.96 gCm−2a−1. Spatially, NPP distribution stays consistent over the years, influenced by various land cover types, especially cropland, shaping the spatial patterns. Monthly and yearly NPP trends over the 21 years indicate a significant decrease in May and June, with other months mostly showing a non-significant increase. The Hurst index for monthly and yearly NPP changes over 21 years shows relatively high weak anti-persistence. In summary, over the past 21 years, the NPP trend in the study area has not significantly improved and is expected to decline in the future. This study offers data support and a scientific foundation for refining the carbon cycle model, quantifying vegetation carbon sequestration capacity, addressing climate change policies, and striving for carbon peak and neutrality in the Hetao Irrigation District.

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Change in Alpine Grassland NPP in Response to Climate Variation and Human Activities in the Yellow River Source Zone from 2000 to 2020

Cited by 10 publications

References 34 publications

Net Primary Productivity Variations Associated with Climate Change and Human Activities in Nanjing Metropolitan Area of China

Net Primary Productivity Variations Associated with Climate Change and Human Activities in Nanjing Metropolitan Area of China

Assessing the Spatiotemporal Characteristics of NPP and the Response to Urban Expansion in the Chang–Zhu–Tan Urban Agglomeration, China

Spatio-Temporal Variation and Future Sustainability of Net Primary Productivity from 2001 to 2021 in Hetao Irrigation District, Inner Mongolia

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