Assessing the contribution of human activities and climate change to the dynamics of NPP in ecologically fragile regions

Ma, Bingxin; Jing, Juanli; Liu, Bing; Wang, Yongfeng; He, Hongchang

doi:10.1016/j.gecco.2023.e02393

Cited by 11 publications

(10 citation statements)

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“…These factors boost photosynthesis and carbon storage in vegetation, ultimately contributing to the elevation of ANPP [87,88]. Additionally, human-driven efforts towards vegetation restoration, including grassland conservation policies and diverse ecological restoration initiatives, have markedly enhanced vegetation coverage and alleviated the detrimental effects of human activities on ANPP [89,90]. Thus, in most of the areas within the study region where there is an increase, the growth in ANPP is dominantly driven by both climate change and human activities [62].…”

Section: The Relative Effects Of Climate Change and Human Activities ...mentioning

confidence: 99%

“…Nevertheless, as per the research presented in Section 3.5 of this study, the study region experienced a general upward trend in annual average temperatures from 2001 to 2018. The gradual increase in temperature promotes vegetation growth [89,92], especially in mountainous areas, leading to a positive influence of climate change in these regions.…”

Section: The Relative Effects Of Climate Change and Human Activities ...mentioning

confidence: 99%

“…In Yunnan and Guizhou Provinces, located in the Southwest China karst region, ecological protection projects, ecological migration, and initiatives such as converting farmland back to forest or grassland have created favorable conditions for the accumulation of ANPP [93]. Numerous studies have revealed an increase in vegetation cover and a growing trend of ANPP in the Southwest China karst region [89,[93][94][95]. As a result, human interventions have resulted in a rise in ANPP in these areas, exerting a more significant effect than that of climate change.…”

Section: The Relative Effects Of Climate Change and Human Activities ...mentioning

confidence: 99%

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Assessing the Distribution and Driving Effects of Net Primary Productivity along an Elevation Gradient in Subtropical Regions of China

Xu,

Feng,

Chen

et al. 2024

Forests

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Globally, forest ecosystems, especially subtropical forests, play a central role in biogeochemical cycles and climate regulation, demonstrating their irreplaceable function. The subtropical region of China, characterized by its unique forest ecosystem, complex terrain, climate heterogeneity, diverse vegetation types, and frequent human activities, underscores the importance of the in-depth study of its net primary productivity (NPP). This paper employs the eddy covariance–light use efficiency (EC-LUE) model to quantitatively estimate the gross primary productivity (GPP) of this region from 2001 to 2018, followed by an estimation of the actual net primary productivity (ANPP) using the carbon use efficiency (CUE). The results showed that over these 18 years, the annual average ANPP was 677.17 gC m−2 a−1, exhibiting an overall increasing trend, particularly in mountainous areas, reserves, and the cultivated lands of the northeastern plains, whereas a significant decrease was observed around the urban agglomerations on the southeast coast. Furthermore, the Thornthwaite memorial model was applied to calculate the potential net primary productivity (PNPP), and diverse scenarios were set to quantitatively evaluate the impact of climate change and human activities on the vegetation productivity in the study area. It was found that in areas where the ANPP increased, both human activities and climate change jointly influenced ANPP dynamics; in areas with a decreased ANPP, the impact of human activities was particularly significant. Additionally, the heterogeneous distribution of ANPP across different altitudinal gradients and the driving effects of various climatic factors were analyzed. Finally, a partial correlation analysis was used to examine the relationships between the temperature, precipitation, and ANPP. This study indicated that temperature and precipitation have a substantial impact on the growth and distribution of vegetation in the region, yet the extent of this influence shows considerable variation among different areas. This provides a robust scientific basis for further research and understanding of the carbon dynamics of subtropical forest ecosystems and their role in the global carbon cycle.

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Section: The Relative Effects Of Climate Change and Human Activities ...mentioning

confidence: 99%

Section: The Relative Effects Of Climate Change and Human Activities ...mentioning

confidence: 99%

Section: The Relative Effects Of Climate Change and Human Activities ...mentioning

confidence: 99%

See 1 more Smart Citation

Assessing the Distribution and Driving Effects of Net Primary Productivity along an Elevation Gradient in Subtropical Regions of China

Xu,

Feng,

Chen

et al. 2024

Forests

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show abstract

“…In the Qinghai alpine ecosystem of China, NPP held great significance in terms of water-related ecosystem services and was widely regarded as a key indicator of ecosystem quality (Hao et al, 2022). Past investigations concerning NPP predominantly concentrated on exploring its connection with various ecosystem services, primarily employing linear correlation analysis techniques (Chen et al, 2023;Ma et al, 2023). However, uncovering the non-linear connections between different factors in intricate systems poses a significant difficulty.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal pattern of landscape ecological risk in the Yangtze River Basin and its influence on NPP

Jia,

Yu,

et al. 2024

Front. For. Glob. Change

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The rapid development of the social economy and the continuous change in land use have greatly altered the ecological risk of the regional landscape. This study focused on the Yangtze River Basin in China and aimed to examine the temporal and spatial variation characteristics of landscape ecological risk (LER) over a period of 34 years (1982–2015), after determining the optimal sub-watershed scale. Based on the conditional probability framework, the non-linear response of NPP to LER was revealed. Finally, the primary driving factors of LER were explored, and additional potential causes for changes in NPP were discussed. The study findings indicated that the mean annual LER of the Yangtze River Basin exhibited a spatial distribution characterized by high values observed in the western regions and low values in the eastern regions at the optimal sub-basin scale. Specifically, 30.56 and 22.22% of the sub-basins demonstrated a significant upward and downward trend in annual LER, respectively (P < 0.05). The spatial distribution pattern of the mean annual NPP demonstrated high values in the middle region and low values in the western area, with annual NPP significantly increasing in 94.44% of the sub-basins (P < 0.05). The relationship between annual NPP and annual LER was found to be non-linear, indicating that higher annual LER results in a higher probability of median and high values of annual NPP from the perspective of watershed average. Furthermore, climate factors emerged as the main influencing factor of the NPP. Based on these discoveries, upcoming endeavors should concentrate on optimizing landscape formations and executing a judicious distribution of plant species.

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“…The responses of microbial communities and their necromass to drought can determine the patterns of SOC generation and decomposition (Liang & Balser, 2012). Drought reduces soil moisture and decreases the net primary productivity of vegetation (Adams et al, 2017;Ma et al, 2023;Maysonnave et al, 2022), which ultimately reduces the SOC content due to reduced plant-soil C inputs (Brunn et al, 2023; Figure 1). On the contrary, it can increase SOC by reducing soil organic matter (SOM) decomposition and turnover (Fröberg et al, 2008) through enhanced physical and chemical protection of clay and silt as drought intensifies (Vasconcelos et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Fungal necromass is reduced by intensive drought in subsoil but not in topsoil

Liu,

Zou,

Chen

et al. 2023

Global Change Biology

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The frequency and intensity of droughts worldwide are challenging the conservation of soil organic carbon (SOC) pool. Microbial necromass is a key component of SOC, but how it responds to drought at specific soil depths remains largely unknown. Here, we conducted a 3‐year field experiment in a forest plantation to investigate the impacts of drought intensities under three treatments (ambient control [CK], moderate drought [30% throughfall removal], and intensive drought [50% throughfall removal]) on soil microbial necromass pools (i.e., bacterial necromass carbon, fungal necromass carbon, and total microbial necromass carbon). We showed that the effects of drought on microbial necromass depended on microbial groups, soil depth, and drought intensity. While moderate drought increased total (+9.1% ± 3.3%) and fungal (+13.5% ± 4.9%) necromass carbon in the topsoil layer (0–15 cm), intensive drought reduced total (−31.6% ± 3.7%) and fungal (−43.6% ± 4.0%) necromass in the subsoil layer (15–30 cm). In contrast, both drought treatments significantly increased the BNC in the topsoil and subsoil. Our results suggested that the effects of drought on the microbial necromass of the subsoil were more pronounced than those of the topsoil. This study highlights the complex responses of microbial necromass to drought events depending on microbial community structure, drought intensity and soil depth with global implications when forecasting carbon cycling under climate change.

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Assessing the contribution of human activities and climate change to the dynamics of NPP in ecologically fragile regions

Cited by 11 publications

References 72 publications

Assessing the Distribution and Driving Effects of Net Primary Productivity along an Elevation Gradient in Subtropical Regions of China

Assessing the Distribution and Driving Effects of Net Primary Productivity along an Elevation Gradient in Subtropical Regions of China

Spatiotemporal pattern of landscape ecological risk in the Yangtze River Basin and its influence on NPP

Fungal necromass is reduced by intensive drought in subsoil but not in topsoil

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