Impact of climatic changes and anthropogenic activities on ecosystem net primary productivity in India during 2001–2019

Bejagam, Vijaykumar; Sharma, Ashutosh

doi:10.1016/j.ecoinf.2022.101732

Cited by 26 publications

(12 citation statements)

References 55 publications

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“…NPP has not shown any statistically significant changes across the country despite this greening. However, the trends of NPP have strong spatial variations, which are similar to those reported by Bejagam et al 40 . Notably, the NPP from temporally consistent Indian forests shows a significant declining trend of 0.75 ± 0.58 TgC year -2 and has declined by 6.19% over the 19 years in the twenty-first century.…”

Section: Discussion and Concluding Remarkssupporting

confidence: 89%

“…Temperature exhibits a significant negative correlation with NPP in all five regions. A previous study also found that NPP and temperature have a negative correlation in most places in the country 40 . For a quantitative understanding of the role of temperature on the diverging trend of NPP and LAI, we linearly regressed NPP as a function of LAI (NPP = f (LAI)) and calculated the trend in the residuals for each grid (Fig.…”

Section: Resultsmentioning

confidence: 66%

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Warming inhibits increases in vegetation net primary productivity despite greening in India

Das,

Chaturvedi,

Roy

et al. 2023

Sci Rep

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India is the second-highest contributor to the post-2000 global greening. However, with satellite data, here we show that this 18.51% increase in Leaf Area Index (LAI) during 2001–2019 fails to translate into increased carbon uptake due to warming constraints. Our analysis further shows 6.19% decrease in Net Primary Productivity (NPP) during 2001–2019 over the temporally consistent forests in India despite 6.75% increase in LAI. We identify hotspots of statistically significant decreasing trends in NPP over the key forested regions of Northeast India, Peninsular India, and the Western Ghats. Together, these areas contribute to more than 31% of the NPP of India (1274.8 TgC.year−1). These three regions are also the warming hotspots in India. Granger Causality analysis confirms that temperature causes the changes in net-photosynthesis of vegetation. Decreasing photosynthesis and stable respiration, above a threshold temperature, over these regions, as seen in observations, are the key reasons behind the declining NPP. Our analysis shows that warming has already started affecting carbon uptake in Indian forests and calls for improved climate resilient forest management practices in a warming world.

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Section: Discussion and Concluding Remarkssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 66%

Warming inhibits increases in vegetation net primary productivity despite greening in India

Das,

Chaturvedi,

Roy

et al. 2023

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Then the effects of anthropogenic factors were disaggregated based on residual analysis. However, other factors also influence vegetation growth [10,38,78,79], such as solar radiation or sunlight hours, soil moisture, etc. For example, previous studies [80,81] have reported that drought-induced soil water deficit is often a main factor affecting vegetation growth.…”

Section: Limitations and Implicationsmentioning

confidence: 99%

Vegetation Dynamics in Response to Climate Change and Human Activities in a Typical Alpine Region in the Tibetan Plateau

Zhao

Ren

2022

IJERPH

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Understanding past and future vegetation dynamics is important for assessing the effectiveness of ecological engineering, designing policies for adaptive ecological management, and improving the ecological environment. Here, inter-annual changes in vegetation dynamics during 2000–2020, contributions of climate change (CC) and human activities (HA) to vegetation dynamics, and sustainability of vegetation dynamics in the future were determined in Gannan Prefecture (a typical alpine region in the Tibetan Plateau), China. MODIS-based normalized difference vegetation index (NDVI), air temperature, precipitation, and land cover data were used, and trend analysis, multiple regression residuals analysis, and Hurst exponent analysis were employed. NDVI increased at a rate of 2.4 × 10−3∙a−1 during the growing season, and vegetation improved in most parts of the study area and some sporadically degraded areas also existed. The increasing rate was the highest in the Grain to Green Project (GTGP) areas. The vegetation in the southern and northern regions was mainly affected by CC and HA, respectively, with CC and HA contributions to vegetation change being 52.32% and 47.68%, respectively. The GTGP area (59.89%) was most evidently affected by HA. Moreover, a Hurst exponent analysis indicated that, in the future, the vegetation in Gannan Prefecture would continuously improve. The study can assist in formulating ecological protection and restoration projects and ensuring sustainable development.

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“…Climate change and human activities have influenced the dynamics of terrestrial ecosystems worldwide [1], which in turn has led to changes in the cycle of elements. Carbon is a critical element for all life forms on Earth [2], which regulates the climate and is the primary source of fuel for energy in a global economy [3].…”

Section: Introductionmentioning

confidence: 99%

“…NPP is an essential index to measure ecosystem reaction to climate changes [15]. Generally, climate change boosts NPP in ecosystems, while human activities slightly decrease it [1].…”

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Analysis of Carbon Sequestration in Different Ecosystems of Iran and Its Relationship with Agricultural Droughts

2023

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The increase in environmental and human-related changes (e.g., increase in the carbon cycle flux of plants) has increased the dynamism of ecosystems. Examining fluctuations in net primary production (NPP) is very important in adopting correct strategies for ecosystem management. The current study explores the spatiotemporal variations in NPP and its association with agricultural droughts in Iran’s ecosystems over 20 years (2000–2020). Mann–Kendall and Sen’s slope methods in each pixel were used to track changes in trends. Drought upsets the terrestrial carbon cycle balance. In this study, Vegetation Health Index (VHI) used to assess drought that extracted from different bands of images satellite. Then, the relationship between NPP rates and agricultural droughts was investigated through running Pearson correlation. The results demonstrated that Iran’s annual share of carbon sequestration is 1.38 kg*C/m2/year. The highest carbon sequestration rate was recorded in Caspian Hyrcanian forests. In contrast, the lowest rate was observed in the Arabian Desert and East Sahero-Arabian xeric shrublands in southwestern Iran. Moreover, the highest photosynthesis variations were recorded in Arabian Desert and East Sahero-Arabian xeric shrublands and Tigris–Euphrates alluvial salt marsh, while the lowest changes were registered in Badghyz and Karabil. In total, 34.2% of the studied pixels showed a statistically significant rising or falling trend. Sen’s slope estimator demonstrated that the sharpest negative trend in carbon sequestration belonged to Caspian Hyrcanian mixed forests (−12.24 g*C/m2/year), while the sharpest positive trend was observed in Azerbaijan shrub desert and steppe (12.29 g*C/m2/year). The results of the Pearson correlation revealed significant correlations between NPP and VHI in different ecosystems with coefficients ranging from −0.93 to 0.95. The largest area with a positive correlation (33.97%) belonged to the Zagros Mountains forest steppe. Identification of areas with the greatest carbon sequestration changes could result in prioritizing varied ecosystems management for carbon sequestering. It can be also utilized in environmental planning such as scaling up ecosystem values or estimating current and past ecological capacity.

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Impact of climatic changes and anthropogenic activities on ecosystem net primary productivity in India during 2001–2019

Cited by 26 publications

References 55 publications

Warming inhibits increases in vegetation net primary productivity despite greening in India

Warming inhibits increases in vegetation net primary productivity despite greening in India

Vegetation Dynamics in Response to Climate Change and Human Activities in a Typical Alpine Region in the Tibetan Plateau

Spatio-Temporal Analysis of Carbon Sequestration in Different Ecosystems of Iran and Its Relationship with Agricultural Droughts

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