Assessing the effects of climate variation and human activities on grassland degradation and restoration across the globe

Liu, Yangyang; Zhang, Zhaoying; Tong, Linjing; Khalifa, Muhammad; Wang, Qian; Gang, Chengcheng; Wang, Zhenqian; Li, Jianlong; Sun, Zhengguo

doi:10.1016/j.ecolind.2019.105504

Cited by 91 publications

(73 citation statements)

References 43 publications

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“…This result is also consistent with the study of Liu et al (2019b), who found that global grassland NPP was positively correlated with the AP in arid and semi-arid regions. Our results are also in line with the finding of , who suggested that water is often considered the most important factor, and many vegetational limitations such as the low LAI and high root-to-shoot ratio might be induced result from the water scarcity, which could severely limit the grassland productivity in arid/ semiarid regions (Chen et al, 2016;Liu et al, 2019c). Moreover, negative correlation between NPP and AP also can be observed in most humid/semi-humid regions (Fig.…”

Section: The Responses Of Grassland Npp To Climate Changesupporting

confidence: 92%

“…Previous studies showed that atmospheric CO 2 concentration levels increased markedly by 31% since 1750, and the increase of global terrestrial NPP was the major driver of CO 2 growth rate (Bolin, 1977;Zhao and Running, 2010). Our analysis indicated that global grassland NPP was increased by a rate of 0.6 Pg C/yr during the period of 1982-2008, with an average NPP of 24.73 Pg C/yr , which emphasizes the fact that global grassland ecosystems represent important sinks for atmospheric CO 2 and play a crucial role in the global carbon sequestration (Liu et al, 2019c). Fig.…”

Section: Dynamics and Distribution Of Global Grassland Nppmentioning

confidence: 63%

“…Exploring the spatio-temporal dynamics of the grassland NPP on a global-scale, and the responses of the NPP to climate changes is highly important for a better understanding of the global terrestrial carbon cycle during the last few decades (Liu et al, 2019c).…”

Section: Discussionmentioning

confidence: 99%

“…This land cover data could be downloaded from http://modis-land.gsfc.nasa.gov/ landcover.html/. The version of the International Geosphere-Biosphere Project (IGBP) global vegetation classification, which is based on satellite imagery of land cover and vegetation type (Liu et al, 2019c), was used for the purpose of this analysis. The primary land cover scheme consists of 17 land cover classes defined by the IGBP, which could be classified into 11 natural vegetation classes, three non-vegetated land classes and three human-altered classes.…”

Section: Grassland Typesmentioning

confidence: 99%

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Assessing the Dynamics of Grassland Net Primary Productivity in Response to Climate Change at the Global Scale

et al. 2019

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Understanding the net primary productivity (NPP) of grassland is crucial to evaluate the terrestrial carbon cycle. In this study, we investigated the spatial distribution and the area of global grassland across the globe. Then, we used the Carnegie-Ames-Stanford Approach (CASA) model to estimate global grassland NPP and explore the spatio-temporal variations of grassland NPP in response to climate change from 1982 to 2008. Results showed that the largest area of grassland distribution during the study period was in Asia (1737.23 × 10 4 km 2), while the grassland area in Europe was relatively small (202.83 × 10 4 km 2). Temporally, the total NPP increased with fluctuations from 1982 to 2008, with an annual increase rate of 0.03 Pg C/yr. The total NPP experienced a significant increasing trend from 1982 to 1995, while a decreasing trend was observed from 1996 to 2008. Spatially, the grassland NPP in South America and Africa were higher than the other regions, largely as a result of these regions are under warm and wet climatic conditions. The highest mean NPP was recorded for savannas (560.10 g C/(m 2 •yr)), whereas the lowest was observed in open shrublands with an average NPP of 162.53 g C/(m 2 •yr). The relationship between grassland NPP and annual mean temperature and annual precipitation (AMT, AP, respectively) varies with changes in AP, which indicates that, grassland NPP is more sensitive to precipitation than temperature.

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Section: The Responses Of Grassland Npp To Climate Changesupporting

confidence: 92%

Section: Dynamics and Distribution Of Global Grassland Nppmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Section: Grassland Typesmentioning

confidence: 99%

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Assessing the Dynamics of Grassland Net Primary Productivity in Response to Climate Change at the Global Scale

et al. 2019

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“…The human-induced NPP (HNPP) is estimated by calculating the difference between PNPP and ANPP [27,32,[35][36][37]56], as expressed below…”

Section: Pnpp and Hnpp Calculationmentioning

confidence: 99%

Quantifying the Impacts of Anthropogenic Activities and Climate Variations on Vegetation Productivity Changes in China from 1985 to 2015

et al. 2020

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Accurate assessment of vegetation dynamics provides important information for ecosystem management. Anthropogenic activities and climate variations are the major factors that primarily influence vegetation ecosystems. This study investigates the spatiotemporal impacts of climate factors and human activities on vegetation productivity changes in China from 1985 to 2015. Actual net primary productivity (ANPP) is used to reflect vegetation dynamics quantitatively. Climate-induced potential net primary productivity (PNPP) is used as an indicator of climate change, whereas the difference between PNPP and ANPP is considered as an indicator of human activities (HNPP). Overall, 91% of the total vegetation cover area shows declining trends for net primary productivity (NPP), while only 9% shows increasing trends before 2000 (base period). However, after 2000 (restoration period), 78.7% of the total vegetation cover area shows increasing trends, whereas 21.3% of the area shows decreasing trends. Moreover, during the base period, the quantitative contribution of climate change to NPP restoration is 0.21 grams carbon per meter square per year (gC m−2 yr−1) and to degradation is 2.41 gC m−2 yr−1, while during the restoration period, climate change contributes 0.56 and 0.29 gC m−2 yr−1 to NPP restoration and degradation, respectively. Human activities contribute 0.36 and 0.72 gC m−2 yr−1 during the base period, and 0.63 and 0.31 gC m−2 yr−1 during the restoration period to NPP restoration and degradation, respectively. The combined effects of climate and human activities restore 0.65 and 1.11 gC m−2 yr−1, and degrade 2.01 and 0.67 gC m−2 yr−1 during the base and restoration periods, respectively. Climate factors affect vegetation cover more than human activities, while precipitation is found to be more sensitive to NPP change than temperature. Unlike the base period, NPP per unit area increases with an increase in the human footprint pressure during the restoration period. Grassland has more variability than other vegetation classes, and the grassland changes are mainly observed in Tibet, Xinjiang, and Inner Mongolia regions. The results may help policy-makers by providing necessary guidelines for the management of forest, grassland, and agricultural activities.

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Recent responses of grassland net primary productivity to climatic and anthropogenic factors in Kyrgyzstan

et al. 2020

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Net primary productivity (NPP) is an essential indicator of ecosystem function and sustainability and plays a vital role in the carbon cycle, especially in arid and semiarid grassland ecosystems. Quantifying trends in NPP and identifying the contributing factors are important for understanding the relative impacts of climate change and human activities on grassland degradation. For our case-study of Kyrgyzstan, we quantified from 2000 to 2014 the spatial and temporal patterns in climate-driven potential NPP (NPP P) using the Zhou Guangsheng model specifically developed for Asian grasslands, and actual NPP (NPP A) using the globally calibrated MOD17A3 NPP data product. By calculating the difference between NPP P and NPP A , we inferred human-induced NPP (NPP H) and thereby characterized changes in grassland NPP attributable to anthropogenic activities. The results showed that grassland NPP A in Kyrgyzstan experienced a slight decrease over time at an average rate of −0.87 g CÁm −2 Áyr −1 but patterns varied between provinces. Nearly 60% of Kyrgyzstan's grass

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Assessing the effects of climate variation and human activities on grassland degradation and restoration across the globe

Cited by 91 publications

References 43 publications

Assessing the Dynamics of Grassland Net Primary Productivity in Response to Climate Change at the Global Scale

Assessing the Dynamics of Grassland Net Primary Productivity in Response to Climate Change at the Global Scale

Quantifying the Impacts of Anthropogenic Activities and Climate Variations on Vegetation Productivity Changes in China from 1985 to 2015

Recent responses of grassland net primary productivity to climatic and anthropogenic factors in Kyrgyzstan

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