Elevation-dependent effects of growing season length on carbon sequestration in Xizang Plateau grassland

Tao, Jian; Dong, Jinwei; Zhang, Yangjian; Yu, Xiuqin; Zhang, Geli; Cong, Nan; Zhu, Jiang; Zhang, Xianzhou

doi:10.1016/j.ecolind.2019.105880

Cited by 12 publications

(8 citation statements)

References 76 publications

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“…For example, the conversion of cropland to forest and grassland occurs mainly at low altitudes of the QLMs. The elevation gradients of the growth rate of NPP agreed with that of temperature and solar radiation trends in alpine deserts (Figures 6 and 7), as increased temperature and solar radiation usually cause a longer growing season and increased photosynthesis at higher altitudes on the Tibetan Plateau (Shen et al, 2015;Tao et al, 2020). In addition, the growth rate of NPP decreased with increasing total biomass of the vegetation (Figure S5), and the total biomass of alpine deserts decreases with increasing elevation, as cold environment limits vegetation growth (Xu, Zhao, & Wang, 2019).…”

Section: Uncertainties Of the Simulated Meteorological And Npp Datasupporting

confidence: 70%

“…Nitrogen deposition is thought to promote vegetation growth in the QLMs, but its effect may be limited as extensive nitrogen deposition occurs in southern China (Piao et al, 2015). Warmer and wetter climate can cause increased growing season length, having a stronger contribution on the interannual variations of grassland carbon sequestration than maximum photosynthetic activities did on the Xizang Plateau (Tao et al, 2020). Precipitation timing and intensity, soil freezing/ thawing, snowmelt, evaporation and permafrost degradation can affect water availability and thus NPP variations (Shen et al, 2015).…”

Section: Regional Differences In the Recent Npp Trendmentioning

confidence: 99%

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Elevational differences in the net primary productivity response to climate constraints in a dryland mountain ecosystem of northwestern China

Wang

2020

Land Degrad Dev

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Dryland mountain ecosystems regulate global terrestrial carbon cycling and show high sensitivity to climate variability. The Qilian Mountains (QLMs) typify dryland mountain ranges in northern temperate belts and offer fundamental ecosystem services including forage production and water conservation. However, dominant controls on the interannual trend and variability of net primary productivity (NPP) in this region are unknown. Thus, we examined magnitude and direction of the NPP trend and quantified NPP sensitivity to temperature and precipitation under different biomes and altitudes using ground and remote sensing data. Our results showed that 12% of the QLMs had a reversed NPP trend from increasing to decreasing from 2000 to 2016, particularly in the western and southern parts, where NPP reductions were related to precipitation deficits. About 34% of the QLMs showed accelerated or persistent increasing NPP trends, mainly from the mid‐altitude between 3,100 and 4,300 m. The growth rate of NPP was higher in deserts and grasslands than in forests and increased in deserts but decreased in forests and grasslands with increasing elevation. Precipitation showed a stronger effect on the interannual variability in NPP than temperature did. The temperature sensitivity of NPP was similar along elevation gradients in forest steppes but decreased with increasing elevation in alpine deserts. The precipitation sensitivity of NPP reached highest in shrubby meadows when compared with coniferous forests and alpine deserts. This research provides new insights into climate controls of the NPP over the QLMs and to present drought as a growing threat to shrubby meadows and alpine deserts.

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Section: Uncertainties Of the Simulated Meteorological And Npp Datasupporting

confidence: 70%

Section: Regional Differences In the Recent Npp Trendmentioning

confidence: 99%

Elevational differences in the net primary productivity response to climate constraints in a dryland mountain ecosystem of northwestern China

Wang

2020

Land Degrad Dev

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“…Over the past decades, the TP has experienced drastic climatic changes (Yang et al ., 2014), which causes shifts in vegetation phenology (Piao et al ., 2011; Shen et al ., 2011). Several studies suggest that the lengthened LOS positively contributed to the interannual carbon exchange for the alpine shrubland and grassland (Li et al ., 2016; Tao et al ., 2020), and the timing of phenological events largely controlled the seasonal carbon accumulation for the alpine grasslands (Sun et al ., 2020a). Substantial studies and continuous debate have arisen about the shift in spring phenology (Yu et al ., 2010; Shen et al ., 2013; Zhang et al ., 2013), but less attention was paid to autumn phenology (Shen et al ., 2015).…”

Section: Introductionmentioning

confidence: 99%

Spring phenology outweighed climate change in determining autumn phenology on the Tibetan Plateau

Peng

Wang

et al. 2021

Intl Journal of Climatology

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As the third pole of the Earth, the Tibetan Plateau (TP) is highly sensitive to climate change. Phenological changes in spring (i.e., the start of the growing season, SOS) over the TP are of much debate, while our understanding on the variation of autumn phenology (i.e., the end of the growing season, EOS) is still lacking. Given the significance of tracing the latest variation of EOS induced by the ongoing global change, we used the currently longest time series of the normalized difference vegetation index of the Long Term Data Record from the Advanced Very High Resolution Radiometer (AVHRR LTDR NDVI) and investigated the responses of EOS to biological and climatic factors. We found that the EOS showed an insignificantly delayed trend at an average rate of 0.14 daysÁdecade −1 on the TP. This variation was found for all vegetation types except for alpine sparse vegetation. We further showed that spring SOS had the largest contribution to the interannual variations in EOS, where 46.5% of the vegetated areas showed significantly positive correlations between SOS and EOS (p < .05). Temperature (26.5%) and precipitation (18.8%) also had significant positive impacts on EOS, while the contribution of radiation was negative (11.3%). These correlations were regulated by local hydrothermal conditions, especially for precipitation gradients. Using the longest satellite data currently available, with the state-of-art data processing, we demonstrated a weakly delaying trend of EOS and the controlling role of spring phenology on the interannual variability of EOS, which is of great significance to improve our comprehension of the interactions between vegetation dynamics and climate change in the future.

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“…In the TP, various land surface phenological metrics (e.g., the start, end and length of the growing season) have been investigated for their effects on ecosystem carbon assimilation [18][19][20][21]. However, these studies mainly concerned the relationship between phenological metrics and annual ecosystem productivity.…”

Section: Introductionmentioning

confidence: 99%

Direct and Lagged Effects of Spring Phenology on Net Primary Productivity in the Alpine Grasslands on the Tibetan Plateau

2020

Self Cite

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As a key biotic factor, phenology exerts fundamental influences on ecosystem carbon sequestration. However, whether spring phenology affects the subsequent seasonal ecosystem productivity and the underlying resource limitation mechanism remains unclear for the alpine grasslands of the Tibetan Plateau (TP). In this study, we investigated the direct and lagged seasonal responses of net primary productivity (NPP) to the beginning of growing season (BGS) along a precipitation gradient by integrating field observations, remote sensing monitoring and ecosystem model simulations. The results revealed distinct response patterns of seasonal NPP to BGS. Specifically, the BGS showed a significant and negative correlation with spring NPP (R = −0.73, p < 0.01), as evidenced by the direct boosting effects of earlier BGS on spring NPP. Moreover, spring NPP was more responsive to BGS in areas with more annual precipitation. The boosting effects of earlier BGS on NPP tended to weaken in summer compared with that in spring. Sequentially, BGS exhibited stronger positive correlation with autumn NPP in areas with less annual precipitation, which suggested the enhanced lagged suppressing effects of earlier spring phenology on ecosystem carbon assimilation during the later growing season under aggravated water stress. Overall, the strengthened NPP in spring was offset by its decrement in autumn, resulting in no obvious relationship between BGS and annual NPP (R = −0.34, p > 0.05) for the entire grasslands on the TP. The findings of this study imply that the lagged effects of phenology on the ecosystem productivity during the subsequent seasons should not be neglected in the future studies.

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Elevation-dependent effects of growing season length on carbon sequestration in Xizang Plateau grassland

Cited by 12 publications

References 76 publications

Elevational differences in the net primary productivity response to climate constraints in a dryland mountain ecosystem of northwestern China

Elevational differences in the net primary productivity response to climate constraints in a dryland mountain ecosystem of northwestern China

Spring phenology outweighed climate change in determining autumn phenology on the Tibetan Plateau

Direct and Lagged Effects of Spring Phenology on Net Primary Productivity in the Alpine Grasslands on the Tibetan Plateau

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