Drought timing influences the sensitivity of a semiarid grassland to drought

Li, Linfeng; Qian, Ruyan; Liu, Wenjun; Wang, Weijin; Zhang, Biao; Kang, Xiaoming; Wen, Fuqi; Ran, Qinwei; Zheng, Zeyu; Xu, Cong; Che, Rongxiao; Xu, Zhihong; Cui, Xiaoyong; Hao, Yanbin; Wang, Yanfen

doi:10.1016/j.geoderma.2022.115714

Cited by 27 publications

(15 citation statements)

References 60 publications

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“…Soil moisture had remarkably positive effects on soil N 2 O emission, which is in agreement with most previous observations in grassland ecosystems (Zhang and Han, 2008;Du et al, 2016;Li et al, 2018). Li et al (2020) reported that N 2 O emission had been suppressed by 31% by precipitation decrease and increased by 55% in precipitation increase conditions. Because low soil moisture status leads to a decline in the mobility of soil available N elements, on the contrary, high soil moisture status leads to loss of soil available N by leaching, which ultimately leads to changes in soil N 2 O emissions (Li et al, 2020).…”

Section: Discussion Precipitation and Amf Collectively Influence Soil...supporting

confidence: 91%

“…Grassland is one of the primary sources of atmospheric N 2 O, contributing to more than 30% of global emissions and accounting for global warming (Chang et al, 2021;Du et al, 2021). Although a large number of studies have investigated the contribution of grassland ecosystems to atmospheric N 2 O emissions, the mechanisms of grassland N 2 O emission under climate change are still not well understood (Li et al, 2020;Chang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Suppression of AMF accelerates N2O emission by altering soil bacterial community and genes abundance under varied precipitation conditions in a semiarid grassland

Meng

Yang

et al. 2022

Front. Microbiol.

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Nitrous oxide (N2O) is one of the most important greenhouse gases contributing to global climate warming. Recently, studies have shown that arbuscular mycorrhizal fungi (AMF) could reduce N2O emissions in terrestrial ecosystems; however, the microbial mechanisms of how AMF reduces N2O emissions under climate change are still not well understood. We tested the influence of AMF on N2O emissions by setting up a gradient of precipitation intensity (+50%, +30%, ambient (0%), −30%, −50%, and −70%) and manipulating the presence or exclusion of AMF hyphae in a semiarid grassland located in northeast China. Our results showed that N2O fluxes dramatically declined with the decrease in precipitation gradient during the peak growing season (June–August) in both 2019 and 2020. There was a significantly positive correlation between soil water content and N2O fluxes. Interestingly, N2O fluxes significantly decreased when AMF were present compared to when they were absent under all precipitation conditions. The contribution of AMF to mitigate N2O emission increased gradually with decreasing precipitation magnitudes, but no contribution in the severe drought (−70%). AMF significantly reduced the soil’s available nitrogen concentration and altered the composition of the soil bacteria community including those associated with N2O production. Hyphal length density was negatively correlated with the copy numbers of key genes for N2O production (nirK and nirS) and positively correlated with the copy numbers of key genes for N2O consumption (nosZ). Our results highlight that AMF would reduce the soil N2O emission under precipitation variability in a temperate grassland except for extreme drought.

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Section: Discussion Precipitation and Amf Collectively Influence Soil...supporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Suppression of AMF accelerates N2O emission by altering soil bacterial community and genes abundance under varied precipitation conditions in a semiarid grassland

Meng

Yang

et al. 2022

Front. Microbiol.

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“…Previous studies have shown that climate change has significant effects on grassland NPP ( Liu et al, 2021 ; Xiong et al, 2021 ). In the past few decades, global grassland NPP has undergone significant changes owing to climate change ( Cao et al, 2020 ; Li et al, 2022 ), which may affect the ecological environment and carbon cycle in the grassland regions ( Shen et al, 2020 ). Understanding spatiotemporal changes in grassland NPP and its response to climate change is essential for predicting grassland carbon storage capacity and clarifying the relationship between vegetation and climate.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Change of Net Primary Productivity and Its Response to Climate Change in Temperate Grasslands of China

Xia

Liu

et al. 2022

Front. Plant Sci.

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The temperate grasslands in China play a vital part in regulating regional carbon cycle and climate change. Net primary productivity (NPP) is a crucial index that reflects ecological function of plants and the carbon sequestration capacity of grassland ecosystem. Climate change can affect NPP by changing vegetation growth, but the effects of climate change on the NPP of China’s temperate grasslands remain unclear. Based on MODIS data and monthly climate data during 2000–2020, this study explored the spatiotemporal changes in grassland NPP and its response to climate change in temperate grasslands of China. We found that the annual NPP over the entire China’s temperate grasslands increased significantly by 4.0 gC/m2/year from 2000 to 2020. The annual NPP showed increasing trends for all the different grassland vegetation types, with the smallest increase for temperate desert steppe (2.2 gC/m2/year) and the largest increase for temperate meadow (5.4 gC/m2/year). The correlation results showed that increased annual precipitation had a positive relationship with the NPP of temperate grasslands. Increased summer and autumn precipitation could increase grassland NPP, particularly for the temperate meadow. With regard to the effects of temperatures, increased temperature, particularly the summer maximum temperature, could decrease annual NPP. However, increased spring minimum temperature could increase the NPP of temperate desert steppe. In addition, this study found, for the first time, an asymmetric relationship between summer nighttime and daytime warming and the NPP of temperate meadow. Specifically, nighttime warming can increase NPP, while daytime warming can reduce NPP in temperate meadow. Our results highlight the importance of including seasonal climate conditions in assessing the vegetation productivity for different grassland types of temperate grasslands and predicting the influences of future climate change on temperate grassland ecosystems.

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“…Increasing temperatures and heatwaves lead to increasing intensity and frequency of droughts, which can cause a warmer and drier environment, resulting in increases in bushfires and lighting frequency (Girardin 2009;Li et al 2021a). Increasing temperatures and heatwaves together with increased droughts have been related to tree mortality events (Li et al 2021b(Li et al , 2022b. Drought stress is a large component of global crisis in forest and plant health risks due to the lack of water availability, leading to plant dieback at a regional and global scale (Peguero et al 2021).…”

Section: Introductionmentioning

confidence: 99%

The variation and trends of nitrogen cycling and nitrogen isotope composition in tree rings: the potential for fingerprinting climate extremes and bushfires

Succarie

Wang

2022

J Soils Sediments

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Purpose Climate extremes, such as droughts and floods, have become intensified and more frequent due to intensifying climate change. Increased atmospheric carbon dioxide (CO2) and warming-induced water limitation, as well as climate extremes, may alter carbon (C) and nitrogen (N) cycling in forest ecosystems. This provides a brief review of stable nitrogen isotopic composition (δ15N) in tree ring in relation to climate extremes and bushfires in context of N availability and losses in forest ecosystems. Material and methods Tree rings were extracted from four Pinus sylvestris and four Larix gmelinii sample trees, located in a boreal plantation forest of Mohe City, Heilongjiang Province, China. Tree rings were measured to obtain mean annual basal area increment (BAI), while tree ring δ15N and total N concentrations were measured on mass spectrometer at 3-year intervals. The tree ring δ15N data were related to possible climate extremes and bushfires. A brief review of the relevant literature was also undertaken to support our preliminary research findings. Results and discussion Globally, increasing atmospheric CO2 concentration and water limitations have led to a warmer-drier climate. This has also been associated with increases of climate extremes such as drought and floods as well as bushfires. These extremes have been recorded with detrimental effects on plant and soil structures within forest ecosystems and play an important role in regulating N availability and losses in forest ecosystems. Studies of N deposition within forest ecosystems using soil and plant δ15N also showed that N losses under various climate extremes can occur through direct changes in N cycling, such as increasing soil nitrification and denitrification or leaching. It is highlighted that tree rings δ15N has the potential to fingerprint the intensity and frequency of climate extremes and bushfires in the forest ecosystems, but more such tree ring δ15N research needs to be done in diversified forest ecosystems to confirm the potential of using tree ring δ15N for quantifying the frequency and intensity of climate extremes and bushfires at both regional and global scale. Conclusion The variation and trend of δ15N in the soil–plant-climate systems are closely linked to the N cycling in forest ecosystems, and tree ring δ15N has the great potential to fingerprint both intensity and frequency of climate extremes such as drought and floods as well as bushfires.

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Drought timing influences the sensitivity of a semiarid grassland to drought

Cited by 27 publications

References 60 publications

Suppression of AMF accelerates N2O emission by altering soil bacterial community and genes abundance under varied precipitation conditions in a semiarid grassland

Suppression of AMF accelerates N2O emission by altering soil bacterial community and genes abundance under varied precipitation conditions in a semiarid grassland

Spatiotemporal Change of Net Primary Productivity and Its Response to Climate Change in Temperate Grasslands of China

The variation and trends of nitrogen cycling and nitrogen isotope composition in tree rings: the potential for fingerprinting climate extremes and bushfires

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