The intra- and inter-annual responses of soil respiration to climate extremes in a semiarid grassland

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

doi:10.1016/j.geoderma.2020.114629

Cited by 20 publications

(13 citation statements)

References 44 publications

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“…Generally, an increase in VWC will increase the aboveground and underground biomass, as well as substrate concentrations of plants [ 5 , 13 ], thereby enhancing R s [ 14 ]. However, a previous study also found that a decrease in VWC increased T s and then increased R s [ 33 ]. In our study, the average R s of the P −30 treatment was significantly higher than those of the CK and P +30 treatments during the whole growth period ( Figure 2 c, p < 0.05).…”

Section: Discussionmentioning

confidence: 95%

“…Compared with the influence of a single factor, there was a stronger synergistic effect of the relationship between T s and VWC on R s . On the one hand, changes in soil water content have a significant impact on T s [ 33 ]; on the other hand, the soil water content can enhance the effect of R s on T s [ 16 ]. Therefore, a bivariate model (that includes both T s and VWC) can be used to evaluate the changing trend of R s more accurately [ 16 ].…”

Section: Discussionmentioning

confidence: 99%

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Effect of Precipitation Variation on Soil Respiration in Rain-Fed Winter Wheat Systems on the Loess Plateau, China

Chu

et al. 2022

IJERPH

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Global climate change has aggravated the hydrological cycle by changing both the amount and distribution of precipitation, and this is especially notable in the semiarid Loess Plateau. How these precipitation variations have affected soil carbon (C) emission by the agroecosystems is still unclear. Here, to evaluate the effects of precipitation variation on soil respiration (Rs), a field experiment (from 2019 to 2020) was conducted with 3 levels of manipulation, including ambient precipitation (CK), 30% decreased precipitation (P−30), and 30% increased precipitation (P+30) in rain-fed winter wheat (Triticum aestivum L.) agroecosystems on the Loess Plateau, China. The results showed that the average Rs in P−30 treatment was significantly higher than those in the CK and P+30 treatments (p < 0.05), and the cumulative CO2 emissions were 406.37, 372.58 and 383.59 g C m−2, respectively. Seasonal responses of Rs to the soil volumetric moisture content (VWC) were affected by the different precipitation treatments. Rs was quadratically correlated with the VWC in the CK and P+30 treatments, and the threshold of the optimal VWC for Rs was approximately 16.06–17.07%. However, Rs was a piecewise linear function of the VWC in the P−30 treatment. The synergism of soil temperature (Ts) and VWC can better explain the variation in soil respiration in the CK and P−30 treatments. However, an increase in precipitation led to the decoupling of the Rs responses to Ts. The temperature sensitivity of respiration (Q10) varied with precipitation variation. Q10 was positive correlated with seasonal Ts in the CK and P+30 treatments, but exhibited a negative polynomial correlation with seasonal Ts in the P−30 treatment. Rs also exhibited diurnal clockwise hysteresis loops with Ts in the three precipitation treatments, and the seasonal dynamics of the diurnal lag time were significantly negatively correlated with the VWC. Our study highlighted that understanding the synergistic and decoupled responses of Rs and Q10 to Ts and VWC and the threshold of the change in response to the VWC under precipitation variation scenarios can benefit the prediction of future C balances in agroecosystems in semiarid regions under climate change.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Effect of Precipitation Variation on Soil Respiration in Rain-Fed Winter Wheat Systems on the Loess Plateau, China

Chu

et al. 2022

IJERPH

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“…Hence, increasing environmental stress exists within forest ecosystems, decreasing plant and soil health (Stewart et al 2021). Extreme events, such as heatwaves, floods and bushfires, can be short in duration but can have long-lasting impacts upon ecosystem function and services (Li et al 2019(Li et al , 2020a(Li et al , 2021aPeguero et al 2021;Stewart et al 2021), shaping the abundance and distribution of plant communities (Girardin 2009: Li et al 2022a. 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).…”

Section: Introductionmentioning

confidence: 99%

“…Flooding is also an extreme event that is detrimental to ecosystem environments, but flooding tends to increase once drought season has been completed, thus indicating seasonal or annual variations in above or below average water availability. Seasonal and annual variations in temperature and soil moisture are important determinant of growth success within plants and changes in growth ability can lead to variations of landscape distributions, physiological threshold, photosynthesis function and C and N cycling (Li et al 2019(Li et al , 2020a(Li et al , b, 2021a(Li et al , b, c, 2022a.…”

Section: Introductionmentioning

confidence: 99%

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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 is threatening plant growth and soil nutrients of grassland ecosystems: A meta‐analysis

Liu

Siri

et al. 2023

Ecology and Evolution

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As a widespread direct effect of global warming, drought is currently wreaking havoc on terrestrial ecosystems' structure and function, however, the synthesized analysis is lacked to explore the general rules between drought changes and main functional factors of grassland ecosystems. In this work, meta‐analysis was used to examine the impacts of drought on grassland ecosystems in recent decades. According to the results, drought greatly reduced aboveground biomass (AGB), aboveground net primary production (ANPP), height, belowground biomass (BGB), belowground net primary production (BNPP), microbial biomass nitrogen (MBN), microbial biomass carbon (MBC) and soil respiration (SR), and increased dissolved organic carbon (DOC), total nitrogen (TN), total phosphorus (TP), nitrate nitrogen (NO3−‐N), and the ratio of microbial biomass carbon and nitrogen (MBC/MBN). The drought‐related environmental factor mean annual temperature (MAT) was negatively correlated with AGB, height, ANPP, BNPP, MBC, and MBN, however, mean annual precipitation (MAP) had positive effect on these variables. These findings indicate that drought is threatening the biotic environment of grassland ecosystem, and the positive steps should be taken to address the negative effects of drought on grassland ecosystems due to climate change.

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The intra- and inter-annual responses of soil respiration to climate extremes in a semiarid grassland

Cited by 20 publications

References 44 publications

Effect of Precipitation Variation on Soil Respiration in Rain-Fed Winter Wheat Systems on the Loess Plateau, China

Effect of Precipitation Variation on Soil Respiration in Rain-Fed Winter Wheat Systems on the Loess Plateau, China

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

Drought is threatening plant growth and soil nutrients of grassland ecosystems: A meta‐analysis

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