Ecosystem water use efficiency in a young plantation in Northern China and its relationship to drought

Ma, Jingyong; Jia, Xin; Zha, Tianshan; Bourque, Charles P.‐A.; Tian, Yun; Bai, Yujie; Liu, Peng; Yang, Ruizhi; Li, Cheng; Li, Chunyi; Xie, Jing; Yu, Hao; Zhang, Feng; Zhou, Caixian

doi:10.1016/j.agrformet.2019.05.004

Cited by 83 publications

(41 citation statements)

References 49 publications

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“…Soil water content and VPD determined seasonal variation in RUEs by controlling Pn and E, but more predominantly Pn (Supplementary Material Figures S1A-C and S2A-C). High VPD induced stomatal closure, preventing excessive water loss, resulting in decreased Gs and, thus, a disproportionately larger decrease in Pn, than in E [40][41][42]. This led to a lowering of WUE, as shown by its negative relationship with VPD and Gs (Table 1).…”

Section: Variations In Rues and Their Controlling Factorsmentioning

confidence: 98%

Dynamic Changes in Plant Resource Use Efficiencies and Their Primary Influence Mechanisms in a Typical Desert Shrub Community

Jiang

Tian

Zha

et al. 2021

Forests

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Understanding plant resource use efficiencies (RUEs) and their tradeoffs in a desert shrub community, particularly as it concerns the usage of water, light, and nitrogen, remains an ecological imperative. Plant RUEs have been widely used as indicators to understand plant acclimation processes to unfavorable environmental conditions. This study aimed to examine seasonal dynamics in RUEs in two widely distributed plant species in a typical desert shrub community (i.e., Artemisia ordosica and Leymus secalinus) based on in-situ measurements of leaf photosynthesis, specific leaf area (SLA), leaf nitrogen concentration (i.e., Nmass + Narea), and several site-related abiotic factors. Both species exhibited significant seasonal variation in RUEs, with a coefficient of variation (CV) > 30% and seasonal divergence among the various RUEs. Seasonal divergence was largely controlled by variation in stomatal conductance (Gs), which was in turn influenced by variation in soil water content (SWC) and water vapor pressure deficit (VPD). RUEs between species converged, being positively correlated, yielding: (i) r2 = 0.40 and p < 0.01 for WUE; (ii) r2 = 0.18 and p < 0.01 for LUE；and (iii) r2 = 0.25 and p < 0.01 for NUE. RUEs for A. ordosica were mostly larger than those for L. secalinus, but less reactive to drought. This suggests A. ordosica was more conservative in its usage of available resources and was, therefore, better able to adapt to arid conditions. Resource use strategies between species differed in response to drought. Desert shrubs are projected to eventually replace grasses, as drought severity and duration increase with sustained regional climate change.

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Section: Variations In Rues and Their Controlling Factorsmentioning

confidence: 98%

Dynamic Changes in Plant Resource Use Efficiencies and Their Primary Influence Mechanisms in a Typical Desert Shrub Community

Jiang

Tian

Zha

et al. 2021

Forests

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“…Tong et al 2014 , based on a 5-year experimental dataset, showed that the GPP/ET was approximately 30 higher under cloudy skies as result of the increase in the proportion of diffuse radiation. Ma et al 2019 found that drought reduced the GPP/ET in a young plantation, whereas Liu et al 2017 found that drought enhanced the GPP/ET in an old-growth sub-tropical forest.…”

Section: Connections Between Carbon and Water Fluxesmentioning

confidence: 99%

Progress in water and energy flux studies in Asia: A review focused on eddy covariance measurements

Kang¹,

Cho

2021

J. Agric. Meteorol.

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The eddy covariance EC technique-based observation system allows for researchers to determine latent and sensible heat fluxes, which are key components of the surface energy balance. The number of water and energy flux studies in Asia has increased as the number of flux measurement sites and the length of the observation periods have grown. To retrace the footprints of the AsiaFlux network and predict future research directions, we reviewed the progress in water and energy flux studies in Asia from the 1990s to the present day. This included studies on continuous evapotranspiration ET and surface energy balance measurements in various ecosystems, from the tropics to the polar regions. We also reviewed comparative experiments between the EC technique and other observation techniques including the use of a lysimeter or scintillometer, data processing techniques, connections between carbon and water fluxes, and multi-site syntheses. This paper discusses three remaining challenges that are hindering the derivation of scientific knowledge for ET and the surface energy balance, namely: the non-closure of the surface energy budget, imperfect compatibility between open-and closed-path gas analyzers, and difficulty in partitioning ET into evaporation and transpiration. If we leverage the advantages of the EC technique i.e., high sampling rates of ≥ 10 Hz and continuous measurement capabilities , standardized methods for correcting and partitioning can be developed in the near future.

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“…Under the climate conditions, various ecosystems are widely distributed in China (Figure 1). Additionally, drought is one of the most damaging and disastrous hazards in China [46]. Thus, our research explored the influences of water conditions on vegetation growth (i.e., GPP) and its response in China.…”

Section: The Ecosystem Types and Climate Conditions Of Chinamentioning

confidence: 99%

Diverse Roles of Previous Years’ Water Conditions in Gross Primary Productivity in China

Zhou

Luo

et al. 2020

Remote Sensing

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Gross primary productivity is one of the most important indicators of ecosystem function, which is related to water conditions and shown high interannual variation. Due to the time-lag effect, not only the current water condition but also the previous water conditions (e.g., one year before) impact the gross primary productivity (GPP). Revealing the impacts of current and previous years’ water status is currently a hot topic. In this study, we designed a series of water deficit scenarios based on the meteorological dataset of the Climatic Research Unit (CRU) and then analysed the responses of the remote sensing-based moderate resolution imaging spectroradiometer (MODIS) gross primary productivity (GPP) in China, from which the role of water deficit in time periods was evaluated. The results indicate that the impact of climate factors (i.e., water, temperature and radiation) on GPP has a high spatial heterogeneity and that water-limited regions that are primarily distributed in North and Northwestern China show a stronger water-GPP relationship than water-unlimited regions. The water deficit that occurred in different periods had a variable impact on GPP. Specifically, GPP was primarily controlled by the current year’s water conditions in the water-limited regions, with the importance value of 52.8% (the percentage of Increased Mean Square Error, %IncMSE) and 3.8 (the mean decrease in node impurity, IncNodePurity), but at the same time, it was conditionally affected by the water status in the previous year, with the importance value of 20.4% (%IncMSE) and 0.6 (IncNodePurity). The role of water in previous years is multifarious, which depends on the water conditions of the current year. The results revealed by the scenarios indicate that the influence of water conditions in the previous year was not statistically significant when the water conditions of the current year were in a drought. In contrast, when the current year’s water conditions were normal or wetter, the water conditions in the previous year (i.e., one-year time lag) were also important and the increase of GPP significantly depended on the water condition (p < 0.05). The diverse roles of water conditions in previous years on GPP and its non-ignorable time-lag effect revealed in this study imply that not only the current year’s water condition but also its dynamic changes in previous years should be considered when predicting changes in GPP caused by climate change.

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Ecosystem water use efficiency in a young plantation in Northern China and its relationship to drought

Cited by 83 publications

References 49 publications

Dynamic Changes in Plant Resource Use Efficiencies and Their Primary Influence Mechanisms in a Typical Desert Shrub Community

Dynamic Changes in Plant Resource Use Efficiencies and Their Primary Influence Mechanisms in a Typical Desert Shrub Community

Progress in water and energy flux studies in Asia: A review focused on eddy covariance measurements

Diverse Roles of Previous Years’ Water Conditions in Gross Primary Productivity in China

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