Soil hydrothermal modeling in a dry alpine agricultural zone: The effect of soil airflow

Wang, Jiaxin; Zhao, Xueyong; Wan, Hua; Zeng, Yijian; Yu, Lianyu; Robinson, Brett; Zhou, Yihang; Siddique, Kadambot H. M.; Wu, Pute

doi:10.1016/j.geoderma.2021.115354

Cited by 6 publications

(6 citation statements)

References 85 publications

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“…Compared with other models, the model used here can theoretically reduce structure‐based errors in porous soils where soil airflow can affect soil water migration (Prunty & Bell, 2007; Y. Zeng et al., 2011a). Our previous study showed that soil moisture modeling accuracy can be markedly increased by coupling the airflow mechanism during >22.8 mm rainfall events (J. X. Wang et al., 2021). Furthermore, B. Yang et al.…”

Section: Discussionmentioning

confidence: 99%

Disentangling the Impact of Event‐ and Annual‐Scale Precipitation Extremes on Critical‐Zone Hydrology in Semiarid Loess Vegetated by Apple Trees

Zhao

Wan

Zeng

et al. 2023

Water Resources Research

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The extent and mechanisms by which precipitation extremes affect hydrological processes in the critical zone (CZ) of loess possessing a thick unsaturated zone remains poorly understood. To this end, we here employed a coupled liquid‒vapor‒heat‒airflow STEMMUS (simultaneous transfer of energy, mass, and momentum in unsaturated soil) model to investigate the impact of extreme precipitation, at both event and annual scales, on CZ hydrological processes within a semiarid loess site vegetated by apple trees on China's Loess Plateau. At the event scale, the vapor flux was two orders of magnitude lower than the liquid water flux. However, the thermal vapor flux penetrated to depths of 200 cm, whereas the isothermal liquid water flux only infiltrated to 100 cm during the study period, implying that thermal‐gradient‐driven vapor transfer is an important mechanism for deep‐layer recharge (DLR). At the annual scale, the DLR below 200 cm during extremely wet years was 6.5 times larger than that during extremely dry years. In contrast, extreme changes in climate had only limited impacts on evapotranspiration; the difference between extremely wet and extremely dry years averaged only 35 mm, much less than the difference in precipitation, which averaged 310 mm. However, the extremely dry years showed a higher ratio (0.58) between transpiration and evapotranspiration than did the extremely wet years (0.51). The findings reported here improve our understanding of CZ hydrological processes related to precipitation extremes in semiarid loess regions.

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Section: Discussionmentioning

confidence: 99%

Disentangling the Impact of Event‐ and Annual‐Scale Precipitation Extremes on Critical‐Zone Hydrology in Semiarid Loess Vegetated by Apple Trees

Zhao

Wan

Zeng

et al. 2023

Water Resources Research

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“…Other influential parameters were selected based on sensitivity analyses previously performed by J. Wang et al. (2021a). Parameters selected for the analysis were perturbed by varying each parameter by ±30%, ±20%, and ±10% while keeping the others fixed to the value of the control simulation (after initial parameterization).…”

Section: Methodsmentioning

confidence: 99%

Eco‐Physiological Constraints of Deep Soil Desiccation in Semiarid Tree Plantations

Shao,

Gao,

Zeng

et al. 2023

Water Resources Research

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Deep soil water, defined here as the soil water below a certain depth and not recharged by precipitation in one growing season, plays a critical role in maintaining eco‐physiological functioning in thick‐vadose‐zone regions. However, science‐based evidence remains limited on how and the extent to which deep soil desiccation (DSD) affects the eco‐physiological features of apple trees. Here, we improve a process‐based model to disentangle trees' transpiration and photosynthesis responses to precipitation and DSD below 200 cm (DSD200) on the semiarid Loess Plateau. We defined four DSD200 scenarios: 60%–70% of field capacity (FC) as a control, 50%–60%, 40%–50%, and 30%–40% of FC representing mild (MID), moderate (MOD) and severe (SED) desiccation, respectively; and five precipitation scenarios: extremely dry (285.78 mm), dry (392 mm), normal (457.72 mm), wet (524.96 mm), and extremely wet years (630.44 mm). We found that the stomatal conductance, net photosynthetic rate and transpiration under MOD and SED decreased significantly (p < 0.05), independent of precipitation years, indicating clear stomatal limitation induced by DSD200. This phenomenon was greatly enhanced in extremely dry years, with these variables decreasing on average by 29%, 36%, and 37%, respectively. Furthermore, SED resulted in non‐stomatal limitation with a great decrease in electron transport rates (Jmax) and maximum carboxylation rates (VCmax). Jmax and VCmax decreased by 40% and 26%, respectively, on average, in extremely dry years. These findings indicate that the combination of severe meteorological drought and deep soil drought resulted in non‐stomatal limitation for the apple trees. Persistent non‐stomatal limitation may be an important mechanism causing tree mortality in semiarid loess regions.

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“…Prior to modeling, we applied a one‐factor‐at‐a‐time approach (Wang et al., 2021) to test the sensitivity of soil P dynamics model parameters (see Supporting Information). Because most of the datasets were collected from official or international agencies, and there was no repetitive datasets available to cross‐validate them, uncertainties from the datasets (e.g., clerical errors) were not analyzed and as a consequence we only addressed the uncertainties of parameters of the P cycle model.…”

Section: Methodsmentioning

confidence: 99%

“…Table S10 summarized the soil P dynamics model parameters used in this study. We used the coefficient of determination ( R 2 ) and the index of agreement ( d ) (Li et al., 2022; Wang et al., 2021) to assess the modeling accuracy, expressed as

R^{2} goodbreak= {(\frac{n * \sum_{i = 1}^{i = n} ()(, {Sim}_{i} * {Obs}_{i}) - \sum_{i = 1}^{i = n} {Sim}_{i} * \sum_{i = 1}^{i = n} {Obs}_{i}}{\sqrt{n * \sum_{i = 1}^{i = n} {Sim}_{i}^{2} - {(\sum_{i = 1}^{i = n} {Sim}_{i})}^{2}} * \sqrt{n * \sum_{i = 1}^{i = n} {Obs}_{i}^{2} - {(\sum_{i = 1}^{i = n} {Obs}_{normali})}^{2}}})}^{2},

d goodbreak= 1 goodbreak- \frac{\sum_{i = 1}^{i = n} {({Sim}_{i} - {Obs}_{i})}^{2}}{\sum_{i = 1}^{i = n} {(|{Sim}_{i} - \overset{true¯}{Obs}| + |{Obs}_{i} - \overset{true¯}{Obs}|)}^{2}},

where

n

is the number of paired observed and simulated values,

{Obs}_{i}

is the i th observed value,

\overset{Obs}{true}

is the mean obs...…”

Section: Methodsmentioning

confidence: 99%

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Managing mineral phosphorus application with soil residual phosphorus reuse in Canada

Wang,

Qi,

Bennett

2023

Global Change Biology

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With limited phosphorus (P) supplies, increasing P demand, and issues with P runoff and pollution, developing an ability to reuse the large amounts of residual P stored in agricultural soils is increasingly important. In this study, we investigated the potential for residual soil P to maintain crop yields while reducing P applications and losses in Canada. Using a P cycling model coupled with a soil P dynamics model, we analyzed soil P dynamics over 110 years across Canada's provinces. We found that using soil residual P may reduce mineral P demand as large as 132 Gg P year−1 (29%) in Canada, with the highest potential for reducing P applications in the Atlantic provinces, Quebec, Ontario, and British Columbia. Using residual soil P would result in a 21% increase in Canada's cropland P use efficiency. We expected that the Atlantic provinces and Quebec would have the greatest runoff P loss reduction with use of residual soil P, with the average P loss rate decreasing from 4.24 and 1.69 kg ha−1 to 3.45 and 1.38 kg ha−1, respectively. Ontario, Manitoba, and British Columbia would experience relatively lower reductions in P loss through use of residual soil P, with the average runoff P loss rate decreasing from 0.44, 0.36, and 4.33 kg ha−1 to 0.19, 0.26, and 4.14 kg ha−1, respectively. Our study highlights the importance of considering residual soil P as a valuable resource and its potential for reducing P pollution.

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Soil hydrothermal modeling in a dry alpine agricultural zone: The effect of soil airflow

Cited by 6 publications

References 85 publications

Disentangling the Impact of Event‐ and Annual‐Scale Precipitation Extremes on Critical‐Zone Hydrology in Semiarid Loess Vegetated by Apple Trees

Disentangling the Impact of Event‐ and Annual‐Scale Precipitation Extremes on Critical‐Zone Hydrology in Semiarid Loess Vegetated by Apple Trees

Eco‐Physiological Constraints of Deep Soil Desiccation in Semiarid Tree Plantations

Managing mineral phosphorus application with soil residual phosphorus reuse in Canada

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