Environmental controls on carbon and water fluxes of a wheat-maize rotation cropland over the Huaibei Plain of China

Xing, Wanqiu; Yang, Liu; Wang, Weiguang; Yu, Zhongbo; Shao, Quanxi; Xu, Shiyi; Fu, Jianyu

doi:10.1016/j.agwat.2023.108310

Cited by 6 publications

(10 citation statements)

References 65 publications

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“…Similar results show that PAR is the dominant factor controlling the variation in daily NEE in cropland ecosystems. This was verified in a wheat-maize rotation system in the Huaibei Plain of China [37], and a maize field in the arid areas upstream of the Yellow River Basin [38]. In addition, the carbon-sink capacity of the non-timber forest ecosystem (Zanthoxylum bungeanum Maxim plantation) in this study area was closely related to PAR, which is consistent with the light preference of Zanthoxylum bungeanum Maxim growth [39].…”

Section: Effects Of Environmental Factors On Carbon Fluxessupporting

confidence: 80%

A Typical Small Watershed in Southwestern China Is Demonstrated as a Significant Carbon Sink

Chen,

Lu,

Yin

et al. 2024

Land

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Small watersheds are fundamental units for natural processes and social management in Southwestern China. Accurately assessing carbon sinks in small watersheds is crucial for formulating carbon sink management policies. However, there has been a lack of assessment of the dynamics of carbon fluxes in the major ecosystems of small watersheds. Here, we selected the Reshuihe River watershed, which is a typical small watershed in Southwestern China, to measure carbon fluxes using eddy covariance systems for two years (October 2021 to September 2023) from three major ecosystems, namely forest, cropland, and non-timber forest. We compared variations and controlling factors of net ecosystem exchange (NEE), gross primary productivity (GPP), and ecosystem respiration (Re) among different ecosystems, and estimated annual watershed carbon flux based on the land cover areas of the three ecosystems. This study found that three ecosystems were net annual carbon sinks during the study period. Forest was the strongest (−592.8 and −488.1 gC m−2 a−1), followed by non-timber forest (−371.0 gC m−2 a−1), and cropland was the smallest (−92.5 and −71.6 gC m−2 a−1), after taking fallow period into account. Weeds were a significant source of carbon flux in non-timber forest ecosystems. It was also found that variations in daily NEE were controlled by photosynthetically active radiation and soil volumetric water content, with weak effects related to temperature also being observed. However, when the temperature exceeded 21 °C, GPP and Re were significantly reduced in cropland. Finally, it was discovered that the total carbon sink of the three ecosystems in the watershed for one year was −52.15 Gg C. Overall, we found that small watersheds dominated by forest ecosystems in Southwestern China have a strong carbon sink capacity.

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Section: Effects Of Environmental Factors On Carbon Fluxessupporting

confidence: 80%

A Typical Small Watershed in Southwestern China Is Demonstrated as a Significant Carbon Sink

Chen,

Lu,

Yin

et al. 2024

Land

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“…This negative inhibitory effect aforementioned was also found in previous studies on winter wheat, rice, forests and others (Zhao et al 2007;Wang et al 2014;Xing et al 2023). It also indicated that the high WUE tends to exist in the plants with lower GPP and ET, so the photosynthesis can be sustaining under drought conditions (Gang et al 2016).…”

Section: Impact Of Asymmetrical Variations Of Gpp and Et On Wuesupporting

confidence: 75%

“…WUE varied significantly due to crop strain, planting variations, environmental differences and field managements (Wang et al 2017;Xing et al 2023;Alberto et al 2011). To avoid confusion caused by different observation methods, the WUE values for rice and winter wheat were only collected from published studies based on the continuous observations of EC methods for at least one growing season.…”

Section: Comparison Of Wue With Previous Studiesmentioning

confidence: 99%

“…Rice (Oryza sativa L.) provides food for above 33% of the global population (Chen, Li, et al 2021); however, as a water-intensive agroecosystem, paddy consumes almost 80% of all agricultural water usage in Asia and the water need anticipated due to the warmer climate and seasonal water shortage in the East and South Asian countries (Boretti and Rosa 2019;Parihar et al 2017). Therefore, how to effectively balance the carbon sequestration and water loss is crucial for food security and sustainability development in agroecosystems (Tian et al 2021;Xing et al 2023).…”

mentioning

confidence: 99%

“…Furthermore, wheat and rice are not independent of each other in rice-wheat rotation. Rice management directly affects the subsequent wheat-growing environment (Chen, Li, et al 2021;, which is relatively different from pure wheat cultivation or maize-wheat rotation (Xing et al 2023;Nguyen et al 2022). Thus, more studies are needed to depict the variation of WUE and its mechanism for rice-wheat rotation cropland, especially on monthly and shorter time scales.…”

mentioning

confidence: 99%

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Diurnal and Seasonal Variations of Water Use Efficiency of Rice–Wheat Rotation Cropland in the Jianghuai River Basin of China

Zhao,

Zhang,

Weng

et al. 2024

J Agronomy Crop Science

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Rice–wheat rotation cropland is one of the most important agroecosystems in South China, the escalation of conflict between food demand augment and water supply shortage increased with climate change. Water use efficiency plays a more significant role in optimising water and carbon management. Thus, the diurnal and seasonal variations of water use efficiency were assessed by the 3‐year eddy covariance observations in the Shouxian National Observatory, a typical rice–wheat rotation station. The results revealed a ‘U’‐shaped diurnal pattern of water use efficiency for winter wheat (Triticum aestivum L.) and rice (Oryza sativa L.). Seasonal water use efficiency had two peaks with the highest in the winter wheat‐growing season. The average water use efficiency for the rice–wheat rotation cropland was 2.85 g C kg−1 H2O over the whole year with 2.62 and 3.11 g C kg−1 H2O for winter wheat and rice, respectively. However, gross primary productivity and evapotranspiration of rice were higher than those of winter wheat. Temperature, photosynthetically active radiation were the principal impact factors of water use efficiency in the rice‐growing season. Comparatively, soil water and vapour pressure deficit dominated the water use efficiency changes in the winter wheat‐growing season. Our analyses can help understand the water use requirements for carbon assimilation on rice–wheat rotation cropland on the field scale.

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Studies on Root Growth, Yield and Resilience of Winter Wheat Under Waterlogging Control in Huaibei Plain, China

Xu,

Li,

Liu

et al. 2024

J Plant Growth Regul

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Environmental controls on carbon and water fluxes of a wheat-maize rotation cropland over the Huaibei Plain of China

Cited by 6 publications

References 65 publications

A Typical Small Watershed in Southwestern China Is Demonstrated as a Significant Carbon Sink

A Typical Small Watershed in Southwestern China Is Demonstrated as a Significant Carbon Sink

Diurnal and Seasonal Variations of Water Use Efficiency of Rice–Wheat Rotation Cropland in the Jianghuai River Basin of China

Studies on Root Growth, Yield and Resilience of Winter Wheat Under Waterlogging Control in Huaibei Plain, China

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