Deficit irrigation effectively reduces soil carbon dioxide emissions from wheat fields in Northwest China

Hou, Haijun; Yang, Yaqin; Han, Zhengdi; Cai, Huanjie; Li, Zhanchao

doi:10.1002/jsfa.9800

Cited by 22 publications

(17 citation statements)

References 51 publications

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“…irrigation and fertilization, that increase productivity may also stimulate soil organic matter (SOM) decomposition. For example, large releases of respired soil C are well-established following rewetting of dry soil (Birch 1964;Jarvis et al 2007;Lado-Monserrat et al 2014), and baseline respiration tends to be higher in continually wet soils (Fierer and Schimel 2002;Hou et al 2019). Relieving nutrient limitations through fertilization may either (i) decrease decomposition (negative priming) by preventing socalled ''nutrient mining'' from more stable SOM fractions (Kuzyakov and Domanski 2000), or (ii) increase decomposition (positive priming) of old C or by increasing labile substrates to overcome barriers to decomposition (Luo et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Soil organic matter turnover rates increase to match increased inputs in grazed grasslands

et al. 2021

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Managed grasslands have the potential to store carbon (C) and partially mitigate climate change. However, it remains difficult to predict potential C storage under a given soil or management practice. To study C storage dynamics due to long-term (1952–2009) phosphorus (P) fertilizer and irrigation treatments in New Zealand grasslands, we measured radiocarbon (14C) in archived soil along with observed changes in C stocks to constrain a compartmental soil model. Productivity increases from P application and irrigation in these trials resulted in very similar C accumulation rates between 1959 and 2009. The ∆14C changes over the same time period were similar in plots that were both irrigated and fertilized, and only differed in a non-irrigated fertilized plot. Model results indicated that decomposition rates of fast cycling C (0.1 to 0.2 year−1) increased to nearly offset increases in inputs. With increasing P fertilization, decomposition rates also increased in the slow pool (0.005 to 0.008 year−1). Our findings show sustained, significant (i.e. greater than 4 per mille) increases in C stocks regardless of treatment or inputs. As the majority of fresh inputs remain in the soil for less than 10 years, these long term increases reflect dynamics of the slow pool. Additionally, frequent irrigation was associated with reduced stocks and increased decomposition of fresh plant material. Rates of C gain and decay highlight trade-offs between productivity, nutrient availability, and soil C sequestration as a climate change mitigation strategy.

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Section: Introductionmentioning

confidence: 99%

Soil organic matter turnover rates increase to match increased inputs in grazed grasslands

et al. 2021

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“…After the gas was collected, it was transported back to the laboratory for measurement of the gas concentration with an Agilent gas chromatograph analyzer (7890A GC System, Agilent Technologies, Santa Clara, CA, USA) immediately. Soil respiration was calculated following the method of Hou et al ., 30 and soil temperature at 5 cm deep was measured by geothermometer.…”

Section: Methodsmentioning

confidence: 99%

Carbon balance and controlling factors in a summer maize agroecosystem in the Guanzhong Plain, China

Peng¹,

Ma²,

Cai³

et al. 2022

J Sci Food Agric

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BACKGROUND Quantifying the carbon balance of agroecosystems and clarifying the factors controlling it are essential for estimating the regional carbon cycle and global carbon balance. RESULTS Based on the eddy covariance (EC) technique and soil respiration observations during the 2017 and 2019 summer maize growing seasons, this study analyzed the carbon balance and revealed the factors controlling carbon fluxes in the summer maize agroecosystem. Green leaf area index was the most important factor affecting net ecosystem exchange (NEE), total primary productivity, and total ecosystem respiration (TER) in the rapid development stage during the growing season, followed by soil water content. However, precipitation, air temperature, relative humidity, saturated vapor pressure difference, and photosynthetically active radiation were the main factors that influenced carbon balance at the middle stage. The cumulative TER in 2019 was 40% (320.9 g C m−2) higher than that in 2017. The NEE estimates of summer maize agroecosystems in 2017 and 2019 were −71.7 and 160.4 g C m−2, respectively. Accounting for the carbon input at sowing (10 g C m−2) and the similar carbon output at harvest owing to grain removal, the net biome productivity in 2019 was 1.75 times that in 2017, at −636 and −363 g C m−2, respectively. CONCLUSION The carbon balance of the summer maize agroecosystem in the Guanzhong Plain was determined to be a net carbon source that could export carbon at an average rate of 499.5 g C m−2 yr−1. © 2022 Society of Chemical Industry.

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“…Furthermore, deficit irrigation modifies soil CO 2 emission through changing soil water status because soil water not only is involved in hydrolysis process, but also affects nutrients availability to soil microorganisms 15,16 . It is recognized that limiting irrigation is an effective means of reducing soil CO 2 emission from farmland 9,17 . In addition, the dynamics of soil CO 2 fluxes depends on the initial soil moisture content.…”

Section: Introductionmentioning

confidence: 99%

Response of soil respiration and carbon budget to irrigation quantity/quality and biochar addition in a mulched maize field under drip irrigation

Chen,

Wang,

Tong

et al. 2023

J Sci Food Agric

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BACKGROUNDBiochar addition strongly alters net carbon (C) balance in agroecosystems. However, the effects of biochar addition on net C balance of maize field under various irrigation water quantities and qualities remains unclear. Thus, a field experiment combining two irrigation levels of full (W1) and deficit irrigation (W2 = 1/2 W1), two water salinity levels of fresh (S0, 0.71 g L‐1) and brackish water (S1, 4 g L‐1), and two biochar addition rates of 0 t ha‐1 (B0) and 60 t ha‐1 (B1) was conducted to investigate soil carbon dioxide (CO2) emissions, maize C sequestration, and net C sequestration.RESULTSCompared with W1, W2 reduced average cumulative CO2 emissions by 6.5% and 19.9% for 2020 and 2021, respectively. The average cumulative CO2 emissions under W1S1 treatments were 5.4% and 22.3% lower than W1S0 for 2020 and 2021, respectively, whereas W2S0 and W2S1 had similar cumulative CO2 emissions in both years. Biochar addition significantly increased cumulative CO2 emissions by 17.8‐23.5% for all water and salt treatments in 2020, and reduced average cumulative CO2 emissions by 11.9% for W1 but enhanced it by 8.0% for W2 in 2021. Except for W2S1, biochar addition effectively increased total maize C sequestration by 6.9‐14.8% for the other three treatments through ameliorating water and salt stress over the two years. Compared with W1S0, W1S1 did not affected net C sequestration, but W2 significantly decreased it. Biochar addition increased net C sequestration by 39.47‐43.65 t C ha‐1 for four water and salt treatments for the two years.CONCLUSIONThese findings demonstrate that biochar addition is an effective strategy to increase both crop C sequestration and soil C storage under suitable water‐saving irrigation methods in arid regions with limited freshwater resources.This article is protected by copyright. All rights reserved.

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Deficit irrigation effectively reduces soil carbon dioxide emissions from wheat fields in Northwest China

Cited by 22 publications

References 51 publications

Soil organic matter turnover rates increase to match increased inputs in grazed grasslands

Soil organic matter turnover rates increase to match increased inputs in grazed grasslands

Carbon balance and controlling factors in a summer maize agroecosystem in the Guanzhong Plain, China

Response of soil respiration and carbon budget to irrigation quantity/quality and biochar addition in a mulched maize field under drip irrigation

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