Distribution of soil aggregates and organic carbon in deep soil under long-term conservation tillage with residual retention in dryland

Wang, Bisheng; Gao, Lili; Wang, Yu; Wei, Xueqin; Li, Jing; Li, Shengping; Song, Xiaojun; Liang, Guopeng; Dan, Cai; Wu, Xueping

doi:10.1007/s40333-019-0094-6

Cited by 54 publications

(27 citation statements)

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“…The MWD of NT treatment was higher than that of CT treatment at the 0-5 cm, 5-10 cm, and 10-20 cm depths during the three growth periods (Table 2). As found in other studies (Sun et al, 2020;Wang et al, 2019), reducing soil disturbance under NT treatment was beneficial to soil aggregate stability.…”

Section: Discussionsupporting

confidence: 83%

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Soil water repellency influences maize yield by changing soil water availability under long-term tillage management

Liang

et al. 2021

Preprint

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Abstract. Drought is increasingly common due to frequent occurrences of extreme weather events, which further increases soil water repellency (SWR) and influences grain yield. Conservation agriculture is playing a vital role in attaining high food security and it could also increase SWR. However, the relationship between SWR and grain yield under conservation agriculture is still not fully understood. We studied the impact of SWR in 0–5 cm, 5–10 cm, and 10–20 cm layers during three growth periods on grain yield from a soil water availability perspective using a long-term field experiment. In particular, we assessed the effect of SWR on soil water content under two rainfall events with different rainfall intensities. Three treatments were conducted: conventional tillage (CT), reduced tillage (RT), and no-tillage (NT). The results showed that the water repellency index (RI) of NT and RT treatments in 0–20 cm layers was increased by 12.9 %–39.9 % and 5.7 %–18.2 % compared to CT treatment during the three growth periods, respectively. The effect of the RI on soil water content became more obvious with the decrease in soil moisture following rainfall, which was also influenced by rainfall intensity. The RI played a prominent role in increasing soil water storage during the three growth periods compared to the soil total porosity, penetration resistance, mean weight diameter, and organic carbon content. Furthermore, although the increment in the RI under NT treatment increased the soil water storage, grain yield was not influenced by RI (p > 0.05) because the grain yield under NT treatment was mainly driven by penetration resistance and least limiting water range (LLWR). The higher water sorptivity increased LLWR and water use efficiency, which further increased the grain yield under RT treatment. Overall, SWR, which was characterized by water sorptivity and RI, had the potential to influence grain yield by changing soil water availability (e.g. LLWR and soil water storage) and RT treatment was the most effective tillage management compared to CT and NT treatments in improving grain yield.

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Section: Discussionsupporting

confidence: 83%

“…shows some of the soil chemical and physical properties initially. The soil texture is sandy loam and the mean annual precipitation is 483 mm (Wang et al, 2019). One of the main limiting factors for plant growth at the site is spring drought (Wang et al, 2011).…”

Section: Study Site and Experimental Designmentioning

confidence: 99%

Soil water repellency influences maize yield by changing soil water availability under long-term tillage management

Liang

et al. 2021

Preprint

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“…Wang et al. (2019) and Zheng et al. (2018) reported a higher proportion of macroaggregates under the reduced tillage and no‐tillage (NT) systems than in the moldboard and CT systems, while the moldboard and CT systems had more microaggregates.…”

Section: Discussionmentioning

confidence: 99%

Cropping diversity with rice influences soil aggregate formation and nutrient storage under different tillage systems

Jahangir

Jahiruddin

Akter

et al. 2020

J. Plant Nutr. Soil Sci.

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Background: The soils under continuous rice monocropping are currently facing a serious threat of accelerated soil and environmental quality degradation. Aims: Examining the impact of tillage and cropping diversity on soil aggregate stability and associated nutrients in a sub‐tropical rice ecosystem. Methods: A split‐plot experiment with tillage (minimum, MT vs. conventional, CT) as a main plot and cropping diversity [mustard (Brassica napus)–rice (Oryza sativa)–rice (M–R–R), wheat (Triticum aestivum)–rice–rice (W–R–R), and lentil (Lens esculenta)–rice–rice (L–R–R)] as a sub‐plot was repeated for four years. Soil aggregate properties were measured using wet sieving techniques. Soil organic carbon (SOC) and nutrients were measured in different aggregate size groups as well as in the bulk soil samples. Results: Results show that all the aggregate size groups were similar in both MT and CT, except in 0.85–0.30 mm. Likewise, cropping diversities increased soil aggregation, being higher aggregate size of < 0.053 mm in M–R–R relative to the W–R–R and L–R–R, where the latter two were alike. By contrast, > 2 mm aggregates were higher in L–R–R than in M–R–R and W–R–R, where the latter two were similar. The MT increased aggregate mean weight diameter (MWD) by 14% in W–R–R, and by 29% in L–R–R. Soil organic carbon (SOC), total N (TN), and available P were higher in MT than in CT, while it was alike for exchangeable K and available S. While W–R–R had a higher aggregate‐associated SOC, available P, and available S, L–R–R had a higher TN, and M–R–R had a higher exchangeable K. While SOC, TN, and exchangeable K accumulated more in the > 0.85 mm size aggregates, the available P, in contrast, accumulated more in < 0.85 mm size aggregates. Conclusion: Wheat–rice–rice diversity, coupled with minimum tillage, has a higher potential for soil fertility sustenance and crop productivity through better nutrient protection.

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“…The Shouyang experiment was set up in 2003 and the site has a continental monsoon climate with an average annual precipitation of 483 mm (Wang et al, 2019). The annual frost‐free period is approximately 130 days, the experimental site has a sandy loam soil, and the annual average temperature is 7.4°C.…”

Section: Methodsmentioning

confidence: 99%

Factors governing soil water repellency under tillage management: The role of pore structure and hydrophobic substances

Liang

et al. 2020

Land Degrad Dev

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Soil water repellency (SWR) has significant effects on soil degradation by changing some soil processes (e.g., carbon sequestration and soil erosion). Understanding the influence factors of SWR under conservation agriculture are playing a vital role in the sustainable development for improving soil quality. However, how soil pore structure influence on SWR remains unclear. We aim to assess the impact of hydrophobic substances and pore structure on SWR. Here we conducted two long‐term experimental fields with three treatments: conventional tillage (CT), reduced tillage (RT), and no‐tillage (NT). X‐ray tomography and the sorptivity method were used to measure soil pore structure and SWR, respectively. We found that soil organic carbon (SOC) and microbial biomass carbon (MBC) were higher in RT and NT treatments than in CT. MBC had significant influences on soil water sorptivity (Sw) and water repellency index (RI; p < 0.001), whereas SOC had no influence on Sw (p > 0.05). MBC also showed a closer relationship with SWR than SOC in redundancy analysis. The RT and NT increased the porosity of 55–165 μm that had a positive relationship with ethanol sorptivity and RI (p < 0.05). Ethanol sorptivity increased with an increase in soil pore porosity and connectivity under RT and NT treatments. However, increasing the pore surface area could decrease Sw due to enhance contact area between hydrophobic substances and soil water. Overall, the RT and NT treatments increased the water repellency index, which was a result of the interactions between pore structure and hydrophobic substances.

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Distribution of soil aggregates and organic carbon in deep soil under long-term conservation tillage with residual retention in dryland

Cited by 54 publications

References 54 publications

Soil water repellency influences maize yield by changing soil water availability under long-term tillage management

Soil water repellency influences maize yield by changing soil water availability under long-term tillage management

Cropping diversity with rice influences soil aggregate formation and nutrient storage under different tillage systems

Factors governing soil water repellency under tillage management: The role of pore structure and hydrophobic substances

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