Long-term straw mulch effects on crop yields and soil organic carbon fractions at different depths under a no-till system on the Chengdu Plain, China

Zhou, Zijun; Zeng, Xiangzhong; Chen, Kun; Zhu, Li; Guo, Song; Shangguan, Yuxian; Yu, Hua; Tu, Shuangshuang; Qin, Yusheng

doi:10.1007/s11368-018-02234-x

Cited by 24 publications

(17 citation statements)

References 73 publications

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“…First, carbon sources for topsoil cannot directly increase SOC content in subsoil because most of the carbon input from straw and roots remains in surface layers (Han et al, 2017). For instance, compared with traditional cultivation, straw mulch was found to only increase the SOC content of the 0–10 cm soil layer (Fan et al, 2012; Zhou et al, 2019). Similarly, although crop roots can reach a depth of 70 cm in soil (Luo et al, 2019), the 0–40 cm soil layer is the main root zone and crop roots are concentrated in the topsoil (0–20 cm; Cai, Luo, & Duan, 2003; Frasier et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

“…Increases in crop biomass and straw return are viewed as the main factors affecting topsoil SOC sequestration in China's croplands (Han et al, 2017;Yan et al, 2011). Since the 1980s, crop productivity has greatly increased | 4143 due to improved agronomic practices, such as increasing use of chemical fertilizers and changes in tillage methods (Han et al, 2017;Liu et al, 2003;Zhang et al, 2011;Zhou et al, 2019). For example, the amount of chemical fertilizer increased from 186 kg/ha in 1980 to 423 kg/ha in 2015 (values were calculated from statistical data from the Sichuan Agricultural Statistical Yearbooks, 1980Yearbooks, -2015 and the conventional animal-powered moldboard plow has been widely replaced by mechanical rotary tillage, which has greatly improved nutrient availability and has increased crop yield by 52% in the Chengdu…”

Section: Effects Of Agricultural Land Use and Its Change On Soc Dynmentioning

confidence: 99%

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Depth‐dependent soil organic carbon dynamics of croplands across the Chengdu Plain of China from the 1980s to the 2010s

Dai

et al. 2020

Global Change Biology

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Agricultural soils have tremendous potential to sequester soil organic carbon (SOC) and mitigate global climate change. However, agricultural land use has a profound impact on SOC dynamics, and few studies have explored how agricultural land use combined with soil conditions affect SOC changes throughout the soil profile. Based on a paired soil resampling campaign in the 1980s and 2010s, this study investigated the SOC changes of the soil profile caused by agricultural land use and the correlations with parent material and topography across the Chengdu Plain of China. The results showed that the SOC content increased by 3.78 g C/kg in the topsoil (0–20 cm), but decreased in the 20–40 cm and 40–60 cm soil layers by 0.90 and 1.26 g C/kg respectively. SOC increases in topsoil were observed for all types of agricultural land. Afforestation on former agricultural land also caused SOC decreases in the 20–60 cm soil layers, while SOC decreases only occurred in the 40–60 cm soil layer for agricultural land using a traditional crop rotation (i.e. traditional rice–wheat/rapeseed rotation) and with rice–vegetable rotations converted from the traditional rotations. For each agricultural land use, SOC decreases in deep soils only occurred in high relief areas and in soils formed from Q4 (Quaternary Holocene) grey‐brown alluvium and Q4 grey alluvium that had a relatively low soil bulk density and clay content. The results indicated that SOC change caused by agricultural land use was depth dependent and that the effects of agricultural land use on soil profile SOC dynamics varied with soil characteristics and topography. Subsoil SOC decreases were more likely to occur in high relief areas and in soils with low soil bulk density and low clay content.

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Section: Discussionmentioning

confidence: 99%

Section: Effects Of Agricultural Land Use and Its Change On Soc Dynmentioning

confidence: 99%

Depth‐dependent soil organic carbon dynamics of croplands across the Chengdu Plain of China from the 1980s to the 2010s

Dai

et al. 2020

Global Change Biology

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“…This Pi is of higher lability in these layers compared to the subsurface layers. This could be due to the higher accumulation of SOM on the surface under NT (Zhou et al, 2019), reducing Pi retention in the soil due to organic ions competing for adsorption sites (Sibanda and Young, 1986;Hue, 1991;Mesquita Filho and Torrent, 1993;Ohno and Erich, 1997;Nziguheba et al, 1998;Fink et al, 2016b), and the accumulation of P in these layers partially saturates adsorption sites (Guertal et al, 1991), so that the remaining Pi may be adsorbed with lower energy, possibly facilitating subsequent desorption, as observed by Barrow et al (2018) and Tiecher et al (2012b). In fact, this was observed by de Oliveira et al (2020b) after cultivating this area without P input during successive corn crops, where despite about 100% of crop nutrition was supplied by the 0-5.0 cm layer under broadcast P application, compared to 70% under band application, P offtake and grain yield were similar between both application methods.…”

Section: Proportional Alterations In Soil P Fractionsmentioning

confidence: 99%

Distribution of Soil Phosphorus Fractions as a Function of Long-Term Soil Tillage and Phosphate Fertilization Management

et al. 2020

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The forms in which phosphorus (P) accumulates in soils are dependent on management practices, fertilizer sources, and methods of application, which may promote distinct P solubility and plant uptake. We aimed here to evaluate how soil tillage and phosphate fertilization strategies affected soil P fractions over 17 years and to identify best management practices for improving labile P fractions. The experiment was conducted in a very clayey Rhodic Ferralsol (Oxisol) with initially very low P availability, during 17 years under soybean and corn, fertilized with 35 kg P ha −1 year −1. Treatments were two soil management systems (CT-conventional tillage and NT-no-till) and four phosphate fertilization strategies (TSP-triple superphosphate or RRP-reactive rock phosphate, applied to the crop furrow or broadcast). Soil samples were taken at five depth layers, and organic (Po), inorganic (Pi), and total P (Pt) were determined by Hedley's sequential fractionation. CT resulted in a more homogeneous distribution of Pi fractions throughout the soil profile, while under NT there was a steep depth gradient characterized by Pi accumulation in the fertilizer application zone. NT resulted in accumulation of Pi in more labile fractions and higher accumulation of Po physically protected by aggregation, both compared to CT. Also, under NT with RRP, there was a great accumulation of Pi associated with calcium (HCl Pi) compared to TSP, especially when the fertilizer was broadcast applied. An accumulation of Po down to 20 cm (CT) and 10 cm (NT) was also detected, compared to Cerrado natural soil. NT and RRP positively affected legacy P fractions and can be recommended as strategies to improve P fertilizer use efficiency.

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“…In addition, organic mulch helps to moderate temperature and protect soil and roots from extreme temperature 9 , 10 , prevent pest, reduce the impact of weed, and positively affect the surrounding microclimate 11 . Researchers have carried out comparative studies on effects of organic mulch on soil and water conservation using different mulch material 12 , different time scale 13 , and different soil depth 14 . These studies show that mulch addition to the soil changes its hydraulic functioning as well as its runoff characteristics.…”

Section: Introductionmentioning

confidence: 99%

Efficient organic mulch thickness for soil and water conservation in urban areas

Wang

Niu

Berndtsson

et al. 2021

Sci Rep

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The use of organic mulch is important for urban green applications. For urban areas in arid and semiarid regions receiving short high-intensive rainfall, rainfall characteristics, and soil slope play an important role for mulch functioning. These properties of mulch were studied. For this purpose, rainfall simulation experiments using organic mulching were conducted in Jiufeng National Forestry Park to analyze the influence of organic mulch under different slope and heavy rainfall events. The results showed that soil water content displayed a decreasing tendency with increasing mulch application. Compared to bare soil, a mulch application of 0.25 kg/m2 and 0.50 kg/m2 led to maximum soil water content and maximum runoff decrease occurred for 0.50 kg/m2 mulch. Higher application rate of mulch displayed less soil water content and greater runoff. The runoff amount and runoff generation rate decreased by 28–83% and 21–83%, respectively, as compared to bare soil. With a mulch application of 0.25–1.00 kg/m2, soil drainage accounted for 56–60% of total rainfall. Overall, an efficient mulch application was found to be 0.25–0.50 kg/m2. The results of this study are relevant for arid and semiarid urban regions that experience heavy rainfall.

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Long-term straw mulch effects on crop yields and soil organic carbon fractions at different depths under a no-till system on the Chengdu Plain, China

Cited by 24 publications

References 73 publications

Depth‐dependent soil organic carbon dynamics of croplands across the Chengdu Plain of China from the 1980s to the 2010s

Depth‐dependent soil organic carbon dynamics of croplands across the Chengdu Plain of China from the 1980s to the 2010s

Distribution of Soil Phosphorus Fractions as a Function of Long-Term Soil Tillage and Phosphate Fertilization Management

Efficient organic mulch thickness for soil and water conservation in urban areas

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