Distribution and storage of crop residue carbon in aggregates and its contribution to organic carbon of soil with low fertility

Li, Shuangyi; Gu, Xiaoxiong; Zhuang, Jie; An, Tingting; Pei, Jiubo; Xie, Huaming; Li, Hui; Fu, Suhua; Wang, Jingkuan

doi:10.1016/j.still.2015.08.009

Cited by 94 publications

(45 citation statements)

References 53 publications

(62 reference statements)

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“…In this way, both the NPKM and NPKS treatments may benefit soil C sequestration because of their relatively low phenol oxidase activity (Fig 3). In contrast, NPK might limit SOC content due to a high peroxidase activity under NPK, which negatively affects labile organic carbon fraction [46]. RDA showed that changes in enzyme activities depended on soil available P and N (Fig 4), consistent with the previous finding that soil enzymes are correlated with nutrient availability [47].…”

Section: Discussionsupporting

confidence: 87%

Effects of inorganic and organic amendment on soil chemical properties, enzyme activities, microbial community and soil quality in yellow clayey soil

et al. 2017

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Understanding the effects of external organic and inorganic components on soil fertility and quality is essential for improving low-yielding soils. We conducted a field study over two consecutive rice growing seasons to investigate the effect of applying chemical fertilizer (NPK), NPK plus green manure (NPKG), NPK plus pig manure (NPKM), and NPK plus straw (NPKS) on the soil nutrient status, enzyme activities involved in C, N, P, and S cycling, microbial community and rice yields of yellow clayey soil. Results showed that the fertilized treatments significantly improved rice yields over the first three experimental seasons. Compared with the NPK treatment, organic amendments produced more favorable effects on soil productivity. Notably, the NPKM treatment exhibited the highest levels of nutrient availability, microbial biomass carbon (MBC), activities of most enzymes and the microbial community. This resulted in the highest soil quality index (SQI) and rice yield, indicating better soil fertility and quality. Significant differences in enzyme activities and the microbial community were observed among the treatments, and redundancy analysis showed that MBC and available N were the key determinants affecting the soil enzyme activities and microbial community. The SQI score of the non-fertilized control (0.72) was comparable to that of the NPK (0.77), NPKG (0.81) and NPKS (0.79) treatments but significantly lower compared with NPKM (0.85). The significant correlation between rice yield and SQI suggests that SQI can be a useful to quantify soil quality changes caused by different agricultural management practices. The results indicate that application of NPK plus pig manure is the preferred option to enhance SOC accumulation, improve soil fertility and quality, and increase rice yield in yellow clayey soil.

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Section: Discussionsupporting

confidence: 87%

Effects of inorganic and organic amendment on soil chemical properties, enzyme activities, microbial community and soil quality in yellow clayey soil

et al. 2017

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“…Similar to the results reported by other studies (Garcia-Franco, Albaladejo, Almagro, & Martínez-Mena, 2015;Li et al, 2016), the results presented also indicate that NTS increased POC and MOC at the 0-5 cm depth ( Figure S1). Furthermore, the increment in the 0-5 cm depth resulted from the homogeneous distribution of POC (Wander & Traina, 1996) with a low C mineralization potential (Alvarez & Alvarez, 2000).…”

Section: Contribution Of Soc Fractions To Soc Variabilitysupporting

confidence: 91%

Temporal variability of soil organic carbon in paddies during 13‐year conservation tillage

Wang

Zhao

et al. 2019

Land Degrad Dev

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Decreasing temporal variability of soil organic carbon (SOC) can avoid its temporary loss, which is positive to SOC accumulation and mitigation of climate change. Thus, this study was designed to analyze the temporal variability of SOC stock during 13‐year tillage practices and its driving factors in rice paddies of Southern China. Four tillage practices were studied: no‐till (zero‐tillage) with residues retained on the soil surface (NTS, conservation tillage), rotary tillage with incorporated residues (RTS), moldboard plow tillage with incorporated residues, or with residues removed. The SOC stock at 0–30 cm soil depth varied widely between 2007 and 2017, partly due to the annual temperature and precipitation variations. The temporal variation of SOC was lower under NTS than other tillage practices (p < .05). This was associated with the lower variation of heavy SOC and mineral associated SOC as well as with lower (p < .05) potential mineralizable carbon under NTS. Despite SOC saturated in all treatments, NTS increased (p < .05) the SOC content by 12.1%–35.3% at 0–5 cm soil depth. Thus, NTS in double rice paddies has been proved to be a promising option to maintain high levels of soil C accumulation with low temporal variability, especially at the upper 0–5 cm depth.

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“…(Ordóñez-Fernández et al 2007) found that 53% of wheat straw was left after 109 days at a site in Mediterranean climate conditions, which is similar to the amount of straw left (51%) after 180 days in the study by (Li et al 2016). Thus, under such favourable conditions for C mineralisation, as found in the present study, decomposition and stabilisation of crop residue-derived C occurs very quickly.…”

Section: Long-term Effect Of Straw Addition On Soil Carbonsupporting

confidence: 87%

“…Similarly, Tiessen and Stewart (1983) found more rapid depletion of SOC in the fine clay fraction (<0.2 mm) than in the coarse clay (0.2-2 mm) and fine silt (2-5 mm) fractions after a land use change from native prairie to arable land. In an in situ incubation experiment, Li et al (2016) studied labelled residues mixed into mineral soil over two years and found that after 60 days, 61% of the applied residue C was left in the soil, with 75% of it still stored in particles >2000 mm and only 0.1% was stored in microaggregates <53 mm, which correspond to the SC fraction. After 780 days, 26% of the applied C was left in the soil, with only 39% of it stored in the >2000 mm particles and 2.4% stored in the SC fraction.…”

Section: Long-term Effect Of Straw Addition On Soil Carbonmentioning

confidence: 99%

Qualitative and quantitative response of soil organic carbon to 40 years of crop residue incorporation under contrasting nitrogen fertilisation regimes

et al. 2017

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Abstract.Crop residue incorporation (RI) is recommended to increase soil organic carbon (SOC) stocks. However, the positive effect on SOC is often reported to be relatively low and alternative use of crop residues, e.g. as a bioenergy source, may be more climate smart. In this context, it is important to understand: (i) the response of SOC stocks to long-term crop residue incorporation; and (ii) the qualitative SOC change, in order to judge the sustainability of this measure. We investigated the effect of 40 years of RI combined with five different nitrogen (N) fertilisation levels on SOC stocks and five SOC fractions differing in turnover times on a clay loam soil in Padua, Italy. The average increase in SOC stock in the 0-30 cm soil layer was 3.1 Mg ha -1 or 6.8%, with no difference between N fertilisation rates. Retention coefficients of residues did not exceed 4% and decreased significantly with increasing N rate (R 2 = 0.49). The effect of RI was higher after 20 years (4.6 Mg ha -1 ) than after 40 years, indicating that a new equilibrium has been reached and no further gains in SOC can be expected. Most (92%) of the total SOC was stored in the silt and clay fraction and 93% of the accumulated carbon was also found in this fraction, showing the importance of fine mineral particles for SOC storage, stabilisation and sequestration in arable soils. No change was detected in more labile fractions, indicating complete turnover of the annual residue-derived C in these fractions under a warm humid climate and in a highly base-saturated soil. The applied fractionation was thus useful to elucidate drivers and mechanisms of SOC formation and stabilisation. We conclude that residue incorporation is not a significant management practice affecting soil C storage in warm temperate climatic regions.

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Distribution and storage of crop residue carbon in aggregates and its contribution to organic carbon of soil with low fertility

Cited by 94 publications

References 53 publications

Effects of inorganic and organic amendment on soil chemical properties, enzyme activities, microbial community and soil quality in yellow clayey soil

Effects of inorganic and organic amendment on soil chemical properties, enzyme activities, microbial community and soil quality in yellow clayey soil

Temporal variability of soil organic carbon in paddies during 13‐year conservation tillage

Qualitative and quantitative response of soil organic carbon to 40 years of crop residue incorporation under contrasting nitrogen fertilisation regimes

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