Effect of Improved Management Practices on Soil Organic Carbon Sequestration in Wheat-maize Double Cropping System in North China

Abstract

Carbon sequestration in cropland soils which could be achieved through improved management practices (IPMs) represents an important opportunity to offset a portion of greenhouse gas emissions. North China is the main wheat and maize production region where many IMPs have been widely used during the last several decades, but the effect size and duration of IMPs on soil organic carbon (SOC) sequestration in wheat-maize double cropping system in this region is scarcely studied. In this study, a meta-analysis was conducted to compare the effect size and duration of four IMPs on SOC sequestration in wheat-maize double cropping system in north China. A total of 29 long-term experiments, consisting of 119 paired treatments were compiled in this analysis. The results indicated that the four IMPs of organic manure application (OM), organic manure combined with chemical fertilizer application (MF), straw return (SR) and reduced or no tillage (RNT) all had significant effects on SOC sequestration in the study area. On average, the IMPs of OM, MF, SR and RNT enhanced SOC density by 260, 328, 278 and 134 kg ha -1 yr -1 , respectively. The effect duration of OM, MF, SR and RNT on SOC sequestration were about 48, 26, 22 and 18 years, respectively. Accumulation enhancements of SOC for OM, MF, SR and RNT over SOC sequestration period were about 34.7%, 36.1%, 22.0% and 12.7%, respectively. OM and MF could be the appropriate practices on SOC sequestration in wheat-maize double cropping system in the research area.

Effect of different fertilization modes on soil organic carbon sequestration in paddy fields in South China: A meta-analysis

“…Among the inorganic fertilization modes (N, NP, and NPK), the RAC under NPK was the highest, consistent with the research results concluded by Wang et al (2002), possibly because the crop yield and the amount of crop residue under NPK were higher than those under the N and NP treatments (Bhattacharyya et al, 2009). Under organic fertilization circumstances (O and OF), the RAC under the OF treatment was significantly higher than that under O, which was similar to the result determined by Zhu et al (2012). An explanation would be that the addition of manure to chemical fertilizer could promote the formation of micro-aggregates in macro-aggregates, leading to more particulate organic matter fixation in the newly formed micro-aggregates (Six et al, 1999).…”

Effect of different fertilization modes on soil organic carbon sequestration in acid soils

“…Incorporation of alternative organic fertilizers in unlimed soil showed negative effects (−0.39 and −0.66 g kg −1 yr −1 ) in the observed long-term experiment. The RAC in the limed soil with incorporated organic fertilizers (FYM and alternative organic fertilizers) varied from 0.25 g kg −1 yr −1 in the treatment with incorporated alternative organic fertilizers (in the manure background (40 t ha −1 )) to 0.71 g kg −1 yr −1 in the soil with FYM (60 t ha −1 ), which was similar to the result determined by Zhu et al (2012). It is worth to note that a higher C addition with manure produced significant increase of sequestrated C. An explanation would be that the addition of FYM with mineral 5.9* 0.00* 1.17* 146.0 116.0* (9) Limed + FYM (60 t ha −1 ) 6.1* 0.00* 1.43* 220.5* 151.3* (10) Limed + alternative organic fertilizers (in 60 t ha −1 FYM background) 5.9* 0.00* 1.28* 161.7* 123.3* *Differences significant at 95% probability level.…”

Efficacy of Integrated Straw Formulations on Lowland Rice Field Organic Carbon and Greenhouse Gas Emissions Using CCAFS-MOT Model in Niger State, Nigeria

“…Similarly, between 5 -15 cm, the highest input in carbon was obtained with T4 (0.4) followed by T2 (0.3) and a set of treatments T1, T3, T5, T6, T7, T8 and T9 with the same significance on carbon input but significantly different from the control C in terms of soil carbon gained per month. Results from this short-term experiment, coincide with [31] on the effects of time on improved management practices carbon sequestration. In fact, carbon input from crop residues duration is synonymous with the time to which soil carbon steady state is reached.…”