Carbon and nitrogen contents of different-sized light fraction organic matter as influenced by tillage and residue management

Soon, Y. K.; Haq, Ansar ul; Arshad, Muhammad

doi:10.4141/cjss08065

Cited by 8 publications

(6 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The result that F1 percentage in M treatment in our study (51%) was significantly higher than other treatments also confirmed his view and indicated that application of manure fertilizer could increase F1 fraction (Bhattacharyya et al, 2011). While F1 percentage decreased in NP treatment, the reason was that crop under this treatment grew fast and consumed lots of labile matter, without exogenous labile matter input, and then its F1 fraction decreased somehow (Soon et al, 2009). Majumder et al (2008) reported that F1 was highly correlated with the production of corn and rice and concluded that F1 could be considered as a good indicator of the sustainability of a crop system.…”

Section: Ooc Fractionssupporting

confidence: 85%

Effects of long-term fertilization on oxidizable organic carbon fractions on the Loess Plateau, China

2016

View full text Add to dashboard Cite

The effects of long-term fertilization on pools of soil organic carbon (SOC) have been well studied, but limited information is available on the oxidizable organic carbon (OOC) fractions, especially for the Loess Plateau in China. We evaluated the effects of a 15-year fertilization on the OOC fractions (F1, F2, F3 and F4) in the 0-20 and 20-40 cm soil layers in flat farmland under nine treatments (N (nitrogen, urea), P (phosphorus, monocalcium phosphate), M (organic fertilizer, composted sheep manure), N+P (NP), M+N (MN), M+P (MP), M+N+P (MNP), CK (control, no fertilizer) and bare land (BL, no crops or fertilizer)). SOC content increased more markedly in the treatment containing manure than in those with inorganic fertilizers alone. F1, F2, F4 and F3 accounted for 47%, 27%, 18% and 8% of total organic carbon, respectively. F1 was a more sensitive index than the other C fractions in the sensitivity index (SI) analysis. F1 and F2 were highly correlated with total nitrogen (TN) and available nitrogen (AN), F3 was negatively correlated with pH and F4 was correlated with TN. A cluster analysis showed that the treatments containing manure formed one group, and the other treatments formed another group, which indicated the different effects of fertilization on soil properties. Long-term fertilization with inorganic fertilizer increased the F4 fraction while manure fertilizer not only increased labile fractions (F1) in a short time, but also increased passive fraction (F4) over a longer term. The mixed fertilizer mainly affected F3 fraction. The study demonstrated that manure fertilizer was recommended to use in the farmland on the Loess Plateau for the long-term sustainability of agriculture.

show abstract

Section: Ooc Fractionssupporting

confidence: 85%

Effects of long-term fertilization on oxidizable organic carbon fractions on the Loess Plateau, China

2016

View full text Add to dashboard Cite

show abstract

“…Even a slight change in environmental conditions may affect soil respiration rates in agricultural ecosystems, especially an increasing soil temperature resulting from the global warming which could lead to a potential alteration of the carbon balance between terrestrial ecosystems and atmosphere (Du et al 2010;Soon et al 2009;Smith, 2005;Gaumont-Guay et al 2006). Soil respiration consists of functionally different components, root respiration (autotrophic respiration) and soil organic carbon (SOC) decomposition (heterotrophic respiration), which react differently to changes in environmental conditions, implying different spatial and temporal variations (Kuzyakov and Larionova 2005;Michelsen et al 2004;Takahashi et al 2004).…”

mentioning

confidence: 99%

Contrasting diurnal variations in soil organic carbon decomposition and root respiration due to a hysteresis effect with soil temperature in a Gossypium s. (cotton) plantation

Wang

Zhang

et al. 2011

Plant Soil

View full text Add to dashboard Cite

To understand the characteristics of the diurnal variation in soil respiration and its response to temperature, we used root exclusion plots, and buried CO 2 sensors in situ during the late growing season in northwestern China. Soil organic carbon (SOC) decomposition and root respiration dynamics were quantified. In our study, we found that the diurnal variations in root respiration and soil organic carbon (SOC) decomposition showed a contrasting diurnal pattern. SOC decomposition peaked in the afternoon and was in phase with an increase in soil temperature at 10 cm; whereas root respiration decreased from 08:00-09:00 and was minimal at~17:00-18:00 despite an increase in soil temperature. Furthermore, an exponential function explained the diurnal variation in total soil respiration and SOC decomposition (r 2 > 0.6, n=504), but not so for root respiration (r 2 < 0.3, n = 504). The fitted Q 10 value of 4.3 for SOC decomposition was significantly higher than the Q 10 value of 3.1 for root respiration. This result suggested that the root respiration rate had a different temperature sensitivity to the microbial respiration rate. In addition, we observed a significant (p<0.001) clockwise hysteretic effect for SOC decomposition with respect to soil temperature at 10 cm over a 24 h period, with higher rates when soil temperature was increasing and lower rates when soil temperature was decreasing. By contrast, the diurnal hysteresis in root respiration with soil temperature at 10 cm was always counterclockwise, with lower rates when soil temperature was increasing than when soil temperature was decreasing. This study emphasizes that root respiration and SOC decomposition have different responses to changing soil temperature. Therefore, modeling the impact of global climate change on soil carbon efflux should consider simultaneously, but separately, the impact of the two components.

show abstract

“…There were no significant differences in C-LF between treatments at 0-10 cm soil depth, but the values of C-LF at 10-40 cm soil depths were significantly greater for MC soil compared with GG (P<0.05). It was reported that cellulose is preferentially utilized in the early stages of plant residue decomposition, so plant residue decomposition in soils proceeds initially through loss of C (Soon et al, 2009). In grassland, fresh root C inputs and other organic residues are often accumulated at the soil surface (Yang et al, 2009); while in cropland, C-rich organic residues derived from manure (Röm-kens, 1999) and crops were plowed to a deeper soil depth (about 20 cm) (Don et al, 2011), enhancing vertical transport of organic matter (even to an 80-cm depth) (Römkens, 1999), which probably resulted in the higher C-LF in 10-40 cm soil depths in MC than that in GG .…”

Section: Carbon Concentrations In Light-and Heavyfractionsmentioning

confidence: 99%

Conventional tillage improves the storage of soil organic carbon in heavy fractions in the Loess Plateau, China

Han

Niu

et al. 2015

J. Arid Land

View full text Add to dashboard Cite

Soil labile organic carbon (C) plays an important role in improving soil quality. The relatively stable fractions of soil organic C (SOC) represent the bulk of SOC, and are also the primary determinant of the long-term C balance of terrestrial ecosystems. Different land use types can influence the distribution patterns of different SOC fractions. However, the underlying mechanisms are not well understood. In the present study, different fractions of SOC were determined in two land use types: a grazed grassland (established on previously cultivated cropland 25 years ago, GG) and a long-term cultivated millet cropland (MC). The results showed that C concentration and C storage of light fractions (LF) and heavy fractions (HF) presented different patterns along the soil profiles in the two sites. More plant residues in GG resulted in 91.9% higher LF storage at the 0-10 cm soil depth, further contributed to 21.9% higher SOC storage at this soil depth; SOC storage at 20-60 cm soil depth in MC was 98.8% higher than that in GG, which could be mainly attributed to the HF storage 104.5% higher than in GG. This might be caused by the long-term application of organic manure, as well as the protection from plough pan and silt-and clay-sized particles. The study indicated that different soil management practices in this region can greatly influence the variations of different SOC fractions, while the conventional tillage can greatly improve the storage of SOC by increasing heavy fractions.

show abstract

Carbon and nitrogen contents of different-sized light fraction organic matter as influenced by tillage and residue management

Cited by 8 publications

References 18 publications

Effects of long-term fertilization on oxidizable organic carbon fractions on the Loess Plateau, China

Effects of long-term fertilization on oxidizable organic carbon fractions on the Loess Plateau, China

Contrasting diurnal variations in soil organic carbon decomposition and root respiration due to a hysteresis effect with soil temperature in a Gossypium s. (cotton) plantation

Conventional tillage improves the storage of soil organic carbon in heavy fractions in the Loess Plateau, China

Contact Info

Product

Resources

About