Short-term dynamics of carbon and nitrogen after tillage in a freshwater marsh of northeast China

Zhang, Jinbo; Song, Changchun; Wang, Shenmin

doi:10.1016/j.still.2008.01.010

Cited by 21 publications

(14 citation statements)

References 17 publications

(35 reference statements)

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“…There are few studies that have looked at short-term changes in water-extractable C immediately after tillage of grasslands or croplands. Where studies have been performed, authors observed no change in CWEOC concentrations immediately after tillage of grassland (Zhang et al, 2008) or cropland (Geisseler and Horwath, 2009;Melero et al, 2009), whereas others reported temporary increases following tillage (Chantigny, 2003;Gregorich et al, 2000). However, these previous studies are not directly comparable as they looked at different tillage methods (e.g.…”

Section: Resultsmentioning

confidence: 97%

Soil soluble carbon dynamics of manured and unmanured grasslands following chemical kill and ploughing

et al. 2011

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Section: Resultsmentioning

confidence: 97%

Soil soluble carbon dynamics of manured and unmanured grasslands following chemical kill and ploughing

et al. 2011

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“…Much work has been completed concerning the concentration and bioavailability of soil dissolved organic carbon from wetland ecosystems in the Sanjiang Plain (Zhang et al, 2005;Zhang et al, 2008;Guo et al, 2010), yet rare information is available about how the dynamics of DOC are derived from surface ponds in wetland ecosystems of the Sanjiang Plain (Wang et al, 2010;Song et al, 2011). In this study we determined that the averaged DOC value was 23.25 mg L −1 for the surface ponds at the five natural wetland sites in the Sanjiang Plain during the two-year samplings.…”

Section: Comparisons With Other Studiesmentioning

confidence: 99%

Dissolved organic carbon characteristics in surface ponds from contrasting wetland ecosystems: a case study in the Sanjiang Plain, Northeast China

Wang

Song

Yang

2013

Hydrol. Earth Syst. Sci.

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Abstract. Dissolved organic carbon (DOC) is a significant component of carbon and nutrient cycling in fluvial ecosystems. Natural wetlands, as important DOC sources for river and ocean ecosystems, have experienced extensive natural and anthropogenic disturbances such as climate change, hydrological variations and land use change in recent years. The DOC characteristics in surface ponds from contrasting wetlands in the Sanjiang Plain, Northeastern China were investigated. Surface ponds at seven sites (two natural phialiform wetlands, three natural riparian wetlands, one degraded wetland and one artificial wetland, i.e., rice paddy) were monitored during the growing seasons of 2009 and 2010. The results show that the surface ponds at the five natural wetland sites exhibited a wide range of DOC concentrations (10.06-48.73 mg L −1 ) during the study period. The DOC concentrations showed no annual differences (P > 0.05) at all the wetland sites, except one of the phialiform wetland sites. The two phialiform wetlands exhibited higher DOC concentrations than the three riparian wetlands (P < 0.05). The DOC concentration in the surface pond at the artificial wetland site was relatively low (P < 0.05) compared to that at the degraded wetland site. The C/C ratios (the color per carbon unit ratio, Abs 400 /DOC concentration) showed inconsistent variations among these seven wetland sites, while the E4/E6 ratio (Abs 465 /Abs 665 , fulvic acid/humic acid) from the surface pond in the rice paddy land exerted 42.07-55.36 % reductions (P < 0.05), compared to those at the five natural wetland sites. Furthermore, the E4/E6 ratio in the surface pond at the rice paddy site was significantly lower compared to that at the degraded wetland site (P < 0.05), which indicated that disturbance to wetland DOC in surface ponds might be stronger when natural wetlands were converted to rice paddies in comparison with wetland degradation. This study could not only provide insightful points for understanding the aquatic DOC dynamics from different wetland ecosystems, but also support data information for incorporating the aquatic DOC into the model for regional carbon budgets in the future.

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“…Similar investigations have been conducted in China. Zhang et al (2008) reported that SCE peaked at 0.25 h after tillage in a cultivated field in northeast China, while Li et al (2010) reported that SCE increased after tillage and was maintained at relatively high levels for 2 weeks in rice fields in central China. However, there is little information available regarding the seasonal pattern of SCE in areas subjected to tillage.…”

Section: Introductionmentioning

confidence: 99%

Seasonal dynamics of soil CO₂ efflux in a conventional tilled wheat field of the Loess Plateau, China

Zhang¹,

Zhou²,

Lü³

et al. 2011

Ecological Research

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An automated chamber system was employed to measure the soil CO 2 efflux (SCE) in situ for 2 years in a conventional wheat field of the Loess Plateau, China under semi-arid conditions. The annual mean SCE values were 2.44 ± 2.52 lmol m À2 s À1 in 2006 and 2.37 ± 2.33 lmol m À2 s À1 in 2007. Distinct seasonality in the SCE was observed, with significant differences occurring among four periods divided by harvesting, tillage and sowing. In the period from tillage to sowing, the mean SCE values were 2.82 and 2.69 times the annual mean values in 2006 and 2007, respectively, and SCE accounted for 39% and 48% of the annual total within 14% and 18% of the days of the years. Although there were significant exponential correlations between the SCE and soil temperature, and significant linear correlations between the SCE and soil moisture for measurements conducted in the periods before tillage and after sowing each year, the SCE from tillage to sowing was significantly beyond the correlation curves. These findings indicated that seasonal variation in the SCE in a conventional field was controlled not only by soil temperature and moisture, but also by tillage practice. The confounding effects of climate and practice on SCE should be considered when developing ways to mitigate soil carbon loss in conventional cropland in semi-arid regions.

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Short-term dynamics of carbon and nitrogen after tillage in a freshwater marsh of northeast China

Cited by 21 publications

References 17 publications

Soil soluble carbon dynamics of manured and unmanured grasslands following chemical kill and ploughing

Soil soluble carbon dynamics of manured and unmanured grasslands following chemical kill and ploughing

Dissolved organic carbon characteristics in surface ponds from contrasting wetland ecosystems: a case study in the Sanjiang Plain, Northeast China

Seasonal dynamics of soil CO₂ efflux in a conventional tilled wheat field of the Loess Plateau, China

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Short-term dynamics of carbon and nitrogen after tillage in a freshwater marsh of northeast China

Cited by 21 publications

References 17 publications

Soil soluble carbon dynamics of manured and unmanured grasslands following chemical kill and ploughing

Soil soluble carbon dynamics of manured and unmanured grasslands following chemical kill and ploughing

Dissolved organic carbon characteristics in surface ponds from contrasting wetland ecosystems: a case study in the Sanjiang Plain, Northeast China

Seasonal dynamics of soil CO2 efflux in a conventional tilled wheat field of the Loess Plateau, China

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Seasonal dynamics of soil CO₂ efflux in a conventional tilled wheat field of the Loess Plateau, China