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Effects of added organic matter and water on soil carbon sequestration in an arid region.

Lai L, Li Y, Tian Y, Jiang L, Zhao X, Zhu L, Chen X, Gao Y, Wang S, Zheng Y, Rimmington GM - PLoS ONE (2013)

Bottom Line: However, many studies have found that soil C does not necessarily increase with increased plant litter input.The FOM had a more significant stimulating effect on microbial biomass with water addition.We concluded that short-term FOM input into the belowground soil and water addition do not affect the SOC pool in shrubland in an arid region.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Resource Plants, Beijing Botanical Garden, West China Subalpine Botanical Garden, Institute of Botany, Chinese Academy of Sciences, Xiangshan, Beijing, China.

ABSTRACT
It is generally predicted that global warming will stimulate primary production and lead to more carbon (C) inputs to soil. However, many studies have found that soil C does not necessarily increase with increased plant litter input. Precipitation has increased in arid central Asia, and is predicted to increase more, so we tested the effects of adding fresh organic matter (FOM) and water on soil C sequestration in an arid region in northwest China. The results suggested that added FOM quickly decomposed and had minor effects on the soil organic carbon (SOC) pool to a depth of 30 cm. Both FOM and water addition had significant effects on the soil microbial biomass. The soil microbial biomass increased with added FOM, reached a maximum, and then declined as the FOM decomposed. The FOM had a more significant stimulating effect on microbial biomass with water addition. Under the soil moisture ranges used in this experiment (21.0%-29.7%), FOM input was more important than water addition in the soil C mineralization process. We concluded that short-term FOM input into the belowground soil and water addition do not affect the SOC pool in shrubland in an arid region.

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Related in: MedlinePlus

Effects of FOM and water addition on fine root biomass (mean±SE).Dots with different lowercase letters are significantly different from each other of fine root biomass in 0–60 cm soil layers in the different treatments at p<0.05 (Tukey Test). Other abbreviations are same as Figure 1.
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pone-0070224-g005: Effects of FOM and water addition on fine root biomass (mean±SE).Dots with different lowercase letters are significantly different from each other of fine root biomass in 0–60 cm soil layers in the different treatments at p<0.05 (Tukey Test). Other abbreviations are same as Figure 1.

Mentions: Fine root biomass between 0 and 60 cm deep ranged from 133.3±5.6 g/m2 in the F0P0 treatment to 170.8±3.4 g/m2 in the F2P2 treatment. There were few significant differences in fine root biomass between the treatments with no FOM inputs or no water addition (Figure 5). Under the P1 and P2 water addition regimes, increased FOM inputs caused significant increase of fine root biomass (Figure 6A). Similar results were found for water addition (Figure 6B). Water addition increased the root biomass much more than FOM input did (Figure 6).


Effects of added organic matter and water on soil carbon sequestration in an arid region.

Lai L, Li Y, Tian Y, Jiang L, Zhao X, Zhu L, Chen X, Gao Y, Wang S, Zheng Y, Rimmington GM - PLoS ONE (2013)

Effects of FOM and water addition on fine root biomass (mean±SE).Dots with different lowercase letters are significantly different from each other of fine root biomass in 0–60 cm soil layers in the different treatments at p<0.05 (Tukey Test). Other abbreviations are same as Figure 1.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3713057&req=5

pone-0070224-g005: Effects of FOM and water addition on fine root biomass (mean±SE).Dots with different lowercase letters are significantly different from each other of fine root biomass in 0–60 cm soil layers in the different treatments at p<0.05 (Tukey Test). Other abbreviations are same as Figure 1.
Mentions: Fine root biomass between 0 and 60 cm deep ranged from 133.3±5.6 g/m2 in the F0P0 treatment to 170.8±3.4 g/m2 in the F2P2 treatment. There were few significant differences in fine root biomass between the treatments with no FOM inputs or no water addition (Figure 5). Under the P1 and P2 water addition regimes, increased FOM inputs caused significant increase of fine root biomass (Figure 6A). Similar results were found for water addition (Figure 6B). Water addition increased the root biomass much more than FOM input did (Figure 6).

Bottom Line: However, many studies have found that soil C does not necessarily increase with increased plant litter input.The FOM had a more significant stimulating effect on microbial biomass with water addition.We concluded that short-term FOM input into the belowground soil and water addition do not affect the SOC pool in shrubland in an arid region.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Resource Plants, Beijing Botanical Garden, West China Subalpine Botanical Garden, Institute of Botany, Chinese Academy of Sciences, Xiangshan, Beijing, China.

ABSTRACT
It is generally predicted that global warming will stimulate primary production and lead to more carbon (C) inputs to soil. However, many studies have found that soil C does not necessarily increase with increased plant litter input. Precipitation has increased in arid central Asia, and is predicted to increase more, so we tested the effects of adding fresh organic matter (FOM) and water on soil C sequestration in an arid region in northwest China. The results suggested that added FOM quickly decomposed and had minor effects on the soil organic carbon (SOC) pool to a depth of 30 cm. Both FOM and water addition had significant effects on the soil microbial biomass. The soil microbial biomass increased with added FOM, reached a maximum, and then declined as the FOM decomposed. The FOM had a more significant stimulating effect on microbial biomass with water addition. Under the soil moisture ranges used in this experiment (21.0%-29.7%), FOM input was more important than water addition in the soil C mineralization process. We concluded that short-term FOM input into the belowground soil and water addition do not affect the SOC pool in shrubland in an arid region.

Show MeSH
Related in: MedlinePlus