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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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Seasonal dynamics (mean±SE) of microbial biomass carbon under different treatments.Other abbreviations are same as Figure 1.
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pone-0070224-g003: Seasonal dynamics (mean±SE) of microbial biomass carbon under different treatments.Other abbreviations are same as Figure 1.

Mentions: The FOM inputs, water addition, and their interactions had significant effects on the soil MBC (P<0.001, Table 2). The soil MBC content was at its highest at the start of the experiment, in June, and then declined with time. The soil MBC content was 4.6%–68% lower in the same treatment plots at the end of the experiment (October) than that at the beginning (Figure 3).


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)

Seasonal dynamics (mean±SE) of microbial biomass carbon under different treatments.Other abbreviations are same as Figure 1.
© Copyright Policy
Related In: Results  -  Collection

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

pone-0070224-g003: Seasonal dynamics (mean±SE) of microbial biomass carbon under different treatments.Other abbreviations are same as Figure 1.
Mentions: The FOM inputs, water addition, and their interactions had significant effects on the soil MBC (P<0.001, Table 2). The soil MBC content was at its highest at the start of the experiment, in June, and then declined with time. The soil MBC content was 4.6%–68% lower in the same treatment plots at the end of the experiment (October) than that at the beginning (Figure 3).

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