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Controlling Factors of Soil CO2 Efflux in Pinus yunnanensis across Different Stand Ages.

Wang S, Zhao J, Chen Q - PLoS ONE (2015)

Bottom Line: No consistent tendency was found on the change of Rs with the stand ages.In addition, we found that pH, available nitrogen (AN), C/N and total phosphorus (TP) contributed significantly to the seasonal variation of Rs.The results indicated that besides soil water, soil properties (e. g. pH, AN, C/N and TP) were also the important in controlling the temporal variations of Rs across different stand ages in the nature forestry.

View Article: PubMed Central - PubMed

Affiliation: Department of Environmental Science and Engineering, Southwest Forestry University, Kunming, Bailongshi, China.

ABSTRACT
The characteristics of soil respiration (Rs) across different stand ages have not been well investigated. In this study, we identified temporal variation of Rs and its driving factors under three nature forest stands (e.g. 15-yr-old, 30-yr-old, and 45-yr-old) of Pinus yunnanensis in the Plateau of Mid-Yunnan, China. No consistent tendency was found on the change of Rs with the stand ages. Rs was ranked in the order of 30-yr-old > 45-yr-old >15-yr-old. Rs in 15-yr-old stand was the most sensitive to soil temperature (Ts) among the three sites. However, Ts only explained 30-40% of the seasonal dynamics of Rs at the site. Soil water content (Sw) was the major controlling factor of temporal variation at the three sites. Sw explained 88-93% of seasonal variations of Rs in the 30-yr-old stand, and 63.7-72.7% in the 15-yr-old and 79.1-79.6% in the 45-yr-old stands. In addition, we found that pH, available nitrogen (AN), C/N and total phosphorus (TP) contributed significantly to the seasonal variation of Rs. Sw was significantly related with pH, total nitrogen (TN), AN and TP, suggesting that Sw can affect Rs through improving soil acid-base property and soil texture, and increasing availability of soil nutrient. The results indicated that besides soil water, soil properties (e. g. pH, AN, C/N and TP) were also the important in controlling the temporal variations of Rs across different stand ages in the nature forestry.

No MeSH data available.


Soil physicochemical characteristics (A: SOM, AN and C/N; B: TN, TP and pH) across the three stand ages.
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pone.0127274.g003: Soil physicochemical characteristics (A: SOM, AN and C/N; B: TN, TP and pH) across the three stand ages.

Mentions: The significant correlations were detected among Rs, Ts and Sw, which explain much of the temporal variation of Rs at the sites of 15-, 30-, and 45-yr-old. We also identified the correlations between some soil physicochemical properties and seasonal variation of Rs. Rs in the 30- yr-old stand was the highest, which coincided with higher soil C and N among the three sites (Fig 3). Rs was also found to be positively correlated with pH (p<0.05), AN (p<0.05) and TP (p<0.01) at the three sites (Table 5). In contrast, negative correlation was detected between Rs and C/N (p<0.01). No significant correlations were found between the mean Rs, and SOM and TN. Sw was significantly related with pH, TN, AN and TP, suggesting that higher Sw may pay crucial influences on RS through its influences on these soil physicochemical properties.


Controlling Factors of Soil CO2 Efflux in Pinus yunnanensis across Different Stand Ages.

Wang S, Zhao J, Chen Q - PLoS ONE (2015)

Soil physicochemical characteristics (A: SOM, AN and C/N; B: TN, TP and pH) across the three stand ages.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4440811&req=5

pone.0127274.g003: Soil physicochemical characteristics (A: SOM, AN and C/N; B: TN, TP and pH) across the three stand ages.
Mentions: The significant correlations were detected among Rs, Ts and Sw, which explain much of the temporal variation of Rs at the sites of 15-, 30-, and 45-yr-old. We also identified the correlations between some soil physicochemical properties and seasonal variation of Rs. Rs in the 30- yr-old stand was the highest, which coincided with higher soil C and N among the three sites (Fig 3). Rs was also found to be positively correlated with pH (p<0.05), AN (p<0.05) and TP (p<0.01) at the three sites (Table 5). In contrast, negative correlation was detected between Rs and C/N (p<0.01). No significant correlations were found between the mean Rs, and SOM and TN. Sw was significantly related with pH, TN, AN and TP, suggesting that higher Sw may pay crucial influences on RS through its influences on these soil physicochemical properties.

Bottom Line: No consistent tendency was found on the change of Rs with the stand ages.In addition, we found that pH, available nitrogen (AN), C/N and total phosphorus (TP) contributed significantly to the seasonal variation of Rs.The results indicated that besides soil water, soil properties (e. g. pH, AN, C/N and TP) were also the important in controlling the temporal variations of Rs across different stand ages in the nature forestry.

View Article: PubMed Central - PubMed

Affiliation: Department of Environmental Science and Engineering, Southwest Forestry University, Kunming, Bailongshi, China.

ABSTRACT
The characteristics of soil respiration (Rs) across different stand ages have not been well investigated. In this study, we identified temporal variation of Rs and its driving factors under three nature forest stands (e.g. 15-yr-old, 30-yr-old, and 45-yr-old) of Pinus yunnanensis in the Plateau of Mid-Yunnan, China. No consistent tendency was found on the change of Rs with the stand ages. Rs was ranked in the order of 30-yr-old > 45-yr-old >15-yr-old. Rs in 15-yr-old stand was the most sensitive to soil temperature (Ts) among the three sites. However, Ts only explained 30-40% of the seasonal dynamics of Rs at the site. Soil water content (Sw) was the major controlling factor of temporal variation at the three sites. Sw explained 88-93% of seasonal variations of Rs in the 30-yr-old stand, and 63.7-72.7% in the 15-yr-old and 79.1-79.6% in the 45-yr-old stands. In addition, we found that pH, available nitrogen (AN), C/N and total phosphorus (TP) contributed significantly to the seasonal variation of Rs. Sw was significantly related with pH, total nitrogen (TN), AN and TP, suggesting that Sw can affect Rs through improving soil acid-base property and soil texture, and increasing availability of soil nutrient. The results indicated that besides soil water, soil properties (e. g. pH, AN, C/N and TP) were also the important in controlling the temporal variations of Rs across different stand ages in the nature forestry.

No MeSH data available.