Effects of nitrogen deposition and drought on litter decomposition in a temperate forest

ZHENG Jun-qiang; GUO Rui-hong; LI Dong-sheng; LI Dong; LI Jin-gong; ZHU Bao-kun; HAN Shi-jie

doi:10.13332/j.1000-1522.20150464

Journal of Beijing Forestry University > 2016 > 38(4): 21-28. > DOI: 10.13332/j.1000-1522.20150464

ZHENG Jun-qiang, GUO Rui-hong, LI Dong-sheng, LI Dong, LI Jin-gong, ZHU Bao-kun, HAN Shi-jie. Effects of nitrogen deposition and drought on litter decomposition in a temperate forest[J]. Journal of Beijing Forestry University, 2016, 38(4): 21-28. DOI: 10.13332/j.1000-1522.20150464

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Effects of nitrogen deposition and drought on litter decomposition in a temperate forest

1.
1 Institute of Applied Ecology, Chinese Academy of Sciences, 110164, Shenyang, Liaoning, P. R. China;
2.
2 Liaoning Institute of Wetland, Panjin City,Liaoning, 124000, P.R. China;
3.
3 Changbai Mountain Natural Conservation Administration Centre, 133613,Yanbian, Jilin, P.R. China;
4.
4 School of Environment, Northeast Normal University, 130117,Changchun, Jilin, P.R. China.

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Received Date: December 03, 2015
Published Date: April 29, 2016

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Abstract

Abstract

To study the responses of nitrogen (N) deposition and drought on litter decomposition, we conducted an in situ experiment in a broadleaf-Korean pine mixed forest in Changbai Mountains by using litterbag technique. Four treatments were installed, i.e., null level of N (CK), N addition (N, 50 kg N/(ha·a)), precipitation reduction (RP, -30%) and precipitation reduction combined with N addition (RP+N). The results showed that it would take 6.025 to 15.167 years to decompose 95% of mass of litter used. Among the tree species, Tilia amurensis (TA) had the highest decomposition rate, followed by Quercus mongolica (MQ), and Pinus koraiensis (PK) showed the lowest decomposition rate. After 92 d and 154 d, although the litter decomposition rate with N addition was higher than those with CK, no significant difference was found, whereas the decomposition rate of litter in RP and RP+N treatments was significantly lower than that of CK (P<, 0.05). But after 365 d and 457 d, the differences between RP, RP+N and CK were also significant. Compared with CK, N and drought treatments had a 42.64%-51.01% decrease of litter C/N ratio. As a whole, N deposition had no significant effects on litter decomposition and C and N concentration, but RP and RP+N significantly inhibited the litter decomposition, and C and N release.
- nitrogen deposition,
- reduce precipitation,
- litter decomposition,
- C and N,
- C/N ratio,
- broadleaf-Korean pine mixed forest,
- Changbai Mountains

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References

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