起始时间对亚热带森林凋落物分解速率的影响

doi:10.3724/SP.J.1258.2011.00699

摘要/Abstract

摘要：

运用分解袋法研究了不同布置时间的凋落物在亚热带森林分解的初期过程, 探讨了不同布置时间的凋落物经过相同时间分解的差异及环境因子对其分解速率特别是分解速率常数k的影响。结果表明: 在凋落物分解较快的鼎湖山季风常绿阔叶林, 不同时间布置的凋落物经过12个月的分解, 其残留率及k均存在较大的差异。不同布置时间的凋落物的分解率在前期(0-6个月)与其相应阶段的环境因子呈显著相关关系, 但与后期的环境因子相关性并不显著。不同布置时间的k值的变化范围为0.78-1.30, 起始于雨季的k值较大, 起始于旱季的较小(p < 0.001), 其大小与分解前期的环境因子相关性较高, 与整个分解过程中的环境因子相关性较低。因此, 凋落物的凋落时间可能影响其分解速率; 由于布置时间不同而导致k值估算的不准确将对森林生态系统的养分循环及其碳平衡的评估产生很大影响。

关键词: 环境因子, 布置时间, 凋落物分解速率常数k, 凋落物分解, 亚热带森林

Abstract:

Aims Estimation of ecosystem carbon balance may be affected by timing of sampling. Our objective was to determine the effect of different incubation starting times on litter decomposition rate (k) in a tropical and subtropical forest.
Methods We used litter bags and incubated them in the field at the same site beginning on eight different starting times over a year, beginning January 13 and at 45-day intervals. Each of the eight sets of litter bags was sampled four times over a period of 12 months, remaining litter mass was determined and k values were estimated. Temperature, precipitation, photosynthetically available radiation, soil water content and relative humidity were measured throughout the experiment.
Important findings The remaining litter mass and k values were significantly different (p < 0.05) among the eight starting times. Rate of litter decomposition was significantly (p < 0.05) correlated to temperature and precipitation during the early phase rather than the later phase of the experiment. The k values ranged from 0.78 to 1.30, and were significantly higher (p < 0.001) for litter whose incubation started in the wet seasons as compared to the dry seasons. Therefore, time for the start of incubation may significantly influence estimation of k values, which in turn may influence estimation of ecosystem carbon balance.

Key words: environment factor, incubation time, litter decomposition constant k, litter decomposition, subtropical forest

李荣华, 邓琦, 周国逸, 张德强. 起始时间对亚热带森林凋落物分解速率的影响. 植物生态学报, 2011, 35(7): 699-706. DOI: 10.3724/SP.J.1258.2011.00699

LI Rong-Hua, DENG Qi, ZHOU Guo-Yi, ZHANG De-Qiang. Effect of incubation starting time on litter decomposition rate in a subtropical forest in China. Chinese Journal of Plant Ecology, 2011, 35(7): 699-706. DOI: 10.3724/SP.J.1258.2011.00699

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https://www.plant-ecology.com/CN/Y2011/V35/I7/699

图/表 5

参考文献 32

[1]	Adair EC, Hobbie SE, Hobbie RK (2010). Single-pool exponential decomposition models: potential pitfalls in their use in ecological studies. Ecology, 91, 1225-1236. DOI URL PMID
[2]	Adair EC, Parton WJ, Del Grosso SJ, Silver WL, Harmon ME, Hall SA, Burke IC, Hart SC (2008). Simple three-pool model accurately describes patterns of long-term litter decomposition in diverse climates. Global Change Biology, 14, 2636-2660.
[3]	Aerts R (1997). Climate, leaf litter chemistry and leaf litter decomposition in terrestrial ecosystems: a triangular relationship. Oikos, 79, 439-449.
[4]	Berg B (2000). Litter decomposition and organic turnover in northern forest soils. Forest Ecology and Management, 133, 13-22.
[5]	Berg B, Johansson MB, Meentemeyer V (2000). Litter decomposition in a transect of Norway spruce forests: substrate quality and climate control. Canadian Journal of Forest Research, 30, 1136-1147.
[6]	Chapin FS III, Matson PA, Mooney HA (2002). Principal of Terrestrial Ecosystem Ecology. Springer-Verlag, New York. 151.
[7]	Finzi AC, Schlesinger WH (2002). Species control variation in litter decomposition in a pine forest exposed to elevated CO₂. Global Change Biology, 8, 1217-1229.
[8]	Gholz HL, Wedin DA, Smitherman SM, Harmon ME, Parton WJ (2000). Long-term dynamics of pine and hardwood litter in contrasting environments: toward a global model of decomposition. Global Change Biology, 6, 751-765.
[9]	Guan LL (官丽莉), Zhou GY (周国逸), Zhang DQ (张德强), Liu JX (刘菊秀), Zhang QM (张倩媚) (2004). Twenty years of litter fall dynamics in subtropical evergreen broad-leaved forests at the Dinghushan Forest Ecosystem Research Station. Acta Phytoecologica Sinica (植物生态学报), 28, 449-456. (in Chinese with English abstract)
[10]	Huang YH, Li YL, Xiao Y, Wenigmann KO, Zhou GY, Zhang DQ, Wenigmann M, Tang XL, Liu JX (2011). Controls of litter quality on the carbon sink in soils through partitioning the products of decomposing litter in a forest succession series in South China. Forest Ecology and Management, 261, 1170-1177.
[11]	Ju WM, Chen JM, Black TA, Barr AG, Liu J, Chen BZ (2006). Modelling multi-year coupled carbon and water fluxes in a boreal aspen forest. Agricultural and Forest Meteorology, 140, 136-151.
[12]	Kumada S, Kawanishi T, Hayashi Y, Ogomori K, Kobayashi Y, Takahashi N, Saito M, Hamano H, Kojima T, Yamada K (2008). Litter carbon dynamics analysis in forests in an arid ecosystem with a model incorporating the physical removal of litter. Ecological Modelling, 215, 190-199.
[13]	Liu Q (刘强), Peng SL (彭少麟) (2010). Plant Litter Ecology (植物凋落物生态学). Science Press, Beijing. 43. (in Chinese)
[14]	Liu Q (刘强), Peng SL (彭少麟), Bi H (毕华), Zhang HY (张洪溢), Li ZA (李志安), Ma WH (马文辉), Li NY (李妮亚) (2005). Nutrient dynamics of foliar litter in reciprocal decomposition in tropical and subtropical forests. Journal of Beijing Forestry University (北京林业大学学报), 27(1), 24-32. (in Chinese with English abstract)
[15]	Liu ZW (刘增文), Gao WJ (高文俊), Pan KW (潘开文), Du HX (杜红霞), Zhang LP (张丽萍) (2006). Discussion on the study methods and models of litter decomposition. Acta Ecologica Sinica (生态学报), 26, 1993-2000. (in Chinese with English abstract)
[16]	Manzoni S, Porporato A (2009). Soil carbon and nitrogen mineralization: theory and models across scales. Soil Biology & Biochemistry, 41, 1355-1379.
[17]	Nagy MT, Janssens IA, Yuste JC, Carrara A, Ceulemans R (2006). Footprint-adjusted net ecosystem CO₂ exchange and carbon balance components of a temperate forest. Agricultural and Forest Meteorology, 139, 344-360.
[18]	Olson JS (1963). Energy storage and the balance of producers and decomposers in ecological systems. Ecology, 44, 322-331.
[19]	Osono T, One Y, Takeda H (2003). Fungal ingrowth on forest floor and decomposing needle litter of Chamaecyparis obtusa in relation to resource availability and moisture condition. Soil Biology & Biochemistry, 35, 1423-1431.
[20]	Parton WJ, Schimel DS, Cole CV, Ojima DS (1987). Analysis of factors controlling soil organic matter levels in Great Plains grasslands. Soil Science Society of America Journal, 51, 1173-1179.
[21]	Prescott CE (2005). Do rates of litter decomposition tell us anything we really need to know? Forest Ecology and Management, 220, 66-74.
[22]	Raich JW, Schlesinger WH (1992). The global carbon dioxide flux in soil respiration and its relationship to vegetation and climate. Tellus B, 44, 81-99.
[23]	Shen HL (沈海龙), Ding BY (丁宝永), Shen GF (沈国舫), Chen AM (陈爱民) (1996). Decomposing dynamics of several coniferous and broadleaved litters in Mongolian Scots pine plantation. Scientia Silvae Sinicae (林业科学), 32, 393-402. (in Chinese with English abstract)
[24]	Song XZ (宋新章), Jiang H (江洪), Ma YD (马元丹), Yu SQ (余树全), Zhou GM (周国模), Peng SL (彭少麟), Dou RP (窦荣鹏), Guo PP (郭培培) (2009a). Litter decomposition across climate zone in Eastern China: the integrated influence of climate and litter quality. Acta Ecologica Sinica (生态学报), 29, 5219-5226. (in Chinese with English abstract)
[25]	Song XZ (宋新章), Jiang H (江洪), Yu SQ (余树全), Ma YD (马元丹), Zhou GM (周国模), Dou RP (窦荣鹏), Guo PP (郭培培) (2009b). Litter decomposition of dominant plant species in successional stages in mid-subtropical zone. Chinese Journal of Applied Ecology (应用生态学报), 20, 537-542. (in Chinese with English abstract)
[26]	Vitousek PM, Turner DR, Parton WJ, Sanford RL (1994). Litter decomposition on the Mauna Loa environmental matrix, Hawai’i: patterns, mechanisms, and models. Ecology, 75, 418-429.
[27]	Wang J (王瑾), Huang JH (黄建辉) (2001). Comparison of major nutrient release patterns in leaf litter decomposition in warm temperate zone of China. Acta Phytoecologica Sinica (植物生态学报), 25, 375-380. (in Chinese with English abstract)
[28]	Zhang CF, Meng FR, Bhatti JS, Trofymow JA, Arp PA (2008a). Modeling forest leaf-litter decomposition and N mineralization in litterbags, placed across Canada: a 5-model comparison. Ecological Modelling, 219, 342-360.
[29]	Zhang DQ, Hui DF, Luo YQ, Zhou GY (2008b). Rates of litter decomposition in terrestrial ecosystems: global patterns and controlling factors. Journal of Plant Ecology, 1, 85-93.
[30]	Zhang DQ (张德强), Ye WH (叶万辉), Yu QF (余清发), Kong GH (孔国辉), Zhang YC (张佑倡) (2000). The litter-fall of representative forests of successional series in Dinghushan. Acta Ecologica Sinica (生态学报), 20, 938-944. (in Chinese with English abstract)
[31]	Zhang DQ (张德强), Yu QF (余清发), Kong GH (孔国辉), Zhang YC (张佑倡) (1998). Chemical properties of forest floor litter in Dinghushan monsoon evergreen broadleaved forest. Acta Ecologica Sinica (生态学报), 18, 96-100. (in Chinese with English abstract)
[32]	Zhou GY, Guan LL, Wei XH, Tang XL, Liu SG, Liu JX, Zhang DQ, Yan JH (2008). Factors influencing leaf litter decomposition: an intersite decomposition experiment across China. Plant Soil, 311, 61-72.

	分解时段 Incubated period	气温 Air temperature	相对湿度 Relative humidity	光合有效辐射 Photosynthetically available radiation	土壤含水量 Soil water content	土壤温度 Soil temperature	降水量 Precipitation
分解率 Decompo- sition rate	3个月 3 months	0.82 (0.01)	0.08 (0.86)	0.75 (0.03)	0.65 (0.08)	0.73 (0.04)	0.83 (0.01)
	6个月 6 months	0.77 (0.02)	0.06 (0.88)	0.69 (0.06)	0.49 (0.22)	0.74 (0.04)	0.86 (0.01)
	9个月 9 months	0.71 (0.05)	-0.53 (0.17)	0.68 (0.06)	0.33 (0.42)	0.78 (0.02)	0.08 (0.86)
	12个月 12 months	0.35 (0.44)	-0.35 (0.44)	0.57 (0.19)	0.46 (0.30)	0.35 (0.44)	0.66 (0.10)

	分解时段 Incubated period	气温 Air temperature	相对湿度 Relative humidity	光合有效辐射 Photosynthetically available radiation	土壤含水量 Soil water content	土壤温度 Soil temperature	降水量 Precipitation
分解率 Decompo- sition rate	3个月 3 months	0.82 (0.01)	0.08 (0.86)	0.75 (0.03)	0.65 (0.08)	0.73 (0.04)	0.83 (0.01)
	6个月 6 months	0.77 (0.02)	0.06 (0.88)	0.69 (0.06)	0.49 (0.22)	0.74 (0.04)	0.86 (0.01)
	9个月 9 months	0.71 (0.05)	-0.53 (0.17)	0.68 (0.06)	0.33 (0.42)	0.78 (0.02)	0.08 (0.86)
	12个月 12 months	0.35 (0.44)	-0.35 (0.44)	0.57 (0.19)	0.46 (0.30)	0.35 (0.44)	0.66 (0.10)

	分解时段 Incubated period	气温 Air temperature	相对湿度 Relative humidity	光合有效辐射Photosynthetically available radiation	土壤含水量 Soil water content	土壤温度 Soil temperature	降水量 Precipitation
k值 k value	3个月 3 months	0.42 (0.30)	0.54 (0.11)	0.34 (0.41)	0.76 (0.03)	0.29 (0.49)	0.73 (0.04)
	6个月 6 months	0.76 (0.03)	-0.05 (0.92)	0.71 (0.05)	0.46 (0.25)	0.71 (0.05)	0.79 (0.02)
	9个月 9 months	0.75 (0.03)	-0.58 (0.13)	0.72 (0.04)	0.40 (0.32)	0.80 (0.02)	-0.05 (0.91)
	12个月 12 months	0.55 (0.20)	-0.59 (0.16)	0.55 (0.21)	-0.54 (0.21)	0.54 (0.21)	-0.70 (0.05)

	分解时段 Incubated period	气温 Air temperature	相对湿度 Relative humidity	光合有效辐射Photosynthetically available radiation	土壤含水量 Soil water content	土壤温度 Soil temperature	降水量 Precipitation
k值 k value	3个月 3 months	0.42 (0.30)	0.54 (0.11)	0.34 (0.41)	0.76 (0.03)	0.29 (0.49)	0.73 (0.04)
	6个月 6 months	0.76 (0.03)	-0.05 (0.92)	0.71 (0.05)	0.46 (0.25)	0.71 (0.05)	0.79 (0.02)
	9个月 9 months	0.75 (0.03)	-0.58 (0.13)	0.72 (0.04)	0.40 (0.32)	0.80 (0.02)	-0.05 (0.91)
	12个月 12 months	0.55 (0.20)	-0.59 (0.16)	0.55 (0.21)	-0.54 (0.21)	0.54 (0.21)	-0.70 (0.05)