土壤动物对四川盆地四种树种凋落叶在不同物候时期可溶性碳和氮动态的影响

生态学杂志

土壤动物对四川盆地四种树种凋落叶在不同物候时期可溶性碳和氮动态的影响

廖姝^1,2,杨万勤^1,2,彭艳^1,2,李俊^1,2,谭羽^1,2,谭波^1,2,吴福忠^1,2*#br#

(¹四川农业大学生态林业研究所高山森林生态系统定位研究站，成都 611130； ²林业生态工程四川省重点实验室，成都 611130)

出版日期:2016-12-10 发布日期:2016-12-10

Effects of soil fauna on the concentrations of dissolved organic carbon and total dissolved nitrogen in four types of foliar litters in different phenophases in Sichuan Basin.

LIAO Shu^1,2, YANG Wan-qin^1,2, PENG Yan^1,2, LI Jun^1,2, TAN Yu^1,2, TAN Bo^1,2, WU Fu-zhong^1,2*#br#

(¹Longterm Research Station of Alpine Forest Ecosystems, Institute of Ecology and Forestry, Sichuan Agricultural University, Chengdu 611130, China; ²Key Laboratory of Ecological Forestry Engineering of Sichuan Province, Chengdu 611130, China).

Online:2016-12-10 Published:2016-12-10

摘要/Abstract

摘要： 采用凋落物分解袋法，研究了土壤动物对四川盆地4种典型树种\[油樟(Cinnamomum longepaniculatum)、马尾松(Pinus massoniana)、麻栎(Quercus acutissima)和柳杉(Cryptomeria fortune)\]凋落叶在分解第一年(2013年11月—2014年10月)不同物候时期可溶性有机碳(DOC)和总可溶性氮(TDN)浓度动态的影响。结果表明，4种凋落叶均表现出DOC浓度降低、TDN浓度升高的趋势。土壤动物显著降低了凋落叶DOC含量而增加了TDN含量，且此现象分别在马尾松和柳杉凋落叶中最为明显。土壤动物对凋落叶中DOC含量的影响在叶衰期更明显，而对TDN含量的影响在秋末落叶期更明显。这些结果说明，土壤动物显著影响凋落叶分解过程中可溶性碳、氮动态，这为认识凋落物分解过程中氮固持现象提供了一定的理论依据。同时，土壤动物在生长季节降低凋落叶可溶性氮浓度，可能有利于满足植物在生长季节对养分的需求。

关键词: 可溶性有机质, 芳香化指数, 腐殖化指数, 森林更新, 荧光光谱

Abstract: A field litterbag experiment using four dominant types of foliar litters (Cinnamomum longepaniculatum, Pinus massoniana, Quercus acutissima and Cryptomeria fortune) in the Sichuan Basin was conducted at two subtropical forests from November 2013 to October 2014. Airdrying foliar litters were placed in nylon litterbags (20 cm × 20 cm in size, 10 g per litterbag) with mesh sizes of 0.04 mm on the bottom and 0.04 mm (to exclude soil fauna) or 3.00 mm (to permit soil fauna in) on the top. Samples were harvested in different phenophases (litter falling, budding, expanding, maturing and senescing periods) and were used to determine the concentrations of dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) in these foliar litters. After one year of decomposition, the DOC concentrations in the four foliar litters tended to decrease, whereas TDN concentrations tended to increase. Compared with the no soil fauna treatment, the DOC concentrations in foliar litters significantly decreased but the TDN concentrations significantly increased in the treatment with soil fauna, and the decrease of DOC concentration and the increase of TDN concentration were more obvious in the C. longepaniculatum and C. fortune litter, respectively. The effects of soil fauna on DOC and TDN concentrations were stronger in the leaf senescing and leaf falling periods, respectively. These results indicated that soil fauna significantly affects the decomposition of dissolved carbon and nitrogen in foliar litter, supporting the phenomenon of nitrogen sequestration during litter decomposition. Furthermore, the decomposed nitrogen in foliar litter promoted by soil fauna during the growing season is favorable for the requirement of nutrients for plant growth.

Key words: fluorescence spectra, dissolved organic matter, aromatic index, humification index., forest regeneration

廖姝1,2,杨万勤1,2,彭艳1,2,李俊1,2,谭羽1,2,谭波1,2,吴福忠1,2*. 土壤动物对四川盆地四种树种凋落叶在不同物候时期可溶性碳和氮动态的影响[J]. 生态学杂志.

LIAO Shu1,2, YANG Wan-qin1,2, PENG Yan1,2, LI Jun1,2, TAN Yu1,2, TAN Bo1,2, WU Fu-zhong1,2*. Effects of soil fauna on the concentrations of dissolved organic carbon and total dissolved nitrogen in four types of foliar litters in different phenophases in Sichuan Basin.[J]. cje.

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