UV-B辐射对杜英凋落叶化学组成及其分解的影响

生态学杂志

UV-B辐射对杜英凋落叶化学组成及其分解的影响

郭宝华¹,卜涛²,王志坤²,宋新章²,刘广路¹,范少辉^1**

(¹国际竹藤中心竹藤科学与技术重点实验室, 北京 100102; ^2浙江农林大学, 浙江临安 311300)

出版日期:2013-09-10 发布日期:2013-09-10

Effects of UV-B radiation on the leaf litter chemistry and subsequent decomposition of Elaeocarpus sylvestris.

GUO Bao-hua¹, BU Tao², WANG Zhi-kun², SONG Xin-zhang², LIU Guang-lu¹, FAN Shao-hui^1**

(¹International Centre for Bamboo and Rattan, Key Laboratory of Science and Technology of Bamboo and Rattan, Beijing 100102, China; ²Zhejiang Agricuheural and Forest University, Lin’an 311300, Zhejiang, China)

Online:2013-09-10 Published:2013-09-10

摘要/Abstract

摘要：

采用模拟UV-B辐射增强方法研究了UV-B辐射对中国亚热带常见树种杜英（Elaeocarpus sylvestris）叶片化学组成及其凋落后分解和养分释放的影响。结果表明：增强的UV-B辐射显著增加了杜英凋落叶中的N含量，显著降低了凋落叶中的C、P、K、木质素含量和C∶N、木质素∶N；在分解过程中，对照和UV-B辐射增强处理凋落叶的分解差异不显著，在前10个月的分解过程中均发生了N的富集，且对照凋落叶的N富集程度显著强于UV-B辐射增强处理；2组处理下凋落叶均发生了P和K的释放，但处理间差异不显著。

关键词: 硝化速率, 冻融循环, 铵态氮, 矿化速率, 雪被去除, 硝态氮

Abstract:

A simulation experiment was conducted to study the effects of ultraviolet B (UV-B) radiation on the leaf litter chemistry and subsequent decomposition of Elaeocarpus sylvestris, a common tree species in China subtropical zone. The leaf litter was derived from E. sylvestris seedlings, and exposed to elevated (10% enhancement) UV-B radiation and ambient UV-B radiation for one year. Elevated UV-B radiation increased the leaf litter N content significantly, but decreased the leaf litter C, P, K, and lignin contents and C∶N and lignin∶N ratios. The decomposition of the leaf litter derived from E. sylvestris seedlings and exposed to elevated UV-B radiation had no significant difference with that in ambient UV-B treatment. During the first 10 months of decomposition, the N enrichment occurred, and the enrichment degree was significantly higher in treatment ambient UV-B radiation than in treatment elevated UV-B radiation. The release of P and K occurred during litter decomposition, but had no significant difference between the two treatments.

Key words: mineralization rate., snow removal, ammonium, nitrate, freeze-thaw cycle, nitrification rate

郭宝华1,卜涛2,王志坤2,宋新章2,刘广路1,范少辉1**. UV-B辐射对杜英凋落叶化学组成及其分解的影响[J]. 生态学杂志.

GUO Bao-hua1, BU Tao2, WANG Zhi-kun2, SONG Xin-zhang2, LIU Guang-lu1, FAN Shao-hui1**. Effects of UV-B radiation on the leaf litter chemistry and subsequent decomposition of Elaeocarpus sylvestris.[J]. cje.

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