林龄、叶龄对亚热带杉木人工林碳氮稳定同位素组成的影响

doi:10.11707/j.1001-7488.20150103

Abstract

Abstract:

[Objective]Aims We measured the composition of foliar carbon and nitrogen stable isotopes (δ¹³C,δ¹⁵N) in Cunninghamia lanceolata plantations at ages of 3, 8, 14, 21 and 46. The aim of this study is to use the isotopic compositions as indicators to explore the degree of nitrogen saturation of C. lanceolata in various forest and foliar ages. [Method]Our experimental site is located at Xiayang forest farm, in Nanping, Fujian, China, where five adjacent C. lanceolata stand at various ages were selected. Four 20 m×20 m plots were established in each stand, the leaves (at different foliar ages) and soil from each plot were collected. The δ¹³C and δ¹⁵N of leaves and soil were measured by using Thermo Scientific MAT253, and the foliar N concentrations were measured with Elemental Analyzer Vario ELIII, and the ¹⁵N enrichment factors (EF) were calculated by foliar δ¹⁵N minus soil δ¹⁵N. [Result]The result showed that foliar δ¹⁵N ranged from -2.52‰ to 2.81‰, and the foliar N concentrations ranged from 7.72% to13.5%. There were significant differences in these two parameters among stand ages were, and they all tended to be higher in the 3- and 46-year-old stand compared with those in 8-, 14- and 21-years-old stand. However, no significant difference in foliar δ¹⁵N was found among different foliar ages. We also found a significant and positive correlation between foliar δ¹⁵N and nitrogen concentration. Meanwhile, the ¹⁵N enrichment factors (EF) in leaves were significantly different among foliar ages, and the young and old stand tended to be closer to zero. The foliar δ¹³C ranged from -29.93‰ to -27.88‰ and there was no significant difference in the δ¹³C among stand ages. However, there was significant difference in foliar δ¹³C among foliar ages and it tended to decline with foliar age. [Conclusion]We could attribute the different δ¹³C among stand and foliar ages to the water use efficiency and the photosynthetic efficiency. The difference of foliar δ¹⁵N, foliar N concentrations and ¹⁵N enrichment factors in various forest ages indicate that nitrogen might still be a factor that limits the growth of C. lanceolata at pole stage in subtropical region of China, and further studies are needed to verify it, for example, taking the influence of mycorhiza into consideration.

Key words: chronosequence, Cunninghamia lanceolata, nitrogen saturation, stable Isotope

CLC Number:

S718.43

Zheng Lujia, Huang Zhiqun, He Zongming, Wang Xiayi, Liu Zhuoming, Liu Ruiqiang, Xiao Haoyan. Influence of Forest and Foliar Ages on The Composition of Stable Carbon and Nitrogen Isotope of Cunninghamia lanceolata in Subtropic China[J]. Scientia Silvae Sinicae, 2015, 51(1): 22-28.

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Influence of Forest and Foliar Ages on The Composition of Stable Carbon and Nitrogen Isotope of Cunninghamia lanceolata in Subtropic China

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