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New publication recommendation in JMS Vol.13 No.6

Contribution of aboveground litter to soil respiration in Populus davidiana Dode plantations at different stand ages

Journal of Mountain Science在2016年第6期报道了赵昕、李发东、张万军、艾治频四位研究人员的文章:不同林龄杨树人工林地表凋落物对土壤呼吸的贡献

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凋落物呼吸是地表土壤呼吸的重要组成部分。然而,林龄变化在地表凋落物对土壤呼吸贡献的研究尚不多见。中科院地理科学与资源研究所赵昕博士等在京津风沙源治理工程区开展野外控制试验,探究不同林龄地表凋落物对土壤呼吸的贡献及其对环境因子的影响。试验选取5年、10年、20年杨树人工林分别设置覆盖凋落物和去除凋落物两个处理。结果表明,5年、10年、20年杨树人工林地表凋落物对土壤呼吸贡献的月平均值分别为18.46% ±4.63%, 16.64% ±9.31%, 22.37% ±8.17%。去除凋落物显著降低了土壤呼吸和土壤水分,但不会对土壤温度产生影响。土壤呼吸与5厘米土壤温度呈指数正相关关系,与10厘米土壤水分的关系则可以用二次方程表示,然而用土壤温度和土壤水分共同解释土壤呼吸的变异比单独用一个因子解释更好。覆盖凋落物和去除凋落物对土壤呼吸的温度敏感性均会随着林龄的增加而增大。该研究可为评估工程造林的土壤碳通量提供参考。

该项目该项研究得到国家自然科学基金(31170414)、中国科学院"百人计划"、中国科学院战略性先导科技专项项目(XDA05060600)的资助。

Contribution of aboveground litter to soil respiration in Populusdavidiana Dode plantations at different stand ages

Litter respiration is a major component of the soil respiration. However, the variations in the contribution of aboveground litter to soil respiration for stands of varying ages deserve to be deeply studied.

Researchers from the Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences conducted an in situ litter-manipulation experiment at Beijing-Tianjin sandstorm source area. To assess soil respiration induced by aboveground litter, treatments of litter and no litter were applied to 5-, 10-, and 20-year-old stands of Populus davidiana Dode. Results showed that the monthly average contribution of aboveground litter to total soil respiration were 18.46% ± 4.63%, 16.64% ± 9.31%, and 22.37% ± 8.17% for 5-, 10-, and 20-year-old stands, respectively. Litter removal significantly decreased soil respiration and soil water content for all stand ages (p < 0.05) but not soil temperature (p > 0.05). Variations of soil respiration could be explained by soil temperature at 5-cm depth using an exponential equation and by soil water content at 10-cm depth using a quadratic equation, whereas soil respiration was better modeled using the combined parameters of soil temperature and soil water content than with either soil temperature or soil water content alone. Temperature sensitivity (Q10) increased with stand age in both the litter and the no litter treatments. This study provides insights for assessing soil carbon flux of plantations.

This work was supported by the National Natural Science Foundation of China (Grant No. 31170414), the 100 Talents Program of Chinese Academy of Sciences, and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA05060600).

Citation:

Zhao X, Li FD, Zhang WJ, et al. (2016) Contribution of aboveground litter to soil respiration in Populus davidiana Dode plantations at different stand ages. Journal of Mountain Science 13(6). DOI: 10.1007/s11629-015-3777-2