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高浓度O3对城市蒙古栎凋落叶分解和养分释放的影响

苏丽丽,徐胜*,付伟,何兴元,陈玮,赵诣,平琴   

  1. (中国科学院沈阳应用生态研究所森林与土壤生态国家重点实验室,  沈阳 110016)
  • 出版日期:2016-02-18 发布日期:2016-02-18

Effects of elevated O3 on  leaf litter decomposition and nutrient release of Quercus mongolica in city.

SU Li-li, XU Sheng*, FU Wei, HE Xing-yuan, CHEN Wei, ZHAO Yi, PING Qin   

  1. (State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China)
  • Online:2016-02-18 Published:2016-02-18

摘要:

采用开顶箱(OTCs)模拟法和分解袋法,以O3自然浓度(40 nmol·mol-1)为对照,研究高浓度O3(约120 nmol·mol-1)对城市自然环境下生长的10年生蒙古栎凋落叶分解和养分释放的影响,分解时长达150 d.结果表明:高浓度O3未对蒙古栎凋落叶的分解产生显著影响.高浓度O3抑制了蒙古栎凋落叶C、K释放,分解150 d,高浓度O3处理K残留率为23.9%,显著高于对照(17.1%).高浓度O3在分解前期(0~60 d)抑制了凋落叶N、木质素的释放,在分解后期(60~150 d)起促进作用.高浓度O3处理与对照木质素/N变化趋势一致且无显著差异.除分解中期(60 d)外,对照P残留率始终高于高浓度O3处理.C/P变化趋势与P相反,在整个分解过程中,高浓度O3处理C/P高于对照,而且C、N、K残留率以及C/N与凋落叶干质量剩余率呈显著正相关.因此,高浓度O3将对蒙古栎林的营养循环产生一定影响.
 

Abstract: The leaf litters of 10-year-old Quercus mongolica were put in nylon bags and exposed to elevated O3  level (120 nmol·mol-1) with the control of 40 nmol·mol-1 in open top chambers (OTCs) for 150 days to test the effect of high O3 on the litter decomposition. The results showed that  no significant difference was observed in residual mass between elevated O3 treatment and the control. Elevated O3 inhibited the release of C and K during the decomposition, the residual rate of K under elevated O3treatment (23.9%) was significantly higher than that of the control (17.1%) after 150day decomposition. Compared with the control, N mineralization and lignin degradation in elevated O3 treatment were inhibited during early period of decomposition (0-60 d), but were promoted in later period (90-150 d). The changes of lignin/N showed no significant difference between elevated O3 treatment and the control during the decomposition. Elevated O3 generally promoted the release of P in leaf litter of Q. mongolica during the decomposition. C/P ratio was higher under elevated O3 than that under control. Significant positive correlation was shown between residual dry mass of leaf litters and the residual rate of C, N, K, C/N ratio during decomposition. Elevated O3 might play an important role in the nutrient cycle of forest ecosystem in highO3 pollution area.