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林业科学 ›› 2017, Vol. 53 ›› Issue (4): 37-48.doi: 10.11707/j.1001-7488.20170405

• 论文与研究报告 • 上一篇    下一篇

土壤水分和氮素的交互作用对油松幼苗光合和生长的影响

郭文霞1,2,3, 赵志江4, 郑娇1, 李俊清1   

  1. 1. 北京林业大学森林培育与保护省部共建教育部重点实验室 北京 100083;
    2. 中国林学会 北京 100091;
    3. 悉尼科技大学植物功能生物学和气候变化研究组 新南威尔士州 2007;
    4. 福建中咨工程咨询有限公司 福州 350003
  • 收稿日期:2016-01-29 修回日期:2017-01-06 出版日期:2017-04-25 发布日期:2017-05-26
  • 基金资助:
    Beijing to Build Key Discipline "Ecology" Project (201401); High Level University Construction Project of China Scholarship Council (2012).

Interaction of Soil Water and Nitrogen on the Photosynthesis and Growth in Pinus tabulaeformis Seedlings

Guo Wenxia1,2,3, Zhao Zhijiang4, Zheng Jiao1, Li Junqing1   

  1. 1. Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University Beijing 100083;
    2. Chinese Society of Forestry Beijing 100091;
    3. Plant Functional Biology and Climate Change Cluster, University of Technology Sydney NSW 2007;
    4. Fujian CIECC Engineering Consulting Co.Ltd Fuzhou 350003
  • Received:2016-01-29 Revised:2017-01-06 Online:2017-04-25 Published:2017-05-26
  • Contact: 李俊清
  • Supported by:
    Beijing to Build Key Discipline "Ecology" Project (201401); High Level University Construction Project of China Scholarship Council (2012).

摘要: [目的] 了解土壤水分亏缺和氮沉降对油松生长和光合特性的影响,为造林和再造林树种选择提供依据。[方法] 选取2年生油松幼苗,按照嵌套设计,设置4个土壤水分梯度(W1、W2、W3、W4)和4个施氮水平(N1、N2、N3、N4),调查土壤水分和施氮的交互作用对油松幼苗生长和光合特性的影响。[结果] 土壤水分充足条件下(W3和W4),施氮能够显著促进油松幼苗的生长和生物量积累,但在水分亏缺条件下(W1和W2)却会加剧缺水,对幼苗生长产生负面影响;土壤水分充足条件下,施氮能够提高油松幼苗的光合能力,但在水分亏缺状态下却会降低幼苗的光合能力,这与光系统Ⅱ的实际量子效率和光化学猝灭系数的变化规律一致;W3N2处理对提高油松幼苗生长、生物量积累和光合作用能力最有利。[结论] 在我国中部和东北部湿润地区,氮沉降对油松的光合作用和干物质生产是有利的,而在西北干旱半干旱地区氮沉降却是有害的,因此,在西北干旱半干旱地区实施生态恢复或水土保持工程时应该谨慎选择树种,尽量不再使用油松。

关键词: 油松, 叶片生理, 光合作用, 叶绿素荧光, 生长, 生物量

Abstract: [Objective] Pinus tabulaeformis is widely distributed over China, and a dominant species as an afforestation and reforestation tree species in ecological restoration and soil conservation programs. But as the climate change intensifies, P. tabulaeformis forests are experiencing soil water deficit and nitrogen deposition during growth season. Thus an experiment was carried out to investigate the interaction of different soil water content and N addition on the growth and photosynthesis of P. tabulaeformis seedlings by measuring whole-plant growth, leaf area, biomass production and allocation, leaf photosynthesis, and chlorophyll fluorescence.[Method] Two-year-old seedlings of P. tabulaeformis were subjected to a nested design with four soil water regimes (W1, W2, W3, and W4) and four N addition levels (N1, N2, N3 and N4).[Result] The result showed that N addition significantly enhanced growth and biomass production of the seedlings under plentiful soil water conditions (W3 and W4), but aggregated the negative effect of low soil water treatments (W1 and W2) on plant growth. Moreover, N addition was able to lead to an increase in photosynthetic capacity under high soil water conditions (W3 and W4), but a decrease in low soil water treatments (W1 and W2), which was paralleled with the shifts of PSⅡ actual efficiency and PSⅡ photochemical quenching. Furthermore, W3N2 treatment was the appropriate N supply and optimum soil water conditions to growth, biomass production, and photosynthetic capacity of P. tabulaeformis seedlings.[Conclusion] These results suggest N deposition might be beneficial to biomass production and photosynthesis of P. tabulaeformis forests in the central and northeast areas in China with abundant rainfall, but harmful to P. tabulaeformis forests in the northwest arid and semi-arid regions. Thus, in the northwest arid and semi-arid regions in China, P. tabulaeformis should no longer be used as afforestation and reforestation tree species in ecological restoration and soil conservation programs.

Key words: Pinus tabulaeformis, leaf physiology, photosynthesis, chlorophyll fluorescence, growth, biomass

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