林业科学2017，Vol.53Issue(4)：37-48,12.DOI:10.11707/j.1001-7488.20170405
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
Interaction of Soil Water and Nitrogen on the Photosynthesis and Growth in Pinus tabulaeformis Seedlings
摘要
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.关键词
油松/叶片生理/光合作用/叶绿素荧光/生长/生物量Key words
Pinus tabulaeformis/leaf physiology/photosynthesis/chlorophyll fluorescence/growth/biomass分类
农业科技引用本文复制引用
郭文霞,赵志江,郑娇,李俊清..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[J].林业科学,2017,53(4):37-48,12.基金项目
Beijing to Build Key Discipline "Ecology" Project (201401) （201401）
High Level University Construction Project of China Scholarship Council (2012). （2012）
