北京林业大学学报Issue(6)：17-23,7.DOI:10.13332/j.cnki.jbfu.2014.06.006
氮素指数施肥对白桦播种苗养分承载和光合作用的影响
Effects of N exponential fertilization on nutrient loading and photosynthesis of Betula platyphylla seedlings
摘要
Abstract
In order to improve Betula platyphylla seedling quality, the biomass allocation, nutrient ( N, P, K) content dynamics, nutrient loading and leaf photosynthesis of B. platyphylla container seedlings under constant ( CF) , exponential ( EF) , half exponential ( HEF) and doubled exponential fertilization ( DEF) regimes and control (CK) were studied in the first year growing. Results showed that:1) at the end of the growing season, EF treatment improved the biomass of seedlings and the biomass proportion of root. The total biomass of seedlings under EF treatment was greater than that under CK ( P <0. 05 ) in 23. 87%. The biomass proportion of root under EF treatment was greater than that under both CF and DEF treatment ( P<0. 05 ) in 26. 09%. 2 ) EF treatment improved the nutrient loading of seedling with no significant difference from that under DEF treatment. However the nutrient content of seedling under EF treatment was greater than that under CF, HEF and CK treatment in 29. 65%, 33. 42% and 113. 74 respectively. 3 ) During the peak periods of seedlings growth, EF treatment promoted photosynthetic characteristics of seedling leaf. Chlorophyll concentration and photosynthetic rate of B. platyphylla seedlings under EF treatment was greater than that under CF treatment in 15. 2%( P <0. 05 ) , 7. 3%(P>0. 05) respectively. Meanwhile, seedling leaf area under EF treatment was greater than that under CF treatment in 14. 3%. 4) The concentration of N, P and N, K nutrient under 5 fertilization treatments was linear correlation. Exponential fertilization improved the P, K uptake efficiency ( EF>DEF>HEF>CF>CK) in seedlings. EF reffectively promoted biomass accumulation and improved nutrient loading, meanwhile, significantly increased P, K utilization. EF is the best fertilization regime for B. platyphylla seedlings.关键词
白桦/指数施肥/生物量分配/养分承载/叶片光合作用Key words
Betula platyphylla/exponential fertilization/biomass allocation/nutrient loading/leaf photosynthesis分类
农业科技引用本文复制引用
郝龙飞,刘婷岩,张连飞,贾斌英,李宁,李开隆..氮素指数施肥对白桦播种苗养分承载和光合作用的影响[J].北京林业大学学报,2014,(6):17-23,7.基金项目
“十二五”国家科技支撑计划课题(2012BAD21B02)。 （2012BAD21B02）
