土壤-植物系统中光照与氮素的相互关系研究  

Interrelation of light and nitrogen in soil plant system

作　　者：曾希柏[1] 侯光炯[2] 青长乐[2] 谢德体[2] 

机构地区：[1]中国农业科学院山区研究室,北京100081 [2]西南农业大学资源环境学院,重庆400716

出　　处：《生态学报》2000年第1期103-108,共6页Acta Ecologica Sinica

摘　　要：运用盆栽试验,以莴笋为材料,在人工气候箱内进行研究,其结果表明:光照强度的变化,不仅会引起莴笋生物量和养分吸收量的改变,而且也将导致土壤养分状况的差异。不同肥力的3种紫色土,其养分含量受光照强度变化影响的状况是,NH+4-N和NO-3-N的含量均以大眼泥土>沙土>石骨子土,而碱解氮含量的变化则以沙土>石骨子土>大眼泥土。光照强度的变化亦影响氮肥的施用效果,在试验光强(80～320μmol/m2·s)范围内,光照愈强时莴笋产量愈高、且其同时对氮肥的需要量也相应由0.213g/pot增加到0.38g/pot。本试验的结果,较为完整地阐述了光照强度的变化与土壤养分、作物营养以及施肥之间的相互关系。The result of pot culture experiments of lettuce in artificial climate cases indicated that the change of light intensity not only influenced the change of lettuce yield and the take up of soil nutrients,but also caused the change of nutrient content in different soils.the change of nutrient contents in three purple soils affected by light were that NH + 4 N and NO - 3 N contents were:in loarnic purple soil>sandic purple soil>gravelic purple soil,but the alkaline hydrolyzable N contents in them was:sandic purple soil>gravelic purple soil>loarnic purple soil.The efficiency of nitrogen fertilizer was influenced by light intensity.Within the range of test light intensity(80～320μmol/m 2·s),the stronger the light intensity,the higher the yield of lettuce.Meanwhile,the required quantity of nitrogen fertilizer was increased from 0.215g/pot to 0.38g/pot.The result of this research expounded the interrelation between the light intensity and soil nutrient content,and between crop nutrition and fertilizer application rate.

关 键 词：光照 氮素 相互关系 土壤--植物系统 光肥平衡 

分 类 号：S181[农业科学—农业基础科学]