马尾松苗遭遇不同养分斑块的觅养行为和生长响应  

Foraging Behaviors and Growth Responses of Pinus massoniana Seedlings in the Heterogeneous Nutrient Environment with Different Nutrient Patches

作　　者：马雪红[1] 周志春[1] 张一[1] 金国庆[1] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江富阳311400

出　　处：《林业科学研究》2010年第5期697-702,共6页Forest Research

基　　金：国家自然科学基金项目(30571482);国家林业局"948"项目(2006-4-59);"十一五"国家科技支撑专题项目(2006BAD01A1403)

摘　　要：设置了N、P和全养分斑块等3种异质养分环境的盆栽试验,并以同质养分环境的盆栽试验为对照,研究马尾松苗觅取N、P斑块养分的行为差异。结果表明:马尾松苗在遭遇富P和全养分斑块时将明显有利其苗的生长和干物质积累,而在遭遇富N斑块时马尾松苗生长反应则不敏感。马尾松苗在觅取斑块P素时根系形态可塑性和生理可塑性发挥了重要的作用,遭遇富P素斑块时马尾松苗根系大量增生,表现出较大的根系广布性、较高的觅养精确性和反应敏感度,根系N、P吸收效率也明显提高;马尾松苗在N斑块的异质养分环境中的根系广布性小、觅养精确性和反应敏感度低,其根系不必通过大量增生来获取移动性较好的斑块N素,且根系N、P吸收效率也较低,说明马尾松在觅取富N斑块养分时根系形态可塑性和生理可塑性的作用不明显;马尾松苗遭遇全养分斑块的生长反应和觅养行为与遭遇富P斑块时类似。A pot experiment consisting of three different heterogenerous nutrient environments was designed,with homogeneous nutrient environment as control,to study the differences of foraging behavior of Pinus massoniana to N and P nutrient patches.The results showed that P.massoniana exhibited greater seedling growth,more biomass accumulation in P and whole nutrient heterogeneous environment,while it responsed unsensitively to nutrient heterogeneous environment.The root physiological and morphological plasticity played important roles when P.massoniana absorbed nutrient in P patch with poor mobility.Moreover,in P patch,root growth exhibited some characteristics,such as root proliferation,greater root scale,higher precision and sensitivity,improvement of root N and P absorption efficiency.However,its root scale,precision and sensitivity were lower in N patch,while root did not need to proliferate to acquire N with rich mobility,and N and P absorption efficiency were also low,which could illuminate that root physiological and morphological plasticity had no obvious effects on acquiring nutrients in N-enriched patch.The foraging behavior of P.massoniana in whole nutrient patch was similar with in P heterogeneous nutrient environment.

关 键 词：马尾松 异质养分环境 斑块养分 觅养行为 生长响应 

分 类 号：S791.248[农业科学—林木遗传育种]