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当前位置: 首页 > 文章 > 模拟氮沉降对低磷胁迫下马尾松生长和磷效率的影响 应用生态学报 2014,25 (5) 1275-1282
Position: Home > Articles > Effects of simulated nitrogen deposition on growth and phosphorus efficiency of Pinus massoniana under low phosphorus stress Chinese Journal of Applied Ecology 2014,25 (5) 1275-1282

模拟氮沉降对低磷胁迫下马尾松生长和磷效率的影响

作  者：
庞丽;张一;周志春;丰忠平;储德裕
单  位：
浙江省淳安县姥山林场;中国林业科学研究院亚热带林业研究所
关键词：
马尾松;家系;N;沉降;低;P;胁迫;效率;根系形态参数
摘  要：
近年来大气N沉降日趋严重,导致森林土壤有效N含量增加,N/P发生改变,将会影响低P胁迫下林木的生长发育和P效率.本文以马尾松家系为研究对象,设置模拟N沉降与同质低P(介质表层与深层均缺P)、异质低P(介质表层P丰富、深层缺P)耦合的盆栽试验,研究N沉降对马尾松生长性状以及P吸收和利用效率的影响.结果表明:同质低P下,模拟N沉降对马尾松生长性状和P效率影响较小,但存在显著的N×家系互作效应,家系40×44和71×20在N沉降后生物量增加,家系36×29和73×23生物量降低;异质低P下,模拟N沉降显著增加了马尾松苗高、生物量以及P吸收效率等,其原因是促进了根系生长和表层土壤中根系分布比例的增加.不同P环境下模拟N沉降对马尾松生长的影响,还与植株N/P有关.同质低P环境下,马尾松植株N/P为13.8,植株对N敏感性低,酸性磷酸酶活性增加,但未改善马尾松生长状况.在异质低P环境中,植株N/P为9.7,模拟N沉降显著增加了苗木生物量和P吸收效率,但未显著改变酸性磷酸酶活性.
译  名：
Effects of simulated nitrogen deposition on growth and phosphorus efficiency of Pinus massoniana under low phosphorus stress
作  者：
PANG Li;ZHANG Yi;ZHOU Zhi-chun;FENG Zhong-ping;CHU De-yu;Research Institute of Subtropical Forestry,Chinese Academy of Forestry;Anshun College;Laoshan Forest Farm;
关键词：
Pinus massoniana;;family;;nitrogen deposition;;low phosphorus stress;;phosphorus efficiency;;root trait parameter
摘  要：
Atmospheric nitrogen( N) deposition dramatically raised in recent decades,resulting in increases of soil N availability and N / P ratio,which would impact plant growth and P efficiency under low P stress. Taking breeding population of Pinus massoniana as test materials,a pot experiment was conducted to simulate two P conditions,i. e.,homogeneous low P availability vs. heterogeneous low P among soil layers,in combination with two N deposition levels on growth traits and P absorption and utilization efficiency of P. massoniana. Under the homogeneous low phosphorus condition,growth traits and P efficiency of P. massoniana were not significantly improved by simulated nitrogen deposition,but significant nitrogen × family interaction effect was detected,with the biomass of family 40×44 and 71×20 being increased,36 ×29 and 73 ×23 being decreased. Under the heterogeneous low P condition,significant N effects on the seedling height,biomass and P absorption efficiency were observed,due to promoted root length and root distribution ratio of topsoil. In addition,the effects of simulated N deposition on growth and P efficiency of P. massoniana were relevant to the N / P ratio. Under the homogeneous low P condition,the N / P ratio of P. massoniana plant was 13. 8,plants exhibited a low sensitivity to simulated N deposition,root secreted APase activity was increased but the plant growth was not promoted. In comparison,the plant N / P ratio was 9. 7 under the heterogeneous low P condition,and the plant growth and P efficiency were significantly promoted,while no obvious change occurred in root secreted APase activity.

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