文献类型：期刊文献

中文题名：模拟氮沉降对油松幼苗生长的影响

英文题名：Effects of Simulated Nitrogen Deposition on Seedling Growth of Pinus tabulaeformis

作者：李化山[1] 汪金松[2] 法蕾[3] 赵秀海[1]

第一作者：李化山

机构：[1]北京林业大学森林资源与生态系统过程北京市重点实验室;[2]中国林业科学研究院森林生态环境与保护研究所;[3]中国林业科学研究院华北林业实验中心

年份：2013

卷号：19

期号：5

起止页码：774-780

中文期刊名：应用与环境生物学报

外文期刊名：Chinese Journal of Applied and Environmental Biology

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：国家林业公益性行业科研专项项目(201104009);国家自然科学基金项目(31340022)资助~~

语种：中文

中文关键词：氮沉降;生物量分配;根系形态;油松幼苗

外文关键词：nitrogen deposition; biomass allocation; root morphology; Pinus tabulaeformis seedling

分类号：Q948.11

摘要：为了解油松幼苗地上地下生物量分配及根系形态特征对模拟氮(N)沉降的响应,以1年生油松幼苗为研究材料,设计4个氮水平:对照(N0,0 kg hm-2a-1,以N计,下同),低氮(N1,50 kg hm-2a-1),中氮(N2,100 kg hm-2a-1)和高氮(N3,150 kg hm-2a-1),分析不同施氮水平下油松幼苗的地上地下生物量分配季节动态以及根系形态的差异.结果表明:不同氮处理幼苗总干重在不同月份呈显著变化(P<0.01),施氮明显促进幼苗生物量的增加,实验末期低氮、中氮和高氮处理相比对照处理分别使幼苗生物量增加了15.26%、23.38%和31.49%;不同氮处理幼苗叶重比、茎重比、根重比、茎叶比、根冠比、相对生长速率、根系直径、根长/生物量、根表面积/生物量、体积/生物量、根尖数/生物量的值均呈显著的月份动态(P<0.01),但不同处理间差异不显著(P>0.05),并且小细根(0To evaluate the effects of simulated nitrogen deposition on biomass allocation and root morphological characteristics of one-year old Chinese pine （Pinus tabulaeformis） seedlings, we studied four nitrogen fertilization treatments as follows： control（CK, 0 kg N hm-2a-1）, low nitrogen （LN, 50 kg N hm-2 a-1）, medium nitrogen （MN, 100 kg N hm-2 a-1） and high nitrogen （HN, 150 kg N hm-2 a-1）. The Results showed significant seasonal variations of total seedling biomass within different treatments, with external nitrogen significantly promoting seedling biomass accumulation （P 〈 0.01）. At the end of growth season, the seedling biomass in LN, MN and HN treatment was higher than that of the control by 15.26%, 23.38% and 31.49%, respectively. Leaf weight ratio （LWR）, stem weight ratio （SWR）, root weight ratio （RWR）, stem to needle ratio （SNR）, root to shoot ratio （RSR）, and relative growth rate within different treatment showed significant seasonal changes （P 〈 0.01）, however, nitrogen deposition had no significant effect on the biomass allocation （P 〉 0.05）. Similarly, root morphological characteristics including length/biomass, surface area/biomass, volume/biomass, tips/biomass within different treatment presented significant seasonal changes （P 〈 0.01）, with no significant differences between treatments （P 〉 0.05）, but these root morphological characteristics of small fine root responded obviously to nitrogen （P 〈 0.05）. In conclusion, N applications significantly increased seedling biomass of P. tabulaeformis, but had no significant impact on biomass allocation and root morphological characteristics during the growth season. Fig 4, Tab 3, Ref 34