文献类型：期刊文献

中文题名：NP营养对杉木、湿地松、尾叶桉苗木干物质分配的影响

英文题名：Effects of Different Levels of NP Nutrition on the Dry Matter Distribution of Rootand Shoot of Chinese Fir,Slash Pine and Timor Mahogany Seedlings

作者：张建国[1] 李贻铨[1] 万细瑞[2]

第一作者：张建国

机构：[1]中国林业科学研究院林业研究所国家林业局林木培育重点实验室;[2]中国林业科学研究院亚热带林业实验中心

年份：2006

卷号：42

期号：5

起止页码：48-53

中文期刊名：林业科学

外文期刊名：Scientia Silvae Sinicae

收录：CSTPCD;;Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：国家林业局林木培育重点实验室基金项目(03)资助。

语种：中文

中文关键词：酸性土壤;营养亏缺;杉木;湿地松;尾叶桉;根冠比;干物质分配

外文关键词：acid soil; nutritional stress; Chinese Fir; Slash Pine; Timor Mahogany; root/shoot ratio,dry matter distribution

分类号：S723.7

摘要：对酸性土壤上NP营养对杉木、湿地松、尾叶桉苗木根冠干物质分配的影响进行研究。结果表明:随着土壤NP营养亏缺的解除,尾叶桉苗叶片、根系干物质的累积随之下降,光合产物向茎部转移;湿地松根、茎干物质积累随NP营养水平的提高而下降,光合产物的累积向叶片转移;杉木根系干物质随NP营养亏缺的解除而下降,光合产物向叶片和茎部转移。3个树种的共同特点是:在营养亏缺状态下,苗木根冠比(R/S)的提高实际上反应了苗木对土壤NP营养亏缺的适应性特征。关于NP营养与根冠干物质分配的关系可以应用异速生长模型、Thornley模型、功能平衡模型来表示,3种模型均能良好反应出酸性土壤上NP营养对苗木干物质分配的影响,应用模型可对苗木根冠生长速率进行调控,这无疑对苗木的培育有重大的意义。异速生长模型中k=1可作为判别苗木营养最适平衡的一个标志。
In this paper, the relationships between NP nutrition and the ratio of root to shoot（R/S） of seedlings of main afforestation tree species in south China, including Chinese Fir, Slash Pine and Timor Mahogany were studied in acid soil. The results showed that： With the increasing of the NP nutrition of soil, the accumulation of root dry matter of all experimented tree species decreased, and the photosynthetic products moved from root to the rest parts of seedling body. The responses of the dry weight of leaf and stem were different from each other. Of the Timor Mahogany leaf went down, and its stem＇ s rose up. On the contrary, the dry weight of the Slash Pine lear and stem increased. So, it is obvious that the more phosphorus in the soil, the lower the R/S. In other words, the increasing of R/S is an adaptability of seedling to the nutritional stress on acid soil. The relationships between the NP nutrition stress and R/S could be expressed as the following three models ： Allometric model（ r = as^k ）, Thornley＇s model and Function Equilibrium model. These models could give some important directions in seedling cultivation. According to Allometric model,a new nutrient diagnosis method could be got. The main point of the new method is that when the parameter k = 1, which is the mark of the balance status of seedling, the biomass of seedling might reach the maximum.