Oren R, Schulze E -D, Werk K S, Meyer J, Schneider B U, Heilmeier H
School of Forestry and Environmental Studies, Duke University, 27706, Durham, NC, USA.
Lehrstuhl Pflanzenökologie der Universität Bayreuth, Postfach 101251, D-8580, Bayreuth, Federal Republic of Germany.
Oecologia. 1988 Feb;75(1):25-37. doi: 10.1007/BF00378810.
This is the first in a series of papers on the growth, photosynthetic rate, water and nutrient relations, root distribution and mycorrhizal frequency of two Norway spruce forests at different stages of decline. One of the stands was composed of green trees only while the other included trees ranging in appearance from full green crowns to thin crowns with yellow needles. In this paper we compare the growth and carbohydrate relations of the two stands and examine relationships among growth variables in ten plots. The declining stand produced 65 percent of the wood per ground area compared with the stand in which all trees were green because its foliage produced less wood at any level of leaf area index. The difference in foliage efficiency between the sites could not be explained by differeneces in climate, competition or stand structure. The declining stand appeared to have lower carbon gain as indicated by a smaller increase in reserve carbohydrates before bud break, and weaker sinks for carbohydrates as indicated by less use of the stored carbohydrates than the healthy stand. Thus, growth reduction was probably related to factors which affect both photosynthesis and, even more, the sinks for carbohydrate.
这是一系列关于处于不同衰退阶段的两片挪威云杉林的生长、光合速率、水分与养分关系、根系分布及菌根频率的论文中的第一篇。其中一片林分仅由绿色树木组成，而另一片则包括外观从全绿树冠到针叶发黄的稀疏树冠的树木。在本文中，我们比较了这两片林分的生长和碳水化合物关系，并研究了十个样地中生长变量之间的关系。与所有树木均为绿色的林分相比，衰退林分每单位地面面积的木材产量为其65%，因为在任何叶面积指数水平下，其树叶产生的木材都较少。 sites 之间树叶效率的差异无法用气候、竞争或林分结构的差异来解释。正如芽萌发前储备碳水化合物增加较少所表明的那样，衰退林分的碳增益似乎较低，而且正如与健康林分相比储存碳水化合物的利用较少所表明的那样，其碳水化合物的库也较弱。因此，生长减少可能与影响光合作用以及甚至更多地影响碳水化合物库的因素有关。
