Chester A L, Oechel W C
Biology Dept, West Virginia University, 26506, Morgantown, WV, USA.
Systems Ecology Research Group, San Diego State University, 92182, San Diego, CA, USA.
Oecologia. 1986 Apr;69(1):121-125. doi: 10.1007/BF00399047.
Nitrogen allocation patterns from leaves of Vaccinium vitis-idaea (evergreen) and Vaccinium uliginosum (deciduous) were assessed using a foliar application of N labeled ammonium sulfate. These are wild perennial shrubs inhabiting arctic and subarctic regions. More label was transported from labeled leaves of Vaccinium uliginosum then Vaccinium vitis-idaea. In Vaccinium uliginosum, the amount of label transported from the labeled leaf increased as the concentration of nitrogen in the label increased. Current growth in Vaccinium uliginosum was a strong sink for nitrogen because most of the N transported from the labeled leaf was contained in this region. In addition, when greater quantities of nitrogen were applied, larger quantities were retained in current growth. Current growth of Vaccinium vitis-idaea, on the other hand, was not as strong a sink because regardless of the nitrogen available thru various label concentrations, the enrichment of current growth was not affected and was not significantly different from older stems or leaves. Yet, in both species, nitrogen was transported freely from leaves of all positions along the stem to all parts of the plant including roots and rhizomes. The position of the leaf along the stem had no effect on the patterns of allocation to other organs.
通过叶面喷施氮标记的硫酸铵，评估了越桔（常绿）和笃斯越桔（落叶）叶片中的氮分配模式。这些是生长在北极和亚北极地区的野生多年生灌木。从笃斯越桔标记叶片中运输出的标记物比越桔更多。在笃斯越桔中，从标记叶片运输出的标记物数量随着标记物中氮浓度的增加而增加。笃斯越桔当前的生长是氮的一个强大汇，因为从标记叶片运输出的大部分氮都包含在这个区域。此外，当施用更多氮时，更多的氮被保留在当前生长中。另一方面，越桔当前的生长不是一个强大的汇，因为无论通过各种标记浓度可获得的氮量如何，当前生长的富集不受影响，并且与老茎或叶片没有显著差异。然而，在这两个物种中，氮都能从茎上所有位置的叶片自由运输到植物的所有部位，包括根和根茎。叶片在茎上的位置对向其他器官的分配模式没有影响。
