Effects of unusually large seed crop on litterfall and nitrogen retranslocation in Himalayan oaks
Effects of unusually large seed crop on litterfall and nitrogen retranslocation in Himalayan oaks
复制标题
异常大的种子作物对喜马拉雅橡树凋落物和氮再转移的影响
DOI：
10.1016/0378-1127(90)90162-5
复制
发表时间：
1990
影响因子：
3.7
通讯作者：
G. Negi
中科院分区：
文献类型：
--
作者：
S. Singh;Y. Rawat;B. S. Rana;G. Negi
我们分析了喜马拉雅中部两种橡树(Quercus leucotricophoraA.)异常大的种子产量的影响。加缪和Q。FloribundaLindl.)衰老叶片凋落物和养分再转运的研究。在种子大丰收的年份，肥大作物的生长减少了叶原基的形成，因此第二年春天芽开放时对碳水化合物和养分的需求减少了。因此，较少的碳水化合物和养分从老叶中转移出来，延缓了它们的衰老，延长了它们的寿命，减少了落叶。在第二年，凋落物量大且高度集中；夏季凋落物的数量明显多于正常年份的夏季。在种子大丰收后的第二年，衰老叶片中氮素的再转移大约是正常年份的两倍。
We analyzed the effect of an unusually large seed crop in the two Central Himalayan oak species (Quercus leucotrichophoraA. Camus andQ. floribundaLindl.) on litterfall and nutrient retranslocation from senescent leaves. In the year of the large seed crop, the developing mast-crop reduced the formation of leaf primordia, so demand for carbohydrates and nutrients was reduced the following spring when buds opened. Because of this, less carbohydrates and nutrients were translocated from old leaves, delaying their senescence, lengthening their life-span and reducing leaf-fall. In the following year, litterfall was massive and highly concentrated; the amounts of summer litterfall were significantly greater than in the summer season of normal years.Retranslocation of nitrogen from the senescent leaves in the year following the large seed crop was approximately double that recorded in a normal year.