Effects of carbon dioxide enrichment and nitrogen supply on growth of boreal tree seedlings.
Effects of carbon dioxide enrichment and nitrogen supply on growth of boreal tree seedlings.
复制标题
二氧化碳富集和氮素供应对北方树苗生长的影响。
DOI：
10.1093/treephys/2.1-2-3.223
复制
发表时间：
1986
期刊：
影响因子：
4
通讯作者：
K. Higginbotham
中科院分区：
文献类型：
--
作者：
K. Brown;K. Higginbotham
研究了两种大气二氧化碳浓度(L 350微米、L 750微米)和3种氮素浓度(15.5 mm、1.55 mm、0.155 mM N)对杨树生物量积累和分配的影响。和白云杉幼苗萌发后在控制环境室内生长100d。氮素供应对两种植物的生物量积累、株高和叶面积均有显著影响。随着施氮量的增加，白云杉的根重比(RWR)显著增加，而杨树的RWR变化不大。增施二氧化碳显著提高了高氮条件下生长的云杉幼苗的叶片和总生物量，增加了中氮条件下幼苗的相对湿重，提高了低氮条件下生长100d的云杉幼苗的根系生物量。在三种氮素条件下，二氧化碳浓度的增加都会暂时增加杨树的生物量和树高。高氮处理杨树的根、茎、叶质量、株高和叶面积仅在收获30d时增加，低氮处理仅在50d和60d时增加。中氮处理40d后，增施CO2显著提高了杨树幼苗的株高、茎生物量和叶生物量。这些影响没有持续下去，可能是因为随着植株大小的增加，矿质养分供应开始受到限制。
The effects of two levels of atmospheric carbon dioxide (350 microl l(-1), 750 microl l(-1)) and three levels of nitrogen (15.5 mM, 1.55 mM, 0.155 mM N) on biomass accumulation and partitioning were examined in aspen (Populus tremuloides Michx.) and white spruce (Picea glauca (Moench) Voss) seedlings grown in controlled environment rooms for 100 days after germination. Nitrogen supply had pronounced effects on biomass accumulation, height, and leaf area of both species. Root weight ratio (RWR) of white spruce was significantly increased at the lowest level of nitrogen, whereas RWR of aspen did not change much with increasing levels of nitrogen. Carbon dioxide enrichment significantly increased (1) the leaf and total biomass of spruce seedlings grown in the high-N regime, (2) the RWR of seedlings in the medium-N regime, and (3) the root biomass of seedlings in the low-N regime after 100 days. Carbon dioxide enrichment of aspen temporarily increased biomass and height in all three nitrogen regimes. Root, stem, and leaf mass, height, and leaf area of aspen were increased only at the 30-day harvest in the high-N treatment and at 50 and 60 days in the low-N treatment. Height, stem biomass, and leaf biomass of aspen seedlings were significantly increased by CO(2) enrichment after 40 days in the medium-N treatment. These effects did not persist, possibly because of the onset of mineral nutrient supply limitations with increasing plant size.