摘要
采用美国产Ｌ１－６００便携式光合分析系统对库布齐沙地植被建种种油蒿和其它几种主要沙生植物的蒸腾作用及环境因子进行研究。结果表明，油蒿等几种天然沙生植物和羊柴等几种栽培植物的蒸腾作用有不同的特征，即油蒿等几种天然植物的蒸腾作用有午休现象，而羊柴等几种栽培植物蒸腾作用却无明显的午休现象，并且不同沙生植物蒸腾速率差异很大。油蒿表现最大蒸腾作用的时间在８月份，较地上生物量的高峰期提前一个月左右。
Census data of transpiration for Artemisia ordosica and other dominant plants in Kubuqi desert were measured with model LI 6000 photosynthesis system, and environmental factors were surveyed at the same time. The result showed that the transpiration of natural species ( Artemisia ordosica and other 4 species) has general characteristic - midday depression of transpiration, so the ecological type in light of water relation of these plants is weak midday depression type. Contrast to these natural plants, the transpiration of cultivate plants ( Hedysarum leave and other 3 species) has a general characteristic also - non obviously midday depression of transpiration, so the ecological type of these plants is non midday depression type. and the transpiration rate of different Psammophytes is different largely. The transpiration rate of Artemisia ordisica (Tr) correlates significantly ( r>r 0.01 ) with the main environmental factors such as photosynthesis active radiation(PAR)、relative humidity ( RH) and air temperature ( AT ), and the multiple regression equation is Tr=-543.49+0.048PAR+4.138RH+23.447AT (P=0.000 000 1).The transpiration is affected by lots of environmental factors and the environmental factors influence each other too. The importance of the factors are AT > RH > PAR by pathanalysis, and the air temperature is main factor which affects the transpiration of Artemisia ordisica. The maximum transpiration rate of Artemisia ordosica comes up in August, ahead of the period of maximum value of biomass one month or so .
出处
《内蒙古大学学报（自然科学版）》
CAS
CSCD
1999年第3期372-376,共5页
Journal of Inner Mongolia University：Natural Science Edition
基金
国家自然科学基金
关键词
油蒿
蒸腾作用
环境因子
库布齐沙地
沙生植物
Artemisia ordisica
Transpiration
Environmental factors
Kubuqi desert
