摘要
1 引言 亚热带季风阔叶林自然林被破坏后,代之以人工林,由于自然林郁密的树冠层的消失,引起环境因素明显变化,如太阳辐射的增强,气温变幅变大,同时由于风速增大,加大了蒸腾的需要量,造成空气相对湿度降低和土壤水分亏缺,特别是在干旱季节尤为显著。该林地中除被动适应这一生境的1年生草本外,尚有灌木桃金娘(Rhodomyrtus tomentosa)。
The ^(13)C/^(12)C ratio, photosynthetic rate and stomatie conductivity of leaves of Pinus massoniana, Schima superba,Psychotria rubra, Evodia lepta and Rhodomyrtus tomentasa are measured. No significant deviation (at 5% level) is observed between water use efficiencies calculated by these items. The^(13)C/^(12)C is 25.41±0.61‰. In average for treerings of Pinus massoniana from 1971 to 1983(n=6), with the maximum in 1977 when the lowest precipitation was recorded. The average water use efficiency of Pinus massoniana is 8.28±0.38 in 1977—1983, which is higher than that of trees in natural site and might be caused by the changes of solar radiation and water condition. ^(13)C/^(12)C ratio ana lysis could provide usefull informations for studying water use efficiency of artificial forest.
出处
《应用生态学报》
CAS
CSCD
1993年第3期325-327,共3页
Chinese Journal of Applied Ecology
基金
国家自然科学基金
关键词
松树
人工林
水分利用效率
Pinus massoniana, ^(13)C/^(12)C ratio, Water use efficiency.