人类活动对亚热带森林大气CO2浓度及两种木本植物碳水化合物含量的影响

研究了包括旅游、宗教活动及工厂废气等不同类型的人类活动对亚热带森林大气CO₂浓度及两种木本植物荷木和马尾松碳水化合物代谢的影响.结果表明,人类不同形式的活动不但影响了CO₂日进程变化,而且使CO₂的垂直分布发生了改变.与对照相比,人类活动引起森林大气(5～15m)CO₂上升了4～11μl·L^-1.马尾松和荷木叶片的可溶性糖和非结构性碳水化合物随人类活动的加强而下降,其下降趋势与CO₂上升趋势基本一致.树木上层(15m)叶片的可溶性糖和淀粉受影响较明显,纤维素含量受人类干扰相对较小.荷木和马尾松的碳水化合物代谢对人类活动的响应不同.

Effect of human activities on atmospheric CO2 concentration in subtropical forests and carbohydrate content of two species of woody plants

This paper dealt with the effect of human activities including tourism, religion activity, and industrial waste gas on atmospheric CO₂ concentration of subtropical forests and carbohydrate content of two species of woody plants: Schima superba and Pinus massoniana. The results show that human activities not only changed the daily variation, but also the vertical distribution of CO₂ within forests. Comparing to control site (core area of Biosphere Reserve),the CO₂ concentration in disturbed sites is increased 4～11 μl·L^-1.The total contents of soluble sugars and non structural carbohydrate in leaves of two woody plants are decreased with increasing intensity of human activities, and the trends of decrease are consistent with increasing CO₂ concentration. The contents of soluble sugars and starch are more sensitive to human activities in upper canopy than in lower canopy. On the other hand, human activities show little influence on the content of cellulose in leaves of forest trees. The different response of carbohydrate metabolism to human activities was observed between Schima superba and Pinus massoniana.