红壤坡地茶园蒸腾及其影响因子研究

用整株容器法研究了红壤坡地茶园的蒸腾作用 ,结果显示 :(1)茶园蒸腾速率具有明显的早晚低、中午高的日变化特征 ,但在不同的日期蒸腾速率日变化曲线存在一定差异。 (2 )蒸腾速率受诸多田间小气候因子的影响 ,相关分析及多元逐步回归分析表明 ,气温与净辐射是影响茶园蒸腾作用的 2个主要气象因子。 (3)蒸腾速率与叶片气孔导度关系密切 ,且随着气孔导度的增加 ,蒸腾速率增大。最后探讨了植物蒸腾驱动力及其抑制的可能性及气孔行为的调节与水分利用。

Transpiration of Tea Plants on Red Soil Slopes and Its Influencing Factors.

Based on experiments conducted at the Taoyuan Agro ecological Experimental Station,Chinese Academy of Sciences,in 2001,transpiration of tea plants on red soil slopes was studied with results showing:(1)daily variation of transpiration rate of the tea plants appeared in a shape of inverted saddle,low in the morning and evening and high at noon,and the shape of inverted saddle was changed from day to day;(2)the transpiration rate was subject to a number of micro meteorological factors on the tea plantation. Correlation analysis and multi factor successive regressional analysis revealed that air temperature and net radiation were the two major meteorological factors affecting transpiration of the tea plants;(3)transpiration rate was closely related to leaf stomatal conductivity.The former increased with the rise of the latter.Transpiration driving force, probability of controlling transpiration and regulation of stomatal acts were explored for more efficient use of water.