摘要
本文利用田间小麦叶片的气孔阻抗和同时的微气象要素观测资料,详细分析了气孔阻抗与光照强度、叶温、大气水汽饱和差之间的关系,给出了相应的统计关系;分析了气孔阻抗的日变化规律和群体内的垂直变化规律。在此基础上建立了微气象条件下的气孔阻抗日变化的拟合模式。
Studies of the response of stomatal behavior to environmental factors were conducted. It is shown that light intensity and atmospheric vapor deficit (△e) are major factors having influence on the stomatal behavor.The diurnal trend diagram of the stomatal resistance is shaped as 'W'regardless of weather types, while the maximum of the resistance atnoon its greater on sunny days than on overcast day. The whole diurnalprogram is divided into three portions: OPENING-RESPONDINGperiod, MIDNOON-REST period,and CLOSING-RESPONDING period.The diurnal shape of the resistance curve is determined by circadianrhythms and environmental factors. The resistance is higher in thelower layer than in the upper layer in the general functional formГ_s=Г_0 f(I) g(△e)…. The special forms of the individual periods are as follows: 1) OPENING-RESPONDING period and CLOSING-RESPONDINGperiod Г_s=Г_0 exp(-a_1I) (1+b_1△e) 2) MIDNOON-REST periodГ_s=1/2{ [(Г_(max)-Г_(min))/2] cos (2π(t-t_0)/T)+(Г_(max)+Г_(min))} exp(-a_2I) exp (b_2△e)
出处
《南京气象学院学报》
CSCD
1989年第1期99-105,共7页
Journal of Nanjing Institute of Meteorology