摘要
准确定量描述植物气孔对环境的响应是了解植物光合作用机理、预测植物生产力及其大气 -植被 -土壤系统中水分和热量交换的关键。利用松嫩平原盐碱化草地羊草光合生理特征的野外观测数据 ,分析了羊草叶片气孔导度对环境因子的反应 ,结果表明 :羊草叶片气孔导度对环境因子变化敏感 ,尤其对瞬时光合有效辐射 (PAR)、叶片与空气间的水汽压亏损 (VPD )和空气温度 (Ta)反应十分明显。依据野外实测资料对国际上两类代表性气孔导度模型验证表明 ,Jarvis模型比 Ball模型更适于羊草叶片气孔导度模拟。据此建立的适用于羊草草原的羊草叶片气孔导度对环境因子的响应模型gs=PAR (- 2 .0 1Ta2 + 147.74Ta - 2 32 1.11) / ((4 44 .6 2 + PAR) (- 5 38.0 4+ VPD) )为定量探讨羊草叶片气孔习性 ,进一步模拟叶片光合作用和通过尺度化模拟羊草群落、区域尺度的生态系统生产力以及土壤 -植被 -大气系统之间的水热交换奠定了基础。
Detailed measurements of leaf stomatal conductance and photosynthesis of Aneurolepidium chinense were used to analyze the relationship between stomatal conductance and environmental factors and to develop a leaf stomatal conductance model for A. chinense . The results show that leaf stomatal conductance of A. chinense is sensitive to photosynthetically active radiation ( PAR) , vapor pressure deficit ( VPD ) and air temperature ( Ta ). Stomatal conductance increased with increasing PAR and Ta and decreased with increasing VPD . Validations of Jarvis' and Ball's models based on field data of leaf stomatal conductance in A. chinense indicate that model is a better estimate of g s than Ball's. The relationship between leaf stomatal conductance( g s) and environmental factors could be expressed as:g s = PAR (-2.01Ta 2+147.74Ta-2321.11)/((444.62+PAR)(-538.04+VPD))This model will be very helpful to simulate the dynamic photosynthesis at both leaf and canopy scales and also to simulate the NPP of ecosystems and energy and water balances in the Soil Plant Atmosphere Continum (SPAC) .
出处
《植物生态学报》
CAS
CSCD
北大核心
2000年第6期739-743,共5页
Chinese Journal of Plant Ecology
基金
国家重大基础研究项目!(G19990 4340 7)
国家自然科学基金重点项目!(39730 110 )
国家自然科学基金重大项目!(393930 0 2 )
院重
关键词
气孔导度
环境因子
气孔导度模拟
羊草
Stomatal conductance, Environmental factors, Stomatal conductance simulat
