COMPARATIVE ECOPHYSIOLOGY OF ENCELIA-FARINOSA AND ENCELIA-FRUTESCENS .1. ENERGY-BALANCE CONSIDERATIONS
COMPARATIVE ECOPHYSIOLOGY OF ENCELIA-FARINOSA AND ENCELIA-FRUTESCENS .1. ENERGY-BALANCE CONSIDERATIONS
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DOI：
10.1007/bf00397869
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发表时间：
1988-01-01
期刊：
影响因子：
2.7
通讯作者：
EHLERINGER, JR
中科院分区：
文献类型：
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作者：
EHLERINGER, JR
Encelia farinosa 和 Encelia frutescens 是干旱落叶灌木，其分布在索诺兰沙漠[美国]的大部分地区重叠。在炎热和干燥的时期，E. farinosa 的叶子利用增加的叶子反射率来降低叶子温度，而 E. frutescens 的叶子具有明显更高的叶子电导，并依靠增加的蒸腾冷却来降低叶子温度。 E. farinosa 在干燥的斜坡微生境中很常见，而 E. frutescens 仅出现在冲刷微生境中，那里有更多的土壤湿度来提供蒸腾冷却所需的水。 E. farinosa 往往不会在冲刷微生境中持续存在，因为它更容易遭受山洪爆发。讨论了增加叶片反射率与增加蒸腾冷却对叶片温度调节的影响和意义。
Encelia farinosa and Encelia frutescens are drought-deciduous shrubs whose distributions overlap throughout much of the Sonoran Desert [USA]. During hot and dry periods, leaves of E. farinosa utilize increased leaf reflectance to reduce leaf temperature, whereas leaves of E. frutescens have substantially higher leaf conductances and rely on increased transpirational cooling to reduce leaf temperature. E. farinosa is common on the dry slope microhabitats, whereas E. frutescens occurs only in wash microhabitats where greater soil moisture is available to provide the water necessary for transpirational cooling. E. farinosa tends not to persist in wash microhabitats because of its greater susceptibility to flashfloods. The consequences and significance of increased leaf reflectance versus increased transpirational cooling to leaf temperature regulation are discussed.