摘要
通过对田间土壤－植物－大气连续系统（ＳＰＡＣ）的昼夜观测，确定温度为影响ＳＰＡＣ水分运移的重要因素。随土壤温度升高土壤水势增大，显示温度对田间土壤水势的正效应，且高肥力的正效应大于低肥力。温度对小麦叶水势具有显著负效应，即小麦叶水势随气温升高而降低。温度与大气水势也呈现负相关，随着温度升高大气水势降低。温度与土壤－植物及植物－大气间水势梯度呈正相关，随气温升高。
Based on the diurnal observation of water potential in Soil Plant Atmosphere Continuum under different fertility conditions, it was showed that temperature was an importment factor affecting water movement of SPAC. Soil water potential increased with the increase of the soil temperature and this showed that the effect of temperature on water potential of soil was positive. The effect of temperature on leaf water potential of winter wheat was negative, i.e. the leaf water potential of winter wheat decreased with the increase of atmosphere temperature. There was a negative correlation between atmosphere temperature and atmosphere water potential. The water potential gradient of Soil-Plant and Plant-Atmosphere showed a high increasing trend with the increase of atmosphere temperature.
出处
《西北农业学报》
CSCD
1996年第4期49-53,共5页
Acta Agriculturae Boreali-occidentalis Sinica
基金
高等学校博士点科学基金
关键词
土壤
植物
大气连续系统
水势
温度效应
SPAC
Temperature effect on water potential
Water potential gradient
