红薯光合特征对土壤透气性的响应

Responses of sweet potato's photosynthetic characteristics to soil permeability

通过盆栽试验研究了不同土壤质地和水分条件下红薯光合特性对土壤透气性的响应。结果表明:土壤透气性显著影响红薯叶片蒸腾速率和水分利用效率,随土壤透气性的增加,蒸腾速率显著降低,水分利用效率显著增加,红薯的光合作用不受土壤透气性的影响;透气性对红薯蒸腾和水分利用效率的影响与土壤质地有关,在沙土质地下,红薯的光合速率、蒸腾速率和水分利用效率均不受透气性影响,而在壤土质地下,红薯的蒸腾速率随透气性的增加显著降低,而水分利用效率显著增加;透气性对红薯光合特性的影响与生育期有关,不同生育期内,红薯光合特征对土壤透气性的响应也不同。研究表明,在分析作物对土壤透气性的响应时,需要考虑土壤质地、水分条件和生育期的影响。

Soil permeability had great effect on the growth and the water use efficiency of sweet potato . In this study ,responses of photosynthetic characteristics of sweet potato to soil permeability in different soil textures and soil wa-ter conditions were observed through a pot experiment .Results indicated that soil permeability had significant effect on the transpiration rate and water use efficiency of sweet potato .When the soil permeability became increased ,the transpi-ration rate became decreased ,but the water use efficiency was increased .Also ,it seemed that soil permeability did not affect the photosynthetic rate of sweet potato .In addition ,it was found that the effects of soil permeability on the transpi-ration rate and water use efficiency were related to soil compositions .Permeability of sandy soil showed no effect on pho-tosynthetic rate ,transpiration rate ,and water use efficiency .However ,loam soil decreased the transpiration rate and in-creased the water use efficiency .The effects of soil permeability on the photosynthetic characteristics were also related to the growth period of sweet potato ,resulting in various response patterns .These results showed that the impacts of soil texture ,water ,and growth period must all be taken into consideration when analyzing the responses of crops to soil per-meability .