摘要
利用土壤水分张力计监测土壤水分吸力的变化 ,以灌水时 30cm土层的土壤水分吸力表示渗灌灌水下限 ,研究灌水下限为 10、16、2 5、4 0和 6 3kPa时对塑料大棚番茄生长和产量的影响 .结果表明 ,番茄株高、生物量分别随灌水下限的增大而减小 .番茄的产量和水分利用率与灌水下限间的关系曲线为抛物线 ,而茎粗 /株高比与灌水下限间的关系曲线为三次多项式曲线 .灌水下限不同 ,番茄的根 /冠比 (R/S)动态不同 ,番茄根系与株冠的生长状况不同 .灌水下限在 2 5～ 33kPa时 ,番茄植株生长健壮 ,根冠比例协调 ,产量大 ,水分利用率高 .此指标作为渗灌灌水下限 ,灌水时土壤水分的含量比常规灌水低 ,灌水次数少 ,有利于提高保护地番茄栽培的水分利用率和劳动生产率 .
A subsurface drip irrigation experiment was conducted in a plastic tunnel to study the effects of different lower limits of subsurface drip irrigation on tomato growth and its yield.The lower limits of subsurface drip irrigation were expressed by soil water suctions detected by tensiometers placed in 30 cm soil layer.The designed values of soil water suction in this experiment were 10,16,25,40 and 63 kPa,respectively.The results showed that the height and biomass of tomato plant decreased significantly with increasing lower limits of subsurface drip irrigation.Parabolic regression curves were suitable to simulate the relationships of stem diameter of tomato plant,yield,and water use efficiency (WUE) with lower limits of subsurface drip irrigation.The relationship between the ratio of stem diameter to plant height of tomato and lower limit could be simulated by three-dimensional multinomial regression curve.The growth of tomato root and shoot and their ratio(R/S) varied under different lower limits of subsurface drip irrigation.The tomato plant grew well,R/S was favorable,and the yield and WUE were higher when soil water suction was in the range of 25～33 kPa.When this range was served as the criteria for subsurface drip irrigation,the soil water content at the beginning of irrigation should be lower,and the irrigation frequency should be fewer than that of conventional irrigation.This range of soil water suction was in favor of improving the WUE and decreasing labor cost for tomato cultivation in plastic tunnel.
出处
《应用生态学报》
CAS
CSCD
2004年第5期767-771,共5页
Chinese Journal of Applied Ecology
基金
中国科学院知识创新工程重要方向项目 (KZCX SW 416 0 2 )
中国科学院王宽诚博士后工作奖励基金资助项目 ( 2 0 0 2
No 2 9)
关键词
渗灌
灌水下限
土壤水分吸力
生长发育
产量
塑料大棚
Subsurface drip irrigation, Lower limit of irrigation, Soil water suction, Growth, Yield, Plastic tunnel.
