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착과량 수준 및 생육성기 토양수분 함량 변화에 따른 후지/M.9 품종의 수액이동 특성
박정관 ( Jeong Gwan Park ),김승희 ( Seung Heui Kim ),이인복 ( In Bok Lee ),박진면 ( Jin Myeon Park ) 한국환경농학회 2006 한국환경농학회지 Vol.25 No.2
This study was conducted for 10 days from 17 July to 26 July in 2005 to measure the amount of xylem sap flow under short-term variation of soil moisture regimes at -20 kPa, -50 kPa and -80 kPa in eight-year-old `Fuji`/M.9 apple trees with different fruit loads. Fruit load was adjusted as three different treatments with standard (100%), 1/2 times (50%) and 2 times (200%) on the basis of optimum fruiting number per tree as the standard fruit load of Fuji cultivar. Trees with standard fruit load during the experimental period showed higher xylem sap flow at -50 kPa of soil moisture regimes than those of trees with 1/2 times and 2 times fruit load. Trees with 1/2 times and 2 times fruit load had similar patterns of the diurnal changes of xylem sap flow, vapor pressure deficit (VPD), and maximum evapotranspiration (ETm). However, trees with 2 times fruit load at -50 kPa and -80 kPa of soil moisture regimes produced lower amount of xylem sap flow than ETm. Trees with standard fruit load produced 1.06~3.93 L/tree more amount of xylem sap flow than ETm at all soil moisture regimes. But xylem sap flow of trees with 2 times fruit load had 21% lower at -50 kPa and 31~36% lower at -20 kPa and -80 kPa of soil moisture regimes, respectively than that of trees with standard fruit load. Shoot growth and leaf area were significantly the highest in trees with standard fruit load while those of trees with 2 times fruit load recorded significantly lowest. Leaf water potential of trees with standard fruit load was lower than that of trees with 1/2 times and 2 times fruit load. It indicated that trees with standard fruit load had higher water use for transpiration than other treatments and trees with 2 times fruit load received more stress for the transpiration process under low soil moisture regimes. Consequently, `Fuji`/M.9 apple trees, the fruit load and soil moisture should be maintained optimum to increase xylem sap flow and transpiration during higher growth period.
박정관(Jeong-Gwan Park),김선규(Seon-Kyu Kim),이재영(Jae-Young Lee),김승희(Seong-Hee Kim),신용억(Yong-Uk Shin) 한국원예학회 2004 원예과학기술지 Vol.22 No.3
This trial was conducted to find out the amount and velocity of xylem sap during growing season in four-year-old ‘Fuji’/M.9 apple trees. The total amount and average velocity of xylem sap from April 4 to October 20 were 566.5 Lㆍtree?¹ and 12.9 ㎝ㆍhr?¹ - tree?¹, respectively. Xylem sap increased from April, peaked in May and again in August, then decreased to the same level as April. Weather conditions affected xylem sap transport because the transport showed similar tendency with vapor pressure deficit (VPD) value from mid June to late September. As comparing the relationship between xylem sap transport in a day and weather conditions according to growing stage or time, the xylem sap transport of early or later stage was more affected by the degree of tree growth than weather conditions. However, it could be thought that the transport from June to August was chiefly affected by weather conditions.