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2022 Vol.40, Issue 2 Preview Page

Research Article

Diurnal Variation Characteristics of Sap Flow in Kimchi Cabbage and of Air Temperature and Relative Humidity near the Surface of Cultivated Soil

배추 수액 흐름 및 배추 재배 토양 근접 위치 온습도의 일변화 특성

Ki-Deog Kim1
,
Jong-Tack Suh1
,
Chang-Seok Kim1
,
Sam-Nyu Jee1
,
Soon-Choon Hong1
,
Su-Jeong Kim1
,
Jung Hwan Nam1
,
Jong-Nam Lee1
,
Hwang-Bae Sohn1*
김 기덕1
,
서 종택1
,
김 창석1
,
지 삼녀1
,
홍 순춘1
,
김 수정1
,
남 정환1
,
이 종남1
,
손 황배1*
1Highland Agriculture Research Institute, National Institute of Crop Science, Rural development Administration, Pyeongchang 25342, Korea
1국립식량과학원 고령지농업연구소
*Corresponding Author
30 April 2022. pp. 157-167
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Abstract

In this study, sap flow of Kimchi cabbage was affected the most by solar radiation, but it was not completely consistent. In addition, it was judged to be somewhat affected by other weather environmental factors such as temperature, soil temperature, wind speed, relative humidity, and vapor pressure deficit. Sap flow of Kimchi cabbage was affected by changes in soil temperature in the root stalk and solar radiation in the leaves. The effect of soil moisture on sap flow was not sensitive in the range of available soil moisture conditions, while it showed different patterns according to the measurement location, leaf aging, and extreme weather conditions. The ratio of evapotranspiration calculated from sap flow and from the positive relationship between them was presented as an irrigation signal. When the soil moisture was sufficient, the temperature and humidity measured at the top 1 cm of the ground surface adjacent to the cabbage followed the general pattern of temperature and humidity change in the air, and the opposite result was obtained when the soil moisture was insufficient. Therefore, it was determined that the abnormal change signal of the temperature and humidity near the surface of the Kimchi cabbage cultivated soil can be used as an indicator for determining the soil moisture state.

Keywords
evapotranspiration
irrigation
microclimate
soil radiation
soil water

수액 흐름은 일사량의 영향을 가장 크게 받았으나 그 증가가 완전히 비례적이지는 않았다. 이는 기온, 지온, 풍속, 상대 습도 등 다른 기상 환경 요인이 수액 흐름에 영향을 미치기 때문이다. 배추의 수액 흐름은 근경에서는 지온의 변화와 유사하였으며, 잎에서는 일사량의 변화와 유사하였다. 특히 수액 흐름에 미치는 토양 수분의 영향은 유효 수분 조건 범위에서는 수액 흐름의 민감하지는 않았으나 토양 수분 변화에 따라 수액 흐름이 반응을 하였다. 잎의 노화, 측정위치, 극한 기상 상태에 따라 수액 흐름이 달랐다. 수액 흐름과 증발산량은 정의 상관을 보였으며, 이들의 관계로부터 산출된 수액 흐름을 이용한 증발산량과 기상에 기반을 둔 증발산량의 비가 1.25일 때 관수 시점임을 확인하였다. 아울러 토양 수분이 충분할 때에 배추 인접 지표면의 상단 1cm 높이에서 측정한 온습도는 습공기의 일반적인 온습도 변화 양상을 따랐고, 토양수분이 부족한 경우에는 반대의 결과를 나타냈다. 따라서 배추 재배 토양의 표면 근접 온습도의 이상 변화는 토양 수분 상태를 판단하는 지표로 이용할 수 있을 것으로 판단된다.

키워드
증발산량
관수
미기상
일사량
토양수분
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Information
  • Publisher :KOREAN SOCIETY FOR HORTICULTURAL SCIENCE
  • Publisher(Ko) :원예과학기술지
  • Journal Title :Horticultural Science and Technology
  • Journal Title(Ko) :원예과학기술지
  • Volume : 40
  • No :2
  • Pages :157-167
  • Received Date : 2021-08-18
  • Revised Date : 2021-10-21
  • Accepted Date : 2021-11-24
  • DOI :https://doi.org/10.7235/HORT.20220015
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