Using Sap Flow to Calculate Integral Water Capacity in Pistachio Trees
Author(s):
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
Integral Water Capacity (IWC), as one of the recently defined criteria for soil water availability, uses weighting functions to takes into account various soil physical limitations for calculating plant available water. Also, the weighting functions can be calculated from plant responses. In this study, in a pistachio orchard, surface (DI) and subsurface (SDI) drip irrigation systems were established, afterwards soil physical properties and water and salinity distribution in root zone were measured. IWC were calculated using soil physical properties and sap flow (SF) as one of the plant responses features. The result of plant measurements indicated that SF decreased progressively during the time between successive irrigation periods, but the decrease in DI was greater than SDI. By considering equal depth of irrigation water applied to DI and SDI, the more favorable moisture and salinity distribution in the root zone of SDI compared to DI treatment was the reason for more water availability in SDI. The calculated IWC by Groenevelt weighting function ( in DI and SDI showed the lowest amount (0.0557 and 0.0545 respectively) but values were calculated as 0.176 and 0.191, respectively, and were close to IWC calculated without any salinity effect (0188 ). Van Genuchten equation led to more realistic estimates of salinity limitations on water availability ( were obtained as 0.146 and 0.151 ) and the integral energy based on was very close to integral energy calculated by SF. These findings indicate that the salinity weighting functions used in had the best estimates of soil physical conditions to consider water uptake energy and plant water availability. It is found that based on all soil water availability criteria, SDI provided more available water and less integral energy than DI.
Keywords:
Language:
Persian
Published:
Iranian Journal of Soil Research, Volume:34 Issue: 1, 2020
Pages:
95 to 109
https://magiran.com/p2157567
دانلود و مطالعه متن این مقاله با یکی از روشهای زیر امکان پذیر است:
اشتراک شخصی
با عضویت و پرداخت آنلاین حق اشتراک یکساله به مبلغ 1,390,000ريال میتوانید 70 عنوان مطلب دانلود کنید!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی نامحدود همه کاربران به متن مطالب تهیه نمایند!
توجه!
- حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران میشود.
- پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانههای چاپی و دیجیتال را به کاربر نمیدهد.
In order to view content subscription is required
Personal subscription
Subscribe magiran.com for 70 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!