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ارزیابی قابلیت شاخصهای طیفی در بررسی تنش آبی درخت زیتون | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 13، دوره 51، شماره 1، فروردین 1399، صفحه 179-190 اصل مقاله (774.94 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2019.285004.668254 | ||
| نویسندگان | ||
| عظیمه عسگری1؛ عبدالرحیم هوشمند** 2؛ سعید برومندنسب3؛ شهره زیودار4 | ||
| 1دانشجوی دکتری، گروه آبیاری و زهکشی، دانشکده علوم آب، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
| 2دانشیار، گروه آبیاری و زهکشی، دانشکده علوم آب، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
| 3استاد، گروه آبیاری و زهکشی، دانشکده علوم آب، دانشگاه شهید چمران، اهواز، ایران | ||
| 4استادیار، گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه شهید چمران، اهواز، ایران | ||
| چکیده | ||
| طیفسنجی، امکان بررسی سریع و غیرمخرب وضعیت تنش آبی گیاه را فراهم مینماید. هدف از این مطالعه ارزیابی قابلیت چندین شاخص طیفی از جمله شاخص آب ()، شاخص نرمال آب 1-5 () و شاخص نرمال آب بر اساس انعکاس در طول موجهای 960 و 940 نانومتر ()، در بررسی وضعیت تنش آبی درخت زیتون بود. تیمارهای آزمایشی شامل دو رقم زیتون (کرونیکی و ) و چهار رژیم آبیاری (آبیاری برای تأمین 100، 85، 70 و 55 درصد از نیاز آبی گیاه) بود. نتایج نشان داد که درختان زیتون در تیمارهای متفاوت آبیاری برای تأمین 85، 70 و 55 درصد از نیاز آبی گیاه بهطور متوسط نسبت به تیمار شاهد، به ترتیب در معرض حدود 11، 15 و 20 درصد کمبود آب خاک، قرار داشتند. به دلیل مقاومت بالای درخت زیتون در برابر تنش آبی، کم آبیاری در سطح 15، 30 و 45 درصد، تأثیر معنیداری در مقدار شاخصهای طیفی مورد مطالعه نداشت. با این حال شاخصهای طیفی با شاخص محتوای نسبی آب برگ گیاه، ارتباط خطی نزدیک و معنیدار داشت (**76/0*26/0). بهطور کلی شاخص طیفی نرمال آب کمترین ضریب تبیین را با شاخص محتوای نسبی آب برگ در طول اندازهگیریها نشان داد (23-1 درصد کمتر از سایر شاخصهای مورد مطالعه). بر اساس مقدار متوسط شاخصهای طیفی و شاخص رطوبت نسبی آب برگ در طول دورهی تحقیق، شاخصهای طیفی ، ، ، ، ، و ، به ترتیب رابطهی بهتری با شاخص محتوای نسبی آب برگ زیتون نشان دادند. در نهایت میتوان بیان کرد که شاخصهای طیفی ، و میتوانند جهت بررسی سریع و غیر مخرب وضعیت تنش آبی درخت زیتون، مورد استفاده قرار گیرند. | ||
| کلیدواژه‌ها | ||
| طیف سنجی؛ شاخص طیفی؛ تنش آبی گیاه؛ محتوای نسبی آب برگ؛ درخت زیتون | ||
| عنوان مقاله [English] | ||
| Evaluation of the Capability of Spectral Water Indices for Assessing Water stress in Olive Tree | ||
| نویسندگان [English] | ||
| Azimeh Asgari1؛ Abdolrahim Hooshmand2؛ Saeed BoroomandNasab3؛ Shohre Zivdar4 | ||
| 1Ph. D. student, Irrigation and drainage department, Water science faculty, Shahid Chamran University, Ahwaz, Iran | ||
| 2Associate Professor, Irrigation and drainage department, Water science faculty, Shahid Chamran University, Ahwaz, Iran | ||
| 3Full Professor, irrigation and drainage department, Water science faculty, Shahid Chamran University, Ahwaz, Iran | ||
| 4Assistant professor, Horticulture science department, Agriculture College, Shahid Chamran University, Ahwaz, Iran | ||
| چکیده [English] | ||
| Spectrometric measurements have the potential for fast and non-destructive measurements of plant water stress. The aim of this work was to investigate the ability of several spectral water indices, including water index (WI), normalized spectral water indices 1-5 (NWI 1-5), and normalized water index based on wavelengths in 960 and 940 nm (NWI 960-940) for detection of water stress in olive trees. The experimental treatments involved two olive cultivars (Koroneiki and T2) and four water regimes (100%, 85%, 70%, and 55% of crop water requirement). Results showed that the olive trees in different water supplies 85%, 70%, and 55% of ETc were subjected to soil moisture deficit equal to 11, 15, and 20%, respectively, as compared to soil moisture of control treatment. Because of the high resistance of olive trees to water stress, water reduction at levels of 15, 30, and 45 percent did not have significant effects on spectral indices. However, spectral indices were closely and significantly linear associated with relative water content of the crop leaf (). Among all tested water spectral indices, NWI-2 showed the least consistent associations with relative water content of the leaf (ranging from 1–23% less than the ones in other tested indices). Based on the average amount of spectral indices and relative water content during the study period, NWI4, NWI5, NWI1, WI, NWI960-940, NWI3, and NWI2 showed a stronger relationship with the relative water content of olive leaves, respectively. In conclusion, spectral reflectance indices, WI, NWI 1-5, and NWI 960-940, could be useful for fast and non-destructive estimating of plant water stress. | ||
| کلیدواژه‌ها [English] | ||
| Spectrometry, Spectral Index, Plant Water Stress, relative water content, Olive Tree | ||
| مراجع | ||
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