اثر کم آبی بر زنده مانی، رشد، تبادلات گازی و روابط آبی نهال های سرو نقره ای و سرو شیراز | ||
| خشک بوم | ||
| مقاله 5، دوره 8، شماره 1، شهریور 1397، صفحه 49-58 اصل مقاله (2.15 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.29252/aridbiom.8.1.49 | ||
| نویسندگان | ||
| مرتضی روکی1؛ مسعود طبری کوچکسرایی* 2؛ سید احسان ساداتی3 | ||
| 1دانش آموخته کارشناسی ارشد، گروه جنگلداری، دانشکده منابع طبیعی و علوم دریایی نور، دانشگاه تربیت مدرس | ||
| 2استاد گروه جنگلداری، دانشکده منابع طبیعی و علوم دریایی نور، دانشگاه تربیت مدرس | ||
| 3استادیار مرکز تحقیقات کشاورزی و منابع طبیعی استان مازندران، سازمان تحقیقات، آموزش و ترویج کشاورزی | ||
| چکیده | ||
| امروزه توسعه فضای سبز با گونههای زینتی جنس سرو در بسیاری از نقاط کشور، به ویژه مناطق خشک، بسیار رایج است. با توجه به محدودیت منابع آب در مناطق خشک، تحقیقات در مورد پاسخ این گونهها به مسئله خشکی ضروری است. این تحقیق با هدف بررسی چگونگی پاسخهای زندهمانی، رشد، تبادلات گازی و روابط آبی نهالهای دو گونه سرو نقرهای (Cupressus arizonica) و سرو شیراز (C. sempervirens var. fastigiata) به شرایط کم آبی انجام شد. تحقیق در قالب طرح بلوکهای کامل تصادفی با سه سطح آبیاری (سه، شش و نه روزه) در سه تکرار انجام شد. نتایج نشان داد که کمآبی بر بیشتر صفات مورد مطالعه نهالها اثر معنیدار داشت، بهطوریکه زندهمانی نهالهای سرو شیراز در دوره آبیاری نه روزه افت 2/50 درصدی پیدا کرد. این در حالی است که در سرو نقرهای، هیچ نهالی دچار مرگومیر نشد. با اعمال خشکی، رویش‌های طولی و قطری در هر دو گونه کاهش قابل توجهی یافت اما نهالهای سرو نقرهای، رویش طولی بیشتری (در آبیاری شش روزه 47 درصد و در آبیاری نه روزه 43 درصد) نسبت به نهالهای سرو شیراز دارا بود. با افزایش خشکی، فعالیتهای فتوسنتز، هدایت روزنهای و پتانسیل آبی نهالها با کاهش مواجه شدند، ولی مقدار غلظت CO2 بین سلولی (Ci) و دمای برگ تغییری نکرد. تعرق و محتوای نسبی آب برگ به میزان قابل ملاحظهای در هر دو گونه کاهش یافت اما در سرو نقرهای کاهش تعرق در آبیاری شش روزه، 12 درصد و در آبیاری نه روزه، 3/32 درصد کمتر از سرو شیراز بود. در مجموع، میتوان اظهار داشت که نهال سرو نقرهای نسبت به تنش کمآبی مقاومتر از نهال سرو شیراز است. | ||
| کلیدواژه‌ها | ||
| پتانسیل آبی؛ آبیاری؛ سرو؛ غلظت CO2 بین سلولی؛ محتوای نسبی آب | ||
| عنوان مقاله [English] | ||
| Effect of water deficit on survival, growth, gas exchange and water relations of Cupressus arizonica and C. sempervirens var. fastigiata seedlings | ||
| نویسندگان [English] | ||
| M. Rooki1؛ M. Tabari Kouchaksaraei2؛ S. E. Sadati3 | ||
| 1M.Sc. Graduated of Forestry, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, Iran | ||
| 2Professor, Department of Forestry, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, Iran | ||
| 3Assistant Professor, Researches Center of Agriculture and Natural Resources, Agricultural Research, Education and Extension Organization (AREEO), Sari, Iran | ||
| چکیده [English] | ||
| Nowadays, the development of green space with ornamental species of cypress is a common in different dry areas of Iran. Regarding the limitation of water resources in dry areas, study on the response of cypresses to drought is essential. This study was carried out to recognize the responses of survival, growth, gas exchange and water relations in seedlings of two cypress species (Cupressus arizonica and C. sempervirens var. fastigiata) under water deficit condition in greenhouse. The experiment was conducted as complete randomized block design with different watering levels (3, 6 and 9 days) in three replicates. Results showed that water deficit had a significant effect on most of the traits measured in seedlings. Survival of C. sempervirens at 9-day irrigation was decreased about 50.2% but in C. arizonica seedling no mortality was detected in each watering level. During drought application, shoot growth and diameter growth in both species prominently decreased, while at 6- and 9-day irrigation, shoot growth in C. arizonica was 43-47% greater than that in C. sempervirens. With increasing drought, photosynthesis activity, stomotal conductance and water potential decreased but intracellular CO2 concentration (Ci) and leaf temperature did not change. Transpiration rate and relative water content (RWC) of leaf were significantly decreased in both species, but in C. arizonica the decrease of transpiration rate at 6- and 9-day irrigation was 12-32/3% less than that in C. sempervirens. Generally, it can be stated that C. arizonica seedling is more tolerant than C. sempervirens seedling under drought stress. | ||
| کلیدواژه‌ها [English] | ||
| CO2 Concentration of Intracellular, Cypress, Irrigation, Relative Water Content, Water Potential | ||
| مراجع | ||
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