نشریه علمی - پژوهشی مرتع و آبخیزداری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد مدیریت مناطق بیابانی، دانشگاه تهران، ایران.

2 استاد، دانشکده منابع طبیعی، دانشگاه تهران، ایران.

3 دانشیار پژوهشی ، بخش تحقیقات جنگل و مرتع، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان یزد، سازمان تحقیقات، آموزش و ترویج کشاورزی، یزد، ایران.

چکیده

مهم‌ترین عامل مؤثر بر کیفیت علوفه گیاهان، مرحله فنولوژی است که با شناخت آن می­توان زمان مناسب چرای دام در مرتع را تعیین کرد. در این پژوهش، از چهار گونه مهم مرتعی، شامل درمنه دشتی (Artemisiasieberi)، آنک (Salsolakerneri)، عجوه (Aelieniasubaphylla) و سفید جاز (Eurotiaceratoides) در سه مرحله فنولوژی؛ رشد رویشی، گلدهی و بذردهی در اواخر 1389 و اوایل 1390 در مراتع ندوشن استان یزد نمونه‌برداری به عمل آمد. در هر مرحله، برای هر گونه 5 تکرار و برای هر تکرار، حداقل پنج‌پایه گیاهی از نقاط مختلف تیپ گیاهی موجود در منطقه انتخاب و رشد سال جاری آن‌ها برداشت گردید. نمونه­ها پس از خشک شدن و جدا نمودن اندام­های مختلف (گل، برگ و ساقه) آسیاب شدند و در آزمایشگاه با روش­ طیف‌سنجی مادون‌قرمز NIR)) مورد تجزیه قرار گرفتند و شاخص­های مهم کیفی از قبیل پروتئین خام (CP)، دیواره سلولی عاری از همی سلولز (ADF)، ماده خشک قابل‌هضم (DMD) و انرژی متابولیسمی (ME) آن‌ها تعیین گردید. نتایج بررسی نشان داد که بالاترین درصد پروتئین خام مربوط به برگ A. subaphylla و در مرحله رویشی (19/9%)، بالاترین درصد ADF مربوط به ساقه A. subaphylla و در مرحله بذردهی (42/53%) و بالاترین درصد DMD(13/48%) و بالاترین مقدار انرژی متابولیسمی (18/6MJ/KgDM) مربوط به برگ A. sieberi و در مرحله رویشی است. همچنین اواخر دوره رویشی را مناسب‌ترین زمان برای چرای دام می­توان در نظر گرفت.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of the Quality of Plant Species Parts in Different Phenological Stages Using NIRs (Case Study: Rangelands of Nodooshan-Yazd)

نویسندگان [English]

  • razie shahbandari 1
  • Hossein Arzani 2
  • naser baghestani meybodi 3
  • Mohammad Ali Zare Chahouki 2

2 tehran university, tenure, pasture phd

چکیده [English]

The most important factor affecting forage quality is phenological stage that if it is recognized correctly, the appropriate grazing time will be determined. In this study, four species including Artemisia sieberi, Salsolakerneri, AelieniasubaphyllaandEurotiaceratoides in different phenological stages (vegetative, flowering and seedling) were sampled. Samples were taken from the rangelands of Nodooshan-Yazd in 1389 and 1390. At each stage, five replicates for each plant species were selected and at least five vegetable bases from different locations of vegetation type in the region were selected. Samples were grinded after drying and separating different parts (flower, leaf and stem) and then they were analyzed using infrared spectroscopy in the laboratory. Important indicators of quality such as crude protein (CP), acid detergent fiber (ADF), dry matter digestibility (DMD) and metabolic energy (ME) were determined. Results showed that the highest percentage of crude protein is found in leaves of A. subaphyllaand in vegetative stage (9.19%), highest percentage of ADF is in shoot and in seedling stage (53.42%) and the highest percentage of DMD (48.13%) and the highest amount of metabolic energy (6.18 MJ/KgDM) is in leaves of A. sieberi and in vegetative stage, respectively. The end of the vegetative period can be considered the best time for grazing.

کلیدواژه‌ها [English]

  • Nir
  • quality
  • Plant Species Parts
  • Phenological Different Stages
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