نتایج جستجو برای: stipa hohenackeriana
تعداد نتایج: 521 فیلتر نتایج به سال:
In the present study, we aim to analyze the effect of grazing, precipitation and temperature on plant species dynamics in the typical steppe of Inner Mongolia, P.R. China. By uncoupling biotic and abiotic factors, we provide essential information on the main drivers determining species composition and species diversity. Effects of grazing by sheep were studied in a controlled experiment along a...
The genus Stipa is one of the largest genera Poaceae. phylogeny still poorly resolved, and main problems linked to extensive inter intrasectional hybridization. Disclosure hybridization processes a key understanding relationships between species within genus. During floristic study in feathergrass steppe ecosystems central Asia, we found challenging specimens with an interesting combination mor...
در این تحقیق اثر شدتهای مختلف برداشت از علوفه سال جاری و همچنین اثر سال( با میزان بارندگی متفاوت) بر میزان تولید علوفه 3 گونه مرتعی Stipa arabica، Oryzopsis holciformisوPoa bulbosa در سایت نیمهاستپی کوه پنج در استان کرمان در4 سال متوالی از 1386تا 1389 به منظور تعیین حد بهره برداری مناسب این گونهها، بررسی شد زیرا با توجه به تحمل میزان گونه های مرتعی نسبت به چرا، می توان حد بره برداری مناسب ا...
to assess the effects of livestock grazing on soil compaction (density changes), the trampling action of livestock was simulated. the research field was located to the south west of nazarabad in savojbolagh district, south west of tehran province. samples were annually collected based on a completely randomized design. from the triple regions (reference, key and critical) 36 cylindrical cores w...
The research presents the problem of liquidation dumps substandard raw materials zeolite-containing rocks Holinsky deposit, measures for reclamation disturbed lands. most effective way to restore ecosystems is renaturation. Time intervals succession are considered. Renaturation lands consists 6 stages. Possible dominant plants proposed options considered in detail: Stipa lessingiana, Poa platen...
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