Is Available Carbon Limiting Microbial Respiration in the Rhizosphere?

نویسندگان

  • WEIXIN CHENG
  • QIANGLI ZHANG
  • DAVID C. COLEMAN
  • CAROL A. HOFFMAN
چکیده

It is widely known that the carbon availability in the rhizosphere is much higher than in the bulk soil. However, studies have failed to show whether microbial respiration in the rhizosphere is carbon-limited. Precise and timely measurements are lacking. We measured carbon availability index (basal respiration divided by substrate-induced respiration), and water soluble carbon in soils sampled at four spatial points (rhizoplane, rhizosphere, bulk soil and root-free soil) in the rhizosphere continuum in greenhouse and field experiments. Carbon availability index and water soluble carbon were inversely related to the relative distance from the root surface, with several times higher concentrations in the rhizoplane soils. Microbial respiration was not limited by available carbon in the rhizoplane and in the rhizosphere. Copyright

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

The Effect of Fruit Trees Pruning Waste Biochar on some Soil Biological Properties under Rhizobox Conditions

The pyrolysis of fruit trees Pruning waste to be converted to biochar with microbial inoculation is a strategy improving the biological properties in calcareous soils. In order to investigate the biochar effect on some soil biological properties of the soil in the presence of microorganisms, a factorial experiment was carried out in a completely randomized design in the rhizobox under greenhous...

متن کامل

ارزیابی تأثیر تلقیح کرم خاکی Eisenia foetida و کاربرد مواد آلی مختلف بر برخی شاخص‌های کیفیت بیولوژیک خاک در شرایط گلخانه‌ای

Earthworms are considered as one of the soil quality and health indicators. In order to evaluate the effects of earthworms activity on some soil biological quality indicators, an experiment was carried out in greenhouse conditions with different organic materials including trees’ pruning waste compost (PWC), wheat straw (WS), herbal extracts waste (HEW), trees’ pruning waste (PW) in...

متن کامل

اثر شوری بر برخی شاخص‌های میکروبی خاک در حضور و عدم حضور ریشه‌های زنده گیاه

Similar to plants, soil salinity may reduce microbial growth and activities in different ways. The aim of this study was to determine the effects of different levels of salinity on some microbial indices in the presence and absence of plant's living roots. In this study, five levels of salinity using NaCl, CaCl2, MgCl2 and KCl and three soil media (soil with no plant, soil cultivated with wheat...

متن کامل

اثرهای ریزوسفری گندم (Triticum aestivum L.) بر قابلیت استفاده فسفر و برخی از ویژگی‌های بیولوژیک در خاک‌های آهکی دشت شهرکرد

The chemical conditions of the rhizosphere are known to considerably differ from those of the bulk soil, as a consequence of a range of processes that are induced either directly by the activity of plant roots or by the activity of rhizosphere microflora. Plant species have involved various adaptive strategies to acquire P from soil pools. Therefore, the objective of this research was to evalua...

متن کامل

تغییر در قابلیت استفاده و شکل‌های شیمیایی روی در ریزوسفر لوبیا (Phaseolus vulgaris L.) در تعدادی از خاک‌های آهکی

Rhizosphere is a micro zone with profoundly different microbiological and chemical properties compared to the bulk soil, where availability and fractionation of zinc (Zn) may also vary from the bulk soil. This greenhouse research was performed to study the available Zn and its fractions in the bean rhizosphere and bulk soils of 10 calcareous soils using rhizobox. Total organic carbon (TOC), dis...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2003