کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2024386 1542594 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Biotic community shifts explain the contrasting responses of microbial and root respiration to experimental soil acidification
ترجمه فارسی عنوان
تغییرات جامعه بیوتیک پاسخ های متضاد تنفس میکروبی و ریشه را به اسید سازی خاک آزمایشی توضیح می دهد
کلمات کلیدی
گروه عملکردی کارخانه، جوامع میکروبی خاک، تعاملات گیاهی و خاک، مدل های چرخه کربن، کاستی های معدنی پایه، فعالیت آنزیم خارج سلولی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش خاک شناسی
چکیده انگلیسی


• Soil acidification had contrasting effects on root and microbial respiration in grasslands.
• Soil acidification increased root respiration through enhancing belowground carbon allocation.
• Soil acidification suppressed microbial respiration through reducing total microbial biomass and enzymatic activities.
• Shifts in biotic communities dominate responses of soil respiration to soil acidification.
• Carbon cycling models should consider soil acidification as well as shifts in biotic communities.

Soil respiration is comprised primarily of root and microbial respiration, and accounts for nearly half of the total CO2 efflux from terrestrial ecosystems. Soil acidification resulting from acid deposition significantly affects soil respiration. Yet, the mechanisms that underlie the effects of acidification on soil respiration and its two components remain unclear. We collected data on sources of soil CO2 efflux (microbial and root respiration), above- and belowground biotic communities, and soil properties in a 4-year field experiment with seven levels of acid in a semi-arid Inner Mongolian grassland. Here, we show that soil acidification has contrasting effects on root and microbial respiration in a typical steppe grassland. Soil acidification increases root respiration mainly by an increase in root biomass and a shift to plant species with greater specific root respiration rates. The shift of plant community from perennial bunchgrasses to perennial rhizome grasses was in turn regulated by the decreases in soil base cations and N status. In contrast, soil acidification suppresses microbial respiration by reducing total microbial biomass and enzymatic activities, which appear to result from increases in soil H+ ions and decreases in soil base cations. Our results suggest that shifts in both plant and microbial communities dominate the responses of soil respiration and its components to soil acidification. These results also indicate that carbon cycling models concerned with future climate change should consider soil acidification as well as shifts in biotic communities.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Biology and Biochemistry - Volume 90, November 2015, Pages 139–147
نویسندگان
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