TAILIEUCHUNG - Carbon dynamics in tallgrass prairie and wheat ecosystems

Soil carbon (C) dynamics is an important aspect of the global C cycle. Soils can be a sink or source for atmospheric CO2 depending upon management. Tallgrass prairie and wheat (Triticum aestivum L.) are 2 dominant ecosystems in the Great Plains. | Turk J Agric For 28 (2004) 141-153 © TÜB‹TAK Carbon Dynamics in Tallgrass Prairie and Wheat Ecosystems Rasim KOÇY‹⁄‹T Gaziosmanpafla University, Faculty of Agriculture, Department of Soil Science, Tafll›çiftlik, Tokat - TURKEY Charles W. RICE Kansas State University, 2701 Throckmorton Plant Sciences Center, Manhattan, KS 66502 - USA Received: Abstract: Soil carbon (C) dynamics is an important aspect of the global C cycle. Soils can be a sink or source for atmospheric CO2 depending upon management. Tallgrass prairie and wheat (Triticum aestivum L.) are 2 dominant ecosystems in the Great Plains. This study determined the distribution of C in these 2 ecosystems. Soil C pools, plant root biomass, and aboveground plant biomass were determined at a wheat (winter wheat) and a tallgrass prairie site in northern Oklahoma from 1998 through 2001. The objectives of this study were to determine C storage and changes in soil organic matter in tallgrass prairie and wheat ecosystems under similar environmental conditions and soil characteristics. Soil C was assessed by measuring soil C pools (active, slow and recalcitrant). Mineralizable C and N (Co and No) were determined by long-term laboratory incubation, 314 days at 35 °C. Soil C and N content was 2 times greater in the prairie than under wheat. The greater level of Co and No occurred in prairie. Wheat had proportionally greater mineralizable C and N than did prairie, but microbial biomass was the opposite, being greater in prairie. Wheat had more dynamic C pools with a faster turnover rate than did prairie. The more dynamic C pools with a faster turnover rate in wheat was the result of the greater disturbance effects of intensive tillage practices on soil structure. Key Words: Soil carbon, carbon pools, mineralizable carbon, microbial biomass carbon, recalcitrant carbon. Yüksek Otlak ve Bu¤day Ekosistemlerinde Karbon Dinami¤i Özet: Toprak karbon (C) dinami¤inin, global C döngüsünde önemli bir yeri vard›r. .

TÀI LIỆU LIÊN QUAN
TỪ KHÓA LIÊN QUAN
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.