کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4393048 1618257 2014 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Carbon and nitrogen mineralization at different salinity levels in Omani low organic matter soils
ترجمه فارسی عنوان
کربن و کانی سازی نیتروژن در سطوح شوری مختلف در خاک های کم ارگانیک عمان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


• Date palm straw strongly promoted saprotrophic fungi, even in highly saline soil.
• Manure in combination with straw led to maximum microbial biomass C contents.
• Negative salinity effects on C mineralization increased with recalcitrance.
• Salinity strongly increased N immobilization after application of date palm straw.

A 56-d incubation experiment at 30 °C was carried out to study how salinity affects C and N mineralization of composted dairy manure and date palm straw. A low- and a high-saline soil were amended with (1) manure, (2) manure + low straw, (3) manure + straw, and (4) sole straw. The microbial and fungal biomass contents are very low in Omani soil abandoned for at least 6 years. Straw application revealed a highly significant increase in microbial biomass C, but especially in ergosterol in the low-saline soil. In contrast, straw led only to an increase in ergosterol in the high-saline soil, where only the combined application of manure with straw had significant positive effects on microbial biomass C. In the high-saline soil, the sum of C mineralized reached only 55% of SOC-derived CO2–C, 65% of manure-derived CO2–C, and 75% of straw-derived CO2–C in comparison with the respective treatments of the low-saline soil. The application of straw led always to a net N immobilization, which was markedly stronger in the high- than in the low-saline soil. The increase in salinity by composted cattle manure should be considered if this fertilizer is applied to soils sensitive to changes in salinity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Arid Environments - Volumes 100–101, January–February 2014, Pages 106–110
نویسندگان
, , ,