کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8362775 | 1542563 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Responses of soil microbial community to continuous experimental nitrogen additions for 13 years in a nitrogen-rich tropical forest
ترجمه فارسی عنوان
واکنش جامعه میکروبی خاک به افزودن نیتروژن به طور مداوم تجربی برای 13 سال در یک جنگل گرمسیری غنی از نیتروژن
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کلمات کلیدی
رسوب نیتروژن، بیوماس میکروبی، ترکیب جامعه میکروبی، اسیدهای چرب فسفولیپید، فعالیت آنزیمی خارج سلولی، جنگل استوایی،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش خاک شناسی
چکیده انگلیسی
Intensified anthropogenic activities will increase rates of nitrogen (N) deposition over the next decades, especially in the tropics. There are urgent needs to know how soil microbial community in N-rich tropical forests responds to long-term N deposition. This study examined effects of long-term N additions on soil microbial biomass (determined by chloroform fumigation), microbial community composition (based on phospholipid fatty acids, PLFAs), and microbial enzyme activities, using an ongoing experimental N additions field in an N-rich tropical forest of South China. There were four N additions levels: no additions (Control); 50â¯kgâ¯N haâ1 yrâ1 (Low-N); 100â¯kgâ¯N haâ1 yrâ1 (Medium-N), and 150â¯kgâ¯N haâ1 yrâ1 (High-N). Results showed that long-term N additions significantly decreased microbial biomass carbon (MBC) and nitrogen (MBN), but had little effects on total PLFAs. However, elevated N inputs significantly reduced the relative abundance of bacterial PLFAs, especially gram-negative bacterial PLFAs with higher gram-positive bacteria: gram-negative bacteria ratio in N treatment plots. Although N additions did not change fungi: bacteria ratio, the proportion of arbuscular mycorrhizal fungi increased significantly with N additions. Long-term N additions greatly increased bacterial stress indexes and enhanced specific enzyme activity (activity per unit of microbial biomass) involved in carbon, nitrogen and phosphorus mineralization. Meanwhile, shifts in microbial community composition and specific enzyme activity were correlated well with soil pH and available N. These results suggest that N-mediated environmental stresses can play an important role in shaping microbial community, and that soil microbes will invest more resources on enzyme production in N-rich forest under elevated N deposition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Biology and Biochemistry - Volume 121, June 2018, Pages 103-112
Journal: Soil Biology and Biochemistry - Volume 121, June 2018, Pages 103-112
نویسندگان
Cong Wang, Xiankai Lu, Taiki Mori, Qinggong Mao, Kaijun Zhou, Guoyi Zhou, Yanxia Nie, Jiangming Mo,