核心期刊网首页> 外文会议> 农林牧渔

Effects of nitrogen addition and increased precipitation on soil hydrolytic enzyme activities in a temperate meadow steppe


Soil extracellular enzymes are the proximal drivers of organic matter decomposition via mineralizing organic matter and releasing carbon and nutrients in forms that can be assimilated.This process can be greatly affected by the change of temperature, precipitation, and other environmental factors.However, few experiments have been conducted to study the responses of hydrolase activities to the interaction of nitrogen (N) deposition and precipitation.The main purpose of this study was to investigate the change of soil hydrolytic enzyme activities in a Stipa baicalensis meadow steppe with a complete randomized block factorial experimental design with the N addition, the increased precipitation and a combination of N and precipitation increase in northeastern China.These hydrolases included carbon-acquisition enzymes (α-glucosidase, αG;β-glucosidase, βG;β-xylosidase, βX;Cellobiohydrolase, CBH), nitrogen-acquisition enzymes (N-acetylglucosaminidase, NAG;Leucine aminopeptidase, LAP), and phosphorus-acquisition enzymes (acid phosphatases, aP).The results showed that N addition just significantly increased the activity of NAG and increased precipitation had no significant effect on all hydrolase activities, N addition and increased precipitation had significantly interactive effects on the activity of βX and CBH.However, single N addition resulted in an increase in the activity of NAG, βG, βX and CBH, as well as the content of soil organic carbon (SOC), soil total N (TN), soil available N (AN) and soil moisture (SM).But, all the significant effects disappeared when precipitation synchronously increased.On the other side, single increased precipitation led to the obvious increase of SOC, TN and AN, and the change of precipitation had no significant effects on hydrolytic enzyme activities in all plots.Correlation analysis demonstrated that soil properties enormously influenced NAG but had relatively weak effects on the activity of other enzymes.Redundancy analysis indicated that the patterns of hydrolase activities were mainly driven by soil pH, SOC and TN.Overall, our results suggested that the variation of carbon-acquisition and nitrogen-acquisition hydrolase activities caused by N addition was offset by the effects of increased precipitation.Furthermore, the differential responses of hydrolases to N addition and increased precipitation may have important implications for carbon and nutrient cycling under the conditions of global change in the future.......

【作者名称】: Jian Li, Fu Xing, Wenjing Li, Xin Liu
【作者单位】: Key Laboratory for Vegetation Ecology of the Ministry of Education, Northeast Normal University, Changchun,Jilin 130024, China, Key Laboratory for Vegetation Ecology of the Ministry of Education, Northeast Normal University, Changchun,Jilin 130024, China, Key Laboratory for Vegetation Ecology of the Ministry of Education, Northeast Normal University, Changchun,Jilin 130024, China, Key Laboratory for Vegetation Ecology of the Ministry of Education, Northeast Normal University, Changchun,Jilin 130024, China
【关 键 词】: soil enzyme activity, N deposition, precipitation, meadow steppe
【会议名称】: The 5th China-Japan-Korea Grassland Conference: Knowledge Innovation of Grassland Science and Sustainalbe Development of Grassland Agriculture
【期刊论文数据库】: [DBS_Articles_01]
【期刊论文编号】: 101,065,223
【摘要长度】: 2,488
【会议地点】: Changchun(CN)
【会议组织】: Key Laboratory for Vegetation Ecology of the Ministry of Education, Northeast Normal University, Changchun,Jilin 130024, China;Key Laboratory for Vegetation Ecology of the Ministry of Education, Northeast Normal University, Changchun,Jilin 130024, China;Key Laboratory for Vegetation Ecology of the Ministry of Education, Northeast Normal University, Changchun,Jilin 130024, China;Key Laboratory for Vegetation Ecology of the Ministry of Education, Northeast Normal University, Changchun,Jilin 130024, China;;
【会议时间】: 2014
【上篇论文】: 外文会议 - Impacts of Ruminal Acidosis on Animal Health and Performance
【下篇论文】: 外文会议 - CD-ROM based training course Understanding the Fire WeatherIndex (FWI) System now available!

【论文下载】: 免费获取 该期刊&论文全文内容