Responses of soil extracellular enzyme activities and microbial community properties to interaction between nitrogen addition and increased precipitation in a semi-arid grassland ecosystem
Responses of soil extracellular enzyme activities and microbial community properties to interaction between nitrogen addition and increased precipitation in a semi-arid grassland ecosystem
复制标题
半干旱草原生态系统土壤胞外酶活性和微生物群落特性对氮添加和降水增加相互作用的响应
DOI：
10.1016/j.scitotenv.2019.134691
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发表时间：
2020-02-10
影响因子：
9.8
通讯作者：
Li, Zhuo
中科院分区：
文献类型：
--
作者：
Ma, Wenjun;Li, Jian;Li, Zhuo
大气氮沉降和降水对地下生物地球化学过程都有强烈的影响。土壤胞外酶活性和微生物被认为是生态系统养分循环的关键因子。然而，氮沉降增加与降水之间的相互作用如何影响土壤EEAs和微生物仍然知之甚少。在中国北方草甸草原进行了5年的田间试验，研究了N添加(N0, 0; N1, 5; N2, 10 g N m （2) yr(1)）和增加降水（W0，环境降水；W1，增加15%环境降水；W2，增加30%环境降水）对土壤EEAs、微生物和化学性质的影响。结果表明，除β -1,4-木糖苷酶（β X）外，它们的互作显著影响了所有水解酶的活性。此外，增加降水和添加氮对细菌基因拷贝量(P
Both atmospheric nitrogen (N) deposition and precipitation can strongly impact below-ground biogeochemical processes. Soil extracellular enzymes activities (EEAs) and microorganisms are considered as the key agents in ecosystem nutrient cycling. However, how the interaction between increasing N deposition and precipitation may affect soil EEAs and microbes remain poorly understood. In a 5-year field experiment in a meadow steppe in northern China, we tested the effects of N addition (N0, 0; N1, 5; N2, 10 g N m (2) yr (1)) and increased precipitation (W0, ambient precipitation; W1, increase of 15% ambient precipitation; W2, increase of 30% ambient precipitation) on soil EEAs, microbial and chemical properties. Results showed that their interaction significantly affected all hydrolase activities, except for beta-1,4-xylosidase (beta X). Furthermore, increased precipitation and N addition interactively affected bacterial gene copies (P