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Responses of soil enzyme activity and microbial community compositions to nitrogen addition in bulk and microaggregate soil in the temperate steppe of Inner Mongolia
Shi Y.; Sheng, L. X.; Wang, Z. Q.; Zhang, X. Y.; He, N. P.; Yu, Q.
Source PublicationEurasian Soil Science
2016
Volume49
Issue10
Pages1149-1160
Keywordsoil microaggregate enzyme activity PLFA long-term N addition temperate steppe organic-matter decomposition fatty-acid profiles n-deposition bacterial-growth terrestrial ecosystems grassland ecosystems carbon sequestration semiarid grassland current knowledge cropping systems
AbstractIn order to explore the responses of soil enzyme activities and microbial community compositions to long-term nitrogen (N) addition in both bulk soil and microaggregate of chestnut soil, we conducted a 7-year urea addition experiment with N treatments at 6 levels (0, 56, 112, 224, 392 and 560 kg N ha(-1) yr(-1)) in a temperate steppe of Inner Mongolia in China. Soil properties and the activities of four enzymes involved in carbon (C), nitrogen (N) and phosphorus (P) cycling were measured in both bulk soil and microaggregate, and phospholipid fatty acids (PLFAs) were measured in bulk soil. The results indicated that: 1) in bulk soil, N addition significantly decreased beta-1,4-glucosidase (BG) and leucine aminopeptidase (LAP) activities at the treatment amounts of 224, 392 and 560 kg N ha(-1) yr(-1), and obviously suppressed beta-1,4-N-acetylglucosaminidase (NAG) activity at the treatment amount of 560 kg N ha(-1) yr(-1). N addition enhanced total PLFAs (totPLFAs) and bacterial PLFAs (bacPLFAs) at the treatment amounts of 392 and 560 kg N ha(-1) yr(-1), respectively, but fungal PLFAs showed no response to N addition. The activities of BG, NAG and LAP were positively correlated with soil pH, but negatively correlated with the concentration of NH (4) (+) -N; 2) in microaggregate (53-250 mu m), the activities of BG, NAG and AP showed no response to increased addition of N, but the significantly decreased LAP activity was observed at the treatment amount of 392 kg N ha(-1) yr(-1). These results suggested that enzyme activities were more sensitive to N addition than PLFA biomarkers in soil, and LAP activity in microaggregate may be a good indicator for evaluating N cycle response to long-term N addition.
Indexed BySCI
Language英语
ISSN1064-2293
DOI10.1134/s1064229316100124
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document TypeSCI/SSCI论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/43195
Collection历年回溯文献
Recommended Citation
GB/T 7714
Shi Y.,Sheng, L. X.,Wang, Z. Q.,et al. Responses of soil enzyme activity and microbial community compositions to nitrogen addition in bulk and microaggregate soil in the temperate steppe of Inner Mongolia. 2016.
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