Browsing by Author "Kuzyakov, Yakov"
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Item Effect of long-term fertilisation on enzyme activities and microbial community composition in the rice rhizosphere(Taylor & Francis Group - Informa UK Limited, 2022-01-06) Li, Weitao; Kuzyakov, Yakov; Zheng, Yulong; Liu, Ming; Wu, Meng; Dong, Yuanha; Li, ZhongpeiMineral fertilisers differ in changing soil properties, and revealing how the rhizosphere and non-rhizosphere respond could provide a robust assessment of fertiliser regimes. Rhizosphere and non-rhizosphere soils were sampled from five fertilisation treatments in a long-term (24 year) experiment. Enzyme activities and total phospholipid fatty acids (PLFA) content in the rhizosphere soil were 85.8% and 51.3% higher than in the non-rhizosphere soil, respectively. Fertilisation increased enzyme activities, especially the N-cycling enzyme β-1,4-N-acetylglucosaminidase in NP fertilised soil (1.5 and 2.5 times for rhizosphere and non rhizosphere soil, respectively). The PLFA composition indicated that fungi cominated in the rhizosphere fertilised with P, whereas bacteria were more common in the non-rhizosphere soil. The PLFA contents and enzyme activities in the rhizosphere of P-fertilised plants were lower than those in the non-rhizosphere soil because P availability was lower in the rhizosphere. The redundancy analysis showed that the microbial community in the rhizosphere soil was different from that of the non-rhizosphere soil, mainly because there were differences in the 15:1ω6c and 16:0. Long-term (24 year) fertilisation strongly increased nutrient contents, and microbial biomass and activity in paddy soil. It is advisable to apply P fertiliser in the root zone to increase fertiliser use efficiency.Item Rice paddy soils are a quantitatively important carbon store according to a global synthesis(Springer Nature, 2021-08-06) Liu, Yalong; Ge, Tida; van Groenigen, Kees Jan; Yang, Yuanhe; Wang, Ping; Cheng, Kun; Zhu, Zhenke; Wang, Jingkuan; Guggenberger, Georg; Sardans, Jordi; Penuelas, Josep; Wu, Jinshui; Kuzyakov, YakovRice paddies account for ~9% or the world’s cropland area and are characterized by environmental conditions promoting soil organic carbon storage, methane emissions and to a lesser extent nitrous oxide emissions. Here, we synthesize data from 612 sites across 51 countries to estimate global carbon stocks in paddy soils and determine the main factors affecting paddy soil carbon storage. Paddy soils (0–100 cm) contain 18 Pg carbon worldwide. Paddy soil carbon stocks decrease with increasing mean annual temperature and soil pH, whereas mean annual precipitation and clay content had minor impacts. Meta-analysis shows that paddy soil carbon stocks can be increased through several management practices. However, greenhouse gas mitigation through paddy soil carbon storage is generally outweighed by increases in methane and nitrous oxide emissions. Our results emphasize the key role of paddies in the global carbon cycle, and the importance of paddy management in minimizing anthropogenic greenhouse gas emissions.