Effects of long-term nitrogen & phosphorus fertilization on soil microbial, bacterial and fungi respiration and their temperature sensitivity on the Qinghai-Tibet Plateau

	Effects of long-term nitrogen & phosphorus fertilization on soil microbial, bacterial and fungi respiration and their temperature sensitivity on the Qinghai-Tibet Plateau
	Chen, KL; Zhou, HK; Wu, Y; Zhao, ZW; Li, YZ; Qiao, LL; Liu, GB; Xue, S
刊名	PEERJ
	2022
卷号	10
英文摘要	Background. The microbial decomposition of soil organic carbon (SOC) is a major source of carbon loss, especially in ecologically fragile regions (e.g., the Tibetan Plateau), which are also affected by global warming and anthropogenic activities (e.g., fertilization). The inherent differences between bacteria and fungi indicate that they are likely to play distinct roles in the above processes. However, there still have been no reports on that, which is restricting our knowledge about the mechanisms underlying SOC decomposition. Methods. A long-term nitrogen (N) and phosphorus (P) addition field experiment was conducted to assess their effects on soil microbial, fungal, and bacterial respiration (RM, RF, and RB, respectively) and temperature sensitivity (Q10; at 15 degrees C, 25 degrees C, and 35 degrees C) using cycloheximide and streptomycin to inhibit the growth of fungi and bacteria. Results. We found that N suppressed RM and RF at all temperatures, but RB was only suppressed at 15 degrees C, regardless of the addition of P. The addition of N significantly decreased the ratio of RF/RM at 35 degrees C, and the combined NP treatment increased the Q10 of RB but not that of RF. Results of the redundancy analysis showed that variations in soil respiration were linked with NO3--N formation, while the variations in Q10 were linked with SOC complexity. Long-term N addition suppressed RM by the formation of NO3--N, and this was mediated by fungi rather than bacteria. The contribution of fungi toward SOC decomposition was weakened by N addition and increasing temperatures. Combined NP addition increased the Q10 of RB due to increased SOC complexity. The present study emphasizes the importance of fungi and the soil environment in SOC decomposition. It also highlights that the role of bacteria and SOC quality will be important in the future due to global warming and increasing N deposition.
内容类型	期刊论文
源URL	[http://210.75.249.4/handle/363003/61284]
专题	西北高原生物研究所_中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Chen, KL,Zhou, HK,Wu, Y,et al. Effects of long-term nitrogen & phosphorus fertilization on soil microbial, bacterial and fungi respiration and their temperature sensitivity on the Qinghai-Tibet Plateau[J]. PEERJ,2022,10.
APA	Chen, KL.,Zhou, HK.,Wu, Y.,Zhao, ZW.,Li, YZ.,...&Xue, S.(2022).Effects of long-term nitrogen & phosphorus fertilization on soil microbial, bacterial and fungi respiration and their temperature sensitivity on the Qinghai-Tibet Plateau.PEERJ,10.
MLA	Chen, KL,et al."Effects of long-term nitrogen & phosphorus fertilization on soil microbial, bacterial and fungi respiration and their temperature sensitivity on the Qinghai-Tibet Plateau".PEERJ 10(2022).