Responses of soil phosphorus pools accompanied with carbon composition and microorganism changes to phosphorus-input reduction in paddy soils  

作　　者：Jiahui YUAN Lei WANG Hao CHEN Guanglei CHEN Shenqiang WANG Xu ZHAO Yu WANG 

机构地区：[1]State Key Laboratory of Soil and Sustainable Agriculture,Changshu National Agro-Ecosystem Observation and Research Station,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Organic Food Development Center,Nanjing Institute of Environmental Sciences,Ministry of Environmental Protection,Nanjing 210042,China [4]College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China

出　　处：《Pedosphere》2021年第1期83-93,共11页土壤圈（英文版）

基　　金：funded by the National Natural Science Foundation of China (No. 41671304);the National Key Research and Development Program of China (No. 2017YFD0200206)。

摘　　要：In rice-wheat rotation systems, changes in soil phosphorus(P) pools and microorganisms in rice-growing seasons have been studied;however, further investigations are required to test whether these indexes exhibit different responses in wheat-growing seasons. Additionally, such studies need to include potential variations in soil carbon(C) structure and microbial community composition. In this study, a long-term rice-wheat rotation P-input reduction experiment was conducted to observe the variations in soil P pools and C composition in the 7th wheat season and to investigate the responses of soil enzyme activity and microbial communities. Four P fertilization treatments were included in the experiment, i.e., P application for rice season only(PR), for wheat season only(PW), and for both rice and wheat seasons(PR+W) and no P application in either season(Pzero). Compared with PR+W treatment, Pzero treatment significantly decreased(P < 0.05) labile and stable P pools. Different P fertilization regimes altered soil microbial community composition and enzyme activity, whereas C composition did not vary. However, PW treatment resulted in relatively more O-alkyl-C than PR treatment and the highest number of microorganisms. Besides, the higher ratios of fungi/bacteria and Gram-positive bactetia/Gram-negative bactetia were related to labile C pools, particularly O-alkyl-C, as opposed to recalcitrant C. Our results clarified the status of soil P pools, C chemistry, and the response of microorganisms under dry-farming conditions in the P input-reduced rice-wheat rotation system.

关 键 词：13C nuclear magnetic resonance dry farming enzyme activity microbial community composition phospholipid fatty acid phosphorus fractionation wheat season 

分 类 号：S154.3[农业科学—土壤学] S153.6[农业科学—农业基础科学]