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Effects of different durations of rice-duck farming on the structure of algal communities in water
Received:February 24, 2021  
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KeyWord:rice-duck farming;algae;high-throughput sequencing;diversity;composition of communities
Author NameAffiliationE-mail
WANG Xiaoying Jiangsu Modern Crop Production Collaborative Innovation Center, Institute of Applied Ecology, Nanjing Agricultural University, Nanjing 210095, China  
FENG Jinxia Jiangsu Modern Crop Production Collaborative Innovation Center, Institute of Applied Ecology, Nanjing Agricultural University, Nanjing 210095, China  
WEI Shengbao Jiangsu Modern Crop Production Collaborative Innovation Center, Institute of Applied Ecology, Nanjing Agricultural University, Nanjing 210095, China  
CHEN Changqing Jiangsu Modern Crop Production Collaborative Innovation Center, Institute of Applied Ecology, Nanjing Agricultural University, Nanjing 210095, China 1996001@njau.edu.cn 
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Abstract:
      This study aimed at exploring how different scales(0.067, 0.200 hm2, and 0.333 hm2) and duration(4 a and 20 a) of rice-duck farming could affect the differences in the composition and diversity of algal communities using high-throughput sequencing and other methods to analyze algal diversity and community structure in the water. The results showed that the algal abundance index of water in riceduck farming fields was higher than that in non-rice-duck farming fields. Moreover, the Ace abundance index of water bodies in long-term rice-duck farming fields was higher than that in short-term farming fields, and the number of species also increased. In non-rice-duck farming fields and rice-duck farming fields of different scales and duration, the dominant algal species were Euglenophyta, Chlorophyta, and Cyanophyta. The abundances of Chlorophyta and Cyanophyta in rice-duck farming fields were higher than those of traditional farming. The scale of rice-duck farming affected the abundance of cyanobacteria; the larger the scale, the lower the abundance of Cyanophyta. The algal diversity index of the rice-duck farming field was higher than that of the non-rice-duck farming field, and the algal community structure of the water was considerably different. The water algal community structure of the rice-duck farming system showed certain similarities. Redundancy analysis showed that for the late stage of rice-duck farming, dissolved oxygen was an important environmental factor that affects the structure of the algal community in traditional farming; the environmental factors that significantly affected the algal community structure in rice-duck farming were soluble potassium and pH. Research shows that the long-term rice-duck farming system increases algal diversity in water and changes the composition of the algal community, thereby affecting the ecological environment of the farmland water.