Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2024, Vol. 40 ›› Issue (18): 58-65.doi: 10.11924/j.issn.1000-6850.casb2023-0592

Previous Articles     Next Articles

Effects of Rice-crab Coculture on Soil Physical and Chemical Properties and Soil Enzyme Activities

CHEN Youming1,2,3(), GUO Yanru4, MA Xingkong3, TIAN Jian3, DONG Yuanhua1,2()   

  1. 1 Key Laboratory of Soil & Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008
    2 University of Chinese Academy of Sciences, Beijing 100049
    3 Freshwater Fisheries Research Institute of Jiangsu Province, Nanjing 210017
    4 Urban Administrative Bureau of Yantai, Yantai, Shandong 264001
  • Received:2023-08-10 Revised:2023-12-18 Online:2024-06-25 Published:2024-06-18

Abstract:

To explore the effects of rice-crab coculture on soil physical and chemical properties and soil enzyme activities, the differences of seven soil physical and chemical indexes and four soil enzyme activities between rice-crab coculture and rice monoculture were studied by using the cement pond simulating paddy field environment. The results showed that there were significant differences in soil bulk density, soil water content and total reducing substances between rice-crab coculture and rice monoculture (P<0.05). The total organic carbon of the rice-crab group was slightly higher than that of rice filed group, but the total nitrogen was slightly lower than that of rice field group. There was a significant difference in Eh between the rice-crab group and the rice monoculture group with a difference of 20.95%. The mechanical composition of soil particle size in rice-crab group and rice field group was silt>clay >coarse and fine sand, and the proportion of silt was more than 80%, and there was a significant difference between the two groups (P<0.05). With the increase of soil depth, the activities of four enzymes in rice filed group decreased significantly. The activities of urease, cellulase and sucrase in the rice-crab group showed the same trends as those in the rice field group, but the acid phosphatase did not change. It could be seen that the introduction of crabs into the integrated rice-crab system reduced the soil bulk density, increased the soil water content, and improved the soil quality. Soil enzyme activities were stronger in the 10-15 cm bottom soil where rice roots were more distributed, which promoted the efficient utilization of carbon and nitrogen by rice in the integrated rice-crab system. Therefore, the integrated rice-crab system is beneficial to both rice growth and crab culture, and can be used as an ecological planting and breeding model in Jiangsu Province.

Key words: rice-crab coculture, soil bulk density, soil water content, total reducing substances, soil particle diameter, soil enzyme activity