›› 2016, Vol. 28 ›› Issue (9): 1588-1594.DOI: 10.3969/j.issn.1004-1524.2016.09.19

• Environmental Science • Previous Articles     Next Articles

Response of soil enzymes activities and microorganism in rhizosphere of watermelon to wheat as companion crop

XU Wei-hui1, 2, WU Feng-zhi2, *   

  1. 1. Department of Life Science and Agroforestry, Qiqihar University, Qiqihar 161006, China;
    2. Department of Horticulture, Northeast Agricultural University, Harbin 150030, China
  • Received:2016-01-06 Online:2016-09-15 Published:2016-11-23

Abstract: Soil sickness is an important factor which limits production of watermelon. It has also been noted that using the biodiversity of the ground could reduce soil sickness. To explore the response of soil enzymes activities and microorganism in the rhizosphere of watermelon to wheat as companion crop, pot experiments were conducted to investigate the response of soil enzymes activities, microbial community structure and microbial biomass in the rhizosphere of watermelon to wheat as companion crop. The four treatments were D123 wheat/watermelon companion system (D123), D125 wheat/watermelon companion system (D125), watermelon monoculture (CK) and no plant (CW). Results showed that total microbial and actinomyce population in the rhizosphere of watermelon in the D123 wheat/watermelon system were increased by 45.21% and 130.20%, respectively, and ratio of actinomyce was increased by 7.6% in the D123 wheat/watermelon companion system compared with watermelon monoculture. Compared with watermelon monoculture, bacteria population was increased by 40.89% and ratio of bacteria was increased by 10.81% in the rhizosphere of watermelon in the D125 wheat/watermelon companion system. Also, the microbial biomass carbon (MBC), microbial biomass nitrogen (MBN) and microbial biomass phosphorus (MBP) in the wheat/watermelon companion systems were significantly higher than those in the watermelon monoculture system. The ratio of fungus and the value of MBC/MBN were decreased, and polyphenol oxidase and saccharase activities in the rhizosphere of watermelon were increased in the wheat/watermelon companion systems compared with watermelon monoculture. The results suggested that watermelon rhizosphere had a positive response to wheat as a companion crop.

Key words: soil sickness, wheat/watermelon companion system, rhizosphere, microbial biomass, microbial community, soil enzymes

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