Welcome to Chinese Journal of Ecology! Today is Share:

cje ›› 2012, Vol. 31 ›› Issue (11): 2810-2816.

• Articles • Previous Articles     Next Articles

Effects of applying phosphorus and fungicide on the growth and physiological characteristics of Flaveria bidentis.

CHEN Dong-qing, ZHANG Rui, HUANGFU Chao-he**, JIANG Na, TU Chen-yang, YANG Dian-lin   

  1. (AgroEnvironmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China)
  • Online:2012-11-10 Published:2012-11-10

Abstract: A pot experiment was conducted to investigate the roles of soil fungi on the invasion of Flaveria bidentis and to reveal the soil microbial mechanisms involved during this invasion. In the experiment, five levels of KH2PO4 (50 mg·kg-1 of CaSO4, P0; control, no P addition, P1; 20 mg·kg-1 of P, P2; 40 mg·kg-1 of P, P3; and 80 mg·kg-1 of P, P4) were applied, combining with applying fungicide benonyl to suppress soil fungi, aimed to understand the effects of applying P and benonyl on the invasion of F. bidentis. Applying fungicide had significant effects in decreasing the infection rate of AM fungi on F. bidentis, inhibiting the plant photosynthesis, and reducing the plant biomass, soluble sugar content, and protective enzymes (SOD, POD, and CAT) activities, while applying higher levels of P (P3 and P4) under the application of benonyl increased the plant total P content, but had minor effects on  plant total N, soluble protein, and chlorophyll contents. The nutritional status of F. bidentis and the activity of AM fungi on F. bidentis varied with P addition levels. In treatments P0, P1, and P2, the contribution rate of soil fungi to the N and P uptake by F. bidentis was positive, but the opposite result was obtained in treatments P3 and P4. It was suggested that there was a significant interaction between soil fungi and P application levels, and the growth of F. bidentis could be promoted by soil fungi, especially by AM fungi, combining with appropriate P fertilization.

Key words: MODIS, fraction of absorbed photosynthetically active radiation, plant functional type, temporal and spatial variation, filtering of SavitzkyGolay.