Studies on the Effects of N and P on the Competition of Flaveria Bidentis (L.) Kunt and Chenopodium Album (L.) Grew

摘要

In order to clarify the competition characteristics of Flaveria Bidentis, the effects of N and P on the competition of F. Bidentis were studied with C. Album as competitor. A field experiment, including nine fertilizing levels was conducted. N and P decreased Non-photochemical quenching (NPQ) and maximal fluorescence (Fm) of two kinds of plant. P increased significantly the effective quantum yield of photosystemll (Yield), electron transport rate (ETR) and Pn of F. Bidentis, so that dry weight per plant (PDW) were high (except NHPH). But P decreased Yield, ETR of C. Album. Finally, PDW and relative growth rates (RGR) of F. Bidentis in NLPLwere the highest, but these of C. Album were lower. The results showed that optimal N and P fertilizer could enhance the competition of F. Bidentis, especially for P nutrient.