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Two-year-old seedlings of Pinus species typical in North China (Pinus thunbergii, Pinus tabuliformis and Pinus koraiensis) were selected as the research object. The water extracted from the litter of P. thunbergii, P. tabuliformis and P. koraiensis were used to test the changes of photosynthetic pigment Chl. a, Chl. b and allelochemicals. The results were as follows: aqueous extract of P. thunbergii needle litter had significantly low inhibition on P. thunbergii while strongly inhibited P. tabuliformis and P. koraiensis. It also showed a markedly low inhibition on P. thunbergii, a moderate inhibition on P. tabuliformis, and a greatly strong inhibition on P. koraiensis. Obviously strong inhibition on P. thunbergii, P. tabuliformis and P. koraiensis were observed as well. Our study showed that pine needle water leaching solutions, such as P. tabuliformis, P. thunbergii and P. koraiensis, significantly inhibit their Chl. a and Chl. b, and will be a norm, which provides a new explanation for the decline in the coniferous forests of northern China.

STUDY ON ALLELOPATHY OF THREE SPECIES OF PINUS IN NORTH CHINA