Studies on chemical constituents in bud of Artemisia scoparia(Ⅱ) INTRASPECFIC AND INTERSPECFIC COMPETITION OF ARTEMISIA SCOPARIA UNDER DIFFERENT SITE CONDITIONS IN THE HILLY REGION OF LOESS PLATEAU Studies on chemical constituents in bud of Artemisia scoparia(Ⅲ) Adaptability of foliar morphological, anatomical, and physiological characteristics of the pioneer species Artemisia scoparia growing in a hilly-gully Loess Region at different slope sites Studies on Chemical Constituents in Buds of Artemisia scoparia