作　　者： ; ; ; ;

机构地区： 包头师范学院

出　　处： 《生态学报》 2003年第5期908-913,共6页

摘　　要： 通过对播种、移植于大小不同花盆的 1年龄和多年龄冷蒿进行刈割实验 ,探讨冷蒿在不同刈割强度下可溶性碳水化合物含量和库的变化。结果表明 ,在不同的刈割强度下 ,冷蒿可溶性碳水化合物含量表现为 :刈割 1 /4和刈割 2 /4比不进行刈割和刈割 3 /4高 ,可溶性碳水化合物库表现为 :刈割 1 /4>对照 >刈割 2 /4>刈割 3 /4;刈割后在不同的资源与空间 ,冷蒿体内可溶性碳水化合物含量和可溶性碳水化合物库均表现为 :大盆 >小盆 >移栽盆 ;在不同的刈割强度下生物量发生明显的变化 ,刈割 1 /4冷蒿生物量比对照增加 ,出现超补偿生长 ,刈割 3 /4生物量降低 ,出现欠补偿生长。说明适度的干扰有利于冷蒿碳水化合物、生物量的积累 ;可利用资源、空间越多 ,可溶性碳水化合物含量越高。可溶性碳水化合物库的变化趋势与再生生长的趋势一致 。 A defoliation study to imitate grazing was undertaken to research the variance of water-soluble carbohydrate (WSC) of Artemisia frigida and WSC pool under different defoliation intensities. A. frigida were arranged in different flowerpots. Material Ⅰ(M 1) was sown into big flowerpot (d=40cm,h=25cm), material Ⅱ (M 2) was that M 1 which was removed to small flowerpot (d=20cm,h=13cm), material Ⅲ was removed into small flowerpot from the Inner Mongolia Grassland Ecosystem Research Station, The Chinese Academia Sinica. On July 7th,2000, plants underwent varying defoliation: 1. no defoliation (CK); 2.defoliate each tiller 1/4, (D 1/4); 3.defoliate each tiller 2/4, (D 2/4); 4.defoliate each tiller 3/4, (D 3/4). Sep. 30,2000, plants were harvested,stoved and dry weight were measured, WSC were analysis. The results showed: WSC of A. frigida of D 1/4 and D 2/4 were higher than that of CK and D 3/4. As to A.frigida status WSC of D 1/4 were higher than D 2/4. But to perennial A. frigida. WSC of D 2/4 were higher than that D 1/4. In all treat the highest WSC is 17^76mg/g, which was D 1/4 of M-1 in big flowerpot where there was more water and nutrition, the lowest was 8.50mg/g, which was CK of M-2 in small flowerpot.It indicated defoliation could increase WSC, the more source and space plants could use, the better plants regrowth after defoliation would be.The perennial A. frigida had stronger defoliation-resistance than status. Biomass of A. frigida increased after defoliation 1/4, and occurred over-compensatory growth, but decreased after defoliation 3/4, and occurred under-compensatory growth. In good resource and space condition (in big flowerpot) over-compensatory growth occurred after defoliation 2/4, but in bad resource and space condition (in small flowerpot) under-compensatory growth occurred. So, A. frigida occurred over-compensatory growth when they were in good condition and moderate defoliation. After defoliation, the WSC pools (WSC contents × biomass) of defoliati

关 键 词： 刈割强度 冷蒿 可溶性碳水化合物 再生生长 菊科 冷篙草原群落 再生生长 放牧率

领　　域： [农业科学] [农业科学] [农业科学]