摘要
对披碱草（Ｅｌｙｍｕｓｄａｈｕｒｉｃｕｓ）与草原２号杂花苜蓿（Ｍｅｄｉｃａｇｏｖａｒｉａｍａｒｅｉｎ，Ｃｖ，ＣａｏｙｕａｎＮｏ．２）不同混播比例的群落性质，高度生长和地上生物量积累动态及混播后地上生产力进行了对比研究，披碱草、苜蓿的高度生长方式不受不同混播比例的影响，其高度生长曲线分别为Ｈ＝ｔ／（ａ＋ｂｔ＋ｃｔｔ）和Ｈ＝ａ＋ｂｔ＋ｃｔ．披碱草、苜蓿的地上生物量积累方式不受不同混播比例的影响，其增长曲线为Ｗ＝ａｔｂ．不同混播比例生物量积累速率不同．茎叶比、叶面积指数在不同的混播群落中数值不同，苜蓿的叶面积指数大于披碱草．混播有利于高产，不同混播群落地上生物量与天然对照具有显著或极显著的差异，其中披碱草与苜蓿地上植株密度比为３１（播种量２５ｋｇ／ｈｍ２１３．９ｋｇ／ｈｍ２）时产量最高．混播群落粗脂肪、总能量、消化能含量均高于单播群落．综合分析评价，披碱草与苜蓿密度比为３１（３小区），为最优化的群落组合．
The height increased fashion of E.dahuricus and Medicago was not affected by differents proportion of mix sowing,the regression curves equation of height increased of E.dahuricus is h=t(a+bt+ctt) and the curves equations of height increased of Medicago is h=a+bt+ctt (h as height, t as time of growing).The fashion of above ground biomass accumulation of E.dahuricus and Medicago were not affected by mix sowing of differents proportion,the curves equation of biomass accumulation of E.dahuricus and Medicago are W=at b. The rates of increased of biomass and height are differents on mix sowing of differents proportion.Single sowing and mix sowing of different propertion have differents structure of biomass,biomass leaves were distributed in differents space,leaves of E.dahuricus and Medicago were distributed in differents space,on mix sowing,the competitive of light energy can avoid,and advantageous to increasing biomass.The stem/leaves value, LAI are differents on differents district. LAI of Medicago more than LAI of E.dahuricus.There were a marked increased in biomass of community by sowing than natural community and the increased biomass 47%￣161%.The biggest biomass is producted in district of density proportion as 3/1 ( E.daharicus/medicago), (sowing seed weight 25 kg/hm 2∶13.9 kg/hm 2).
出处
《内蒙古大学学报（自然科学版）》
CAS
CSCD
1997年第2期222-228,共7页
Journal of Inner Mongolia University：Natural Science Edition
基金
国家"八五"攻关项目资助
内蒙古教育厅资助
