【摘要】 采用分层取样方法对不同生长年限(10a、15a、3a、1a)紫花苜蓿0~150cm生物量空间分布特征进行的研究结果表明:不同生长年限紫花苜蓿地上生物量变化范围为1171.67~4085.33g/m2,其顺序为3a>10a>1a>15a;地下生物量变化范围为648.62~2670.09g/m2,其顺序为10a>15a>3a>1a;地下生物量与地上生物量的比值变化范围为0.23~2.12,其顺序为15a>10a>1a>3a。不同生长年限紫花苜蓿地下生物量均主要分布0~30cm土层,1a占总地下生物量76.6%,3a占45.6%,10a占55.82%,15a占57.22%;而相同土层不同生长年限紫花苜蓿在0~30cm土层均以15a紫花苜蓿地下生物量最高,30~100cm土层则以10a紫花苜蓿最高。更多还原

【Abstract】 The distribution characteristics of alfalfa roots in the depth of 0to 150 cm which grew for different years were studied.The results showed that 1)the aboveground biomass of alfalfa with different growth years was from 1171.67 to 4085.33g/m2,wich was decreased in order of 3a>10a>1a>15a;the belowground biomass of alfalfa with different plantations was from 648.62~2670.09g/m2,which was decreased in order of 10a>15a>3a>1a;and below/above ground biomass was from 0.23~2.12,which followed the following sequence:15a>10a>1a>3a.2)the below ground biomass of alfalfa with different plantations were mainly distributed in the 0to 30 cm soil layer,the biomass in a year accounted for 76.6%,biomass in 3years accounted for 45.6%,biomass in 10 years accounted for 55.82%,biomass in 15 years accounted for 57.22%.The belowground biomasses of alfalfa with different growth years in the same soil layer were different.In the 0to 30 cm soil layer,the belowground biomass in 15 years was the highest;in the 30~100cm soil layer,the belowground biomass in 10 years was the highest.更多还原