摘要
在科尔沁沙地封育5年的围栏内选取典型流动、半流动、半固定、固定和丘间低地5种不同样地,并以未封育的流动沙地作为对照,测定了狗尾草生长特征指标及地上、地下生物量。结果表明:随着环境条件的改善,狗尾草的分蘖株数逐渐减少,而围栏内狗尾草叶长、叶片长宽比和最大穗长增大;植株高度排列次序为丘间低地>固定沙地>半固定沙地>半流动沙地>流动沙地>对照,而围栏内植株根长及其与株高比值的大小次序与株高正好相反;不同类型沙地狗尾草地上、地下生物量有所不同,但不同类型沙地狗尾草地上、地下生物量的分配比例在一定范围内变动,生物量主要分配在地上部分,地上生物量与总生物量的比值不小于80%,而地下生物量与总生物量的比值不超过20%。
Taking an unfenced mobile sandy land as the control, this paper studied the growth characteristics and biomass allocation of Setaria viridis on five types of fenced sandy lands, i. e. , mobile sandy land, semi-mobile sandy land, semi-fixed sandy land, fixed sandy land, and interdunal lowland. The results showed that with the improvement of the environment, the ramet number on fenced sandy lands decreased, while the leaf length, leaf length/width ratio, and the longest ear length increased. The plant height was in the order of interdunal lowland 〉 fixed sandy land 〉 semi-fixed sandy land 〉 semi-mobile sandy land 〉 mobile sandy land, but the root length and root length/plant height ratio were in adverse. The aboveground and underground biomass of S. viridis differed with different types of fenced sandy lands, but the allocation patterns were similar. The aboveground biomass occupied more than 80% of the total, while underground biomass was less than 20%.
出处
《生态学杂志》
CAS
CSCD
北大核心
2008年第4期504-508,共5页
Chinese Journal of Ecology
基金
中国科学院寒区旱区环境与工程研究所创新项目(O650444001)
国家科技支撑计划资助项目(2006BAC01A12)
关键词
狗尾草
生长特征
生物量分配
Setaria viridis
growth characteristics
biomass allocation.
