松嫩草地2种胡枝子地上生物量动态及其种间比较  

Above ground biomass dynamics and comparative study of two Lespedeza species on Songnen grassland

作　　者：张宝田[1] 穆春生[1] 金成吉 张福田 

机构地区：[1]东北师范大学草地研究所吉林省生态恢复与生态系统管理重点实验室,吉林长春130024 [2]吉林省延边朝鲜族自治州草原管理站,吉林延吉133001 [3]吉林省长岭县种马场,吉林长岭131511

出　　处：《草业学报》2006年第3期36-41,共6页Acta Prataculturae Sinica

基　　金：吉林省自然科学基金(20030554)资助

摘　　要：对松嫩草地兴安胡枝子与细叶胡枝子地上生物量动态及种间进行的比较研究结果表明,在整个生长季内,2种胡枝子地上总生物量与茎、叶生物量的动态变化与季节气候变化相适应,呈幂函数增长的“S”型曲线形式;花果生物量则呈逐渐增加的直线形式。兴安胡枝子地上总生物量与茎、叶、花果生物量明显高于细叶胡枝子,其最大值分别是细叶胡枝子的1.78,1.31,1.59和3.62倍。在整个生长季,2种胡枝子叶的比重逐渐下降,茎比重逐渐上升,叶比重的急速下降与其生殖生长的开始相关。2种胡枝子RGR双峰曲线的动态变化是与在整个生长发育阶段的外界环境因子的变化紧密相关的。由兴安胡枝子的分枝数量明显大于细叶胡枝子得出,在建立人工草地时,兴安胡枝子应比细叶胡枝子合理稀植。Research on above ground biomass dynamics of Lespedeza daurica and L. hedysaroides on Songnen grassland showed that： the total aboveground biomass and the biomass in stems and leaves varied with the season over the whole growing period. They accumulated exponentially while the biomass of flowers and legume increased linearly. The total above ground biomass of L. daurica was 1.78 times that of L. hedysaroides and the stems, leaves, flowers and pods were 1.31, 1.59, and 2.62 times that of L. hedysaroides respectively. The leaf ratios of both species declined in biomass while the stem ratios rose gradually over the full growing season. The stem and leaf ratio change is important for the start of reproductive growth. Both RGR curves with two peaks correlated closely with the environmental factors outside the development phases. The spread of L. daurica was greater than that of L. hedysaroides. So L. daurica does not need to be planted as closely as L. hed ysaroides.

关 键 词：松嫩草地 兴安胡枝子 细叶胡枝子 地上生物量 种间比较 

分 类 号：S541.5[农业科学—作物学]