草原植物种群营养元素生殖分配规律研究(Ⅰ)

A Study on the Reproductive Allocation of Six Nutrient Elements in Steppe Plant Populations (Ⅰ)

通过对典型草原２０个植物种群结实期的Ｃ、Ｎ、Ｐ、Ｋ、Ｃａ、Ｍｇ６种元素在植物体不同部位配置的研究，初步认为Ｃ、Ｋ、Ｍｇ在不同种群的生殖分配规律基本一致，在生殖器官中所占比例约为２５％～３０％；Ｎ、Ｐ在生殖器官中所占比例较大，约为３０％～４０％；Ｃａ在生殖器官中的比例较低，仅占２０％左右，而单子叶植物种群中的根部含量多，占５０％左右，双子叶植物种群中的叶中含量多，占４０％左右．另外，有几种植物较为特殊，狼毒、鹤虱的果实中Ｐ的含量较低，不到２０％；狼毒、达乌里芯芭的果实中Ｃａ的含量低，大约１０％；狼毒、酸膜叶蓼的果实中Ｍｇ的含量低，大约１０％．

The reproductive allocation of C,N,P,K,Ca,Mg in different plant parts and different plant populations was studied.The results show that the reproductive allocation of C,K,Mg is identical,the contents of reproductive organ are about 25%￣30%.The contents of N,P are highest in reproductive organ,and they are 30%￣40%.The contents of Ca are low in reproductive organ.They are about 20%.But they are highest in root of monocotyledon (about 50%) and leaf of dicotyledon (about 40%).Moreover some populations are special.They are Stellea chamaejasme,Lappula echinata,Cymbaria dahurica,Polygonum lapathifolium.