摘要
羊草草地土壤 植物间营养元素Fe的动态研究结果表明 ,土壤中全铁和有效铁含量均较低 ,羊草中Fe含量比较丰富 .在生长季各时期 ,全铁和有效铁含量在土壤剖面分布上从上向下呈下降趋势 ,有效铁与有机质含量呈显著正相关 ,而与 pH值呈显著负相关 .全铁各月平均含量变化在生长季呈“V”型曲线 ,7月含量最低 ;有效铁平均含量从 5～ 8月与全铁相似 ,8月后则逐渐减少 .羊草各器官及枯落物Fe含量有很大变化 ,总的趋势是根 >根茎 >叶 >枯落物 >茎 ;羊草叶、茎的Fe含量在生长季中为波动型下降曲线 ,根茎、根及枯落物的Fe含量在生长季中为“V”型曲线 .A层土壤富集有效铁的能力稍强 .土壤中Fe活性平均为 0 6 4 0 % ,从 5月至 8月逐渐升高 ,8月后逐渐下降 ,10月份最低 .地下部的Fe向地上部的转移强度为 5～ 7月下降 ,8月升高 ,随后又下降 .地上部Fe向枯落物的转移强度平均为 10 5 0 % 。
The study showed that in the soil-plant ecosystem of the Songnen Plain Leymus chinensis grassland,the contents of total and available iron in soil were relatively low,while Leymus chinensis was abundant in iron.The concentrations of soil total and available iron decreased with soil depth.Soil available iron positively correlated with soil organic matter,while negatively correlated with soil pH.The dynamics of soil total iron showed a “V' curve during the growth season,with the lowest in July,and that of soil available iron was similar to soil total iron from May to August,and gradually decreased after August.The iron concentration in Leymus chinensis changed dramatically with the trend of root>rhizome>leaf> litter >stem.The iron concentrations in leaf and stem had a fluctuant decrease,while those in root,rhizome and litter were fluctuated in “V' curve.Soil A layer enriched in a little more available iron.The iron activation with an average of 0.64% increased from May to August,and decreased after August,with the lowest in October.The shift ratio from underground to aboveground part of Leymus chinensis dropped during May-July,went up in August,and then dropped again.The average shift ratio from aboveground part to litter was 105.0%,which negatively correlated with that from underground to aboveground part.
出处
《应用生态学报》
CAS
CSCD
2004年第12期2250-2254,共5页
Chinese Journal of Applied Ecology
基金
国家自然科学基金资助项目 ( 3 0 170 668和 3 0 3 710 2 0 )
关键词
羊草草地
土壤
全铁
有效铁
Leymus chinensis grassland, Soil, Total iron, Available iron.
