摘要
讨论了沼泽湿地优势种小叶樟 (Calamagrostisangustifolia)和毛果苔草 (Carexlasiocarpa)生物量和生长率变化情况 ,不同生长期各器官中N素含量及储量动态变化 ,以及植物对N素利用和区域养分限制情况 .结果表明 ,两种植物地上生物量生长符合模式p =γ +αt + βt2 ,地下生物量符合曲线p =a0 +b0 t ;受土壤水分、养分、气温和植物本身特点及其对N素选择吸收作用等多种因素影响 ,小叶樟、毛果苔草和漂筏苔草 3种植物不同器官中‘三氮’含量变化较大 ,NO-3 N比NH+4 N含量稳定且NH+4 N/NO-3 N >1;小叶樟、毛果苔草和漂筏苔草 3种沼生植物中N∶P <14 ,表明限制本区植物生长的是N ,而不是P ,而且 6月份限制作用较小 ,8月份限制作用较大 .对土壤中有效态N的含量百分比变化分析得到同样的结论 .
The dynamics of nitrogen content and storage in different organs of Calamagrostis angustifolia and Carex lasiocarpa which are dominant vegetation in swamp wetland were determined,and the utilization rate of nitrogen and its nutrient limitation in the region were analyzed.The results showed that the aboveground and underground biomass might be described by p=γ+αt+βt\+2 and p=a\-0+b\-0t ,respectively.The content of total N,NH + 4 N and NO - 3 N varied widely with different organs because of the effects of soil water,nutrient content, atmospheric temperature,vegetable feature and selective absorption to nitrogen,etc.The content of NO - 3 N in different organs varied less than that of NH\++\-4 N,and NH\++\-4 N/NO\+-\-3 N was <1.The N∶P content less than 14 in two vegetations showed that it was N but not P was the limitation nutrient to the growth of vegetation in this region,moreover,the limitation was less in July than in August.This conclusion was also drawn from the analysis of the NH\++\-4 N and NO\+-\-3 N content in soil.
出处
《应用生态学报》
CAS
CSCD
2000年第6期893-897,共5页
Chinese Journal of Applied Ecology
基金
中国科学院长春地理研究所所长基金资助项目
