摘要
研究了长白山高山带雪斑牛皮杜鹃（Rhododendron aureum）群落的生产力特征及其同微生境条件的关系,以阐明寒冷条件下碳蓄积特征。结合土壤温度连续观测,测定了雪斑不同部位的群落生产力以及土壤养分特征。牛皮杜鹃群落的积雪时间超过240d,土壤温度在-1~0℃的时间长达150d,是非雪斑地段的3倍以上。尽管雪斑的热量条件不如周围优越,但是群落生产力相对高出很多。雪斑中心的牛皮杜鹃群落近3 a的现存量（1707g/m2）是边缘无雪地段（288g/m2）的6倍。雪斑中心的土壤养分水平比周围高,雪斑同时为植物提供了极端低温条件下的避难场所。苔原生态系统生产力的维持依赖于寒冷季节的相对温暖环境,而不是生长季节的热量水平。
In order to understand the carbon accumulation pattern under cold conditions,the primary productivity in Rhododendron aureum community in snowpacks of alpine tundra and its relationship with site characteristics in Changbai Mountain,northeast China,were investigated.Community productivity and soil nutrients were analyzed along with continuous measurements of soil temperature in different parts of the snowpacks.The snow cover in in Rhododendron aureum community lasted for over 240 days,with soil temperatures in the range-1-0℃ of 150 days,which was three times of the snow-free.Despite the poor thermal conditions,biomass of the past three years was 1707g/m2,which was six times of that in the snow-free area at only 288g/m2.The productivity showed a positive correlation with monthly average temperature of the coldest season or coldness index.Soil nitrogen content under snow patch was significantly higher than in snow-free area.In addition,it was a harbor for plants to avoid injury by extreme coldness.It is concluded that the productivity in alpine tundra ecosystem depends on coldness in winter rather than on thermal conditions during growing season.
出处
《生态学报》
CAS
CSCD
北大核心
2009年第8期4035-4044,共10页
Acta Ecologica Sinica
基金
国家自然科学基金资助项目(40671098)
关键词
高山苔原
长白山
土壤温度
养分
alpine tundra
Changbai Mountain
soil temperature
nutrient
