摘要
对星星草（Ｐｕｃｃｉｎｃｅｌｌｉａｔｅｎｕｉｆｌｏｒａ）群落的生产结构、现存量季节动态和地上净初级生产力（ＡＮＰＰ）的研究结果表明：同化系统（ＡＳ）和非同化系统（ＵＡＳ）的现存量分别集中分布于地上０～２０ｃｍ和０～３０ｃｍ的范围内，属典型的下繁型草地群落。其ＡＳ．ＵＡＳ和地上总现存量（Ｙ）在空间不同层次（ｘ）的积累规律表现为变型双曲线函数Ｙ＝ａ＋ｂ／ｘ形式。星星草种群及其群落地上生物量增长规律符合Ｌｏｇｉｓｔｉｃ增长模型；其地上现存量季节动态呈二次抛物线方程Ｙ＝ａ＋ｂｘ＋ｃｘ２形式。该群落的ＡＮＰＰ为２００．９８／ｍ２·ａ。
The study concerned an investigation into the seasonal dynamics of preductive structure,standingcrops of plants and above一ground net primary preductivity(ANPP)of a Puccinellia tenuiflora community inthe alkaline meadow distributed in the Northeast.It was shown in the study that the standing crops of the as-similative system(AS)and the unassimilative system(UAS)in the community were concentrated mainlywithin 0～20 cm and 0～30 cm,respectively,from the ground level.This fact indicates that the communi-ty is one of the typical grassland communities which flourish at a low level close to the ground.The changesin the accumulated quantity of AS,UAS and total above一ground standing crops(Y)with respect to theheight from ground level(X)could be represented by a hyperbola function as Y=a+b/X.The pattern ofchanges in the above一ground biomass could be described by the Logistic Growth Model for both the Puc-cinellia population and its community,while the seasonal changes in standing crops一by a parabola equationas Y=a+bX+cX2.The ANPP of the community was determined as 200.9 g per square metres per annum.
出处
《草业学报》
CSCD
1995年第1期36-43,共8页
Acta Prataculturae Sinica
基金
国家自然科学基金
关键词
星星草
群落
生产结构
净初级生产力
P.tenuiflora,community,productive structure,standing crops,net primary productivity
