六盘山森林生物量与生态水文作用的研究

六盘山木本植物有37科、67属、600余种,组成温带落叶阔叶林、小片针叶纯林和针阔混交林。森林及灌木、草本的叶、枝、杆、根、枯枝落叶层对天然降水在不同程度上起着缓减、吸收、截留等生态水文作用。六盘山林区分布的几种根生群落,生物量的差异显著,其中在海拔低、土壤水热条件好、空气湿度大的地方生物量较高。在六盘山林区不同的植物群落类型下吸水量的差异也十分明显,最大为华山松,其他依次为辽东栎、白桦林、灌木、草本。六盘山林区自然条件恶劣,森林所产生的间接效益往往超过其本身的价值,保持水土、涵养水源的效益很显著。

Study on Forest Biomass of Liupan Mountain and Its Ecohydroiogy

Liupan mountain is the origin of three Yellow river tributaries,the Jinghe,Qingshui and Hulu rivers.For the function of conserving headwater,soil and adjusting the climate,forest plays a huge role in the production,construction,and economic development of the three river valleys located at the juncture of Shaanxi,Gansu provinces,Ningxia autonomous region.It was therefore very important for us to study the headwater conservation function of torest.The Liupan monutain natural conservation area provides the headwater conservation function of forest in the forest ecology system.It is a moderate zone of needle,leaf-faller and wide-leaf forests of the northwestern Loess Plateau in China,It is also a well-conservation and natural secondary forest area in the Loess Plateau.Conservation of the forest ecotype plays an important role in scientific research,education and production.The junture area between the Mengxin wil-dness and the Qinling mountain area,especialy,has characteristics of mixed plant species is a rich biological resource,very important to the history of the remaining Loess area.