古尔班通古特沙漠南缘典型沙垄藻类的时空分布

 通过研究春、夏 、秋3季古尔班通古特沙漠典型沙垄藻类物种多样性、种类组成和生物量的变化,分析了典型沙垄中藻类的时空分布特征。结果表明:①地貌部位和不同土层对物种多样性指数影响极显著(P<0.01); 在垂直层次中,藻类物种多样性指数由表及里逐渐降低。②在不同地貌部位和季节中,藻类的种类组成亦表现出一定的差异。垄间低地和背风坡球形藻类和丝状藻类丰富,迎风坡以丝状藻类占优势,垄顶藻类的种类和数量都有明显的下降。③地貌部位、垂直层次和季节对藻类生物量的影响均极显著(P<0.01)。藻类在沙漠典型沙垄的分布具有空间异质性,将影响到生物结皮的发育,使其处于不同的发育阶段,而它们在生物结皮中的地位和作用亦不同。

Spatio-Temporal Distribution of Algae Relating to Biological Soil Crusts in the Gurbantunggut Desert,Xinjiang,China

In spring,summer and autumn of 2007,soil samples were colleted,cultured and identified in the different locations of sand dunes in the Gurbantunggut Desert,northern Xinjiang of China.Algae biomass of soil samples was measured.The spatio-temporal distribution of algae was determined by species diversity,species composition and biomass.The results indicated that:(1) Species diversity was significantly affected by locations of sand dunes and soil layers with different depth(P<0.01).Species diversity of algae i...