Fertilizer could increase leaf length and leaf area , but the difference of the effect among different fertilizer levels was not significant . 4 . the biomass was single - humped curve 施肥对芨芨草叶片长度和叶面积存在显著影响，各施肥处理对叶片长度和叶面积均有不同幅度增加，但各施肥处理间差异不甚明显。
In the paper , the ecophysiological characteristics of achnatherum splendens , the effects of water and fertilizer on it and a comparative research to other grass were studied , which provided scientific basis on utilization and exploitation of achna therum splendens 本文研究了在黄土高原大面积生长的优良禾本科牧草?芨芨草的生理生态特性、水肥因子对它的影响以及同其它两种牧草(本氏针茅和厚穗冰草)间的比较，为芨芨草的开发利用提供科学依据。
Compared to stipa bungeana grassland and fallow ground , the volume weight was smaller , total porosity and capillary porosity were higher , but non - capillary porosity was lower . 2 . achnatherum splendens height increased slow in the initial stages , fast from june to august and slow again after that 芨芨草草地土壤容重较本氏针茅草地和裸地小，各层的总孔隙度和毛管孔隙度明显高于本氏针茅草地和裸地，但非毛管孔隙度较本氏针茅草地和裸地低。
Fertilizer influenced trivially on leaf water content , while intensified markedly on the water saturation deficit . 6 . due to the environmental influence , the daily variation of photosynthesis rate of achnatherum splendens leaf in different months was different , which was expressed as a two - humped curve in june and july and a single - humped curve in august and september 6 、芨芨草叶片光合速率日进程受环境影响，在不同时期差异较大， 6月、 7月呈双峰曲线， 8月和9月，光合速率则呈单峰曲线；芨芨草蒸腾速率和气孔导度日进程在整个生育期内基本上呈单峰曲线。
And the daily change of transpiration rate and stomatal conductance were single - humped curve . correlation analysis showed that in different months the decisive environmental factor that influenced photosynthesis rate , transpiration rate and stomatal conductance was different , but they had positively correlativity each other 回归分析和相关分析表明，不同时期对芨芨草叶片光合速率、蒸腾速率和气孔导度起决定性作用的环境因子不同，而在整个生育期它们三者之间都存在着极显著的正相关关系。
