知识与财富的链接
光能利用率（LUE）是植被光合作用的重要概念,也是研究草地生态系统不同尺度的总第一性生 产力（GPP）、净第一性生产力（NPP）估算模型的重要参数之一。该文通过地面遥感测量、暗箱—气相色 谱法（DC-GC）和涡度相关技术（EC）的方法,在2011年8月初至9月初,获取呼伦贝尔地区以贝加尔 针茅为主要优势种的草甸草原光能利用率,并动态分析光能利用率的日变化和季节变化。研究表明,光能 利用率日变化呈先降低后增加的单峰趋势,即在早晚出现较高值,中午出现较低值;光能利用率的季节变 化总体呈下降趋势。日变化研究中光合有效辐射PAR和温度都与光能利用率呈显著负相关;季节变化研究 中,温度与光能利用率呈弱正相关,叶面积指数与光能利用率呈显著正相关。
Light use efficiency（LUE） is one of the most important vegetation parameters and is critical for estima- ting and modeling of Gross Primary Productivity（GPP） and Net Primary Productivity（NPP） of grassland ecosys- tems at different scales. Using the methods of ground-based remote sensing, the box method-gas chromatography and eddy covariance technique（EC）, this papergot light use efficiency of stipa baicalensis meadow steppe in early August to early September of 2011 in Hulunber, and analyzed the dynamic of diurnal and seasonal variation of light use efficiency. The results indicated that the daily change of light use efficiency decreased firstly and then in- creased, while the seasonal dynamics showed a decrease trend. The hourly photosynthetic active radiation（PAR） and temperature were both significantly negatively correlated with light use efficiency, daily temperature was weakly positively correlated with light use efficiency and leaf area index was significantly positive correlated light use effi- cien from early August to early September.
