羊草地上生物量的遥感估产及其不同步的修正

YIELD ESTIMATION AND REVISION OF NO SYNCHRONOUS TO THE ABOVE GROUND BIOMASS OF LEYMUS CHINENSIS WITH REMOTE SENSING METHD

本研究应用 LANDSAT MSS 影像资料对内蒙古呼伦贝尔盟羊草草原的地上生物量进行了预报.文中对地面测产时间与卫星过境时间不同步的问题,从植物种群的生态规律出发,根据试验区定位观测数据,利用 Logistic 方程对产草量数据进行了同步修正.统计分析结果表明,修正后的产草量同植被绿度指数之间的相关关系有明显的提高,相关系数γ=0.906,呈显著的正相关.而未经修正的产草量,相关系数仅为0.630,没能通过α=0.01水平的显著性检验.对呼盟鄂温克旗羊草草原产草量预报的结果亦表明,预报值与实测值达到了较好的吻合.

In this research,we have made a forecasting to the above ground biomass of the Ley- mus chinensis grassland in the Hulunbeiermeng of Inner Mongolian by using the LANDSAT MSS image material.Because the ground yield determination time and the Satellite passing time are not synchronous,based on the ecological principles of plant grouns and the exprimental regions fixed position observing data,the author has made a synchronous revsion to the grass yield data by us- ing Loyistic equation.The statistical analysis shows that he interrelation between revised grass yield ad green index of vegetation has been developed evidently.Therefore the correlation coeffi- cient γ=0.906 presents a remarkable positive correlation.But for the unrevised grass yield,the correlation coefficient is only 0.630,which has not passed the remarkable test of the α=0.01 level.The forecasting result of the Leymus Chinensis grassland's grass yeld in Ewenk county Hu- lunbeiermeng shows that the forecasting value fits the field measuring value fairly good.