内蒙古镶黄旗草地蝗虫潜在发生可能性评价

以内蒙古草地蝗虫产卵期、越冬期和孵化期的关键气象影响因子作为草地蝗虫气象适宜度指数构建的主要因子，对内蒙古镶黄旗2010年草地蝗虫潜在发生的气象适宜性进行评价；根据当年7月上中旬在镶黄旗的实地调查资料，选取海拔、坡向、土壤类型、土壤含砂量、植被类型、植被盖度、土地覆被类型7个相对稳定的生境因子，用模糊评判方法和3S（GIS、RS、GPS）技术对该旗草地蝗虫潜在发生的生境适宜性进行评价；最后通过构建气象-生境适宜性综合评价模型，得到该旗2010年草地蝗虫潜在发生可能性（POG）等级，并用2010年实测数据和2001-2010年历史数据对模型模拟的蝗虫发生位置和蝗灾发生面积进行验证.结果表明：用本文所建气象-生境适宜性综合评价模型对镶黄旗POG等级的评价结果是可靠的.该旗草地蝗虫潜在发生的气象适宜性等级非常一致，绝大多数为适宜等级；蝗虫潜在发生源地的空间异质性主要与生境因子有关，在海拔1300～1400 m的平地/东坡/南坡、植被盖度30%～50%的温带丛生禾草草原、土壤含砂量60%～80%的典型栗钙土的生境条件下，草地蝗虫潜在发生的可能性最高.

Biomass models of poplar plantations in arid desert environment of China based on perpendicular vegetation index

Taking the poplar plantations in Karamay City of Xinjiang as a case,and by using the actual poplar plantation biomass data of 48 sampling plots as well as the Landsat TM data,this paper analyzed the correlations between remote sensing information and actual poplar plantation biomass data,aimed to accurately estimate the biomass of poplar plantation ecosystem in arid desert environment of China.The linear and exponential models of poplar plantation aboveground biomass were established on the basis of perpendicular vegetation index(PVI),and applied to compare the normalize difference vegetation index(NDVI) and ratio vegetation index(RVI).There existed significant correlations between the three vegetation indices(PVI,NDVI,and RVI) and poplar plantation aboveground biomass,and the exponential model(y=13.783e0.0257x) based on PVI was the best one(with multiple correlation coefficient of 0.761) for estimating the poplar plantation biomass in arid desert environment.