摘要
以黑河下游柽柳(Tamarixramosissima)种群为研究对象,通过野外观测,建立柽柳地上生物量与简便易测因子间的关系;利用研究区的高分辨率影像(QuickBird)进行决策树分类,提取出柽柳易测因子的空间分布,估算研究区柽柳生物量的空间分布;在此基础上,借助于柽柳的蒸腾系数(300)计算出整个研究区内柽柳的耗水量.结果表明:研究区柽柳地上生物量为69644.7 t,单位面积生物量为0.78 kg.m-2;河岸边柽柳生境适宜,生物量较大;研究区柽柳蒸散的总水量为2.1×107m3,多年平均耗水量的空间分布范围在30～386 mm.
Based on the field observation on the Tamarix ramosissima populations in the lower reaches of Heihe River,the relationship models between the aboveground biomass of T.ramosissima and its morphological features（basal diameter,height,and canopy perimeter） were built.In the mean time,the land use/cover of the study area was classified by the decision tree classification with high resolution image（QuickBird）,the distribution of T.ramosissima was extracted from classification map,and the morphological feature（canopy perimeter） of T.ramosissima was calculated with ArcGIS 9.2.On the bases of these,the spatial distribution of T.ramosissima aboveground biomass in the study area was estimated.Finally,the spatial distribution of the water consumption of T.ramosissima in the study area was calculated by the transpiration coefficient（300） and the aboveground biomass.The results showed that the aboveground biomass of T.ramosissima was 69644.7 t,and the biomass per unit area was 0.78 kg·m-2.Spatially,the habitats along the banks of Heihe River were suitable for T.ramosissima,and thus,this tree species had a high biomass.The total amount of water consumption of T.ramosissima in the study area was 2.1×107 m3,and the annual mean water consumption of T.ramosissima ranged from 30 mm to 386 mm.
出处
《应用生态学报》
CAS
CSCD
北大核心
2010年第8期1940-1946,共7页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(30770387
40671067)
国家环境保护公益性项目(NEPCP200809098)资助
关键词
黑河下游
柽柳
地上生物量
耗水量
高分辨率影像
the lower reaches of Heihe River
Tamarix ramosissima
aboveground biomass
water consumption
QuickBird images.
