摘要
[目的]森林生物量是衡量森林生态系统结构和功能的量化指标,基于高分辨遥感数据,研究塔里木河下游荒漠林地上生物量及其空间分布特征,为定量评定研究区生态恢复、进行不同尺度遥感监测提供依据.[方法]以塔里木河下游喀尔达依断面为研究区,基于QuickBird数据,采用人机交互方法对不同地下水埋深条件下胡杨、柽柳树冠进行解译,根据解译结果采用已建立的树冠、树干与生物量估测模型,计算以胡杨、柽柳为主的荒漠林地上生物量,并分析其与地下水埋深的关系.[结果]研究区距离河0～300、300～600、600～900、900～1 200以及1 200 ～1 500 m,荒漠林地上生物量分别为11.31、2.7、2.09、1.58和1.17 t/hm2;距离河300～600 m荒漠林单位面积生物量变化最大,比距离河300 m内下降了76％.[结论]研究区林分密度及地上生物量均明显受制于地下水埋深.自2000年至2004年历经5 a的输水后,地下水埋深对荒漠植被地上生物量的影响主要集中在距离河道300m内.
[ Objective ] Forest biomass is a measure quantitative indicators of iorest ecosystem structure and function. The purpose of project aims to study the aboveground biomass of desert forest in the lower reaches of Tarim River and its spatial distribution based on high -resolution remote sensing data has important implications to quantitative assessment of the ecological restoration of the study area and remote monitoring at different scales. [ Method ] Taking Kaerdayi section in the lower reaches of Tarim River as the study area, using the method of man - computer interaction to interpret the crown of Populus euphratica and Tamarix ramossissima under different groundwater depths based on the QuickBird data, according to the interpretation results and canopy, tree trunks and the biomass estimation model which has been established, desert forest aboveground biomass of dominant Populus euphratica and Tamarix ramossissima were calculated and its rela- tionship with the groundwater depth was analyzed. [ Result ] 0 -300 m,300 -600 m ,600 -900 m,900 - 1 200 m and 1 200 -1 500 m away from the fiver,desert forest aboveground biomass was 11.31,2. 7,2. 09, 1.58 and 1.17 t/hm^2 ; biomass of the desert forest was the largest in 300 -600 m places away from th.; river, 76% lower than the biomass within 300 m area from the river. [ Conclusion ] Stand density and aboveground biomass in the study area was significantly constrained by of water transport, the influence of groundwater depth centrated in 0 -300 m place away from the river. groundwater depth. From 2000a to 2004a, after 5 years on desert vegetation aboveground biomass mainly concentrated in 0 -300 m place away from the river.
出处
《新疆农业科学》
CAS
CSCD
北大核心
2014年第11期2066-2072,共7页
Xinjiang Agricultural Sciences
基金
国家自然科学基金项目(40961027)
新疆国家级公益林典型样地监测项目
