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通过小尺度生态监测与遥感数据分析获取塔里木河下游荒漠河岸林现状信息,集中对阿拉干断面设立的100hm2长期监测样方内的胡杨树进行了详细的调查,对该断面胡杨林空间分布特征及其影响因素进行了分析。研究结果表明:塔里木河下游的胡杨具有伴河生长的特性;随着离河距离的增加,胡杨株数呈递减趋势;大部分胡杨主要分布在离河道200m范围内,且其分布都与离河道距离呈显著负相关关系;与此同时随着离河岸距离增加,胡杨的密度也同样呈现降低规律。不同地下水埋深条件下生长的胡杨总体状况显示,地下水埋深,即与河道距离的近远是影响胡杨分布最重要的因素之一。
Based on the small-scale ecological monitoring and remote sensing data analysis, the status quo of desert riparian forests in the lower reaches of the Tarim River was obtained. A detailed survey was carried out on the poplar trees in 100hm2 long-term monitoring plots established in the Alashan section. The influencing factors were analyzed. The results show that Populus euphratica in the lower reaches of the Tarim River has the characteristics of companion river growth. Populus euphratica shows a decreasing trend with the increase of the distance from the river. Most Populus euphratica distributes within 200m from the river and its distribution is close to that of the river A significant negative correlation; while at the same time as the distance from the river bank increased, the density of Populus also appears to decrease. The general situation of Populus euphratica grown under different groundwater depth shows that the depth of groundwater, that is, the distance to the river course, is one of the most important factors affecting Populus euphratica distribution.