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以塔里木河下游12次人工输水的生态效益评估为长远目标,利用阿拉干断面2005、2010年的胡杨(Populus euphratica)荒漠河岸林生态调查数据,分析了距河道50 m以内的345棵幼龄胡杨(胸径≤4 cm)的生长量和株数在不同时间和空间尺度上的变化,探讨了幼龄胡杨株数增减原因和胸径生长对人工输水的响应。结果表明:2005年实测幼龄胡杨株数为345棵,到2010年,其中42.61%的胡杨胸径增长明显,36.23%的胡杨胸径增长不明显,14.20%的幼龄胡杨在河道疏通工程中消失,6.96%的幼龄胡杨由于缺水而枯死。2005年的幼龄胡杨株数占总胡杨的比例为16.91%,2010年比例增加到31.17%。在时间尺度上,随着应急输水次数和累计输水量的增加,幼龄胡杨胸径生长量和株数显著增多。在空间尺度上,随着距河道距离的增加,幼龄胡杨的胸径生长量和株数呈现递减趋势,胸径生长量与距河道距离之间的对数相关性较高(R2=0.728 1),幼龄胡杨株数和距河道距离的多项式相关系数为0.7531。
Taking the eco-efficiency assessment of 12 artificial water deliveries in the lower reaches of the Tarim River as a long-term goal, this paper analyzed the desert riparian forest ecological survey data of Populus euphratica in 2005 and 2010 in the Arakan section, and analyzed 345 young people The growth and the number of Populus euphratica (DBH ≤ 4 cm) in different time and space scales were studied. The reasons for the increase and decrease of Populus euphratica population and the DBH response to artificial water delivery were discussed. The results showed that the number of young Populus euphratica in 2005 was 345, and by the year 2010, 42.61% of Populus euphratica had a significant increase in DBH, 36.23% of Populus euphratica DBH growth was not obvious, 14.20% of young Populus euphratica disappeared in the river dredging project, 6.96 Young Populus% died of water shortages. In 2005, the proportion of young Populus euphratica in total Populus euphratica was 16.91%, and the proportion in 2010 increased to 31.17%. On the time scale, with the increase of the number of emergency water delivery and the cumulative water delivery, the DBH growth and number of young poplar increased significantly. On the spatial scale, with the increase of the distance from the river, the growth of DBH and number of young Populus euphratica showed a decreasing trend. The DBH growth was significantly correlated with the logarithm of distance from the river (R2 = 0.728 1) The polynomial correlation coefficient of Populus euphratica and distance from the river was 0.7531.