甘肃省不同栽植区速生柳热值及其与环境因素的相关性研究

Caloric value and correlation analysis with environment factors of fast growing willow in Gansu Privince

【目的】速生柳是重要的速生用材和生物质能源树种,通过研究甘肃省速生柳的热值及其与环境因素的相关性,可进一步选择适宜的速生柳种植地区,为将来速生柳的推广种植及营造能源林提供依据.【方法】本研究以酒泉市肃州区下河清镇、武威市凉州区长城乡、兰州市永登县中堡镇、张掖市高台县南华镇及山丹县清泉镇5个主要速生柳栽植区为采样区,测定各栽植区速生柳植株干质量热值,并通过相关性分析及主成分分析方法研究速生柳热值与年均温、无霜期、日照时数及≥10℃有效积温、土壤pH值、含盐量、有机质含量等10个环境因素的相关性.【结果】(1)5个栽植区速生柳热值由高到低依次为下河清>南华>武威>永登>山丹,5个栽植区速生柳平均热值为19.519 MJ/kg;(2)速生柳热值与栽植区≥10℃有效积温、无霜期及日照时数呈正相关,其中与≥10℃有效积温相关性极显著,与无霜期及日照时数相关性显著,热值与土壤pH呈负相关,相关性极显著.【结论】速生柳属于高能热值植物,影响甘肃速生柳热值的主要因素为≥10℃有效积温等气象因素及土壤盐碱化程度.

【Objective】Fast growing willows（Umbraculifera）are an important fast growing timber and biomass-energy tree species.Research of caloric value of fast growing willows in Gansu Province and analysis the correlation between caloric value and environment factor could prove the basis for the construction of fast growing willows energy forest.【Method】The sampling areas of this experiment are located at Xiaheqing Wown（Suzhou area,Jiuquan City）,Changcheng Town（Liangzhou area,Wuwei City）,Zhongbu city（Yongdeng County,Lanzhou City）,Nanhua Town（Gaotai County,Zhangye City）and Qingquan Town（Shandan County,Zhangye City）in Gansu Province.This study measured the gross caloric value of fast growing willows in five sampling area and analysis the correlations between caloric value and annual temperature,frostless season,sunshine hours,effective accumulated temperature,soil pH,salt content and so on.【Result】The order of caloric value of fast growing willow is Xiaheqing〉 Nanhua〉Changcheng〉zhongbu Qingquan.The average caloric values of five sampling areas is 19.519 MJ/kg.Caloric value of fast growing willow has a high significant positive correlation with effective accumulation（≥10 ℃）,positive correlation with sunshine hours and frostless season,significant negative correlation with soil pH.【Conclusion】Fasting growing fast is a high caloric value tree species.The most effective environment factors on caloric value of fast growing willow are effective accumulated temperature（≥10 ℃）and soil pH.