成熟材含量的高低决定木材性质的优劣，合理界定幼龄材与成熟材的分界点，准确预测成熟材材质有利于木材高效加工利用。为了确定人工林班克松的成熟期和预测成熟材解剖性质，采用支持向量机（SVM）界定幼龄材与成熟材的分界点，在此基础上利用幼龄材解剖性质预测成熟材解剖性质。结果表明：人工林班克松幼龄材与成熟材的分界点在树木生长的第18年；成熟期解剖性质明显优于幼龄期，变化较幼龄期平缓；成熟预测误差低、相关性高；预测曲线能够体现解剖性质整体的变化趋势，但对解剖性质测试集突变点及其之后的变化情况表现不足。 | Wood qualities and properties were depended on the mature wood content. Determining the demarcation between juvenile and mature wood and predicting mature wood properties accurately play an important role on wood efficient utilization. In order to demarcate juvenile and mature wood of Pinus banksiana plantation and predict the anatomical properties of mature wood based on the anatomical properties of juvenile wood, support vector machines （SVM） was used. Results showed that the dividing point of juvenile and mature wood of Pinus banksiana plantation is 18＇h years. The anatomical properties of mature wood were excellent with gently change than those of juvenile one. Mature wood prediction has low deviation, high correlation. The prediction curves can indicate the overall trend of anatomical properties, while have weak performance on catastrophe point and the following changing properties of the test set.

【目的】对速溶藏茶产品进行品质评价。【方法】常规成分测定法和感官审评法。【结果】该速溶藏茶的浸提加工工艺的浸提效率相对较高，生产剩余茶渣的总水浸出物含量仅（69．75±3．49）g／kg，藏茶原料中的水浸出物残留率仅约20％；速溶藏茶产品内含物质较为丰富，原茶粉的主要内含成分含量分别为：茶多酚（129．95士2．00）g／kg，游离氨基酸（16．68士o．17）g／kg，咖啡碱（41．71±1．08）g／kg，可溶性糖（99．62±1．16）g／kg；3种速溶藏茶粉的各项审评因子评分及审评总分差异极显著，其中速溶藏茶原茶粉的审评评分较低，综合评分低于雅安藏茶，而速溶酥油茶粉和速溶甜奶茶粉的综合评分较藏茶综合评分较高，且其香气和滋味评分均高于80．0分，品质相对较好。【结论】该速溶藏茶产品内含物质丰富，品质较好；但原茶粉品质一般，生产工艺应进一步改进、优化，以提高产品品质。 | [Objective] The aim of this paper was to evaluate the quality of instant Tibet tea. [Method] The chemical composition was measured and sensory quality was evaluated in this stud- y. [Results] The extraction efficiency of instant Tibet tea was relatively high. The total water extract of tea residue was only （69.75-~3.49） g/kg and residue rate of water extract in Tibet tea was about 200//oo. The internal substances of instant Tibet tea were abundant. The main compo- nents of original instant Tibet tea powder were as followed： polyphenol （129.95-＋2.00） g/kg, free amino acid （16.68_＋0.17） g/kg, caffeine （41.71-＋1.08） g/kg and soluble sugar （99.62-9 1.16） g/kg. The project factors and total score of three instant Tibet tea products were signifi- cantly different. The sensory score of original instant Tibet tea was the lowest and comprehensive score of original instant Tibet tea was lower than that of Yaan Tibet tea. Nevertheless, compre- hensive score of instant butter tea and sweet tea powders were higher compared to the instant Ti- bet tea. The aroma and taste score was more than 80.0 and the quality was relatively good. [Con- clusion] The internal substances of instant Tibet tea were abundant and its quality was relatively good. However, the quality of original tea powder was ordinary. In order to improve product quality, the production process should he further improved and optimized.

研究人工老化过程中毛竹种子活力及其生理生化变化过程.结果表明：人工老化处理后,种子发芽率、发芽指数和活力指数均先快速下降后缓慢下降,活力指数下降较发芽率和发芽指数快.老化6天时活力指数下降72％,老化12天时种子活力基本丧失.伴随着种子活力下降,表现出种子浸出液相对电导率和可溶性糖含量升高,MDA含量升高,POD,SOD和CAT酶活性降低,可溶性蛋白质含量降低,内源GA3和IAA含量降低,ABA含量升高,GA3/ABA比值降低等一系列生理生化变化.相关分析表明：SOD活性、CAT活性、可溶性蛋白和GA3,IAA,GA3/ABA,与种子活力呈极显著正相关;种子浸出液相对电导率、MDA和ABA含量呈极显著负相关.膜脂过氧化引起的生物膜损伤是加速毛竹种子老化的重要原因,内源激素失衡也是影响种子萌发和加速老化的主要因素之一. | The seed vigor of moso bamboo （Phyllostachys edulis） and the physiological and biochemical changes involved in seed deterioration were investigated in this article.The results showed that the germination rate,germination index,and vigor index all decreased rapidly in the beginning and slowly later in response to the artifical aging.The vigor index of seeds decreased more rapidly than the germination rate and germination index.The vigor index of moso bamboo seeds decreased by 70％ after 6 days of artificially accelerated aging,and lost almost all after 12 days of artificially accelerated aging.With the seed vigor declining,the physiological and biochemical changes were observed.The relative electric conductivity of the seed leachate,soluble sugar content,and MDA content of the seed extract were increased,while the soluble protein content,and the activity of antioxidant enzymes SOD,CAT and POD were declined.The content of GA3 and IAA,and GA3/ABA ratio were decreased.The correlation analysis indicated there was a very significant positive correlation between the activity of antioxidant enzymes SOD and CAT,the soluble protein content,the content of GA3 and IAA,GA3/ABA ratio and the seed vigor,while there was a very significant negative correlation between the relative electrical conductivity,MDA content,ABA content and the seed vigor.It was suggested that the injury to the membrance integrality caused by peroxidation of membrane lipids was one the main mechanisms to cause or accelerate seed deterioration in the artificial aging.The balance loss of endogenous hormones also played an important role in influencing seed germination and speeding up the seed deterioration.