不同遮荫处理对秋枫幼苗生长的影响

以一年生秋枫(Bischofia javanica)幼苗为试材,采用可塑性及模糊隶属函数值法综合评价分析方法,研究了不同遮荫程度(100％NS (natural sunshine)、41.3％ NS、14.6％ NS和3.6％NS)对秋枫幼苗生长的影响,以期得出秋枫的耐荫性,为其苗木生产提供科学依据,结果表明:随着遮荫程度的增大,秋枫幼苗的苗高增长量、地径增长量、叶面积、鲜质量(地下部分、地上部分、整株)、干质量(地下部分、地上部分、整株)均先高后降,均在41.3％NS下达到最大值;而根总体积、根总长度、根总表面积、总根尖数、总根平均直径均呈不断降低的变化趋势.通过生长指标的综合分析得出秋枫幼苗具有中度耐荫性.

Effects of Shading Treatment on the Growth of Bischofia javanica Seedlings

With annual Bischofia javanica seedlings as experimental material,the plasticity and comprehensive evaluation methods were employed to investigate the effects of different shading degrees (100％ NS (natural sunshine),41.3％ NS,14.6％NS and 3.6％ NS) on B.javanica seedlings growth,so as to obtain the shade tolerance in B.javanica.The results showed that with the shading degree increasing,the seedling height increment,diameter increment,leaf area,fresh weights (aboveground part,underground part and whole plant) and dry weights (aboveground part,underground part and whole plant) of B.javanica seedlings all increased first and then decreased,and reached peak values under 41.3％ NS,while the total root length,average root diameter,total surface area,total root volume and total root number all presented a decreasing trend.Also the comprehensive evaluation by subordinate function value method and plasticity analysis were carried out on these growth indexes.It was concluded that B.javanica seedlings have medium shade tolerance from the comprehensive analysis of growth indexes.