河套灌区两种造林方式小美旱杨防护林树干生物量研究

本文以河套灌区萌生造林和移植造林小美旱杨的树干材积量作为树干生物量进行累积生长量、连年生长量、平均生长量比较研究，结果表明：从小美旱杨的累积生长量，连年生长量和平均生长量三方面分析，由于移植苗需要缓苗期，萌生苗在前期生物量增加较迅速，到生长中后期，移植苗生长较萌生苗快。通过F检验和T检验，这两种造林方式差异不显著，

TEH INVESTIGATION OF THE STEM BIOMASS OF Populus popular's IN HETAO-IRRIGATED DISTRICT

The stem volumes of Populus popular's which is produced by two different afforestation ways (produce sprout and transplant sprout)were compared in the accumulated increment,the currentannual increment,the mean annual increment of the stem increment. Results showed: based on the accumulated increment, the current annual increment, the mean annual increment,there were no significant differences in stem increment between two afforestation ways. But since the transplant sprout postpone seedling stage, so the increment of producing sprout increased quickly in early stage.