论文部分内容阅读
对雷州林业局营造桉树与厚荚相思混交林进行生物量测定及对土壤影响的分析结果表明∶尾叶桉（无性系ＭＬＡ）与厚荚相思混交林６年生地上部分群体生物量比尾叶桉纯林多３６．６％以上，单株叶量、细根行间混交的尾叶桉分别比纯林的尾叶桉多３８．４％，８２．８％；带状混交的尾叶桉比纯林的尾叶桉分别多１９．５％，４．７％，林分叶量带状混交林比纯林大４．９倍。４年生时混交林凋落物干重比纯林多３１％以上。混交林０～３０ｃｍ土层有机质、全氮、全钾含量分别比纯林多１７．２％，２６．９％，１９．３％。
The biomass of eucalyptus and Acacia mangium mixed forest was analyzed by Leizhou Forestry Bureau. The results showed that the aboveground biomass of six-year-old mixed forest of Eucalyptus urophylla and Climax japonica was higher than that of Eucalyptus urophylla More than 36.6%, leaf number per plant, fine root-row mixed Eucalyptus urophylla were more than the pure forest of Eucalyptus urophylla more than 38.4%, 82.8%; banded Eucalyptus caudatum than pure forest Of Eucalyptus urophylla were 19.5% and 4.7% respectively, and the stand-leaf mixed belt was 4.9 times larger than that of pure forest. 4-year-old mixed forest litter more than 31% dry weight more than pure. The contents of organic matter, total nitrogen and total potassium in 0 ~ 30cm soil layer in mixed forest were 17.2%, 26.9% and 19.3% more than pure forest respectively.