论文部分内容阅读
在雷州林业局两个试验点进行了尾叶桉无性系ＭＬＡ施肥试验，林龄３８个月生的结果表明：处理⑥（Ｐ３００ｇ／株＋Ｋ３００ｇ／株＋Ｎ１５０ｇ／株）的平均蓄积生长量为２９．２４ｍ３／ｈｍ２·ａ，比处理⑦（常规施肥，滤泥５０００ｇ／株＋Ｐ２５０ｇ／株＋Ｋ１５０ｇ／株＋Ｎ１００ｇ／株）的平均蓄积生长量２６．２６ｍ３／ｈｍ２·ａ大１１．３％，比ｃｋ（不施肥）的平均蓄积生长量６．３９ｍ３／ｈｍ２．ａ大３５７．５９％，比总体平均值１８．８１ｍ３／ｈｍ２．ａ大５５．４５％；处理⑥的１／１５ｈｍ２蓄积年生长量极显著地大于处理①、②、③，显著地大于处理④；处理⑥的经济效益比常规施肥的提高１２．６％，比不施肥的提高４５８％。
The MLA fertilization experiment was conducted at two experimental sites in Leizhou Forestry Bureau. The results of 38-month-old stands showed that the average volumetric growth of treatment ⑥ (P300g / plant + K300g / plant + N150g / plant) was 29%. 24m3 / hm2 · a, which is 11.3% larger than the average volume growth of 26.26m3 / hm2 · a in treatment ⑦ (conventional fertilization, filter 5000g / plant + P250g / plant + K150g / plant + N100g / plant) Fertilization) the average volume growth of 6.39m3 / hm2. a big 357.59%, than the overall average of 18.81m3 / hm2. a was 55.45%. The annual growth of 1 / 15hm2 accumulation in treatment ⑥ was significantly greater than that in treatment ①, ②, ③ and significantly greater than treatment ④. The economic benefit of treatment ⑥ was 12.6% higher than that of conventional fertilization 458% increase without fertilization.