在云南种植的5-7年生直干桉林分中设置30块标准地,调查树高、胸径等,并采土样分析.结果表明,土壤养分对直干桉生长的影响主要在0-40cm土层,40cm以下土层影响较小.重要养分指标影响力由大到小的排列顺序为有机质>水解性N>有效B>速效K>有效P.各指标对树高生长的影响力权重为有机质0.2371、水解性N 0.2199、有效P 0.1522、速效 K 0.1719、有效 B 0.2190;各指标对胸径生长的影响力权重为有机质0.2278、水解性N 0.2195、有效P 0.1586、速效K 0.1771、有效B 0.2170.直干桉追肥时应施用有机肥,结合一定量的化肥和硼砂,化肥的N:P:K大约为1.4:1:1.1.%Thirty standard plots were set up in 5-7 years old Eucalyptus maidenii plantation in Yunnan Province. The tree height and DBH were surveyed and soil samples were collected and analyzed. The results showed that the effects of soil nutrients on the growth of E.maidenii was mainly between 0-40cm soil, soil less than 40cm was less affected. The influence order of important nutrients was as follows: organic matter>hydrolyzable N>effective B>available K>effective P with tree height influential weight of 0.237 1 organic matter, 0.219 9 hydrolytic N, 0.152 2 effective P, 0.171 9available K, 0.219 0effective B, with DBH influential weight of 0.227 8 organic matter, 0.219 5hydrolytic N, 0.158 6 effective P, 0.177 1available K, 0.217 0effective B.Organic fertilizer should be applied for E.maidenii, with combination of a certain amount of chemical fertilizer and Na2B4O7, and ratio of N:P:K could be 1.4:1:1.1.
展开▼
