| The impacts of thinning and fertilization on soil nutrient and tree growth in near-mature plantation of Cryptonmeria fortunei were studied by setting up three treatments, including thinning plus fertilization, thinning without
fertilization and no-tending measures, respectively. The nutrition N, P, K in soil and the height and DBH of plantation were
investigated and analyzed. The results showed that at the 020 cm layer, the content of available K showed significant
differences between the treatments of thinning with fertilization and no-tending measures, while the contents of available P
and hydrolysable N didnt significantly change with different treatments. The content of soil nutrients changed irregularly
and not significantly at 20 40 cm layer. The growth increments of height and DBH in the thinned and fertilized plantation
were higher than those in the other treatments, particularly, the growth of DBH had very significant differences between the
thinned and fertilized stand and no-tending measures stand. The significant correlation was observed between the content
of hydrolysable N and the growth of DBH. In addition, the highly significant correlation exited between the content of
available K at upper layer and the content of available P at both layers. The thinning and fertilization improves the nutrient
environment and increases the growth level of near mature C. fortunei plantation simultaneously. |
