The result showed that the range of eating percentage either in leaf-area or weight was 0. 45%~28. 01% among various tree species, averaging 7. 71 % which had no significant influence on the tree growth.
The sample-plot survey was conducted for farmland shelterbelt in 13 counties municipal of western region of Jilin Province,China,which investigated the soil characteristics of physics and chemistry and trees growth in the shelterbelt.
This thesis studies the six main coastal protective forest models in northern JiangSu province through measuring soil physical and chemical properties、enzymatic activities and trees growth . The results are described as follows: 1. Except for catalase, the nutrient status in the top was highest.
The average soil water content of two planting density Pinus tabulaeformis plantation were lower than other stands, which interpreted that the micro-environment, forest tree growth and development of undergrowth varied with the type of stand and planting density.
We found that infestation exceeding 0.5 larvae per brachyblast significantly suppressed tree growth and reproductive organ formation.
The κ(T) and ρ(T) relations were measured on a sample cut along the direction of tree growth.
The temperature dependences κ(T) and ρ(T) of the 3C-SiC/Si biomorphic composite at a silicon content of ～30 vol % are measured for samples cut out parallel and perpendicular to the direction of tree growth.
The measurements were conducted on samples cut along (β∥) and across (β⊥) the tree growth direction.
Measurements of ρ were carried out on samples cut either along (ρ∥) or across (ρ⊥) the tree growth direction, and α was measured on a sample cut along the tree growth direction.