The preserving rate,tree height,crown growth of the stands which have been block transformed by adopting measures(e.g.,using superior clones of Casuarina equisetifolia) on the behind greenbelts are 51.17%,2.3%,and 25.71% higher than CK(except 1.2cm lower than mean DBH) compared with remain-aged-belts.

The mean relative precision of DBH,tree height,volume comes to 99.22%,99.73%,98.33% by predicting 32,34 aged forest stand,the results showed that Grey-Markov could be used to predict the growth of L.kaempferi plantation with high precision.

Eucalyptus cloeziana is a potential saw timber species,the study on provenances and families shows that mean HT and mean DBH arrives to 7.45 m and 7.10 cm at 2.5 years old,and there are significant differences between provenances and families for all growth traits.

The heritability of HT,DBH and Volume of family are 71.1 %,75.1 % and 68.5%,and also the heritability of HT、DBH and Volume appearing to be the older the bigger.

It concluded that Lushuihe provenance are the best compared with other sites from height and diameter heritability no matter individual and family,which has made an increases of 20% and 20.6% to plus individual and 10.64% and 10.63% to family.

The average tree volume,height and diameter of 6 superior families were above 0.033 339 m3,11.31 cm,6.62 m respectively which had average genetic gains above 30%,9%,11%. These superior families could be used for seed orchard and vegetative propagation.

After cultivation for 4 years, the mean diameter at breast height of triennial seedling bamboo forest can reach 2. 7 cm, and that of mother bamboo cultivated in the same period is 5. 1 cm.

In the seventh year after infestation by the lobbolly mealybug, diameter at breast height, height and annual volume of the nine -year- old slash pine declined by 10.31% , 20.00% and 13.41% respectively . The volume loss amounted to 1.701 m3 per hectare.

Quadratic regressive orthogonal design for density of bamboo and age structure showed that the regression equation of yield and quantity of shoot, the number from individual bamboo, individual weight, average diameter at breast height of one-year-old bamboo and economic profit fitted very well at different level, and the regressive result was significant(F0.1≥5.54) and terrible significant(F0.05≥10.1).

When the breast diameter ranges from 4 to 11 cm, internodal length can reach the maximum of 50-65cm as the node is 10-15. The conclusion of this study may provide basic data for exploitation and utilization of B. wenchouensis

Preliminary Theoretic Study on Basal Area at Breast Height per Hectare Determined by the Method of 100 Times of Circles of Forest Stand Average Breast Diameter(三)——Method and characteristics

Preliminary Theoretic Study on Section Area per Hectare Determined by the Method of 100 Times of Circles of Forest Stand Average Breast Diameter II——Error Analysis and Correction Coefficient

It's seedling height and breast diameter exceeded P.tomentosa 34.02%and 19.94% respectively under the same condition, and it was not obvious difference with triploid P. tomentosa.

Results showed that the tree's sapwood area was closely related to diameter at breast height (DBH).

Single tree's daily water consumption ascended as DBH and sapwood area increased.

The average height and DBH growth of three-year-old clones were 28.6% and 16.7%, respectively, higher than those from seedlings, and average gain of wood density reached 8.7%.

Diameter at breast height (DBH) was positively related to the contents of organic matter in the soil, and the contents of N, P and K in the tree leaves had correlation coefficients of 0.967, 0.955, 0.988 and 0.972, respectively.

Diameter at breast height (DBH) and tree height in the intercropped plantation were 50.5%-136.7% and 27%-59.5% higher than those of the CK, respectively.

The problem of reconstruction of the function from the data of its integrals over half circles A ? H with centers at the diameter of H is studied.

Furthermore, its connectivity, diameter and transitivity (vertex-, edge-) are also determined.

The k-diameter, combining connectivity with diameter, of G is the minimum integer dk(G) for which between any two vertices in G there are at least k internally vertex-disjoint paths of length at most dk(G).

Furthermore, these conditions are sharp and the upper bound d of k-diameter is best possible.

This paper presents an exact formula for the cutwidth of trees with diameter at most 4.

The growth processes of height and diameter at breast height were divided into three stages: a fast growing period, a stable growing period and a slow growing period.

Results showed that the tree's sapwood area was closely related to diameter at breast height (DBH).

Diameter at breast height (DBH) was positively related to the contents of organic matter in the soil, and the contents of N, P and K in the tree leaves had correlation coefficients of 0.967, 0.955, 0.988 and 0.972, respectively.

Diameter at breast height (DBH) and tree height in the intercropped plantation were 50.5%-136.7% and 27%-59.5% higher than those of the CK, respectively.

The results revealed that direction and degree of slope, average diameter at breast height in populations, and population density were the main influencing factors.