there are 14 bird species in the edge habitat between the meadow-steppe and Pinus sylvestris var. mongolica natural mature forest (denoted by MPN), and its diversity index is 2.2348;
Among the middle-age forest (4~7 years), the lumber is suitable to make paper with the requested length by 0.6~1.0 mm, such as blotting paper and so on. The mature forest (8 years and above) is suitable to make paper with the requested length by 0.8~1.1 mm, such as manifold paper and so on.
(2)The time that Chinese fir mature forest stemflow begins is 8 to 50 min later than the rainfall began. The stemflow stopped 47 to 140 min later than the rainfall ended.
The results showed the trend of soil IFI changes was partial "U", namely, during the course of artificial Picea succession, soil IFI decreased sharply at the initial stage, after artificial Picea reaches mature forest, soil IFI recovered slowly and reached soil IFI of natural coniferous forest finally.
For the sake of promoting the reform of capitalization management in Longmen area, in accordance with forest resources inventory data, species and age groups, the assets appraisal of mature forest, semi---mature forest, juvenile forest was respectively carried out by method of market price to calculate, method of resulting the current value, method of replacement cost;
Research was conducted on the influence of fertilization with four kinds of nutrient elements on the wood basic properties of Pinus massoniana in near mature forest.
Comprehensive evaluation of soil fertility showed the(results:) natural forest>young stand>near mature stand>half-mature stand>mature forest,namely,with the stand ages increasing,soil fertility began to decrease rapidly because of the slow litter decomposition.
Through analyzing the types of the preferential flow in the study area, it indicates that the perceptible type of the preferential flow in young, mid-aged and over-mature is the approximate connected macropore flow and the one in the mature forest soil is unsaturated gravitational flow which is dominated by wetness front.
For instance, the biomass proportion(tree layer: shrub layer: herb layer) in A bEes mid-aged forest is 100:0.6:0.2, but inA bEes mature forest is 100:3.9:0.4, the leaf area index in both community are 7.620,
We studied the distribution of anurans in savanna, regrowth and mature forest at the mouth of the Tapajós river in Brazilian Amazonia.
The C fixed capacity of renewed forest with middle-aged trees is higher than that of mature forest.
Spring territories of 17 adult capercaillie (Tetrao urogallus L.) cocks were 10-79 ha in extent; they varied inversely in size with the relative proportion of mature forest within them.
The number of resident cocks at leks increased with the amount of mature forest within a 1 km radius of each lek center.
In one area with intensive logging, interlek distance increased with decreasing amounts of mature forest between them.
A increment of main forest communities in the forest region of the Daxingan mountain is discussed by means of checking up 23 plots which were set up in 1954. For young forest of form, Larix gmelinii, the current annual increment is, 5.94m~3/ha; the mature forest is 0.90m~3/ha and overmature forest is -0.11m~3/ha; the middle-aged forest of Pinns sylvestris var. mongolica 2.53m~3/ha; the mature and overmature forest 1.34m~3/ha; the forest of Betula platyphylla 1.55m~3/ha and...
A increment of main forest communities in the forest region of the Daxingan mountain is discussed by means of checking up 23 plots which were set up in 1954. For young forest of form, Larix gmelinii, the current annual increment is, 5.94m~3/ha; the mature forest is 0.90m~3/ha and overmature forest is -0.11m~3/ha; the middle-aged forest of Pinns sylvestris var. mongolica 2.53m~3/ha; the mature and overmature forest 1.34m~3/ha; the forest of Betula platyphylla 1.55m~3/ha and forest of davurica 1.70m~3/ha. The author indicates that attending felling should be speedily exploited or annual loss would be 1100 million yuan Per year.
Chifeng is located in lnner Mongolia, where sand dunes prevail, and where the climate is severe and dry, and the soil poor. Based on such natural conditions, different forest management strategies are recommended to meet different situations: For those "small old trees" planted in wind--eroded pits and on gentle slopes of sand land, the desirable measures include timely irragation and cultivation and the application of ammonium sulfate fertilizer. For close stands, thinning twice before main harvest...
Chifeng is located in lnner Mongolia, where sand dunes prevail, and where the climate is severe and dry, and the soil poor. Based on such natural conditions, different forest management strategies are recommended to meet different situations: For those "small old trees" planted in wind--eroded pits and on gentle slopes of sand land, the desirable measures include timely irragation and cultivation and the application of ammonium sulfate fertilizer. For close stands, thinning twice before main harvest is recommended, with the first thinning taking place at the age of 14 years, to remove 25% of the trees, and the second thinning at the age of 16--18 years, to remove 30% of the remaining trees. The number of trees finally left over should be no less than 50 trees per mu. For mature forests, cutting and regenaration should be executed in time. The main harvest could be done at the age of 22--24 years in small patches, usually 3--4 mu each, never exceeding 10. Artificial regeneration is to follow immediately, with poplar species in case that the soil conditions are good, and with Chinese pine and Mongolian Scotch pine for poor soil, in order to form patched mixed forests of coniferous and broad--leaved trees.
In accordance with the data of annual volume increments of 99 trees, 220 year-old Korean pine, the age groups of natural Korean pine forests are studied and analysed by the method of category assembling. The results are as follows: young forests, 1—80 years;middle age forests, 81—140 years; near mature forests, 141—160 years; mature forests, 161—200 years;over mature forests, over 201 years.Through variance analysis and multi-layered comparison, it shows that the differences...
In accordance with the data of annual volume increments of 99 trees, 220 year-old Korean pine, the age groups of natural Korean pine forests are studied and analysed by the method of category assembling. The results are as follows: young forests, 1—80 years;middle age forests, 81—140 years; near mature forests, 141—160 years; mature forests, 161—200 years;over mature forests, over 201 years.Through variance analysis and multi-layered comparison, it shows that the differences of annual volume increments among the age groups are significant, and it is demonstrated that the abormentioned standard is scientific and reasonable. Perhaps this standard is better than that in the"some technical rules of investigating forest resources" issued by the Ministry of Forestry of China in 1982.
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