查看更多>>摘要：Based on 29 stems analysis and 140 sample trees of nature Korean pine(Pinus koraiensis Sib.et Zucc.) measured on the Xiaoxing'an Mountain, effects of age ranged from 20 to 300 years on stem form were discussed and a compatible taper and volume ratio system was developed. The merchantable cubic-metre volume ratio table ofvarying log rules was constructed for nature Korean pine in this paper. Results indicated that age classes were regarded as a totality to develop taper equation, The compatible tree profile and volume ratio equation developed in this paper can be used toobtain estimates of individual tree volumes and stem profile or volume of varying merchantability limits.
查看更多>>摘要：The community ecology of Poplar-Birch forest in China was studied. It includes the distribution, classification, structure, growth, regeneration, succession and forest management. Research direction of community ecology and forest management for Poplar-Birch forest was pointed out. Further studies should be made on the relation between stand and ecological environment, the structure and dynamics, nursery role to needle leave trees, target cultivation and classification management, management of the second generation forest and the third generation forest.
查看更多>>摘要：Fire disturbance pattern of Liangshui Nature Reserve was studied by investigating fire scar tree and analyzing distribution of charcoal particle in soil-layer. The results show that: fire disturbance regular is related with the accumulation and disposition of fuels in space pattern. The fire protection measures were put forward for Liangsliui Nature Reserve.
查看更多>>摘要：The cut leaves of five pteridophyte species were evaluated on their usage in cut flowers. Two species, Lunathy rium coreanum and Dryopteris crassirhizoma, were selected. The effects of vase-holding and fresh preservation of the cut leaves under different conditions was studied. By measuring the contents of soluble protein and chlorophyll of leaves, the best methods of fresh preservation was determined with the use of fresh preservation and wet storage, L. rium coreanum (christ) Ching may last 14 days. The best liquid used to arrange flowers in a vase is 5 g/L sucrose. With the use of fresh preservation liquid and wet storage, D. crassirhizoma may last 34 days.
查看更多>>摘要：Symptoms of pine needle rust diseases was observed was observed in field in northeast region of China and surface structure of aeciospores from pines was observed on the scanning electron microscope on. It was found that the different symptoms of pine needle rust disease are directly related to surface of aeciospores. The pine needle rust disease of Pinus-Haploxylon has one symptom type (except Coleosporium pini-pumilae ) and one aeciospore type. The pine needle rust disease of Pinus-Diploxylon has three symptom types and three aeciospore types.
查看更多>>摘要：EST isozymes are one of the frequently used biochemical markers in genetic analysis of fungi, and the staining is an important process in electrophoresis analysis of studying Est. Be effects were compared among different stain recipes for Est of 3 kinds of fungi-Lentinus edodes, Pleurotus sapidus, Phellinus igriarius and 2 kinds of platits-Populus sp and Brassica chinensts. Of the four kinds of Est staining recipes tested, the recipe alpha-acetic acid-naphther showed the best effect. and followed bybeta-aceticacid-naphther, semicontent alpha-aceticacid-naphthet and alpha+beta-acetic acid-
查看更多>>摘要：Zethenia rufescentaria Motsch. has outbroken successively in the larch plantation of Jixi region and seriously damaged stands since 1990. Chemical control was studied for controlling the occurrence of the pest. The results showed as follows: When the third or the forth instar larvae was* controlled with smoke agent of 5% Lindane, the most suitable time was July 10-13. The area controlled was 2000 hm~2. The dosage was 7.5 kg/hm~2 and the mortality of the pest reached 93.5%. 25% dunilin III (flowable formulation) was used to prevent the third instar larvae. The best time was about July 5 The dosage was 150g/hm~2. The mortality of the pest reached 89.85%. 3% Hexyclan dusting was also used to control adults of the pest. The best time was before the peak of their emergence (June 3). the dosage was 11.3 kg/hm~2. The mortality of the pests reached 89.6%.
查看更多>>摘要：Dendrolimus superuns (Butler) occurred in the vast areas of Daxing'an Mountains forest, in Heilongjiang Province, in 1990. Stands damaged by D. superans seriously, intermediately and lightly show patch shape distribution within damaged area. By ordination analysis and correlation analysis between ordination factors and coordinate axis. It was found that occurrence of D. Superans in different extent is owing to the effect of forest age. composition and exposure. The tended young pure forests grown onthe sunward slopes are most seriously damaged and non-tended middle-age mixing stands grown on the sunless slopes are most lightly damaged. Therefore, in order to prevent D. superans from seriously damaging larch forests, relatively large crown density (P>0. 7) should be kept. and broad leaf trees should be also property preserved.
查看更多>>摘要：Quadraspidiotus gigas is a main kind of forest pest in Northeast China. Chilocorus Kuwanae has a strong capability of controlling Quadraspidiotus gigas. Chilocorus kuwanae was migrated and released for control of Quadraspidiotus gigas during 1992-93.The obvious control effect was obtained.
查看更多>>摘要：Heilongjiang Province has large areas of wetlands. 32 species anatidae were recorded: 5 geese (Ansersp.). 2 swans (Cygnus sp.) and 25 ducks (Anas .sp.). Some millions of geese and duck bred here before the 1960s. Because of wetland reclamation for farmland in recent years, their numbers have declined rapidly, and five species: whooper swan (Cygnus cygnus). whistling wans (Cygnus columbianus), white-fronted goose (Anser erythropus). mandarin duck (Aix galericulata ). and Chinese merganser (Mergus squamatus) are endangered. They are now protected by the China Wildlife Protection Law, promulgated in 1989. In order to protect wildlife resources, 19 natural reserves were set up in Heilongjiang Province; some species can be restored and utilized reasonably.
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