The author discusses the esthetics characteristic of the Zhuque forest's park from the concept of esthetics value and the esthetics innate character of the forest park.Then it makes sure the proportion of the factor that use to evaluate the esthetics value with the method of level analysis.On the foundation of this.The thesis evaluates and analyzes the unusual of the landscape,the degree of diversification,natural and mystery,science and history value,the coordination to the forest park in the path of classification.Synthesizing the scores and the proportion of every factor.It manifests the whole grade of this forest landscape form the method of adding with the proportion.Consider the construction of the Zhuque forest park in future.

Results of the experiment on culturing excised embryos show that the embryo of Pinus tabulaeformis has the property of dormancy.Seeds belong to the category of medium dormancy and the germination of each seed is different.Cold stratification has better effects than GA_3 on relieving dormancy and has a higher rate,a bigger energy and a higher speed of germination.Though GA_3 plays a positive role on breaking dormancy,its effectiveness is not as good as cold stratification.It is not indispensable that excised embryos be treated by GA_3.Cold stratification is one of the best methods to pre-treat seeds of Pinus tabulaeformis before sowing because it is a convenient way and costs low.

It was investigated that Platycladus orientalis plantations soil fertility changing of the horizontal zone of steep slope on Loess Plateau. The results indicated that: in the 80cm soil matter, total nitrogen, available nitrogen, available potassium and the cation exchange capacity were enhanced by 141.0%, 18.8%, 20.9% and 48.0%, respectively, and pH decreased by 4.7%. In the soil horizon of 0~40cm and 41~80cm, calcium carbonate decreased by 6.3%~16.8% and enhanced by 11.6%~24.0%, respectively too.

The Predatory effect of the adults and high year old larva of Coccinella seplempunctata (Linnaeus)to Aphis citricola Van der Goot in apple trees were tested in die field. The results showed that The last time is 1min12s, Aphid belly and Hind legs are Lift, Stomach tube Excrete Constandy, The Prey for food function of the Coccinella seplempunctata (Linnaeus)could match The equation- Ⅱ of Holling very well, the prey function of the Coccinella seplempunctata (Linnaeus)in Different density could reflect with The maths model of Hasse 11. Coccinella seplempunctata(Linnaeus) Not only Prey for food, but also have the Trouble to the Aphis citricola Van der Goot on lives and Movable place. Prey effect increase with the Aphis citricola Van der Goot density increase and derease with the Coccinella seplempunctata(Linnaeus) density increase. If you Move 3000 Coccinella seplempunctata (Linnaeus)from Wheat field Aphis citricola Van der Goot will disappear in two weeks.It has vary good value in the Wheat and fruit mixs area.

Bentonite, CaCO_3, and SiO_3 were selected as additive material to improve the mechanical strength of immobilized granule with the cracking numbers of the granule as index. The results showed that the strength could be enhanced obviously by adding 0.8% of CaCO_3 to the microbial carrier.

Iridoids is a large kind of natural products occurring in plants. They have many pharmacological functions. Researches on the iridoids are reviewed from the aspects of their structure, distribution, extraction, isolation and measurement.

Analysis on physical and chemical properities of evenly soil interplanted with herbage of apple orchard and CK showed that the soil density was reduced by 6.5% and the capacity of soil holding water increased by 7.19% in the 0~40 cm soil layer, The content of soil organic matter in 0~20 cm soil layer was increased obviously, grass family herbage by 0.1% per year and the pule family herbage by 0.15% per year.Planting herbage in the apple orchard decreased the content of tatal N?toal P? total K indicated that nutrient competition existsed between herbage and apple in this soil layer. there fore fertilizer should be strengthened applying for the herbage. But ofter planting herbage the content of hydrolytic N,available P and available K in the 0~40 cm soil layer was increased. This benefits to nutrient absorption of apple.The grass family herbage activated organic P more effectively than the pule family herbage. The pule family herbage increased hydrolytic N better than the grass family. So interplanting and rotation of different herbage are benefit to playing the affect of different herbage on soil fertility in apple orchard in Weibei areas.

The mature embryos of Pinus bangeana were used as explants to induce adventitious buds. The result showed that the basic medium and hormone played a determinative role in producing the adventitious buds. The optimal combination of the medium was MS with 3.5 mg·L~(-1)6-BA , 0.4 mg·L~(-1)NAA and 0.1 mg·L~(-1) IBA. The inducing rate was 71%, and the average rate of propagation was 9. Hormone had no good use to the buds growing. Adding 1% activated charcoal could promote the buds producing and growing .

The chosen type and seed region were selected by method of analyzing the contends of bioactive onstituents in the leaves of Eucommia ulmoides. superior trees were selected, clones were reproduced and clone test stands were established based on this method. 14 chosen clones were preliminary selected by way of Fuzzy integrated-analysis on the contents of constituents and yields. Superior clones Qingzhong 1- 4 were finally selected which were steady and had high contents of constituents. The finding is very fundamental to intensive cultivation and comprehensive exploitation.

By means of cage rearing experiment and field investigation, Gansu zokor's feeding habit, distribution at plantation site and harmfulness to tree species of plantation were studied. The results showned that with the increase of duration,the feeding amount of zokor to tree roots decreased speedily,but to grass roots changed slightly. Meanwhile, the lifespan of zokor was no more than 10 days after feeding with tree roots alone, but it wasn't influenced apparently by feeding grass roots alone. The grass with taproot is not only the main food for zokor, but also a limiting factor to the population of zokor. Feeding tree roots is not because the zokor like it, but no other foods to take at food short seasons. The higher canopy density of plantation, the less forest grassland or underground, then the less population of Guansu zokor and the less harmful to the plantation. Spring and autumn are the main seasons in which the harmfulness occurred to the young trees, especially in the spring. The best way to control Guansu zokor is to decrease the food source, especially grass with tap root, by bionomic control measurements such as loosening the topsoil to destruct the hole system, control of grass in the plantation site by manual or herbicide, and popularization of agro-forestry measurements such as intercropping the Periua frutescensl which hold a function of zokor repelling. These measurements can decrease the zokor density by 73.1%, 79.36% and 87.01%, respectively.

Species and distribution and grade of rare endanger and protection of national endangered protection plants that distribute in Northwest China were described , research on rare endangered protection plants and work in protection in this area analysed. On the basis of this, advices and countermeasures of protection is expounded: strengthen legislation construction and tendentious education; reinforce scientific research; enhance protection management and scheme task.

A multi-sites trial of the seedling cultivation was carried out within shaanxi through the introduction of the seeds from similar climlate areas in Austria and Germany. The results showed the seeds, especially those with Germany provenaces, had a high germination rate and a low disease infection rate. The seedlings growed well in hurseries and had a high tolerance to different stresses and a wide rang of adaptabilities, showing good prospect for introduction. Some key technique for seedling cultivation was also summerized.

This paper deals with the growth quantity and resistance to diseases in seedling period of four Populus deltiodes×P.cathayana cl. introduced. The results show that the No.'93-8-17'clone growed quickly and appeared high resistance to diseases than other clones.The growth of height in 1-year nursery stock is 7.9%,13.4%,15.1% taller than other three clone separately,and 2.6% smaller than No.'SL-4'.The growth of base diameter is (7.4)%,11.0%,16.6% higher than other three clone separately,and 12.6% higher than No.'SL-4'. The average index harmed by pests and diseases in two years is 15.6, similar to No.'SL-4',and is the lowest one of the four clones introduced. A observation of growing character in seedling period concluded that the No.'93-8-17' clone has a high survival rate, an even emergence of seedling,a well-distributed growth,a good seedling-trunk, and a late leaf falling. Consequently, introduction of P. deltiodes×P.cathayana cl. '93-8-17' in Guanzhong area of Shannxi has a broad prospects.

The studies on F_1 seedling of Populus deltoides×P. cathayana of individual trees of different provenances showed that mother parent and father parent had obvious effect on growth of F_1 seedling,Chang An's P. cathayana as male parent was better and P. deltoides as female parent was better too. As for the degree of infection there was not a evident variation among provenances and a little variation among individual trees of the same provenance.