以籼稻“11402”为主要研究对象，NB为基本培养基进行组织培养试验，统计其出愈率情况，分析不同浓度单糖、双糖和多糖对水稻成熟胚出愈率的影响，得到葡萄糖、蔗糖和淀粉作为单一碳源的最佳浓度和两种碳源的最佳混合配比浓度，使得水稻成熟胚出愈率和愈伤组织质量得到较大提高。试验结果表明：在单一碳源中浓度为40g·L-1最好，单糖（葡萄糖）对水稻成熟胚的出愈率影响最小，二糖（蔗糖）对水稻成熟胚的出愈率影响最大，多糖（淀粉）次之，糖类的混合配比比单一的糖类出愈率更高，其最佳混合配比是在蔗糖与淀粉总量为40g·-1下，且蔗糖与淀粉浓度比为3：1时为最佳，出愈率最高．质量较好。

本文在介绍休闲农业与乡村旅游的发展过程及特点的基础上,分析了景德镇休闲农业与乡村旅游发展现状、特点和存在的问题,提出了发展对策。要大力挖掘农村自然人文资源,丰富旅游文化内涵;搞好休闲农业规划工作;拓宽资金渠道;加强体验经济与休闲农业产品开发;引进高素质人才,加大经营主体和服务人员的培训力度。

本文从休闲农业园植物的选择与利用的现状着手,阐述了景德镇当地的休闲农业园景观植物开发与利用的现状,出现的主要问题,针对这些问题提出一些可供参考的景观植物种植模式,以丰富景观层次,达到生态环境的美化与经济效应的提高。

The community structure and water holding capacity of litter and soil of Eucalyptus urophylta ×E.eamalducensis plantations under different management densities in Yong'an City were studied.The results showed that the management density obviously affected the plantation structure,which had significant correlations to DHB and tree height,with correlation coefficient of-0.99 and-0.93,respectively,and that to stand volume with r=0.84.The effects of densities on species diversities from shrub layer to herb layer were different,which had significant correlation to shrub layer with r=0.94,and poor correlation to herb layer with r=-0.52.The species composition of undergrowth layer were great different under 5 different densities,and the vegetation yield under low density was the biggest.The litter maximum water holding capacity had significant correlation to stand densities with r=0.94.

With the human society′s forest resources rising expectations, as well as the operating idea of forest resources continues to progress, and the thought about sustainable management of forest resources has been accepted by more and more people and as a guiding principle in the new era of forest management. Based on the status of forest resources at home and abroad, we try to apply the basic principles of landscape ecology to sustainable management of forest resources, which not only broadens the application areas of principles of landscape ecology, but also enriches and develops the theories for forest resources management, to promote the sustainable development of forest resources.

The nylon bag method was adopted to make a one-year observation of the decomposition of four natural forests litter in Wuyishan Scenery District.The results showed that the weightlessness ratio of four natural forests could be ranked in a decreasing order,that is,broadleaf leaf litter(63.1%) Phyllostachys heterocycla cv.Pubescens leaf litter(60.2%) Chinese fir leaf litter(51.6%) broadleaf twig litter(45.6%) Chinese fir twig litter(39.3%) Phyllostachys pubescens twig litter(39.2%) Pinus massoniana leaf litter(36.7%) Pinus massoniana twig litter(25.3%).The order of decomposition concentration(K values) of the four forest types was broadleaf leaf litter(0.996 a-1) Phyllostachys pubescens leaf litter(0.921 a-1) Chinese fir leaf litter(0.725 a-1) broadleaf twig litter(0.608 a-1) Phyllostachys pubescens twig litter(0.499 a-1) Chinese fir twig litter(0.497 a-1) Pinus massoniana leaf litter(0.457 a-1) Pinus massoniana twig litter(0.305 a-1).The organic C concentration of 8 kinds of litters decreased gently and gradually in general,and the loss proportion of the organic C of broadleaved forest and Phyllostachys heterocycla forest was higher than that of Pinus massoniana and Cunninghamia lanceolata forest.The content of P was in a fluctuating state of enrichment,and the P returning amount of Phyllostachys heterocycla was lower than that of other natural forests.The changing tendency of N concentration differed greatly,and the leaf decomposing rate of the broadleaved forests was the highest,most of whose composition was enriched in the later period.Except the branches of broadleaved trees,K concentration of all other litters decreased monotonously with the passage of decomposing time,which falls into leaching-release mode.The study aimed to discover the ecosystem function,nutrient decomposition rule,soil fertility condition of the four kinds of sub-tropical natural forest,providing scientific basis for protection and management of natural forests in Wuyishan Scenery District.

Based on the investigation of the Cryptromeria fortunei communities in Tianbaoyan National Nature Reserve,the variation of competition index of the natural population of C.fortunei under varied disturbance intensities was analyzed by means of Hegyi single tree competition index model,and the correlation model was set up between the DBH value of the natural population of C.fortunei and the change of the competition index of C.fortunei populations under disturbance of different intensities.The mathematic model was established according to the relationship between competition index and DBH.The results showed that with the increase of the disturbance intensities,both the general competition index of the natural population of C.fortunei and the intra-specific competition index of the surveyed three sample plots decreased obviously,whereas the inter-specific competition index increased significantly.The order of the general and inner-specific competition intensity was CI(1) CI(2) CI(3) and CIinner(1) CIinner(2) CIinner(3).The relationship between the competition intensity and DBH value of the studied plants closely followed the power function model as CI=161.163 9 ·D1.112 6,and it was proven by trial tests that the model could be well used to predict the competition intensity of C.fortunei populations in this area.

Community-based ecotourism is in favor of conservation and sustainable development of the certain natural reserve.During investigating and analyzing the ecotourism in the Tianbaoyan Nature Reserve,we applied the method which combined status survey with questionnaire survey,and found that in the process of developing Tianbaoyan Nature Reserve' ecotourism,the participation rate of the community was very low,the tourism interest was not also highly obvious,and the conservation lacked stimulating mechanisms to guide the local people to protect resources in the area.Thus,based on the present situation,we brought out some effective measures to promote local ecotourism to healthily develop.

High conservation value forest is an important foundation for forest certification and sustainable management.Based on the concept and objective of high conservation value forest,regarding the application of high conservation value forest as the breakthrough point,this paper describes high conservation value forest's potential application value from the aspects of sustainable forest management,forest certification,timber exchange and forestry investment,vegetation restoration in fragile ecology areas,landscape planning in nature reserve,fire districtand community forestry etc.And this research will play an positive role in the further study on HCVFs.

Two phases of remote sensing image data taken respectively in 1992 and 2000 were interpreted through ERDAS software and the change in landscape pattern of Longkou Municipality was analyzed with two categories of indices from the landscape pattern and landscape levels by means of using FRAGSTATS software.The results showed that the orchard land area,farming land area without irrigation facilities and the construction land area significantly increased,while the irrigated land area and forested land area decreased.The reasons for the change in landscape pattern were also analyzed in the paper.