Karst Plant Drepanostachyum Community Ecology, Propagation And Cultivation

Because of higher Economic value and Ecological value of Drepanostachyum luodianense (Yi et R. S. Wang) Kengf. we study to the community ecology, reproduce and cultivation of it,the result show that:1. In relation to typical Karst shrub community and grassland, we find that the capacity of soil-reinforcement, water-restrain, fertilizer- conservation is more evident in Drepanostachyum luodianense (Yi et R. S. Wang) Keng f.community and its canopy, litter layer , humus layer enables to capture more rainfall. The Drepanostachyum luodianense (Yi et R. S.. Wang) Keng f.community can also observably decreases soil bulk in woodland, increases soil porosity ,enhances normal soil water content, capillary moisture capacity and saturation moisture content, and what's more , is benefits to strengthen water-storage, water-restrain and water-infiltration, evidently increases soil corrosion resistance and anti-erosion property , and significantly accelerates soil maturation process and increases soil fertility.2. Study on leaf area of Drepanostachyum luodianense (Yi et R. S. Wang) Keng f.shows that there is a tight relationship between the leaf size and diameter at breast height (DBH),the leaf area tends to increase with increasing DBH, proves apparent positive linearity correlation existing in these two factors. The same close relationship is find between leaf area index (LAI) and photosynthesis velocity. With higher LAI and more leaf volume, solar energy utilizing efficiency enhances and at the same time the output enlarges, however, when the LAI reaches to a certain extent, the solar energy utilizing efficiency and output are instead of declining. It is showed that the optimal LAI is 7.2891, at this degree, unit area of the bamboo woods enables to assimilate solar energy at most efficiency. Corresponding density of bamboo community as to optimal LAT is for 1 clump /m² and the number of plants for 20/ clump.3. In this paper a improved interference model used for bamboo neighborhood interferenceresearch is advanced and displayed as follows: l_i=sum from i=1 to N(B_ij²H_ij²/B₁H₁+A_ij²/A₁)×1/l_ij². we discover thatinterference index is jointly determined by neighborhoods and genets' crown size and their height as well as their contiguous distance. However, in the perspective of the whole sample, the contiguous distance of neighborhoods and genets is actually the density of the samples. There is a significant negative correlation between interference index and genet's crown, height, the first branch height, the index tends to stable as each factor reaching a certain region. The negative correlation relationship between each factors and the interference index differs, with increase of different factors, downward trend of the index is somewhat of gently or rapid. For dissimilar sample density, the interference index decided by same factors and same values is different. In the restoration process of Karst ecosystem, when using Drepanostachyum luodianense (Yi et R. S. Wang) Kengf. as pioneer plant species, we should fully take consideration of interference if operating and constructing Drepanostachyum luodianense (Yi et R. S. Wang) Keng f.community. Our study provides theoretical support to Drepanostachyum luodianense (Yi et R. S. Wang) Kengf. construction and operation and even extending to the whole bamboo genus.4. Abundant vigor seeds exist in the seed bank of planted or naturalDrepanostachyum luodianense (Yi et R. S. Wang) Kengf. community and in which herbs are main components of the two types seed bank. 10 families and 18 genera seed types are found in natural forest and in planted forest respectively 7 and 8.While natural forest reserve of seed bank is 7000.00 /m², plantation is 1141.67 /m².Species types and reserves of soil seed bank in natural forest are much richer than plantation, for reason that except for there are seeds of existing dominant species and other major species, there is still plenty of plant seeds of early succession. Seed germination can be divided into three stages in natural and planted forest: from May 2nd to May 11th for germination of the early stages when less number of seeds germinating; from May 12th to July 19th for germination of boom during which kinds of seeds germinate in each sample, this stage can be divided into two germination peak, the first mainly seeds of herbal vegetations and the second mainly shrubs and small arbor types; July 20th to 29th for late germination and in this stage seed germination almost stops. Seed quantity displays a decreasing trend from the upper to down in the vertical spatial distribution. Along with the increasing soil depth, the longer time seeds in the soil preserves, the more lost their vitality and resulting less seed reserves and species types. And more, seed reserves would be influenced if vertical distribution of seed bank is under a certain degree of human disturbance.5. We discover 161 plant types in the Drepanostachyum luodianense (Yi et R. S. Wang) Keng f. community, including 33 species of arbors, 77 kinds of shrubs, and woody rattans 8 kinds, herbs with 43 kinds. For all of them belonging to 56 families and 121 genera, this form of constitution is a little decentralization. A stronger tropical and obviously transitional char- acteristics are presented in the community in which Drepanostachyum luodianense (Yi et R. S. Wang) Kengf.is the dominate specie, whileSpiraeajaponica L. f.. Spiraea blumeiG.Don,Bauhinia. blakeana,Myrsine africana,Ficus tikoua Bur, Sageretia thea (Osbeck)these six being the co-constructive species. Trait of life form spectrum in Drepanostachyum ludianense community accords to basic characteristics of subtropical vegetation. Comparing to plantation, species richness,ecological dominance and diversity index for natural forest is higher.6. Survival rate of transplanted Drepanostachyum luodianense (Yi et R. S. Wang) Kengf. seedling cultivation is influenced by cutting age, auxin types and the concentration. Under the impact of same auxin types and concentration, Survival rate of la cuttings are clearly higher than 2a and 3a; Under the impact of same cuttings and auxin concentration, the ABT,NAA and IAA are same; the identical auxin types and cutting age, concentration of 100mg.kg^-1 and 500 mg.kg-1 make survival rate higher than that of other two concentrations. Hence, the optimal combination for Drepanostachyum luodianense (Yi et R. S. Wang) Kengf. cutting transplant is la cuttings, immersion with ABT,NAA,IAA 1h at 100mg.kg^-1 or 10s at 500 mg.kg^-1 of concentration, the optimal survival rate is around 50%.Survival rate of Drepanostachyum luodianense (Yi et R. S. Wang) Keng f. seedlings cultivation using bury burl treatment,1a buried burls is higher than 2a and 3a under same burl cutting pattern and same ABT solution concentration; under same age and same ABT solution concentration, bi-burl cutting pattern is better than single burl cutting; under same age and same burl cutting pattern, ABT solution at 100 mg.kg^-1 makes survival rate higher than at 50 mg.kg^-1,150 mg.kg^-1,200 mg.kg^-1 concentration. Thus, the optimal combination for Drepanostachyum luodianense (Yi et R. S. Wang) Kengf. seedlings cultivation using bury burl treatment is 2a burls and dispose of ABT solution at 100 mg.kg^-1, the optimal survival rate is around 50%.Because of Drepanostachyum luodianense (Yi et R. S. Wang) Kengf. bury burl treatment using multi-level disposal, in which buried burl combined with multi-level stem, survival rate of buried burls treated by ABT solution at 50 mg.kg^-1 is higher than at 100 mg.kg^-1,150 mg.kg^-1,200 mg.kg^-1 when employing different ABT solution concentration. Hence, the optimal method is treating buried burl with 50mg.kg^-1 ABT concentration, the optimal survival rate is around 54%.Survival rate of seedling cultivation with layerage disposal under same ABT solution concentration, half pressure treatment is significant higher than whole pressure. Under same layerage disposal, ABT solution at 100 mg.kg^-1 makes survival rate higher than at 50 mg.kg^-1,150 mg.kg^-1,200 mg.kg^-1 concentration. The optimal configuration is using ABT solution at 100 mg.kg^-1 and layering with half pressure, the optimal survival rate is around 64%.Employing consecutive Drepanostachyum luodianense (Yi et R. S. Wang) Kengf. seedling cultivation, their survival rate significantly different when using dissimilar offshoot ways. Survival rate is higher when using dual-individual offshoot comparing to single offshoot. Its optimal combination is treatment of dual-individual offshoot and survival rate is around 70%. 7.To appraise the forestation value of mountain cultivation techniques about Drepanostachyum luodianense (Yi et R. S. Wang) Keng f., several indicator are selected,including new plants number after one year's cultivation in sample, sample survive rate ,the biomass per unit area in sample. The main effect of forestation involves planting density, age of the venter bamboo, fertilizer types and fertilizer amount. As for the survival rate, optimal planting density is 1 m×1m and 1 m×2m, optimal age of the venter bamboo is 1a, optimal fertilizer types is admixture fertilizer and the amount is 0.2kg.As regards to the new plants number, influence of the density,age of the venter bamboo and optimal fertilizer types is no significant difference, but no significant difference with amount. For biomass per unit area in sample, optimal planting density is 1 m×1m and 1 m×2m, age of the venter bamboo is no significant difference, optimal fertilizer types is admixture fertilizer, amount has no significant different. Therefore, optimal combination of cultivation techniques for Drepanostachyum luodianense (Yi et R. S. Wang) Kengf.is 1a venter bamboo, 1m×1m planting density, admixture fertilizer and with 0.2kg amountthe study based for the reconstruction of ecosystem of karst with Drepanostachyum luodianense (Yi et R. S. Wang) Kengf.