Growth Responses Of Betula Platyphylla Container Seedlings To Agri-forest Composite Matrix And Nutrient Management

This experiment used Betula platyphylla as experimental material. Four kinds of common agricultural and forestry wastes (edible fungus waste, corn straw, com core, larch needle-humus) in the Northeast region, supplemented with vermiculite were composed of basic light matrixes for Betula platyphylla seedling’s growth. The morphology, mycorrhiza, the organ nutrient content and mycorrhizal growth of seedlings in different matrix, different water retaining agent and different fertilizations were observed. The results were shown as follows:1 Without water retaining agent, the water and nutrient preserving ability of agricultural and forestry wastes matrixes were almost the same as that of peat-soil matrix(CK2), but higher than that of convential nutrigive soil (CK1). With water retaining agent, the water and nutrient preseving ability of all matrixes improved significantly. The overall nitrogen, phosphorus and potassium content were significantly higher than those without water retaining agent. There were more water and nutrient left in 1% water retaining agent matrixes than those in 5%. The absorbent multiples and evaporation rate of edible fungus waste (T1) is significantly higher than com straw (T2) and corn core (T3) matrixes..Edible fungus waste mixed matrix with water retaining agent in nitrogen, phosphorus, potassium loss ratio lower 50% to 77% than CK2.2 The diameter, ratio of height to diameter, leaf area and total number of root tips of seedlings in three kinds of agir-forest waste matrixes were as good as those seedlings in CK2.The total number of root tips, the whole plant biomass, the total N content of the whole plant growing in the three kinds of agri-forestry wastes matrixes were significantly higher than those in CK1. The whole plant biomass, the total numbers of root tips and the seeding quality index in the edible fungus waste(T5) matrix were higher thand those in corn straw (T7) and corn core (T9) matrixes.3 Seedlings in different matrixes had different mycorrhizal infection rate and root hair development level. Mycorrhizal infection rate in descending order was as follows:T2> Ti> CK2>T3>CK1. Mycorrhizal infection rate of agricultural and forestry wastes mixed matrix(T1、T2、T3) was significantly higher than CK1. The root hairs number and the length of orestry wastes mixed matrixes (T1、T2、T3) were significantly greater than CK1. The root mycorrhizal infection rate of T2 was higher than that of T1 and T3. And the number and length of root hairs in T1 were higher than those in T2 and T3. Adding water retaining agent,the matrixes could promote root growth root hair development. but mycorrhizal infection rates decline.4 The fertilizer experiment showed that the height, diameter and leaf area of seedlings under exponential fertilization and APEX slow-release fertilizer were higher than those under other fertilization treatments. The total biomass of seedlings under exponential fertilization and APEX slow-release fertilizer was 4% and 13% higher than that under conventional fertilization. The height, diameter and leaf area of seedlings with 5% chicken manure fertilization were growth better than those with 3%.The total plant biomass of seedlings under exponential fertilization was higher than that with 5% chichen manure fertilizaion.5 After 1-year planting, all the seedlings cultivated in agri-forestry matrixes alived, except 7% dead. The seedlings growed as better as those cultivated in CK2 and CK1. And the seedlings with fertilization treatment before growed better than those without.