The Water Capacity Of Rock Wall Recover Green Matrix And Soil Microbial Activity

In recent years, the external-soil spray seeding technique is widely used to the ecological restoration on damaged mountain body. The structural composition of spray seeding matrix decides the stability and efficiency. But there is little research on the moisture physical properties of spray seeding matrix and the effect on vegetation growth. Study on the structural composition of spray seeding matrix and the soil fungi activation technique on rock slopes with a pot plant experiment and field spray seeding practices. And regarding trifolium repens,amorpha,ryegrass,calliopsis as experimental materials. The study could solve the difficult problems that water retention and the rock slope-spray seeding matrix interface integration. These theoretical and technical gist are very useful at vegetation restoration on damaged mountain body and environmental reconstruction in our country. The results as follow:(1) Effect of water holding agent on the physical properties of spray seeding matrixâ‘ Results had showed that its function was obviously different in different water holding agent content. With increasing holding agent content, density and non-capillary porosity reduced all along, but porosity and capillary porosity increased always. Especially the water holding content was more than 0.3 %, the density and non-capillary porosity were too small. So the result showed that water holding agent can obviously increase the water retention ability of spray seeding matrix.â‘¡Effect of water holding agent on spray seeding matrix anti-scour ability and anti-shearing ability were same. With increasing holding agent content, the anti-scour ability and anti-shearing ability were increased firstly and reduced. And the content of water holding agent in 0.15%~0.3 % range could Strengthen the anti-scour ability and anti-shearing ability of spray seeding matrix at a certain extent, improve vegetation growth and protection to soil face. And the anti-scour ability and anti-shearing ability of different structural spray seeding matrix strengthened with time increase, and the change of water holding agent content had no influence on temporal dynamic change tend of the anti-scour ability and anti-shearing ability .(2) Effect of water holding agent on the plant growthâ‘ The average germination rate and seedling height were higher than soil treatment. With increasing holding agent content, the germination rate and seedling height were increased firstly and reduced. The maximum germination rate of trifolium repens(12.6%),amorpha(74%) and ryegrass (19%),were on 0.3% content of water holding, but the maximum germination rate of calliopsis was on 0.2% content. The highest tall of 4 species were not on same water holding agent content, and the seedling height were not obvious different on different water holding agent content. So the effect of water holding agent content on seedling height was limit, and if achieved some peak, increasing water holding agent would decreased seedling height.â‘¡Water holding agent can field capacity. As a whole, the higher content of water holding agent, the seedling fade rates of 4 vegetations were lower on same time. On the same water holding agent content, the fade rates of 4 species vegetation were: calliopsis> ryegrass>trifolium repens> amorpha. Using Tukey multiple comparison method found that the water holding agent could prolong vegetation growth period.(3) Effect of water holding agent on the plant physiologyâ‘ The paper analyzed the diurnal change of photosynthesis and transpiration of 4 trees. The results indicated that all photosynthesis and transpiration rates of amorpha displayed two-peak pattern, the other 3 trees were one-peak pattern. The peak always present in 10:00~12:00. When the diurnal change of photosynthesis and transpiration were two-peak pattern, the second peak was lower than first one. In enough water condition, the effects of water holding agent content on 4 trees were same. With the content increasing the peak rates of 4 trees presented on different time and the change trend did not same also. The different water holding agent made the photosynthesis and transpiration rate of 4 trees displayed at three levels. Too low or more were had negative effect on photosynthesis and transpiration of vegetation. And the results showed that the 0.15%,0.2%,0.3% were best content for 4 vegetation growth.â‘¡The WUE of 4 trees were different in different water holding agent, and the diurnal change of WUE appeared obvious fluctuations, and the effect of water holding agent content on WUE did not show regularity. The paper data showed that the 4 selected trees had high water using efficiency , and all were adapt to be planted in arid soil condition area.(4) Effect of water holding agent on the water dynamic change of spray seeding matrixâ‘ The water dynamic change of spray seeding matrix with different water holding agent content were same in germination and growth period. With the content increasing, the water content of spray seeding matrix decreasing trend become slowly, and the holding water ability of spray seeding matrix strengthened, the high water time increased. But the effect of tree species was weaker.â‘¡The diurnal change of spray seeding matrix of 4 species trees were same, all were contrary with temperature. Using water holding agent could reduce water evaporation of spray seeding matrix, and enforced the water holding ability. If the water holding agent content was bigger, the evaporation water was smaller.(5) The effect of microorganism weathering to rockâ‘ The interactions between minerals and microbes, which occur widely in nature and directly result in dissolution and formation of minerals, have profound impact on the environment. Several microorganisms are isolated from the dolomite from Mufu mountain Nanjing city. Total 14 high activity microorganism strains, the 6 strains of bacteria and 8 strains of fungi. By the Microscopic observation and physiological biochemical tests, train bacteria-1 and bacteria-2 belonged to Psuedomonas, strain fungi-3 and fungi-4 were belonged to Aspergillus, fungi-5 and fungi-6 were belonged to Trichoderma and Penicillium.â‘¡The analysis indicates the growth of microorganism on rock weathering outdo obviously. Weathering can be accelerated through the direct contact with microbes, the secretion enzyme and acidic organic-matters from the microorganisms.Comprehensively evaluate effect of water holding agent content on plant growth,plant physiology and structure of spray seeding matrix, the water holding agent content of spray seeding matrix among the 0.15%~0.3% range can improve structure of spray seeding matrix and germination rate, reduce spray seeding matrix loss. So the water holding agent content of external-soil spray seeding project in Jiangsu province should in this range. At same time, reference perpetual greening technique of Japan, add soil fungi in spray seeding matrix to improve the rock slope-spray seeding matrix interface integration, achieve the perpetual greening on damaged mountain body.