The Research Of Physiological Basis Of The Biochar Relieving Salt Damage Of Malus Baccata Borkh

Biochar can decompose some essential elements to promote plant growth and development because of its porous and multiple substances can adsorb harmful substances in soil.The results showed that biochar had a significant effect on soil improvement and other aspects,such as improving soil physicochemical properties,activation,retention of soil nutrients,improve soil fertility and soil,and improve plant germination and plant survival rate,seedling resistance,promoting plant growth,therefore,it is often used as a soil modifier in agricultural production.The physiological basis of salt stress in the plants of the stator was studied by using the short-term high concentration salt treatment(0.4%)and the long-term low concentration salt treatment(0.2%).The measurement index is divided into two aspects,the main part of the ground is the measurement of the plant growth and the effect on the photosynthetic fluorescence of the leaves;the underground part mainly determines the root system,including the root morphology,the active oxygen scavenging system,the glutathione cycle,the absorption of mineral elements and the mitochondrial function.The results of the test are as follows:1.Under high salt stress,the net photosynthetic rate(Pn)decreased significantly,the concentration of intercellular carbon dioxide(Ci)increased significantly,the transpiration rate(Tr)and stomatal conductance(Gs)decreased,while the addition of biochar increased Pn by 36%,Ci increased by 16.8%,Tr increased by 25%,and Gs decreased by 25.9%.Under low salinity stress,the net photosynthetic rate decreased obviously,the concentration of intercellular carbon dioxide increased,transpiration rate and stomatal conductance decreased,but the net photosynthetic rate increased by 12.5%,the concentration of intercellular carbon dioxide decreased by 2.6%,and the transpiration rate and stomatal conductance increased by 10.7% and 25.4%.2.Under high salt stress,the distribution of root length was obviously influenced,the root activity was obviously reduced and the content of MDA was obviously increased.The total root length of root system increased by 12%,the number of root tip increased by 21.9%,and the diameter of root was 21.9%.It increased by 7%,the number of branches increased by 10.3%,root activity increased by 12%,content of MDA decreased by 70.9%.Under low salt stress,the growth and development of plants were obviously inhibited,which mainly showed that the growth of stem height and rhizome leaves decreased in different degrees,and the addition of biological carbon could effectively alleviate the effect of salt stress on the root morphology of the stator,which could raise the height of tall stems by 3.3% and 2%,and the growth of roots,stems and leaves increased 7.6%,15.2%,9.0% and 6.0%.3.Under high salt stress,the activity of antioxidant enzymes in the root system increased significantly,while the addition of biological carbon reduced the activity of peroxidase by 33.5%,the activity of superoxide dismutase decreased by 26.2%,the activity of peroxidase decreased by 14.5%,the activity of ascorbic acid peroxidase was reduced by 43.8%,the activity of dehydroascorbate reductase was reduced by 8.13%,and the mono dehydroascorbate reductase was reduced.The activity was reduced by 12.8%.4.Under high salt stress,the activity of glutathione cycle decreased in root,but the activity of glutathione reductase increased by 43.9%,the activity of glutamine synthetase increased by 2.6%,the activity of glutamate synthase increased by 10.7%,and the activity of glutamate dehydrogenase increased by 14.8%.5.Under high salt stress,the uptake of other mineral elements by roots was inhibited obviously except of Na elements,and the absorption of Na elements increased.Biological carbon treatment significantly reduced the absorption of sodium in the root system,while the absorption of other elements had different degrees of relief,significantly improved the absorption of potassium,phosphorus,copper,magnesium and manganese,increased by 90.0%,90.0%,90.0%,80.0% and 80.0% respectively,and improved the absorption of zinc,calcium,nitrogen and iron increased by 45.0%,48.0%,53.8% and 60.0%.6.Under low salt stress,the growth and development of plants were obviously inhibited.The main performance of plant height,stem diameter and plant growth were inhibited,and biochar treatment could effectively alleviate the effect of salt stress on the morphological indexes of the sage.The growth of plant height and stem diameter could be increased by 3.3% and 2.0%,while the growth of root,stem and leaf could be increased by 36.6,68.0%,and 45.0%.