Effect On The Characteristics Of Leaf PH And Tree Growth In Subtropical Regions Under Different Simulated Acid Rain

Zhejiang Province is located in the subtropical zone, where there have been sufferedserious of acid rain harm.The frequency of acid rain and acid rain coverage area areshowing a growing trend, since records began in1980s. Application RAINS-ASIA modelsimulation found that Zhejiang province SO2emissions would remain at a high level.Sothe acid rain problem is bound to the long-term effects of the development of ZhejiangProvince, and subtropical ecosystems caused by persistent injury, particularly serious harmto the forest.And the plant leaves intracellular pH value is an important regulator of cellphysiological activities. Intracellular pH not only can regulate the activity of enzymes anda number of important metabolic processes many physiological activities, as well as cellgrowth.Therefore, the use of simulated acid rain pH characteristics of tree species leaves,to explore the links between species of the antacid sexuality with their leaves pH of thesubtropical regions of China becomes meaningful.The paper first studied in the same environmental conditions, the relationship betweenthe resistance species alone as the evaluation index and resistance of tree classificationindex obtained from the species of acidic pH value. And then studied the pH characteristicsof Elaeocarpus sylvestris, Lithocarpus glaber, Cyclobalanopsis, Camellia sinensis.As wellas studied the physiological growth indices of tree species in different simulated acid rainand the correlation between leaf pH and acid resistance indices were discussed in this paper,the main conclusions are as follows:(1) In the same environmental conditions, as a separate classification results index andspecies classification results similar acid index pH value by the species, and found that thespecies pH value is smaller, the acid resistance is better.(2) Leaf pH values mainly affected on acid rain stress、high concentrations of acidrain (pH2.5)、season acid rain and the length of time by acid rain stress.Under different simulated acid rain, chlorophyll fluorescence parameters affecteddifferently due to the different species. Ground acid rain and soil acid rain promote theElaeocarpus sylvestris of Fv/Fm. In summer, it promote the Elaeocarpus sylvestris of Fv/Fm under the simulated natural acid rain stress; In autumn, it inhibit the Elaeocarpussylvestris of Fv/Fm. Different acid rain have inhibited the Elaeocarpus sylvestris of Fv/F0,inhibition effect of soil acid rain was the most strong among them. Elaeocarpussylvestris of Yield under the ground of pH2.5treatment was significantly higher than that ofcontrol and the other two, simulated natural acid rain and soil acid rain inhibit theElaeocarpus sylvestris of Yield. Under the concentration of pH2.5acid rain treatment, theLithocarpus glaber fluorescence parameters by inhibition of acid rain. Under the groundacid rain and simulated natural acid rain have a role of promotion in the concentration ofpH2.5and pH4.0acid rain.PH5.6soil treatments inhibit Lithocarpus glaber fluorescenceparameters. With the time of spraying acid rain increasing, Cyclobalanopsis chlorophyllfluorescence parameters be significantly inhibited under the concentration of pH2.5acidrain in autumn. The concentration of pH2.5and pH4.0acid rain promotes theCyclobalanopsis chlorophyll fluorescence parameters. The impact of acid rain onchlorophyll fluorescence parameters of Camellia sinensis is not obvious. In general, withthe time of spraying acid rain increasing, Elaeocarpus sylvestris and Camellia sinensisshowed better adaptability. Lithocarpus glaber and Cyclobalanopsis showed betteradaptability under pH4.0and pH5.6acid rain treatment, damaged by severe acid rain, notadapt with acid rain of pH2.5.Except Camellia sinensis, other three species under the ground heavy acidity (pH2.5),the tree species leaves pH value and plant height, ground diameter increase was asignificant negative correlation (r=-0.9998, P <0.05),under the simulated natural acid rainheavy acidity (pH2.5),it also showed a significant negative correlation (r=-0.8018，P＜0.05). Under the soil acid rain processing and other ground concentration acid rain, leavesthe pH value and the amount of plant growth is not relevant. Under heavy acidity (pH2.5),leaves pH and the SPAD was highly significant positive correlation (r=0.9952, P <0.01);under mild acidity (pH5.6), showing absolutely positive correlation (r=1.000, P <0.01).Under the acid rain in soil heavy acidity (pH2.5), was highly significant positivecorrelation. Under the simulated natural acid rain (pH2.5), leaves pH and the SPAD was asignificant positive correlation (r=0.8077，P＜0.05); under mild acidity (pH5.6), showing positive correlation(r=0.9032，P＜0.05).That leaves pH value greater plant SPAD reductionis larger the smaller the contrary. In general, under acid rain stress, leaves pH value andchlorophyll fluorescence parameters, showing negative correlation. Under the ground acidrain (pH2.5and pH4.0), leaves the pH value and Fv/Fm is a significant negativecorrelation (r=-0.9988, P <0.05; r=-0.9982, P <0.05); Under the simulated natural acidrain (pH2.5),leaves pH value and Fv/Fm is a negative correlation (r=-0.9001，P＜0.05).Under the soil acid rain processing, leaves the pH value and Fv/Fm is not relevant. Underthe acid rain stress (pH2.5), leaves pH value and Fv/F0in the presence of a positivecorrelation. Yield and leaves the pH value of the correlation is not obvious.