The Effects Of Three Typical Subtropical Woody Plants Under Simulated Nitric-rich Acid Rain Force

In the90’s and1980’s, the type of acid rain in China basically is given priority to with sulfuric acidtype[1], in the south is a major disaster area of acid rain[2]. But as people living standard unceasingenhancement, more and more families and individuals having private cars, and continue to a largenumber of coal combustion and so on, lead to the content of sulphur and nitrogen compounds in theatmosphere. As a result, acidic gas is increasing. Therefore, the type of acid rain are gradually fromsulfuric acid type to sulphuric acid-mixed nitrate and nitric acid rain[3].The research should follow the pace of development to adapt today’s changing of the acid rain.In this study, choosing nitric acid rain as simulation,treat three kinds of subtropical woody species，Cinnamomum camphora, Schima superba and Cyclobalanopsis myrsinaefolia as the object, to explorehow three plant growth, chlorophyll content and photosynthetic physiological reaction under nitric acidrain force, as well as what will be the performance of different pH acidity treatment(Cinnamomumcamphora, Schima superba and Cyclobalanopsis myrsinaefolia is not only the edificators of many forestecosystems, but also a common edificators in Zhejiang Province). That will provide evidence ofcultivation, protection of species and forest ecosystem restoration and reconstruction to ZhejiangProvince[4]that hardest hit by acid rain as well as other subtropical regions. The results showed this:1. In growth aspect. The plant height and diameter growth of Cinnamomum camphora is inhibitedby inhibition increased with increasing acidity under short time nitric acid rain force and the growth ofCinnamomum camphora will be promoted in the long-term acid rain force. There is not significantlyaffect on the plant height and ground diameter growth of Schima superba under the short-term acid rainforce. The long-term moderate acid rain force on the growth of Schima superba acts the certain role.The growth of Cyclobalanopsis myrsinaefolia is not inhibited significantly in the short term. With thelong-term acid rain force, the plant height of Cyclobalanopsis myrsinaefolia is significantly inhibitedunder high concentrations of acid rain force and promoted its height growth in low concentrations ofacid rain force.2. In chlorophyll aspect. A short period of time nitric acid rain force will not cause significantdifference on chlorophyll of Cinnamomum camphora, Schima superba and Cyclobalanopsismyrsinaefolia. The moderate acid rain will lead chlorophyll values of Cinnamomum camphora and Schima superba to go up in long-term force. The chlorophyll of Cyclobalanopsis myrsinaefolia changesunstable under nitric acid rain in long-term force. At first, there is no impact then suppressed and at thelast it upgraded.3. In photosynthetic physiological aspect. The photosynthesis of Cinnamomum camphora, Schimasuperba and Cyclobalanopsis myrsinaefolia is inhibited in short-term acid rain force. And the degree ofinhibition of Schima superba is increased along with acid rain intensity increased. Under the stress ofthe long-term acid rain, the severe acid rain promotes the photosynthesis of Cinnamomum camphora,however, the moderate acid rain inhibites that. The photosynthesis of Schima superba is inhibited bysevere acid rain, but the moderate acid rain can improve its photosynthetic capacity in the long-termacid rain force. Different treatments of Cyclobalanopsis myrsinaefolia show the different laws under thestress of the long-term acid rain, and the severe acid rain enhances its ability to use the weak light.