| Forests are the subject of terrestrial ecosystem, forest ecosystems in the maintenance of biological diversity, hydrological regulation, clean environment, and maintain soil fertility and other aspects of the function can't be replaced.In recent years,the area of forest that incidence of pests and diseases are increasing,this is serious impact on the ecological health of forests, so the study of forest pest prevention and cure of diseases and the transformation and effective restoration of pests of forest land is great significance. This article was done to research on Cupressus funebris plantation strip reform and regeneration mode in the Yunyang County of Chongqing, analyze the differences in different widths strip reform and different tree species regeneration mode from microclimate, biodiversity,soil properties and population density of Chinolyda Flagellicornis. Our results indicated that:(1) The strip reform and artificial regeneration were influence the population density of Chinolyda Flagellicornis, there were difference between four widths strip reform, the number of egg in 20m strip,but the number of death larvae in nets was highest in 10m strip and lowest in 25m strip.There were no big difference between two regeneration modes, the population density of Chinolyda Flagellicornis was higher in ceibo strip reform than acacia strip of artificial regeneration mode.(2) The strip reform with different widths impact on soil temperature,the monthly soil temperature was significant difference between four strip reforms.The monthly soil temperature in 20m strip reform was higher than Cupressus funebris plantation and other widths strip reform from February to April, and the monthly variation was lowest in February and March.Compared the diurnal change of soil temperature, the daily rang of soil temperature in 25m strip reform was lowest,the daily variation of soil temperature in 20m,25m strip reforms were lower than Cupressus funebris plantation.The air temperature in 20m strip reform was reduced, but the strip reform has not marked influence on increase air relative humidity.(3) The proportion of growing healthy cupressus funebris has increased in strip reform with four widths, the proportion of growing healthy cupressus funebris in 20m strip reform was highest in four regions of four widths. In different regions the the proportion of growing healthy cupressus funebris was higher in artificial regeneration mode than in natural regeneration mode.Planting different species trees in artificial regeneration mode, the the proportion of growing healthy cupressus funebris in four regions of acacia strip reform was higher than in ceibo strip reform,the proportion was between 42.1% and 66.7% in acacia strip reform,but in ceibo strip reform was between 18.7% and 80%,so the effect of ceibo strip reform was relaticely good from the whole consideration.(4) The light, temperature, moisture and soil nutrient changes can make a good growth of cupressus funebris seedlings, while the number of cupressus funebris seedlings is more in strip than in cupressus funebris plantation after strip reform. The total quantity of the cupressus funebris seedlings is highest in 20m strip reform, and the difference of quantity of the cupressus funebris seedlings between four widths strip reform was not remarkable. The number of seedlings were lower in strip of natural regeneration mode.The cupressus funebris seedlings were more in different tree species,and the number of seedlings were obviously more in strips and the edge of strips than other regions,and far more in acacia strip reform than ceibo strip reform.(5) Compared the number of species after strip reform founded that it was more than before. And compared with cupressus funebris plantation found that the index of Simpson and Shannon-Wiener growed up,and the width was significantly influence of the index of Simpson, Shannon-Wiener and Pielou evenness in strip and edge of it.In shrub layer,the three indices in 25m strip reform was higher,there are significant difference has found in same region between four strips and between different regions in same strip.The diversity index of the shrub layer and herb layer in natural regeneration mode was lower in two modes. There are not distinction between two tree species strip of artificial regeneration mode, but the three indices in acacia strip reform was higher than in cupressus funebris plantation.(6) With the growth period of the strip reform, two years after the strip reform,the number of family, genus,species increased 53.84%,34.7%,11.47%.Four years after reform it's increased 77.5%,83.83%,79.41%. Species richness in shrub layer were not growing up with years increases,but the years increases was influence of species richness in herb layer,and it's useful to the richness increasing.The increase of species richness and diversity were lower in natural regeneration mode. The species richness of shrub layer in four years after tree species strip of artificial regeneration mode was increase 35.7%,16.7% separately than two years after tree species strip reform,and the species richness of herb layer growth rate was 281%,192%.The diversity index and Pielou evenness index of the shrub layer has increased,but the indices of herb layer change has certain undulatory property,the indices growth rate of acacia strip reform was higher in two tree species strip reform.(7) After a comparative analysis of experiments,the soil physics and the chemical property has had change in different widths and different tree species strip reform. Compared with the soil of Cuperessue funebris plantation, the soil total porosity increased in 0-20cm layer of different strip reform with different widths, the soil bulk density and pH value declined and soil organic matter were enhance in two layers.The soil total P were content low and Available P were grow up in 0-20cm and 20-40cm layers of four widths strip reform, the total N and Hydrolyzable N of 20m strip reform were were enhance but the total K and Available K declined in four widths strip reform of both two layers.Compared the every facts the effect of 20m width was good.There were significant difference has been found in soil Available P, Hydrolyzable N,available K between two regeneration modes,but not found in soil bulk desity,soil total porosity,pH value.The different tree species strip of artificial regeneration mode had the different influence to the soil,the soil total porosity and pH value increased, the soil bulk density declined.The soil nutrient,total N total P,total K and Available P growed up in ceibo strip,but Hydrolyzable N and Available P of soil declined.The soil organic matter reduce,and there were diffenence between the soil nutrient changing. Compared the soil physics and the chemical property in two tree species of artificial regeneration, the influence of ceibo was obvious. |
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