The Growth And Soil Characteristics Research For Different Structure Of Schima Superba Forest

This article selects the schima superba of pure forest, pinus elliottii schima superba mixedneedle and pinus elliottii broadly schima superba forest at gi’an, taihe region of Jiangxiprovince as the research object, and with schima superba forest as a contrast. Carried outthe soil physical properties, chemical properties, soil total organic carbon nitrogen and thegrowth condition of schima superba.This research aims to reveal the different effect forforest soil function of schima superba forest stand structure and growth differences ofschima superba forest plantation with natural forest, explore its influence mechanism andthe influence law of schima superba and provides the theory basis for construction andsustainable management of plantations.The main conclusions are as follows:(1) It’s had different influence on soil physical properties in schima superba for a group ofdifferent patterns of vegetation restoration. In improving soil bulk density, porosity,water-holding capacity, etc, schima superba mixed pure forest is better than that ofneedle and pinus elliottii broadly schima superba forest. In addition, the forest of pinuselliottii inefficient after seeding schima superba, reduce soil bulk density, porosity andwater-holding capacity, soil texture to improve.(2) The pure forest is best in enhancing soil available nutrients, followed by needle mixed.At the same time, in view of the coniferous pure forest after seeding schima superbaperformance, the improvement of the soil nutrient situation of reached certain. On theother hand, by schima superba of coniferous forest after modification, can significantlyimprove the input of soil organic carbon, at the same time, the guarantee of nitrogen ata certain level, suggesting that this local tree species for inefficient use of schimasuperba coniferous forest is modified to improve the soil nutrient have obvious effect.(3) Different site conditions for the growth of schima superba and biomass accumulationeffect is different, the secondary site conditions more favorable influence on the growthof schima superba sapling forest, a forestation of schima superba incrementaccumulation generally concentrated in the young forest that the first8a and reachmature forest after14a, schima superba tree height and volume growth is relativelystable, and7after a forestation a-9a,11a-13a certain time periods of slow growth.(4) Natural forests and plantations each organ biomass comparison show that theunderground part of the natural forest biomass levels were significantly higher thanthat of plantation, part and underground part of the natural forest and the earth ratio is0.23, slightly higher than plantations of0.19, it shows that natural forest plantations ofeach organ biomass allocation ratio more balanced, it can provide reference forplantation of build.