| The study area is located in the gulf region surrounding the forest farm and jiangping dongxing city, think of the village, the village of hundreds of pp-The planting ofeucalyptus plantation caused by the change of soil physical and chemical properties,the undergrowth biodiversity of plant changes of research and analysis. Finally putforward the scientific development of eucalyptus plantation suggestion measures.The results of the study show that, forest woodland soil jiang ping eucalyptusexcept available P (<5mg/kg) and the available K (<50mg/kg) belong to serious soilorganic matter, the poor, the N, P and K are all all belong to the fertile level; From onegeneration and two generations of0-60cm soil layer forest the average situation, thesoil pH value, and the P, exchangeable Ca and exchange for one generation of Mghigher than2generation Lin, respectively, compared with the second generation Linhigh of3.62%,1.56%,79.67%and55.96%; And the soil organic matter, total N, K,the effective K is higher than the1and2and Lin, than l generation of Linrespectively high of3.75%,1.56%,2.08%and1.61%; The soil of N and P in effectivehydrolysis first generation and second generations forest are equal. Therefore, inaddition to exchangeable Ca and exchange sex Mg greater difference between outside,0~60cm soil two generations of Lin difference is not great. However, according tothe different soil hierarchical analysis, the situation is much more complex. At0to20cm soil layer, except for l P2generations and generations woodland equal outside,other nutrient elements are l and forest land greater than2and forest land, amongthem in exchangeable for Ca and exchange the biggest difference of Mg, than twogenerations respectively126.97%and65.61%higher Lin; Second is the P andhydrolysis N, high17.85%and25.00%respectively; All the difference of N is alsogreat,7.5%higher than the two generations; Other nutrients, the difference betweenthe small, about between4%~5%,20to40cm soil layer, one generation of forestsoil pH value, and the P, effective P, exchangeable Ca and exchangeable Mg than two generations respectively4.56%,14.27%, and Lin high of2.29%,61.12%and45.00%;Instead, two generations of forest soils of organic matter, total K, hydrolyzed N,effective K than one generation high Lin respectively18.78%,2.04%,43.75%and26.69%; All the N but no difference.40to60cm soil layer, one generation of forestsoil pH value and17.96%higher than2Lin, organic matter a few no difference, the N,P, K, all the hydrolysis of N and P for water effect than1and2and Lin,9.90%,7.61%,11.4%,13%and2.34%, and the rest of the effective K, exchangeable Ca andexchangeable Mg is l and higher than the second generation Lin Lin, respectively,compared with the second generation Lin high2.31%,19.15%and47.7%respectively.In September2011, pp-area of forest jiang ping hundreds of one generationeucalyptus artificial forest1810m x10m research found in samples of the plant asfollows: in one generation of eucalyptus plantation forest54species of plants of thecommunist party of China’s found, belonging to31families of50. Two generations ofartificial forest plants were found eucalyptus of31, belong to21families and genera.According to one generation of eucalyptus plantation and two generations ofeucalyptus plantation each18l0m×l0m kind of square of statistics, two generationsof panax species than one generation Lin reduced23, decline rate is42.6%. In theshrub layer of plants species composition, one generation Lin is from Chan tree(Neolitsea chuii Merr.) and YanFuMu (Rhus chinensis Mill.) primarily, but twogenerations is Lin YanFuMu (Rhus chinensis Mill.) and the green (Geum aleppicumJacq.) which is; In herb layer, one generation Lin is WuJieMang (Miscanthusfloridulus (Lab.) Warb. Ex Schum et Laut.) for advantage, and two generations is LinImperata (Imperata cylindrica (Linn.) Beauv.) for advantage. Even in the visibleeucalyptus planted the advantages of the undergrowth of changed. Along with theincrease of even planted algebra, undergrowth of the species richness reduce is quiteobvious. Even the plant community species diversity in the reduction of ecologicaladvantages degree added. |
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