Forest development type(FDT) is an expectation pattern for forest management object. Based on investigation data and reference to other stands data in the similar environment,FDT of Pinus caribaea in Baisha County,Hai...Forest development type(FDT) is an expectation pattern for forest management object. Based on investigation data and reference to other stands data in the similar environment,FDT of Pinus caribaea in Baisha County,Hainan Province was designed. Accordidng to the condition of forest stand,it was the object to transform pure coniferous stand to close to nature stand with the structure of coniferous broadleafed mixed forest. On the other hand,visualization of FDT by LMS(landscape management system),was performed for management Pinus caribaea in future.展开更多
The effects of litter removal on soil properties in a Pinus caribaea stand were studied by comparing with a litter reserved stand.Results showed that the mean diameter at breast height(DBH) and mean tree height in the...The effects of litter removal on soil properties in a Pinus caribaea stand were studied by comparing with a litter reserved stand.Results showed that the mean diameter at breast height(DBH) and mean tree height in the litter removal stand were 21% and 11% smaller than those in the litter reserved stand,respectively.Soil physical properties of the litter removal stand became poor due to litter removal with an increase of 5% in soil bulk density and decrease of 6%,7%,7%,10% and 4% in capillary porosity,non-capillary porosity,total porosity,capillary water and natural water content,respectively,and the contents of clay significantly decreased by 16%;After litter removal,the soil organic matter,total N,total P,total K,alkalized N and available K significantly decreased by 43%,64%,11%,40%,32% and 14.5%,respectively,and available P decreased by 2%;The number of bacteria decreased by 8%,and the numbers of fungi and actinomyces significantly decreased by 38% and 63%,respectively,and the activities of urease,acid phosphatase and catalase significantly decreased by 55%,69% and 72%,respectively.展开更多
文摘Forest development type(FDT) is an expectation pattern for forest management object. Based on investigation data and reference to other stands data in the similar environment,FDT of Pinus caribaea in Baisha County,Hainan Province was designed. Accordidng to the condition of forest stand,it was the object to transform pure coniferous stand to close to nature stand with the structure of coniferous broadleafed mixed forest. On the other hand,visualization of FDT by LMS(landscape management system),was performed for management Pinus caribaea in future.
文摘松类杂种直到20世纪中期才开始被培育利用,如窄果松×辐射松（Pinus attenuata×P.radiata）、欧洲落叶松×日本落叶松（Larix decidua×L.kaempferi）等（Dungey,2001）。同时,松属种间的一些杂种在其亲本自然分布区外获得较大成功1）（Nikles,2000;Peter,1979;Khurana et al.,1998;Lopez-Upton,1999）。同样。
文摘The effects of litter removal on soil properties in a Pinus caribaea stand were studied by comparing with a litter reserved stand.Results showed that the mean diameter at breast height(DBH) and mean tree height in the litter removal stand were 21% and 11% smaller than those in the litter reserved stand,respectively.Soil physical properties of the litter removal stand became poor due to litter removal with an increase of 5% in soil bulk density and decrease of 6%,7%,7%,10% and 4% in capillary porosity,non-capillary porosity,total porosity,capillary water and natural water content,respectively,and the contents of clay significantly decreased by 16%;After litter removal,the soil organic matter,total N,total P,total K,alkalized N and available K significantly decreased by 43%,64%,11%,40%,32% and 14.5%,respectively,and available P decreased by 2%;The number of bacteria decreased by 8%,and the numbers of fungi and actinomyces significantly decreased by 38% and 63%,respectively,and the activities of urease,acid phosphatase and catalase significantly decreased by 55%,69% and 72%,respectively.
