Plantation under the forest is a good way of agroforestry,but the canopy closure has a great influence on understory herbs’growth.In the study,different canopy closures of Phyllostachys pubescens forests were set up ...Plantation under the forest is a good way of agroforestry,but the canopy closure has a great influence on understory herbs’growth.In the study,different canopy closures of Phyllostachys pubescens forests were set up to explore its influence on the growth of Ilex latifolia Thunb.The photosynthetic characteristics of Ilex latifolia leaves under different canopy closures were determined by Li-6400 portable photosynthetic system.The results showed that the net photosynthetic rate curve of Ilex latifolia leaves of T1(canopy closure of 0.56)was bimodal with an obvious"midday depression"phenomenon,while the net photosynthetic rate curves of T2(canopy closure of 0.72)and T3(canopy closure of 0.86)were unimodal.The results of light response curve showed that the photosynthetically active radiation and transpiration rate reduced with the increasing of canopy closures.The photosynthetically active radiation,transpiration rate,stomatal conductance,and net photosynthetic rate of Ilex latifolia leaves of T2 were higher than those of T3.Although the net photosynthetic rate of T2 was lower than that of T1,it had no obvious photo-inhibition which affected plant growth.Overall,the canopy closure of 0.72 was more suitable for the growth of Ilex latifolia.The herb plantation in the bamboo forest should be considered with the canopy closure for a better growth.展开更多
Atomic force microscope(AFM) was used to investigate the arrangement of cellulose microfibrils (CMF) in Moso bamboo (Phyllostachys pubescens) fibers. Two methods of sample preparation were used here for different purp...Atomic force microscope(AFM) was used to investigate the arrangement of cellulose microfibrils (CMF) in Moso bamboo (Phyllostachys pubescens) fibers. Two methods of sample preparation were used here for different purposes. The first method was chemical maceration with a mixture of hydrogen peroxide and glacial acetic acid, through which the obtained fibers were suitable for observing the orientation of CMF in the primary wal1. The other method was to prepare tangential microtomed sections with a thickness of approximately 30 μm, which was used to investigate the arrangement of CMF in the inner wall of cell cavity of bamboo fibers. The results indicated that the CMF are randomly oriented in the primary wall while in the inner wall of cell cavity they are nearly vertical to the long axis of fibers , which is similar to the arrangement of CMF in the corresponding layer of wood fibers. Meanwhile, the highly oriented arrangement of CMF is also observed in a certain layer of bamboo fibers, though it is incapable of determining which layer it is in this study. The pilot investigation demonstrates that AFM is a powerful tool for the high-resolution observation of CMF in bamboo fibers, meanwhile it has the advantages of simple procedure of sample preparation and easy operation compared to the traditional transmission electron microscopy.展开更多
In order to research the effect of preservative penetrability, CuAz (copper azole) was used for the preservative, and pieces of Moso bamboo (Phyllostachys pubescens) were used for the experimental materials in this st...In order to research the effect of preservative penetrability, CuAz (copper azole) was used for the preservative, and pieces of Moso bamboo (Phyllostachys pubescens) were used for the experimental materials in this study. The vacuum pressure process was used to treat bamboo pieces. The results showed as follows: 1) Main treatment factors were preservative concentration and applied pressure; 2) In the same technology, both the retention and the weight proportion gain of the samples without node were less than those of ones with node, due to special structure of bamboo node; 3) For the samples without node, a good result could be gotten when the preservative concentration was from 1% to 2%, treatment pressure was 0.6 MPa, and treatment time was 30 min. And for the bamboo samples with node, a good result can be gotten when the concentration was 2%, treatment pressure was 0.4 MPa, and treatment time was 30 min. This study demonstrates that the interaction between preservative and bamboo can be improved by adjusting the parameters.展开更多
Blocks of Moso bamboo were used as experimental materials to test the toxicity of CuAz preservative on decay fungi by the lab test in this paper. The result showed that the natural decay resistance of 4-year-old Mao b...Blocks of Moso bamboo were used as experimental materials to test the toxicity of CuAz preservative on decay fungi by the lab test in this paper. The result showed that the natural decay resistance of 4-year-old Mao bamboo is moderate, and the resistance to brown fungi is stronger than that to white fungi. The anti-fungi properties of CuAz preservative at the retention of 3.3 kg/m3 are equal to those of CCA-C and ACQ-B at the retention of about 4.0 kg/m3 , and obviously superior to those of organic acids preservatives.展开更多
The field trial of Moso bamboo treated with 9 copper preservatives was conducted in Guangzhou, China. The result showed that two formulations of ammonia-based copper azole (F17 and F18 ) and a formulation of amine cop...The field trial of Moso bamboo treated with 9 copper preservatives was conducted in Guangzhou, China. The result showed that two formulations of ammonia-based copper azole (F17 and F18 ) and a formulation of amine copper added with boron (F10), as well as 2 kinds of ammonia-based ACQ, at the copper retention of 3.2 kg/m3 or over, were very resistant to decay and termites after the 5- year field test. And the durability of ACQ-B treated Moso bamboo was similar to that of treated Masson pine and slash pine at the same copper level.展开更多
文摘Plantation under the forest is a good way of agroforestry,but the canopy closure has a great influence on understory herbs’growth.In the study,different canopy closures of Phyllostachys pubescens forests were set up to explore its influence on the growth of Ilex latifolia Thunb.The photosynthetic characteristics of Ilex latifolia leaves under different canopy closures were determined by Li-6400 portable photosynthetic system.The results showed that the net photosynthetic rate curve of Ilex latifolia leaves of T1(canopy closure of 0.56)was bimodal with an obvious"midday depression"phenomenon,while the net photosynthetic rate curves of T2(canopy closure of 0.72)and T3(canopy closure of 0.86)were unimodal.The results of light response curve showed that the photosynthetically active radiation and transpiration rate reduced with the increasing of canopy closures.The photosynthetically active radiation,transpiration rate,stomatal conductance,and net photosynthetic rate of Ilex latifolia leaves of T2 were higher than those of T3.Although the net photosynthetic rate of T2 was lower than that of T1,it had no obvious photo-inhibition which affected plant growth.Overall,the canopy closure of 0.72 was more suitable for the growth of Ilex latifolia.The herb plantation in the bamboo forest should be considered with the canopy closure for a better growth.
基金Supported by the "948" Project of the State Forestry Administration (2002-45)the National Natural Science Foundation Project(30400337)the Key Project of Science & Technology Supporting Programs Funded by China during the 11th Five-year Plan(2006BAD19B0402)
文摘Atomic force microscope(AFM) was used to investigate the arrangement of cellulose microfibrils (CMF) in Moso bamboo (Phyllostachys pubescens) fibers. Two methods of sample preparation were used here for different purposes. The first method was chemical maceration with a mixture of hydrogen peroxide and glacial acetic acid, through which the obtained fibers were suitable for observing the orientation of CMF in the primary wal1. The other method was to prepare tangential microtomed sections with a thickness of approximately 30 μm, which was used to investigate the arrangement of CMF in the inner wall of cell cavity of bamboo fibers. The results indicated that the CMF are randomly oriented in the primary wall while in the inner wall of cell cavity they are nearly vertical to the long axis of fibers , which is similar to the arrangement of CMF in the corresponding layer of wood fibers. Meanwhile, the highly oriented arrangement of CMF is also observed in a certain layer of bamboo fibers, though it is incapable of determining which layer it is in this study. The pilot investigation demonstrates that AFM is a powerful tool for the high-resolution observation of CMF in bamboo fibers, meanwhile it has the advantages of simple procedure of sample preparation and easy operation compared to the traditional transmission electron microscopy.
文摘In order to research the effect of preservative penetrability, CuAz (copper azole) was used for the preservative, and pieces of Moso bamboo (Phyllostachys pubescens) were used for the experimental materials in this study. The vacuum pressure process was used to treat bamboo pieces. The results showed as follows: 1) Main treatment factors were preservative concentration and applied pressure; 2) In the same technology, both the retention and the weight proportion gain of the samples without node were less than those of ones with node, due to special structure of bamboo node; 3) For the samples without node, a good result could be gotten when the preservative concentration was from 1% to 2%, treatment pressure was 0.6 MPa, and treatment time was 30 min. And for the bamboo samples with node, a good result can be gotten when the concentration was 2%, treatment pressure was 0.4 MPa, and treatment time was 30 min. This study demonstrates that the interaction between preservative and bamboo can be improved by adjusting the parameters.
基金National Forestry Key Technology Program during the 11th Five-Year Plan Period (2006BAD19B0404).
文摘Blocks of Moso bamboo were used as experimental materials to test the toxicity of CuAz preservative on decay fungi by the lab test in this paper. The result showed that the natural decay resistance of 4-year-old Mao bamboo is moderate, and the resistance to brown fungi is stronger than that to white fungi. The anti-fungi properties of CuAz preservative at the retention of 3.3 kg/m3 are equal to those of CCA-C and ACQ-B at the retention of about 4.0 kg/m3 , and obviously superior to those of organic acids preservatives.
基金supported by the National 11th-five Year Plan (under code 2006BAD19B0405)the national project for publicbenefit (under code 2005DIB5J143)
文摘The field trial of Moso bamboo treated with 9 copper preservatives was conducted in Guangzhou, China. The result showed that two formulations of ammonia-based copper azole (F17 and F18 ) and a formulation of amine copper added with boron (F10), as well as 2 kinds of ammonia-based ACQ, at the copper retention of 3.2 kg/m3 or over, were very resistant to decay and termites after the 5- year field test. And the durability of ACQ-B treated Moso bamboo was similar to that of treated Masson pine and slash pine at the same copper level.
