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In order to assess the change of triploid populus tomentoza pulp plantation long-term-site productivity, The paper studied on effects of aboveground litterfall, fine root turnover and wet dust precipitation in nutrient cycling of triploid populus tomentoza pulp plantations at different ages,namely 2a、4a、5a、6a.It studied influence of different factors on decomposition of leaf、tree bark and twig of triploid populus tomentoza to select the operations to accelerate the decomposition and nutrient release. Finally, it studied influence of different intercrops on plantation site productivity and the relationship of intercrops and triploid populus tomentoza to select suitable intercrops. The main results as follows:(1)The aboveground litterfall of triploid populus tomentoza increased along with age from 216.03±59.7gm~(-2) at 3a to 482.38±101.3gm~(-2) at 7a, The N returned by litterfall wasl8.38±2.46kg.hm~(-2)a~-121.63±2.25kg.hm~(-2a~-139.51±4.61kg.hm~(-2a~-138.89±4.89kg.hm~(-2a~(-1) at 3a、5a、6a、7a respectively. The P returned by litterfall was 5.80±0.62kg.hm~(-2)a~(-1)、8.16±0.94kg.hm~(-2)a~(-1), 11.31±1.33kg.hm~(-2)a~(-1)、11.76±1.37kg.hm~(-2)a~(-1) at 3a、5a、6a、7a respectively. The nutrient returned by fine root turnover increased along with age, too. The N returned by fine root turnover was 3.85±0.41kghm~(-2)a~(-1)、5.22±0.63kghm~(-2)a~(-1),7.62±0.89kghm~(-2)a~(-1),9.17±1.22kghm~(-2)a~(-1) at 3a、5a、6a、7a respectively. The P returned by fine root turnover was 0.73±0.07kghm~(-2)a~(-1)、1.69±0.09kghm~(-2) a~(-1)、1.92±0.31kghm~(-2)a~(-1)、1.96±0.21kghm~(-2)a~(-1) at 3a、5a、6a、7a respectively. The leaf was the principal pathway to return nutrient to soil among litterfall, fine root turnover and wet dust precipitation. The proportion of returned N by leaf was 74.84%、71.96%、78.58%、75.03% at 3a、5a、6a、7a respectively,The proportion of returned P by leaf was 85.93%、80.31%、83.04%、83.23% at 3a、5a、6a、7a respectively. Therefore, it is important to protect and utilize the leaf in order to maintenance and enhance the long-term-site productivity of triploid populus tomentoza pulp plantation.

本文采取时序研究法，以3a、5a、6a、7a共4个不同年龄的三倍体毛白杨纸浆林为对象，研究了地上凋落物、细根周转、湿沉降在林分N、P营养元素循环中的作用及不同年龄林分N、P营养元素循环的特征，以评价三倍体毛白杨纸浆林长期立地生产力的变化；采取网袋法研究了不同因素对落叶、树皮、树枝分解的影响，以确定加快其分解、促进养分释放的措施：同时研究了不同间作物对林地影响、林木与间作物之间关系，以选择能维持立地生产力的合适的间作物种类等内容，得到以下结论：(1)随着年龄的增加，三倍体毛白杨地上凋落物的数量从3a的216.03±59.7gm~(-2)增加到7a的482.38±101.3gm~(-2)，通过凋落物归还的N分别为：3a时为18.38±2.46kg.hm~(-2)a~(-1)，5a时为21.63±2.25kg.hm~(-2)a~(-1)，6a时为39.51±4.61kg.hm~(-2)a~(-1)，7a时为38.89±4.89kg.hm~(-2)a~(-1)，归还的P分别为：3a时为5.80±0.62kg.hm~(-2)a~(-1)，5a时为8.16±0.94kg.hm~(-2)a~(-1)，6a时为11.31±1.33kg.hm~(-2)a~(-1)，7a时为11.76±1.37kg.hm~(-2)a~-1随着年龄的增加，通过细根周转归还的养分也在增加，归还的N分别为：3a时3.85±0.41kghm~(-2a~(-1)，5a时5.22±0.63kghm~(-2)a~(-1)，6a时7.62±0.89kghm~(-2)a~(-1)，7a时9.17±1.22kghm~(-2)a~-1归还的P分别为：3a时0.73±0.07kghm~(-2a~(-1)，5a时1.69±0.09kghm~(-2)a~(-1)，6a时1.92±0.31kghm~(-2)a~(-1)，7a时1.96±0.21kghm~(-2)a~-1从地上凋落物、细根周转、湿沉降三种不同途径归还林地养分所占的比例来看，地上凋落物中的落叶是归还养分主要途径，年龄在3a、5a、6a、7a时，通过落叶归还的N所占比例分别为74.84%、71.96%、78.58%和75.03%，归还的P所占比例分别为85.93%、80.31%、83.04%和83.23%。

The factory has more than 30 years history of mechanical processing, export-oriented products to cut, punching, bending, and other equipment-based, all exports to the U.S., Europe and Southeast Asian countries, the export volume of 28 million yuan; domestic product to paper machinery The main equipment, main products are: GDJ, GSJ series of single, double helix squeeze pulp (Patent No.: 200420038401.8), heat dispersion systems, waste treatment systems, sludge treatment system, a new type of drum-type washing with pulp, high-speed Pulp washing machine, a new network of small grille, the pressure drum sieve, and so on.

本厂有三十多年机械加工历史，出口型产品主要以剪切、冲压、折弯等设备为主，全部出口到美国、欧洲及东南亚各国，年出口额2800万元；内销型产品以造纸机械设备为主，主要产品有：GDJ、GSJ系列单、双螺旋挤浆机（专利号：200420038401.8）、热分散系统、废纸处理系统、污泥处理系统、新型转鼓带式洗浆机、高速洗浆机、新型网式细格栅、压力筛鼓等。

Loofa obtained from traditional market was cut into approximate 1 cm in length and then treated with 1 N sodium hydroxide at 85 oC for 4 hours. The pulp like suspension was bleached by 25 % sodium hypochloride until the fiber turned colorless and the pulp was washed by distilled water to remove excess hypochlorite. The white pulp was again filtered and lyophilized to make into a paper-like membrane.

将购自传统市场之菜瓜布，裁剪出大约1公分长之纤维，再於浓度1 N的氢氧化钠之溶液加热至85 ℃处理4小时，以25 %之漂白水将此纸浆状之悬浮液漂白，使其纤维褪色后再以蒸馏水清洗以去除次氯酸盐，最后将此白色悬浮液过滤及冷冻乾燥，制成纸状的薄膜。

The influence of the technological parameters in mild chemical pretreatment process of OCC pulp on the pulp quality was discussed, and the beatability of OCC pulp with suitable chemical pretreatment was also researched in laboratory.

通过对OCC纸浆采用轻度化学预处理时相关工艺参数对浆张物理强度性能影响的研究，得出了适宜的预处理工艺参数，进一步研究了化学预处理过程对OCC纸浆的打浆性能和保水性能的影响。

1 Filling amount: 30 tons of bamboo counted with liquor filled tank and circularly press the bamboo flakes for 3-4 minutes during boiling,(the data results from repeated experiments), if the filling amount is too less, the hardness is low, too much alkali remnant, and the pulp yield will be low; if the filling amount is too much, the cooking liquor can not be dried completed, and the circulation amount is too less, the electric current of circulating pump is too low, it will be difficult to cook, and there will be too much pulp knots with high hardness and less alkali remnant which may lead to unripe pulp.

3.1.1装锅量：竹子30吨是以液浸装锅和开中循环压竹片3——4分钟为计，（数据是根据多次实验得出的结果）如装锅量太小，硬度低，残碱大，浆得率低，装锅量太大蒸煮液无法完全送完，循环量小，循环泵电流小，蒸煮困难，浆节子多、硬度高、残碱小，有可能造成生浆。

The company set up technology development research centre, adhere to scientific and technological innovation as the basis, to user needs as the goal, to introduce and absorb domestic and international pulp, paper, paper processing technology to China and imports mainly supported by some high-quality wood pulp Reed Pulp for raw materials, continued technological innovation and product development, the maximum to meet user needs.

公司成立的技术开发研究中心，坚持以科技创新为依托，以用户需要为目标，全力引进和吸收国内外制浆、造纸、纸品加工技术，以进口和国产优质木浆为主辅以部分苇浆为原材料，不断技术创新和产品开发，最大限度地满足用户需要。

Replacing wood pulp with corn stem pulp and waste paper, our products have better quality and more categories as well as more functions than the wholly-wooden pulp products.

该项目采用发明专利技术改造传统造纸技术，利用商品秸草浆或废纸替代木浆，生产比全木浆产品品质更高，品种更多，用途更广的经纬线生活纸，项目建设期一年。

Paper-making process changes such as change of pulp network speed ratio (pulp network speed ratio refers to the flow speed and screen flow velocity ratio), pulp filler for the change, the proportion of the changes will affect the internal structure of the paper.

造纸工艺的改变如浆网速比的改变(浆网速比是指浆流速量与网流速量之比)、浆种的改变、加添料比例的改变，城市感化纸弛的本质布局。

Main products: honey citron tea, and other series slurry nectar; concentrated orange drink beverages concentrated pulp series pulp; non-concentrated orange juice and other non-family fruit and vegetable juice concentrate; concentrated orange juice and other fruit and vegetable juice concentrate series, and chilled grapefruit pulp , Citrus essential oils, wine and other products.

公司主要产品：蜂蜜柚子茶等系列浆态果茶；橙饮料浓浆等系列饮料浓浆；非浓橙汁等系列非浓缩果蔬汁；浓缩橙汁等系列浓缩果蔬汁；以及冷冻柚子果肉、柑橘香精油、果酒等产品。

Wood pulp project in Zhanjiang, Guangdong is approved by the State Council by the National Development and Reform Commission approved a large-scale pulp project, which was originally scheduled by domestic companies and foreign joint venture construction of a paper, the original plan a total investment of 9.4 billion project to build the size of annual production capacity of bleached sulphate pulp 700,000 tons, raw material forest base of 300 million mu, after foreign investors exit, the National Development and Reform Commission decided to re-select the new owners.

木材纸浆项目在湛江，广东批准由国家发展和改革委员会，国务院批准的大型纸浆项目，该项目最初是由本国公司和外国的一纸合资建设的计划，原计划1 9.4亿美元的项目，以建立的漂白硫酸盐木浆七十点〇〇〇万吨，原料300万亩林基地后，外国投资者的退出，年生产能力，总投资规模，国家发展和改革委员会决定重新选择新业主。

"Second Life is remarkably easy to work with, and is very popular,"

"第二次生命是显着容易的工作，并且很受欢迎，"

For example, we usually assume that materials are homogeneous and isotropic and free of internal defects or flaws.

为了得到适合有限元分析的模型，我们必须经过如图2所示的简化步骤。