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林网     
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  forest network
     three farm-shelter forest network wind protection efficiency order for : 130m×300m’s network>260m×300m’s network>300m×400m’s network.
     三种网格的农田防护林防风效能的大小顺序为:130m×300m林网>260m×300m林网>300m×400m林网
短句来源
     Under the protection of the network ,the output of crops increase by 5.14% and total increase has reached 468 kg/ha and 655.2 yuan/ha. The increasing rate of the output is 50 ~100% comparing with that of the farmland without forest network.
     在林网保护下,作物产量提高5.14%,玉米纯增产量468km/hm~2.纯增产值655.2元/hm~2,与无林网农田相比,增产效果显著,平均提高了50%~100%。
短句来源
     Determination on protective effectiveness of the forest network in farmland in theshoal experimental farm of Shangyu showed that, wind broken effectiveness of the forest beltwith narrow ventilating structure was up to 31. 0% or so.
     对上虞市海涂实验农场农田林网防护效益的测定,结果表明通风结构审林带防风效能达到31.0%左右;
短句来源
     The windbreak degree of a single farmland wind break forest network is 28 2%.
     单个农田林网的防风度为28.2%,而大面积连片农田防护林体系的建成,区域性防风效应更加显著。
短句来源
     In high -- temperature and dry seasonsof Auguest and September, the relative humility in the forest network increased by 1. 8%.
     在八九月份高温干旱季节,林网内增加相对湿度约1.8%。
短句来源
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  shelterbelt forest
     Based on the investigation of the biomass,productivity,and production structure of poplar in the farmland shelterbelt forest,the growth relationship of Populus to-mentosa and Populus daquansis has been established.
     本文研究了农田林网杨树的生物量、生产力和产量结构,建立了毛白杨和大官杨的相对生长关系。
短句来源
     The relative growth equation of the two kinds of poplar, W= aDb, was fit at close correlation and high precision. It could be used to estimate the biomass of the tress in the farmland shelterbelt forest where poplar was dominant at present.
     依据W=aD~b拟合的两种杨树的相对生长方程相关程度好,精度高,可以用来估测当前以杨树为主的农田林网林木生物量。
短句来源
  forest net
     Within the whole forest net, the unginned cotton yield is increased by 29.9%, and the gined one by 35.06%.
     整个林网内的籽棉产量增加 2 9 94% ,皮棉产量增加 35 0 6% .
短句来源
     The evaporation in forest net was decreased by 15-22%.
     8年生草牧场防护林带20H范围内平均降低风速31-43%,林网内蒸发量减少15-22%。
短句来源
     This paper deals with the thinking of raising the ecological benefit and economic benefit of forestresources in sandy areas starting from the improvernent of forest net structure.forest type structure,treespecies structure and forest age structure.
     当前沙区森林资源存在林种单纯、树种单一、林龄结构不均衡等问题,本文从改善林网结构、林种结构、树种结构、林龄结构着手论述提高沙区森林资源的生态效益与经济效益的思路。
短句来源
     The stimulation resultsalter the present situation,increasing afforestation area, regulating forest composition andoptimizing forest net structure and tree species,finally,realizing the purposes of resourcesstructure being optimized and ecological and economic benefits being brought into fullplay。
     根据模型优化结果扩大造林面积,调整林种比例,进行林网结构优化及树种优化等,结果使资源结构优化,生态效益和经济效益充分发挥。
短句来源
     Populus cathayana is the main species to plant farmland forest net work in Qinghai province hill .
     青杨是青海省营造山地农田林网的主要树种。
短句来源
更多       
  shelterbelt net
     Within the shelterbelt net, the area with more than 10% efficiency of omnibearing wind check was determined as benefited area.
     在林网内,全方位防风效能大于10%的区域为防护效益区。
短句来源
     The analysis of yield and quality of crops indicated that the sheltering range of shelterbelt net was 25 times tree height.
     作物产量和质量分析表明,林网的防护范围为25倍树高。
短句来源

 

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      forest network
    For the landscape structure of forest network after regenerating or reconstruction, the grid number of closed network should be 13 per km2 and the minimum number of belts should be 34 per km2.
          
    Any opinions expressed do not necessarily reflect the views of the Canadian Forest Service or the Canadian Model Forest Network.
          
    Canada launched an International Model Forest Network based on the success of its national program.
          
      forest net
    Accurately estimating forest net primary productivity (NPP) plays an important role in study of global carbon budget.
          
    Rates of accumulation, transformation and availability of sediment nitrogen in four mangrove forests of different age and type in southern Thailand were examined in relation to forest net canopy production.
          
    Recent analysis in experiments with elevated CO2 concentrations have shown increases of the forest net primary productivity by about 23%, and, in the case of poplars, an increase of the standing root biomass by about 62%.
          
    Data flow for spatial pattern analysis of forest net primary productivity in China.
          
      shelterbelt net
    Study on specifications of farmland shelterbelt net in Northeastern Plain of China
          
    The functions of shelterbelt net in omnibearing wind check and prevention of frostbite as well as the field of integrated climate effect within shelterbelt net were analyzed, through located observation of meteorological factors.
          
    Within the shelterbelt net, the area with more than 10% efficiency of omnibearing wind check was determined as benefited area.
          
    The analysis of yield and quality of crops indicated that the sheltering range of shelterbelt net was 25 times tree height.
          
    Based on the comprehensive analysis above, the suitable size of farmland shelterbelt net in Northeastern Plain of China was decided to be 400 m×400 m.
          


    The effectiveness of different patterns of shelterbelt in the Pearl River Delta was investigeted and a mathematical model of protective effect for the different types of structures of the shelterbelt,based on statistics by extracting 202 random data, has been constructed. viz; ( y = 0.19094a + 27.53397 T +1.36578 L + 1.84616V -18.89249) . An investidation was carried out into the inner relations between the factors of the shelterbelt structure and protective effect by means of integrated analysis. In the meantime,the...

    The effectiveness of different patterns of shelterbelt in the Pearl River Delta was investigeted and a mathematical model of protective effect for the different types of structures of the shelterbelt,based on statistics by extracting 202 random data, has been constructed. viz; ( y = 0.19094a + 27.53397 T +1.36578 L + 1.84616V -18.89249) . An investidation was carried out into the inner relations between the factors of the shelterbelt structure and protective effect by means of integrated analysis. In the meantime,the relations between the adjustment of the shelterbelt structure and the protective effect were studied. The results showed that the windbreak effect within the network of shelterbelt depends mainly on the penetrability of the shelterbelts,the index of wind-resistance of different tree species, width of the shelterbelts, wind-speed and wind direction. It is shown that adjusting the belt structure is of great immediate significance to agricultural production.

    本文调查了不同林带结构的防风效应。应用数理统计的方法,随机抽取202个数据,建立一个林带结构防风效应的数学模式, 即:Y=0.19094α+27.53397T+1.36578L+1.84616V-18.89249,以综合分析的手段,探讨林带结构因子与防风效应的内在关系。同时,也进行了调节林带结构与防风效应关系的研究。结果表明,林网内的防风效应主要取决于林带的疏透度,与林带树种防风特性指标、林带宽度、风速和风向也有密切关系;人工调节林带结构的措施在农业生产上具有重大意义。

    A survey was made of the accumulated wind damage suffered by over 370, 000 rubber trees belonging to clones PR107 and Haiken 1 in 1111 stands covering an area of about 736.7 ha in 10 state farms in southern Leizhou Peninsula, Guangdong Province. Analysis of the data obtained gives the following indications: 1. The survival rate of rubber trees increases progressively as the distance between their location and the coast widens because typhoons come on shore mainly from the east or southeast. The survival rate...

    A survey was made of the accumulated wind damage suffered by over 370, 000 rubber trees belonging to clones PR107 and Haiken 1 in 1111 stands covering an area of about 736.7 ha in 10 state farms in southern Leizhou Peninsula, Guangdong Province. Analysis of the data obtained gives the following indications: 1. The survival rate of rubber trees increases progressively as the distance between their location and the coast widens because typhoons come on shore mainly from the east or southeast. The survival rate goes up 4—8% for each 10 km extending westward or northwestward from the van windbreak nearly 10 km away from the coast. Accoraingly, the rubber-growing areas can be divided into 3 groups in reference to their survival rates, viz. areas with survival rates lower than 50%, areas with survival rates of 50—60%, and areas with survival rates higher than 60%. 2. The windbreak has authentically offered a protective effect against wind damage. Under the shelter of an incomplete windbreak at the windward side, the accumulated suvival rate of rubber trees is about 20% lower than that in the case of acomplete windbreak. With the shelter by 5—6 successive incomplete windbreaks, 400—600m westward from the van windbreak, the survival rate of rubber trees increased to a level comparable to that in the case of a complete windbreak. 3. The survival rate of rubber trees varies with macro-topographic changes, the highest survival rate being on the westward slope. Micro-topographic changes lead to no regularity in the survival rates of rubber trees on eastward or westward slope. However, wind damage was found to be more serious at a limited locality near the slopetransition line on the windward slope, 4. Based on the accumulated'survival rates and many years' pertree yields recorded by the state farms concerned, rubber-growing areas can be divided into 4 types in terms of their annual yields, viz. areas with<450 kg/ha, areas with 450—750 kg/ha, areas with 750—1050 kg/ha, and areas with>1050 kg/ha, Furthermore, the paper presents a deep analysis of the economic benefit of land use and crop allocation.

    本题通过对徐海植胶区PR107和海垦1两个抗风品系的累计风害状况的调查,分析它与台风来向、台风登陆后所经历的距离,林网及地形等因子与风害大小的规律性。先后共调查10个橡胶农场、1111个林段、11051.7亩共37万余株胶树。研究结果表明: 1.由于台风主要来自东面及东南面,橡胶树的保存率随距东海岸线及东南海岸线的远近而增减。自农场林网范围(此处距海岸线10公里左右)开始计算,向西或西北每延伸10公里,保存率可提高4~8%。据此,可以把该植胶区划分为:胶树累计保存率<50%;50~60%;>60%的三个亚类型区。 2.肯定了防护林网对防台风所起的效应,在迎风面林带中断时,风害累计损失率要比林带连续时的损失率高200%左右;但在连续经过5~6道林带,即400~600米范围,胶树的保存率即可提高到与林带连续时的情况下相类似。 3.大范围的地形变化影响胶树保存率,以西向坡面保存率最高。小地形的变化,东西坡面的胶树保存率无规律性,但在迎风坡面的变坡线附近的局部地段,风害率均显著加重。 4.根据累计保存率的多少与各场多年的单株产量记录,初步划分了四个等级的产量区,即亩产<30公斤;3...

    本题通过对徐海植胶区PR107和海垦1两个抗风品系的累计风害状况的调查,分析它与台风来向、台风登陆后所经历的距离,林网及地形等因子与风害大小的规律性。先后共调查10个橡胶农场、1111个林段、11051.7亩共37万余株胶树。研究结果表明: 1.由于台风主要来自东面及东南面,橡胶树的保存率随距东海岸线及东南海岸线的远近而增减。自农场林网范围(此处距海岸线10公里左右)开始计算,向西或西北每延伸10公里,保存率可提高4~8%。据此,可以把该植胶区划分为:胶树累计保存率<50%;50~60%;>60%的三个亚类型区。 2.肯定了防护林网对防台风所起的效应,在迎风面林带中断时,风害累计损失率要比林带连续时的损失率高200%左右;但在连续经过5~6道林带,即400~600米范围,胶树的保存率即可提高到与林带连续时的情况下相类似。 3.大范围的地形变化影响胶树保存率,以西向坡面保存率最高。小地形的变化,东西坡面的胶树保存率无规律性,但在迎风坡面的变坡线附近的局部地段,风害率均显著加重。 4.根据累计保存率的多少与各场多年的单株产量记录,初步划分了四个等级的产量区,即亩产<30公斤;30~50公斤; 50~70公斤;>70公斤。本文根据胶树累计保存率和单位面积产量的高低;林带中断与否的状况;大小地形影响等综合因素,为进一步划分农场内土地利用经济效益的分析、合理安排作物布局提供了科学依据。

    This paper deals with the solar radition conditions of a shelterbelt network. Through a comparing of direct radiation, diffuse radiation, reflected radiation, gross radiation, net radiation and photosyntheti cally active radiation between sheltered and exposed conditions, discovered that even though the gross radiation was reduced in the network, sheltered ground had a increase in net radiation and photosynthetically active radiation. So shelterbelt network can make a increase of energy input of this ecosystem....

    This paper deals with the solar radition conditions of a shelterbelt network. Through a comparing of direct radiation, diffuse radiation, reflected radiation, gross radiation, net radiation and photosyntheti cally active radiation between sheltered and exposed conditions, discovered that even though the gross radiation was reduced in the network, sheltered ground had a increase in net radiation and photosynthetically active radiation. So shelterbelt network can make a increase of energy input of this ecosystem.

    本文研究了农田林网的辐射状况,通过对林网内外直接辐射、散射辐射、反射辐射、总辐射、净辐射与光合有效辐射的比较,发现林网虽然减少了农田的总辐射,但可以增加净辐射和光合有效辐射,从而提高整个生态系统的能量输入.

     
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