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净生产力
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  net productivity
     the annual average net productivity of 4 years old and 13 years old plantations were 8.76 t/hm~(2)·a and 26.52 t/hm~(2)·a respectively.
     西南桦年平均净生产力4年生为8.76 t/hm2.a,13年生为26.52 t/hm2.a。
短句来源
     Results show that the biomass and the net productivity of this stand are 114.613? t/hm~2 and 12.917? t/hm~2·a respectively.
     结果表明,该林区的生物量为114 613t/hm2,净生产力为12 917t/hm2·a;
短句来源
     hm -2 ·a -1 individually at 22 year. Stand (stem)biomass and net productivity of 12,16 site index are 173.7(111.9),233.9(158.8)t. hm -2 and 9.19(3.73),11.92(5.29)t.
     30年 12、16指数级的林分 (树干 )生物量分别为 :173 7( 111 9)、2 33 9( 158 8)t·hm- 2 ,净生产力为 :9 19( 3 73)、11 92 ( 5 2 9)t·hm- 2 ·a- 1。
短句来源
     The annual net productivity of P.elliottii trees was 7.61×103 kg·hm-2·a-1 and annual carbon storage was up to 4.54×103 kg·hm-2·a-1.
     根据以上数据,得出湿地松林年净生产力约为7.61×103kg/hm2.a,有机碳年净固定量(C)为4.54×103kg/hm2.a。
短句来源
     The net productivity of the oak forests is 18701.3kg/hm~2·ɑ for filbert oak forest,7682.6kg/hm~2·ɑ for oak coppice,7622.1kg/hm~2·ɑ for rhododendron oak forest,7588.5kg/hm~2·ɑ for lespedeza oak forest,6984.0kg/hm~2·ɑ for high production oak forest.
     各林分净生产力依次为榛子蒙古栎林(18701.3kg/hm2.a)>矮栎林(7682.6kg/hm2.a)>杜鹃蒙古栎林(7622.1kg/hm2.a)>胡枝子蒙古栎林(7588.5kg/hm2.a)>高产栎林(6984.0kg/hm2.a)。
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  net primary productivity
     the annual average net primary productivity of 4 years old and 13 years old plantations were 2.67 t/hm~(2)·a and 5.45 t/hm~(2)·a respectively.
     净生产力4年生为2.67 t/hm2.a,13年生为5.45 t/hm2.a;
短句来源
     The net primary productivity(NPP) of the trees was (11.1±1.7)t/(hm~2·a),and the annual amount of litterfall was (2.3±0.3)t/(hm~2·a). The annual total carbon dioxide efflux measured in situ with a closed chamber method was (5.5±0.2)t/(hm~2·a).
     10年生时林木碳的净生产力为(11.1±1.7)t/(hm2·a),凋落物归还量为(2.3±0.3)t/(hm2·a),土壤CO2释放量为(5.5±0.2)t/(hm2·a)。
短句来源
     Biomass of 5 and 6 years old plantations were 65.0 and 77.3 t/hm 2. Net primary productivity of the plantation from 5 to 6 years old was 19.9 t/hm 2. N accumulation by tree component,understorey and litter on forest floor was 525.45 kg/hm 2 at the age of 5 years and 590.24 kg/hm 2 at the age of 6 years.
     5~6年生马占相思地上部分净生产力为19.9t/hm2。 5年生和6年生时,树木地上部分、林下植物和地表凋落物的N总积累量分别为525.45kg/hm2和590.24kg/hm2。
短句来源
     At 18 years old,the root system biomass and net primary productivity of the mixed forest are 22. 23t/hm2 and 1.24 t/hm2·a respectivily,which are 1. 15 times as much as those of the pure forest The storage of nitrogen in root pool is 71.04 kg/hm2,i. e. 1.55times as that of the pure cypress forest.
     18龄桤柏混交林根系生物量为22.23t/hm2,净生产力为1.24t/hm2·a为柏木纯林的1.5倍,根加氮贮量在混交林中为71.04kg/hm2,是纯林49.45kg/hm2的1.55倍。
短句来源
     The net productivity of fine roots in both stands totaled to 4 124 and 3 528? t·hm -2 a -1 , accounted for 22 9% and 20 9% of total net primary productivity of community, respectively.
     细根净生产力分别为 4 12 4和 3 5 2 8t·hm- 2 a- 1 ,分别占各自群落净第一性生产力的 2 2 9%和2 0 9% ;
短句来源
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  net production
     The average relative growth rate of biomass was 0.1238.The biomass and the net production of shrub layer and herb layer were 0.79% and 0.37%,5.82% and 4.87% of the total ones,respectively.
     灌木层、草本层的生物量和净生产力分别占总的 0 .79%和 0 .3 7%、5 .82 %和 4 .87%。
短句来源
     The litter was 11.23t/hm 2,which was 7.95% of the total biomass; the yearly litter was 3.37t/(hm 2·a),which was 45.60% of the total net production.
     凋落物层现存量为 1 1 .2 3 t/ (hm2 · a) ,占总生物量的7.95 %,年凋落物量 3 .3 7t/ (hm2 · a) ,占总净生产力的 4 5 .60 %。
短句来源
     Studies on biomass and net production of Quercus acutidentata forest in Baotianman Nature Reserve
     内乡宝天曼自然保护区锐齿栎林生物量和净生产力研究
短句来源
     By comparing with other community types, the secondary shrub thicket and shrub-grassland have lower biomass, and are less efficient to use the abundant natural resources of heat and water in subtropical zone. The following regression equation was derived from the correlation of aboveground biomass(X) and net production(Y): Y = 3.88 + 0.14X, and net production incresed with biomass.
     所调查的5个群落类型的地上部分生物量和生产力可回归成线性方程Y=3.88+0.14X,净生产力随生物量的增加而提高。
短句来源
  “净生产力”译为未确定词的双语例句
     The net productive forces was 7.171 t/hm 2·a.
     林分净生产力为 7.171t/hm2 ·a。
短句来源
     42.57t/hm2 to 57.42t/hm2, the productivity is from 12.16t/bm2a to 16.4111hm2a.
     3.5年生巨桉的生物产量从42.57t/hm~2-57.42t/hm~2,平均净生产力从12.16t/hm~2·a-16.41t/hm~2·a。 巨桉生物产量随年龄的增大而增加,3.5年内是处于速生丰产时期。
短句来源
     The stand productivities of the three communities (HI, II, I) were 7.719,6.495 and 0.961t/hm2.a, respectively.
     植物群落净生产力较低,措施Ⅲ7.719t/hm~2·a,措施Ⅱ6.495t/hm~2·a,措施Ⅰ0.961t/hm~2·a。
短句来源
     The net primary productions of periphyton and macrophyte were 0.30 kJ/(m~2·d) and (1.95 kJ/(m~2·d))respectively.
     附生藻类的净生产力为0 30kJ (m2·d)。 大型水生植物的净生产力为1 95kJ (m2·d)。
短句来源
     The fine root production in the mixed forest was up to 4.124 t hm -2 a -1 , 16.9% higher than that in the pure stand.
     混交林细根的年净生产力达 4 .12 4thm-2 a-1,比纯林高出 16 .9% .
短句来源
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  net productivity
The estimated total mean biomass for dahurian larch plantation communities of four structure types was 159.445 t/hm2 and the net productivity was 12.237 t/hm2.a.
      
Biomass and net productivity for spruce plantation
      
The result showed that the biomass of stand was 151 t/hm-2 and net productivity was 11~14 t/(hm2·a).
      
The distribution and net productivity of sublittoral populations of attached macrophytic algae in an estuary on the Atlantic coa
      
A short term study was made on the ecology and the net productivity of sublittoral populations of benthic macrophytes in, and near, the Ria de Aldan on the Atlantic coast of Spain.
      
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  net primary productivity
As a proxy of the vegetation growing process, NDVI difference represents net primary productivity of vegetation at a certain time interval under an environment controlled by certain climatic conditions and other factors.
      
Net primary productivity of photosynthesis (NPP) and the proportionality coefficient between respiratory decarboxylation and carbon reserves in wood were calculated.
      
Accurately estimating forest net primary productivity (NPP) plays an important role in study of global carbon budget.
      
Spatio-temporal distribution of net primary productivity along the Northeast China Transect and its response to climatic change
      
An improved Carnegie Ames Stanford Approach model (CASA model) was used to estimate the net primary productivity (NPP) of the Northeast China Transect (NECT) every month from 1982 to 2000.
      
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  net production
Accordingly, the refined estimate for net production in the vegetation ecosystem of Northern Eurasia approaches 1.3 Gt C/year.
      
Activation energies were determined under steady state conditions for the net production of cyclohexanone and cyclohexanol and for cyclohexane and oxygen net consumption.
      
Forest plays very important roles in global system with about 35% land area producing about 70% of total land net production.
      
Gd3+ (0.3 mM) failed to affect effluent radioactivity from islets prelabeled with myo-[2-3H]inositol and cyclic AMP net production in islets incubated in the absence or presence of forskolin.
      
Total organic carbon input from the Herbert River and from net production of mangroves, phytoplankton, seagrasses, and benthic microalgae is 8.94 ×109?M Corg?yr-1 (moles organic carbon per year).
      
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Rubber plantations in Hainan Island can be regarded as an artificial ecological system with multistratification structures, which is consisted of"windbreak forest-rubber tree/ interplanted with tropical crops-natural or artificial ground

海南岛橡胶园是由“防护林—橡胶林(或间种热带作物)—地面人工或天然覆盖”多层复合的人工生态系统。由于太阳能量丰富(净辐射量大),胶林净生产力高。胶林的净收入热量,主要消耗于蒸散耗热,其次是湍流热交换;胶林内得到的净辐射量较小,湍流交换微弱,土壤热通量也不大。林内温度变化和缓、湿润、静风,橡胶人工林生态群落具有森林小气候生态环境的基本特征,其小气候效应类似于热带季雨林(次生林)。

The Chinese arborvitae, as an important species of silvicultural tree, is a kind of evergreen coniferous tree widely distributed in the northern part of China. It can even grow in the crevices of limestone due to its ability to endure poor soil and dry habitat. Natural secondary forests or cultivated trees are widely distributed on sunny and half-sunny slopes of mountains in the district of Beijing at elevations of 200-—900m.

天然侧柏林的种类组成以菊科、禾本科植物最多,豆科、百合科、蔷薇科植物次之。组成天然侧柏林植物生活型,以地面芽和高位芽植物所占比例较大,地下芽植物次之,一年生植物的比例略高于地上芽植物。31年生人工侧柏林以胸径4—5cm、树高3—4m的植株数量最多。侧柏的胸径、树高与茎重、枝条重、叶重、根系重之间具显著相关。以胸径为自变量、树木各部分干重为应变量所获得的优化模型为:茎重(W_8)=169.82D~(1.92)(P<0.001),枝条重(W_(Br))=28.64D~(2.41),(P<0.01),叶重(W_L)=10D~(2.82)(P<0.001),根系重(W_R)=e~(4.99+0.387D)(P<0.001)。由此估算得侧柏林的各器官干重:茎15.56,枝条为6.57,叶5.16,根5.29吨/公顷。乔木层的总生物量为32.58吨/公顷。林下灌木和草本层在生长季中变化明显,9月的总生物量为7.17吨/公顷。人工侧柏林总生物量为39.75吨/公顷,年平均净生产力为1.28吨/公顷。

The paper is a reseach of plant biomass and production of 27 -age artificial forest of Larix omelini( Rupr ) Rupr. ( L. dahurica ) at elevation of 800 min Greater Khingan mauntains . The following regression equations were derived from the standing crop of the destructive trees :Ws=0. 0437( D2 H ) 0.9781Wba=0. 0593< D2 H )0.4197Wl=0. 0317( D2 H )0.4017Wbr=0. 08813 ( D2 H )0.2237Wr =0. 0688( D2 H )0. 7917The estimated total biomass of L. dahurica forest community is 121.36 t/ha, net production is 4.4995 t/( ha.yr...

The paper is a reseach of plant biomass and production of 27 -age artificial forest of Larix omelini( Rupr ) Rupr. ( L. dahurica ) at elevation of 800 min Greater Khingan mauntains . The following regression equations were derived from the standing crop of the destructive trees :Ws=0. 0437( D2 H ) 0.9781Wba=0. 0593< D2 H )0.4197Wl=0. 0317( D2 H )0.4017Wbr=0. 08813 ( D2 H )0.2237Wr =0. 0688( D2 H )0. 7917The estimated total biomass of L. dahurica forest community is 121.36 t/ha, net production is 4.4995 t/( ha.yr ) .

本文对内蒙呼盟地区海拔88—1200m的兴安落叶松(Larix gmelini [Rupr.]Rupr.)27年生人工人林分生物量和生产力进行测定的研究.由于人工林的林分单一,下木和草木植物相对数量低于1%,所以根据调查资料,只建立了估测兴安落叶松各器官生物量的回归方程,方程的相关系数和估测的精度均较高,具有理论和实践方面的价值.结果表明:兴安落叶松林总生物量约在121.36吨/公顷,净生产力为4.495吨/公顷.年左右.

 
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