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生产力单位
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  “生产力单位”译为未确定词的双语例句
     Based on the grain yield of Yuyang district from 1984 to 2003,the author chosen a suitable model to estimate net primary productivity of cultivated land of different region to research the relation between ecological environment and NPP of cultivated land.
     以榆林市榆阳区1984~2003年各乡镇的粮食产量统计数据为依据,选用了适合农用地的净第一性生产力估算模型,对该区耕地净第一性生产力单位面积量及总量进行分区动态测算,以揭示生态环境对耕地净第一性生产力的影响。
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     The result showed that the dry weight of plant and the weight of fruit per plant were increased by compound DTA-6+Mo,and the yield was improved.
     结果表明:显著提高单株生产力,单位面积产量均高于DTA_6、钼和清水处理;
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  相似匹配句对
     The productivity forces of the workers is the basic unit of productivity forces.
     劳动者的生产力生产力的基本单位
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     Creative productivity
     创意生产力
短句来源
     PRODUCTIVITY ENGINEERING
     生产力工程
短句来源
     Photosynthetic unit
     光合单位
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     The total productivity for stands was 504.84×10~4 t·a~(-1),with a mean productivity of 2.55 t·hm~(-2)·a~(-1).
     a-1,单位面积平均生产力为2.55 t.
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The secondary forest dominated by Castauopsis carlesii with artificial measures promoting regeneration (AMPR) and Cunninghamia lanceolata plantation (control) reforested on slash area of evergreen broad_leaved forest after 24 years was compared. The results showed that the species amount of tree, shrub stratum of AMPR was of 27,49 respectively, while that of the control was of 12,32. The tree species composition and structure of AMPR stand were more complex. The stand volume of AMPR was of 316.912 m3/hm2, but...

The secondary forest dominated by Castauopsis carlesii with artificial measures promoting regeneration (AMPR) and Cunninghamia lanceolata plantation (control) reforested on slash area of evergreen broad_leaved forest after 24 years was compared. The results showed that the species amount of tree, shrub stratum of AMPR was of 27,49 respectively, while that of the control was of 12,32. The tree species composition and structure of AMPR stand were more complex. The stand volume of AMPR was of 316.912 m3/hm2, but that of the control was of 283288 m3/hm2. In 0~20cm soil depth, the AMPR soil degree of aggregation, contents of >025mm waterstable aggregate increased by 317%, 565% respectively, while thebulk density, dispersion ratio, destroy rate of ped decreased by 1497%, 1194%, 501% each. The total porosity, non_capillary porosity increased by 712%, 175%;the ontents of organic matter increased by 7602 g/kg; the soil enzymes activity and soil respiration intensity were enhanced compared with the control. It revealed that the soil structure properties, the capability of containing and supplying fertility and soil biochemical action intensity of AMPR were improved obviously. All above indicated that AMPR is one of the good patterns, which could recover evergreen broad_leaved forest and maintained long_term site productivity.

通过对常绿阔叶林采伐迹地进行人工促进天然更新的以米槠为主的次生林 (人促落 )和营造杉木人工林 2 4a后的比较研究 ,结果显示 :人促群落乔木层组成树种为 2 7种 ,灌木层种类为 49种 ,而对照 (杉木人工林 )的则分别为12种、32种 ,人促群落树种组成和结构比对照的复杂。人促群落林分生产力 (单位面积蓄积加 316 912m2 /hm2 )亦比对照的 (单位面积蓄积量 2 83 2 88m3/hm2 )高。与对照的相比 ,人促群落 0cm~ 2 0cm土层土壤哮聚长、>0 2 5mm水稳性团聚体含量分别高 3 17%、5 6 5 % ,而分散系数、结构体破坏率分别低 11 94%、5 0 1% ;土壤总孔隙度和非毛管孔隙度分别高 7 12 %、1 75 % ;土壤容重低 14 97% ;有机质含量高 7 6 0 2g/kg;土壤酶活性较强 ,呼吸作用强度较大。这表明人促群落土壤结构性能、土壤保肥和供肥能力、土壤手化作用强度比对照均有较明显的提高。说明在常绿阔叶林采伐迹地上 ,采用人工促进天然更新是恢复常绿阔叶林 ,维持林地长期生产力较好的模式之一。

Based on the grain yield of Yuyang district from 1984 to 2003,the author chosen a suitable model to estimate net primary productivity of cultivated land of different region to research the relation between ecological environment and NPP of cultivated land.The results shown as follows:(1) The total amount of NPP of cultivated land in Yuyang district generally increased during 1984~2003.Its total amount has grown from(21.94)×10~4 t/a in 1984 to 57.98×10~4 t/a in 2003.The annual increasing rate was 5.24%.(2) The...

Based on the grain yield of Yuyang district from 1984 to 2003,the author chosen a suitable model to estimate net primary productivity of cultivated land of different region to research the relation between ecological environment and NPP of cultivated land.The results shown as follows:(1) The total amount of NPP of cultivated land in Yuyang district generally increased during 1984~2003.Its total amount has grown from(21.94)×10~4 t/a in 1984 to 57.98×10~4 t/a in 2003.The annual increasing rate was 5.24%.(2) The unit area amount of NPP of cultivated land in the north was not only much more than that in the south but also increased fast during 1984~2001.At the same time, the unit area amount of NPP of cultivated land changed little in the south.(3) During 1984~2001,the unit area amount of NPP of cultivated land in urban was the highest and that in suburb fellowed it.The total amount of NPP of cultivated land in urban,suburb and outer suburb of Yuyang district all increased generally,and that in outer suburb fluctuated largestly.(4)The increase of the NPP of cultivated land was partly because of increasing investition in agriculture,but mainly because of ecological environment improvement of Yuyang district.

以榆林市榆阳区1984~2003年各乡镇的粮食产量统计数据为依据,选用了适合农用地的净第一性生产力估算模型,对该区耕地净第一性生产力单位面积量及总量进行分区动态测算,以揭示生态环境对耕地净第一性生产力的影响。研究表明:(1)1984~2003年间,榆阳区耕地净第一性生产力总量在波动中上升,20 a内总物质量从21.94×104t/a增加到57.98×104t/a,年度递增率为5.24%。(2)在1984~2001年间,榆阳区北部耕地净第一性生产力远高于南部,且呈较快上升趋势,而南部黄土丘陵沟壑区的耕地净第一性生产力呈较平缓的波动变化,且略有下降。(3)在1984~2001年间,榆阳区城区、近郊、远郊的差异性在单位耕地面积净第一性生产力上体现为城区>近郊>远郊;在耕地NPP总量方面,城区、近郊和远郊都表现为在波动中上升,三区变化以远郊波动幅度最大。(4)榆阳区耕地净第一性生产力总量的大幅增长有农业投入增加的原因,但主要得益于该区的生态环境的改善。

 
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