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   生产力递减 的翻译结果: 查询用时:0.007秒
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生产力递减
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  “生产力递减”译为未确定词的双语例句
     The orthodox trade theory is set upon the assumption of decreasing marginal productivity of input and the framework of perfect competition market.
     传统贸易理论建立在投入要素边际生产力递减和完全竞争市场结构的框架上,由于分析框架的限制,传统贸易理论在研究行业内贸易,贸易与增长的关系以及贸易模式的动态演进等领域存在着许多不足。
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  相似匹配句对
     Creative productivity
     创意生产力
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     PRODUCTIVITY ENGINEERING
     生产力工程
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     Lysosomes decreased and lipofuscin increased gradually.
     溶酶体递减;
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     ⑦ analysis of natural decline;
     自然递减分析;
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Abstract Achievements of afforestation in China are world famous. Now the area ofman-made forests is 33. 79 million ha,being about 114 of the world total. But with theupsurge of afforestation , some worrying events have occurred. The monoculture of even-aged pure stands with single species has caused the gradual decrease of stand growth ,and leads to the loss of biological diversity ,disequilibrium of forest ecosystem and occur-rence of disasters. The paper gives examples of some countries and regions where...

Abstract Achievements of afforestation in China are world famous. Now the area ofman-made forests is 33. 79 million ha,being about 114 of the world total. But with theupsurge of afforestation , some worrying events have occurred. The monoculture of even-aged pure stands with single species has caused the gradual decrease of stand growth ,and leads to the loss of biological diversity ,disequilibrium of forest ecosystem and occur-rence of disasters. The paper gives examples of some countries and regions where estab-lishment of man-made pure forests with single species has raised troublesome prob-lems. The author believes that low productivity is one of important causes that speedsup the dwindling of tropical forests , and suggests that high yielding man-made forestsare the requisite for sustainable forest management.

中国造林与世界各地一样,纯林多,树种单调,因此发生的问题也相似。国内有识之士担忧,“前人栽树,后人遭殃”。国外同行也很重视我国关于杉木连栽使生产力递减的报道。包括德国在内的一些国家的造林实践却表明,纯林连栽并非必然减产。但造林树种单调与社会需求的多样性和环境立地条件的复杂性,确实构成了深刻的矛盾。如果不认真解决,人工林极难实现持续经营。

Models of climatic productivity of forests in China were established through regression analysis of net primary productivity of forests distributing in different geographical regions versus the corresponding meteorological variables.The established models in which annual precipitation was incorporated as the principal variable indicate a very closely correlation between forest productivity and its corresponding climatic factors,allowing to simulate distribution pattern of actual forest productivity effectively.By...

Models of climatic productivity of forests in China were established through regression analysis of net primary productivity of forests distributing in different geographical regions versus the corresponding meteorological variables.The established models in which annual precipitation was incorporated as the principal variable indicate a very closely correlation between forest productivity and its corresponding climatic factors,allowing to simulate distribution pattern of actual forest productivity effectively.By means of GIS in conjunction with the established models,the forest productivity in response to the climate change scenario in 2030 was predicted,suggesting that the predicted geographical distribution pattern of net productivity of forests in China was the same as that of current actual patterns,i.e.forest productivity gradually decreased with the increasing latitude and from south east to north west direction within China.The predicted net primary productivity of forests,however,was found to increase at the varying degrees in different geographical regions,as compared to the current climate scenario.The percentage difference of forest productivity between under the future climate change and the current climate scenario was found to increase with the increasing latitude,being opposite to the distribution pattern of actual net primary productivity of forests.This might be attributable to larger increase in air temperature and precipitation in the high latitudes than in the low latitudes under the future climate change.

根据中国不同地理区森林生产力和气候环境变量的数据构建了中国森林气候生产力模型,以此为基础研究了气候变化对中国森林生产力的影响。结果表明:在所构建的模型中,除海拔高度与净生产力的相关模型外,其它模型均有较高的实用价值,模型的拟合曲线变化,基本反映了中国森林现实生产力的地理分布格局;中国森林生产力的分布格局主要取决于气候环境中的水热条件,水分条件是决定中国大部分地区森林生产力水平和地理分布格局的主导因素;根据7个GCMs大气环流模型预测合成的2030年的气候情景,研究气候变化对中国森林生产力影响的结果是:气候变化并没有改变中国森林第一性生产力的地理分布格局,即从东南向西北森林生产力递减趋势不变,但不同地域的森林生产力有不同程度的增加。气候变化后中国森林生产力变化率的地理分布格局与森林第一性生产力的地理分布格局相反,呈现从东南向西北递增的趋势。

 
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