Grassland sandy desertification is one of the main reasons that the grassland ecosystem degradation and productivity decline continuously.
草地沙化是引起草地持续退化和生产力不断下降的主要原因之一。
It is believed that all tree utilization and short rotation system were main factors responsible for nutrient depletion and productivity decline of the stand sites.
“全树利用”及其短轮伐期经营制度是导致林地养分衰竭和生产力下降的主要原因。
This paper treats of the causes of site productivity decline of artificial forest, including planting methods, climate, soil, population structure, species and the proper measures.
本文从育林措施、气候、土壤、人工林群落结构、树种等方面概述了引起地力衰退的主要因素和应对策略。
Several explanations have been offered for this decline and for the discrepancy in productivity growth between the manufacturing and service sectors.
对于这种下降以及制造业和服务业之间生产率增长的差异，人们提出了几种解释。
Since 1980, productivity improvements in manufacturing have moved the United States from a position of acute decline in manufacturing to one of world prominence.
自1980年以来，制造业生产率的提高已使美国从制造业急剧衰退的境地成为世界瞩目的国家之一。
Many models of ocean chemistry and biology predict that as the ocean surface warms in response to increasing atmospheric greenhouse gases, phytoplankton productivity will decline.
许多海洋化学和生物学模型预测，由于海洋表面变暖来应对大气中温室气体的增加，浮游植物的生产力会因此下降。
Unfortunately, these losses have coincided with a decline in R&D productivity: the drugs discovered in the labs are not replacing the value of those medicines losing patent protection.
不幸的是，这种损失恰逢研发生产力的衰退：实验室里研发出药物无法取代那些失去专利保护的药物。
The decline of unionized labor in the past several decades has given employers more flexibility to increase productivity and adapt to rapid technological change and increased competition.
过去几十年公会劳动力的减少让雇主们有更大的空间来提高生产力，适应迅猛的技术变化和与日俱增的竞争。
Conservationists are concerned the drop in productivity, as a result of a lack of sandeels, will mean fewer breeding birds and continued decline of key species.
海鳗数量的减少会导致海鸟生育能力下降，也就是说，繁殖鸟以及一些重要的鸟类数量会继续减少。 对此，自然保护主义者表示密切的关注。
The International Energy Agency expects Mexico's oil production to drop at least 7% this year, after a 9% decline in 2008, because productivity of its main Cantarell oil field continues to plummet.
国际能源署(International EnergyAgency)预计，墨西哥的石油产量继2008年下降9%后，今年至少还将下降7%，因为其主要油田Cantarell的生产率继续在大幅下挫。
Surveys of Thai workers show a steady decline in their productivity, says Pracha Vasuprasat, an expert on migration at the International Labour Organisation.
国际劳工组织(InternationalLabour Organisation)内的移民专家帕拉查·瓦苏帕拉沙(PrachaVasuprasat)表示：针对泰国劳工所做的调查显示泰国的生产力逐年下降。
Compared with a 6 percent increase in plant productivity during the 1980s and 1990s, the decline observed over the last decade is only 1 percent.
20世纪80年代和90年代，植物生产力增加6%，相比之下，过去10年所观测到的下降则只有1%。
Farmers in the area have seen a significant decline in the marsh's productivity as successive droughts have driven away many animal populations.
该地区的农民们注意到了沼泽地生产力的重大下降，以及随之而来的干旱使得大量动物种群迁出。
In particular, we need to reverse the decline in productivity, improve success rates for regulatory approval and deliver medicines that add more than incrementally to a physician's capabilities.
特别是，我们需要扭转生产率的下降，提高监管机构审批的成功率，以及研制出对病人有更大帮助的药物。
Ironically, the two-decade decline in happiness has coincided with substantial increases in worker productivity.
讽刺的是，工作满意度持续二十年的下滑正巧是工人生产率大幅增长的时期。
Even so, most people's productivity does eventually decline with age; and pay needs to reflect this falling-off.
虽然如此，大多数人的生产效率还是会随着年龄的增长而降低；而工资则需要能够反映出这种下降趋势。
With continuing an oilfield development, its formation pressure tends to decline along with the horizontal fractures being closed, the permeability drawdown and the productivity being damaged.
随着油田开发的进行，地层压力逐渐下降，水平裂缝趋于闭合，渗透率大幅下降，严重影响了生产能力。
But if Brazil is to grow beyond 2020, when the working-age population will begin to decline as a share of the total, it will have to tackle its productivity problem.
2020年后巴西劳动年龄人口占其总人口的比例将开始下降，巴西经济若想继续保持增长，就必须提高效率。
Ironically, the two-decade decline in has coincided with substantial increases in worker productivity.
讽刺的是，工作满意度持续二十年的下滑正巧是工人生产率大幅增长的时期。
The fluctuations of the average total factor productivity of universities in Zhejiang are significant, and the proportion of universities whose research efficiency decline totals up to 50%.
浙江省高校平均全要素生产率波动较明显，科研效率下降的高校占比高达50%。
Based on production decline analysis, gas productivity curve analysis and well tests analysis, reservoir potential have a close connection with formation parameter and permeability.
根据产量递减分析、采气曲线分析以及试井解释可知：储层产能与地层系数和地层渗透率关系十分密切。
If Wells produce at natural productivity, their flow rates decline with the same speed as the mid-and high-permeability reservoirs.
若油井以自然产能生产，油井产量的递减速度并不快，而是与中高渗透储集层基本相同。
When the recovery of recoverable reserve is more than 80%, the single well fluid productivity rate will decline, the number of active Wells will reduce as the composite water cut is more than 90%.
可采储量采出程度达80%后，单井日产液、采液速度降低。综合含水达90%后，油井开井数降低。
During the test, the rock deformation built up a permeability drawdown cone around the wellbore of Well Kela 205, but the decline scope is small and its effect on productivity is not serious.
测试过程中岩石变形使近井区域形成了一个渗透率下降漏斗，但下降的幅度较小，对气井产量的影响也不大。
At present, northern grassland resources of China are facing a serious decline in grassland productivity and grazing capacity.
目前，我国北方草地资源面临着草地生产力严重下降，草地载畜量普遍降低的危机。
At present, northern grassland resources of China are facing a serious decline in grassland productivity and grazing capacity.
目前，我国北方草地资源面临着草地生产力严重下降，草地载畜量普遍降低的危机。
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