open up 'virgin' soil for agriculture是什么意思

用法例句

The impact of reclamation activities on soil sulfur contents in the Sanjiang Plain;

开垦利用对三江平原湿地土壤硫含量的影响

Effects of reclamation on soil organic carbon in Haibei alpine meadow;

开垦对海北高寒草甸土壤有机碳的影响

The changes of water physical characteristics,such as supply,storage,and outlet inmarshland and lowland of Sanjiang Plain before and after reclaimation have been studiedcomparatively on the basis of in situ data and test data.

根据点面调查资料和试验成果等，对黑龙江省三江平原沼泽湿地开垦前后水文物理性质──下垫面的供水、蓄水和泄水特性的变化进行了研究。

Effect of Tillage on the Distribution of Black Soil Organic Carbon in Organic-mineral Complex;

开垦对黑土有机碳在有机无机复合体分配的影响

67 mg·kg-1 after 3-year tillage (G3), and the labile and secondary available Pi increased in a wider range (P<0.

为了探讨开垦对三江平原湿地土壤磷(P)形态含量及组成的影响,采用Hedley分级方法对比分析湿地开垦前后及垦后弃耕土壤不同形态P含量变化。

Effects of Cultivation on Soil Organic Carbon Dynamics in Agroecosystems;

开垦对农业生态系统土壤有机碳动态变化的影响

Effects of Cultivation on Soil Properties at a Desert Site;

开垦对荒漠土壤性状的影响

We aimed to detect the process that human activities exert on ecosystem by investigating and analyzing the changes of plant community,especially underground soil and root carbon sequestration under long term cultivation and grazing in typical steppe area of Nei Monggol,North China.

以围封26 a草地(E26)为对照,研究了内蒙古典型草原区长期开垦与放牧对土壤-植物根系系统碳截存的影响。

Tradeoff of conflict between wetland protection and farmland reclamation in the Sanjiang Plain,Heilongjiang Province;

三江平原湿地保护与耕地开垦冲突权衡

The land reclamation and its influence on environment in West Liaohe Basin from 1902 to 1990;

近百年来西辽河流域土地开垦及其对环境的影响

Land reclamation at the end of Qing dynasty and beginning of Republic of China in the Mongolian area was always focused on by the foreign scholars, a great deal of fruits were gained during these long time.

清末民初的蒙旗土地开垦问题一直是国内外学者所关注的重要课题,取得了不少研究成果。

In many anthropogenic factors, reclamation of rangeland and high-speed population growth are the important causes for it.

近20年来,草原荒漠化十分严重,主要是人为因素造成的,其中草原开垦及其背后的人口过快增长是一个重要原因。