1) farming year
开垦年代
1.
The changing of amount of soil microorganism and enzyme activity in three type soils of different farming years;
三类不同开垦年代的土壤主要微生物类群和土壤酶活性的演变
2) tillage period
开垦年限
1.
The variation of organic-mineral complex content and the distribution characteristics of organic carbon fractions in black soil plough layer under different tillage periods;
不同开垦年限黑土耕层有机无机复合体变化及有机碳组分分布特征
2.
The study results of the content variation of organic carbon and its component in black soil during different tillage period show that both the content of TOC and its component decreasing and the soil Kos value increasing in ploughing layer and ploughing bottom layer are rapid at first 50 years cultivation.
不同开垦年限黑土土壤有机碳及其组分含量变化的研究结果表明:土壤开垦前50年,黑土耕层及犁底层总有机碳及其组分含量下降迅速,土壤有机碳的氧化稳定性系数变化强烈。
3) Age of Excavate
开凿年代
4) reclamation
[英][,reklə'meiʃən] [美][,rɛklə'meʃən]
开垦
1.
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
2.
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
5) cultivation
[英][,kʌltɪ'veɪʃn] [美]['kʌltə'veʃən]
开垦
1.
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
2.
Effects of Cultivation on Soil Properties at a Desert Site;
开垦对荒漠土壤性状的影响
3.
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。
补充资料：被开垦的处女地
被开垦的处女地
一九三○年，苏维埃全国开展农业集体化运动。达维多夫奉命来到顿河地区，组织那里的农民建立集体农庄。在与旧势力的反复斗争中，格列妙奇村的集体农庄终于冲破重重困难和阻碍，逐步得到了稳固和发展，使原本贫苦的农民在被开垦的处女地上建设起自己的新家园。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。