农田

Salix matsudana, Ulmus pumila, Quermus mongolica, Populus alba×P.beroliensis and Betula platyphlla are frontal 5 tree species with weight value 90.37, 90.12, 88.12, 87.55 and 86.2 respectively, were used for farmland protection forest; Acer negundo, Salix matsudana, Juniperus rigida, Fraxinus mandshurica and Ulmus pumila are frontal 5 tree species with weight value 78.14, 76.92, 75.96, 74.72 and 74.56 respectively, were used for urban protection forest; Ulmus pumila, Salix matsudana, Populus alba×P.beroliensis, Acer negundo and Larix gemelinii are frontal 5 arbor tree species with weight value 80.07, 79.07, 77.5, 72.42 and 71.67 respectively, were used for road protection forest; Salix matsudana, Populus alba×P.beroliensis, Ulmus pumila, Larixgemelinii and Betula platyphlla are frontal 5 tree species with weight value 92.37, 88.72, 86.62, 85.82 and 85.7 respectively, were used for river protection forest; Fraxinus mandshurica, Larix gemelinii, Populus alba*P.beroliensis, Ulmus pumila and Salix matsudana are frontal 5 tree species with weight value 89.61, 8.35, 87.12, 85.56 and 80.15 respectively, were used for wood forest; Cornus alba, Prunus tomentosa, Primus triloba, Syringa obalata and Sambucus williamsii are frontal 5 shrubs with weight value 82.93, 81.23, 80.85, 78.38 and 77.78 respectively, were used for landscape forest; and Acer negundo,Malus baccata, Sorbus pohuashanensis, Prunus maackii and Prunus padus are frontal 5 arbors with weight value 82, 81.52, 80.3, 79.62 and 78.9 respectively, were used for landscape forest; Prunus salicina, Prunu

根据哈尔滨地区不同林种的功能要求，给出了不同指标的期望值，通过查询系统可以得到旱柳、榆树、蒙古栎、银中杨、白桦为符合农田防护林的前五位的树种，权重值分别为90.37、90.12、88.12、87.55、86.2；糖槭、旱柳、杜松、水曲柳、榆树为符合城市防护林的前五位的树种，权重值分别为78.14、76.92、75.96、74.72、74.56；榆树、早柳、银中杨、糖槭、兴安落叶松为符合道路防护林的前五位的乔木树种，权重值分别为80.07、79.07、77.5、72.42、71.67；旱柳、银中杨、榆树、兴安落叶松、白桦为符合河岸防护林的前五位的树种，权重值分别为92.37、88.72、86.62、85.82、85.7：水曲柳、兴安落叶松、银中杨、榆树、旱柳为符合用材林的前五位的树种，权重值分别为89.61、88.35、87.12、85.56、80.15；红瑞木、毛樱桃、榆叶梅、紫丁香、接骨木为符合风景林前五位的灌木树种，权重值分别为82.93、81.23、80.85、78.38、77.78，糖槭、山丁子、花楸、山桃稠李、稠李为符合风景林前五位的乔木树种，权重值分别为82、81.52、80.3、79.62、78.9；李、杏、文冠果、山楂、野梨为符合经济林的前五位的树种，权重值分别为88.85、80.88、73.25、69.35、63.77。

Microbial population changes in farmland soil of different aged H. lupulus was investigated, and microbial number and diversity index in soil of different aged H.

通过测定22，20，18，8和5年啤酒花农田土壤微生物区系的变化，分析了不同植龄土壤微生物数量及多样性指数与啤酒花产量和品质的关系。

In the last several decades, along with the rapid development of scale livestock and poultry industry in China, the increase of deleterious contaminants, such as heavy metals, residues of animal medicine, salinities, and maleficent bacteria, in the manures of livestock and poultry made up of the limiting factors which affected the healthy function of farmland soil , even brought about eco-environment risk.

随着我国规模化养殖业的快速发展，畜禽粪中重金属、兽药残留、盐分及有害菌等有害污染物的增加，构成影响农田土壤健康功能的限制因素，甚至带来生态环境风险。

"This is a much-needed boost to our economy, our farms," said Marcello Pini, 50, a farmer, standing in front of the rapeseed he planted for the first time.

&这对我们的经济和农田，是一种急需的激励，&50岁的农民马赛罗。

The vegetation can be classified into 4 vegetation type groups,7 vegetation types and 20 formations.Sparganium stoloniferum community and Menyanthes trifoliata community are first recorded in China.

湿地向农田等其他的土地利用类型的转变，在地区和全球尺度上都产生了很深刻的生态影响，对资源利用者来说也有显著的社会和经济影响[3]。

Jaffé r T%Reeves R D%Becquer T The Ecology of Ultralmafic and Metalliferous Areas ORSTOM,New Caledonia , 1997,null

欧阳喜辉%崔晶%佟庆长期施用污泥对农田土壤和农作物影响的研究农业环境保护， 1994，6

In this paper,five factors causing waterlogging in the lowland polder area s of southern china are listed and reviewed based on the field ecosystem of waterlogging:climate,topgraphy and morphography,soil,hydrology and geology and human activities.

从农田渍害生态系统的角度综述了我国南方低洼圩区产生渍害的五大成因：气候因素、地形地貌因素、土壤因素、水文地质因素和人为因素；在分析南方各地治理渍害经验的基础上，概述了目前改造和防治渍害低产田的七大措施：搞好水利工程建设，实行水旱轮作，加强耕作管理，增施有机肥料，利用抗湿种质资源，喷施外源生长调节剂及应用高分子技术。

Suncus murinus was the dominant population in domestic of the small mammal community.

同时还探讨了家栖小兽群落与农田小兽群落之间的迁移和扩散的关系。

Isolation and purification of the mycorrhizal fungi led to the identification of 33 species in seven genera.

具体结果如下：在河北省、山东省的农田土壤和辽宁省矿区重金属污染土壤中采集有代表性的土样，从中分离出AM真菌7属33种。

The Ogallala Aquifer, one of the world's largest stores of groundwater, covers 225,000 square miles beneath parts of eight U.S.

奥加拉拉蓄水层是全球较大的地下水储层，面积225000平方公里，涵盖了美国德克萨斯州至南达科他州八个州的地下土层，是该国五分之一农田的灌溉源。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。