农业土壤的

In order to improve the analytical quality of the background values in soil s and crops, an intercomparison test among 23 laboratories has been organized.

为了提高农业土壤、作物背景调查分析的质量，农业部环境监测研究所分别组织了土壤参考样品的比较测试。

The soil in karsts is the base of the local agriculture. In this dissertation, 6 profiles are chosen as the object of study.

岩溶裂隙土壤是当地农业生产的基础，也是生态环境的重要组成部分，直接针对这种溶裂隙土壤的研究甚少。

The aim was to study the relationship between soil microorganism and soil enzyme activity in facility agriculture.

［目的］研究设施农业土壤微生物和土壤酶活性的关系。

Other factors that were found to have positive effects on soil nutrientsinclude the multiple cropping index and the practice of plowing stalks back into theland.

相对于土地调整形成的地权不稳定，土地交易权不完整更不利于保持土壤的可持续生产能力，对农业土壤肥力有明显的负面外部效应。

With development of the modern agriculture,improvement of phosphorus utilization efficiency is very important for promoting sustainable agriculture development.

随着现代农业的发展，不断提高土壤磷素营养的有效利用率，对促进农业生产的持续发展具有重要的现实意义。

NS had higher respiratory quotient at 10~20cm, thus younger microbiology, and CN had younger microbiology at 0~10cm. This was good to sustain soil qualified characters and sustainable potentiality. This showed that mechanic tillage and biological tillage were of the same importance in some degree. It was important for reducing energy cost to enhance the effect of microbiology in soil nutrtient transferring.

免覆在10~20cm土层呼吸商较高，微生物年轻化，常无在0~10cm土层微生物年轻化，对维持土壤的优良性状和可持续利用潜力有益，这在一定程度上说明机械耕地和生物耕地的同等重要性，充分提高土壤微生物在养分转化中的作用对于降低农业生产中的能耗有重要意义。

The results show that the global N\-2O emission per year is about 14.7 TgN\-2O\|N, in which 57% and 43% from natural and anthropogenic sources respectively, 92% from N biogeochemistry and only 8% from N abiology, 70% from soil\|related sources, and about 20% attributable to agricultural soil.

得出全球N2 O年释放总量约 1 4 。7TgN2 O -N ，其中自然源和人为源分别占 57%和 4 3 %。年释放总量中N的生物地球化学过程约贡献92 %、非生物作用过程仅贡献 8%；与土壤有关的释放源约贡献 70 %、农业土壤贡献2 0 %。

Based on soil magnetism investigation on one of area in Hebei province tibility data to describe the soil magnetic background of plain area in Hebei province, and to study the method of biomagnetism application in agriculture.

通过对河北省平原区某地土壤样品的磁性测试，试图分析河北省平原区的土壤磁性背景，探讨生物磁学农业应用的途径。

Because of the poor management of the livestock farm and its disjointing with agriculture, a large amount of the livestock wastes are disposed at random, which pollutes the water, soil and air, effects the health of people, destroys the biological environment, and disturbs the further development of the livestock industry.

随着农业结构调整和农业产业化的推进，规模化、集约化畜禽养殖业的迅猛发展，规模由小到大，范围由点到面，成为发展农村经济和农民致富的重要途径之一，但由于畜禽养殖业管理薄弱和农业与养殖业脱节，致使大量畜禽粪便、污染物随意排放和流失，不仅对水体、土壤及空气造成了污染，影响了人们的健康，破坏了农业生态环境，而且成为畜禽养殖业可持续性发展的瓶颈。

Burrough P A The Fractal dimensions of land scapes and other environmental data 10.1038/294240a0 Nature , 1981,null

鲁植雄 分形理论及其在农业土壤中的应用土壤学进展， 1994，5

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。