Spatiotemporal Evolution Characteristics Study on the Precipitation Infiltration Recharge over the Past 50 Years in the North China Plain

The spatiotemporal evolution characteristics of precipitation infiltration recharge during the past 50 years are discussed in this paper. This research is significant for groundwater resource ra-tional...     

洛阳方言同音字汇(上)

洛阳方言属于中原官话洛嵩片,以洛阳老城区方言为代表。通过实地调查,对洛阳方言的声韵调进行了归纳,在此基础上排列了洛阳方言同音字汇。     

Study on the Estimation of Groundwater Withdrawals Based on Groundwater Flow Modeling and Its Application in the North China Plain

The amount of water withdrawn by wells is one of the quantitative variables that can be applied to estimate groundwater resources and further evaluate the human influence on ground-water systems. The a...     

松嫩平原农牧交错区玉米去叶管理对收获高品质粗饲料的影响

在不影响玉米籽实产量的前提下,探讨了提前利用玉米秸秆青绿叶片的可行性.在大田玉米处于开花期和抽丝期的3个可辨识的阶段,对玉米穗位下叶片进行了不同数量的去叶处理.结果表明:去叶时间对产量影响显著,去叶数量对产量影响不显著,并且没有互作效应.在抽丝期雌穗花丝可见2～3cm时从穗位下去叶,去叶数量对产量影响不显著,特别是留8个叶片的处理与不去叶的处理产量对比差异不显著,此时去叶获得的青绿叶片其营养价值、消化率、代谢能都大于7月和8月份的羊草和收获后的干叶片.在开花后雌穗不可见时去叶,将引起严重减产.雌穗可见花丝不可见时去叶,不同处理对产量影响不同.     

Using EARTH Model to Estimate Groundwater Recharge at Five Representative Zones in the Hebei Plain,China

Accurate estimation of groundwater recharge is essential for efficient and sustainable groundwater management in many semi-arid regions. In this paper, a lumped parameter model (EARTH) was established ...     

Evolution Characteristics and Influence Factors of Deep Groundwater Depression Cone in North China Plain,China--A Case Study in Cangzhou Region

The North China Plain (NCP) is one of the global hotspots of groundwater depletion, groundwater is almost the only source of water for agricultural, industrial and drinking water in this region. After ...     

Experimental Evidence for Hyperfiltration of Saline Water through Compacted Clay Aquitard in the Hebei Plain

It becomes an increasing concern that groundwater quality in exploited deep confined aquifer may deteriorate due to brackish water leakage from its overlying saline aquifer in Hebei Plain. However, the...     

三江平原不同土壤类型中微生物种类多样性研究

通过对三江平原连年耕作大豆田的土壤（DD）、连年耕作水稻田的土壤（SD）、未开垦过原生态的土壤（XYZ）、耕作过又被退耕还草的土壤（C）4种土壤类型中的微生物进行分离鉴定及数量统计分析,结果表明三江平原土壤中微生物主要由8种优势细菌菌属组成,微生物在土壤剖面中的分布趋势是表层（0～20cm）〉亚表面（20～30 cm）...     

2002-2011年华北平原北部农田缺水时空分布特征研究

利用华北平原北部气象站点实测气温、降水、风速等基本气象要素数据,结合土壤相对湿度数据,计算降水量、作物需水量和土壤水分变化量3个水分循环的核心变量,构建华北平原北部农田水循环模型,设计缺水量指标,并分析2002—2011年华北平原北部农田缺水量的逐旬时空变化。结果表明:华北平原北部的农田在整个作物生长阶段严重缺水,大多数月份所有地区缺水,仅7月中旬自然水分较为充足;春季是华北平原北部农田干旱最严重的时期,以河北中南部地区春旱最为严重;秋季干旱程度相比春季较轻,干旱相对严重的区域位于研究区域西北部;衡水以及北京西部地区在整个作物生长阶段均严重缺水,是干旱最为严重的区域。研究结果可为研究区水分利用管理及农田灌溉提供参考。     

Biomorphic analysis as a basis for paleoenvironmental reconstruction

A definition for biomorphic analysis is suggested. The objects of analysis - biomorphs (phytoliths, sponge spicules) - are characterized with respect to their diagnostic features and methods of data interpretation. The possibility of to include studies into the general system of paleoenvironmental and palaeosols interpretations from biomorphic analysis is substantiated with concrete examples.