oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Temporal-spatial variation of elongating time of wheat in Huang-Huai wheat production area
黄淮麦区冬小麦拔节期的时空变化研究

ZHONG Xiu-Li,WANG Dao-Long,LI Yu-Zhong,ZHAO Peng,YAN Xu-Yu,SUN Zhong-Fu,
钟秀丽
,王道龙,李玉中,赵 鹏,闫旭宇,孙忠富

中国生态农业学报 , 2007,
Abstract: Twenty years data of winter wheat elongating time, varieties,vernalization feature,and average air temperature of every 10 days in spring,occurrence and injury of frost,etc. were collected from 36 agro-meteorological observation stations, which are located in Huang-Huai wheat production area and its around areas. With these data, the main factors that affect the elongating time of winter wheat were analyzed; the function on accumulative probability with time was established and the variations of some main parameters in this area were also analyzed. Finally,the causes for the variation in parameters were discussed and the guidance for the practical production was also proposed.
Drought evolution characteristics and precipitation intensity changes during alternating dry-wet changes in the Huang-Huai-Hai River basin  [PDF]
D. H. Yan,D. Wu,R. Huang,L. N. Wang
Hydrology and Earth System Sciences Discussions , 2013, DOI: 10.5194/hessd-10-2665-2013
Abstract: According to the Chinese climate divisions and the Huang-Huai-Hai River basin digital elevation map, the basin is divided into seven sub-regions by means of cluster analysis of the basin meteorological stations using the self-organizing map (SOM) neural network method. Based on the daily precipitation data of 171 stations for the years 1961–2011, the drought frequency changes with different magnitudes are analyzed and the number of consecutive days without precipitation is used to identify the drought magnitudes. The first precipitation intensity after a drought period is analyzed with the Pearson-III frequency curve, then the relationship between rainfall intensity and different drought magnitudes is observed, as are the drought frequency changes for different years. The results of the study indicated the following: (1) the occurrence frequency of different drought level shows an overall increasing trend; there is no clear interdecadal change shown, but the spatial difference is significant. The occurrence frequencies of severe and extraordinary drought are higher on the North China Plain, Hetao Plains in Ningxia-Inner Mongolia, as well as on the Inner Mongolia and the Loess Plateaus, and in the Fen-Wei Valley basin. (2) As the drought level increases, the probability of extraordinary rainstorm becomes lower, and the frequency of occurrence of spatial changes in different precipitation intensities vary. In the areas surrounding Bo Sea, the Shandong Peninsula and the Huai River downstream, as the drought level increases, the occurrence frequency of different precipitation intensities first shows a decreasing trend, which becomes an increasing trend when extraordinary drought occurs. In the middle and upper reaches of the Huai River basin, on the Hai River basin piedmont plain and Hetao Plains in Ningxia-Inner Mongolia, Inner Mongolia and Loess Plateaus, and in the Fen-Wei Valley basin, the probability of the different precipitation intensities shows an overall decreasing trend. The mountains with high attitude and Tibetan Plateau are located at high altitudes where the variation of different precipitation intensities with the increase in drought level is relatively complex. (3) As the drought frequency increases, areas I, II and V which are located on the coastal and in the river basin are vulnerable to extreme precipitation processes; areas III, IV, VI and VII are located in the inland area where heavier precipitation is not likely to occur.
Comprehensive Benefits of the Compound Agricultural and Forest Ecosystem in Raoyang Experimental Area in Huang-Huai-Hai Plan
黄淮海平原饶阳试区农林复合生态系统综合效益分析

Liu Yamin,Zhang Junying,Wu Bingqi,
刘亚民
,张均营,吴炳奇

中国生态农业学报 , 1995,
Abstract: Raoyang Experimental Area in Huang-Huai-Hai Plain,Which used to be a low production area,is under one of the national key scientific and technological projects,now it is changed into a area with good eco-environment,high production and high forest coverage by comprehensive management.The construction of the compound agricultural and forest ecosystem changed the local ecological condition,meteorological factors,content of CO2,dust content in air and bird numbers.Forest coverage was increased from 2% to 20%,crop yield was increased from 1.5t/ha to 7.5/ha.Remarkable ecological and economic benefits have been achieved.
Satellite observed crop calendar and its spatio-temporal characteristics in multiple cropping area of Huang-Huai-Hai Plain
黄淮海多熟种植农业区作物历遥感检测与时空特征

YAN Huimin,XIAO Xiangming,HUANG Heqing,
闫慧敏
,肖向明,黄河清

生态学报 , 2010,
Abstract: Multiple cropping is one of the most influenced intensified agricultural land use activity in China because of the increased pressure on water, ecosystems and environment. However, due to the lack of spatial and temporal explicitly data of multiple cropping and crop calendar, there were significant uncertainty in agricultural productivity and Carbon dynamic monitoring, modeling and evaluation on regional to larger scale. In Huang-Huai-Hai Plain, an important agricultural region in China, more than 70% of total cropland land area was planted with winter-wheat and maize double cropping system. It has been proved that identifying multiple cropping and crop calendar and assigning appropriate light use efficiency to C3 and C4 crops could substantially improve our ability to model and evaluate the seasonal dynamics of carbon flux in such winter-wheat and maize rotation system. In this study, we analyze spatial and temporal patterns of crop growth process and crop calendar in the winter-wheat and maize double cropping system using multi-temporal satellite images from the Moderate Resolution Imaging Spectral radiometer (MODIS) and in-situ observation of key crop phenological transition dates, and explore a method to examine and extract crop calendar of each crop season in Huang-Huai-Hai plain from MODIS Enhanced Vegetation Index (EVI) and MODIS Land Surface Water Index (LSWI) time series curves by combining agro-meteorological observation data and MODIS data with a resolution of 500m at 8-day intervals. Multiple cropping distribution, temporal transition characteristics and heterogeneity of the start and the end time of each crop season were examined and analyzed, and the method also was validated by comparing with in-situ observed start date and end date records of winter-wheat and maize. The method and crop calendar products discussed in this paper could be applied in agricultural productivity estimation, biogeochemical cycle modeling and agricultural ecosystem monitoring.
Research on strategic agricultural division and layout of the Huang-huai-hai Plain
黄淮海平原农业战略区划与布局研究

HOU Man-Ping,HAO Jin-Min,
侯满平
,郝晋珉

中国生态农业学报 , 2010,
Abstract: Much research has been on the agro-divisions of the Huang-huai-hai Plain, but little quantitative study has ever been undertaken. This paper investigated 301 counties in the Huang-huai-hai Plain, and quantitatively and qualitatively probed the general strategic agro-divisions and layout of natural resources, crop output and gross agro-output values of the plain. The plain is primarily divided into low and high production areas. The high production areas are in turn divided into 7 micro-advantageous regions, which are advantageous regions of foodstuff; cotton; oil crops; foodstuff and cotton; foodstuff and oil crops; cotton and oil crops; and foodstuff, cotton and oil crops. On this basis, specific layouts are developed for each group. Such is of strategic and theoretical significance to agricultural development in the Huang-huai-hai Plain.
Soil Organic Carbon Stock and Crop Yields in Huang-Huai-Hai Plains, China  [cached]
Xiangbin Kong,Baoguo Li,Rattan Lal,Lei Han
Journal of Agricultural Science , 2012, DOI: 10.5539/jas.v4n12p140
Abstract: The Huang-Huai-Hai-plains (HHH) is the main wheat (Triticum aestivum)-maize(Zea mays) production area of China. Therefore, adoption of appropriate fertilizer management strategies of improving soil organic carbon (SOC) and crop yields is an important option in HHH. These studies included a total of 6 land use and management treatments including: (i) no fertilizer(CK); (ii) chemical nitrogen(N), phosphorus(P) and potassium(K) fertilizers separately(UF); (?) combined application of chemical fertilizer N,P and K(CF); (?) wheat and maize straw retention or manures including that from soybean (Glycine max) cake, chicken, horse and cow dung or manures only (O); (?) combined application N, P and K and organic fertilizers (CFO); (?) combined application of chemical fertilizer N,P or K separately and organic fertilizers (UFO). The data indicated the following: (i) The baseline SOC stock of arable land was 18.9±1.8 Mg ha-1 and the corresponding crop yield was 4.4±1.5 Mg ha-1; the highest SOC stock was 24.6±1.8 Mg ha-1 for CFO and the corresponding crop yield was 9.7±3.2 Mg ha-1; (ii) The rate of increase of SOC stock was in the order of CFO>UFO>CF>O>UF, while that of increase in crop yield was in the order of CFO>CF>UFO>UF>O; (?) Crop yield increased (Mg ha-1 yr-1) by 0.114 in UF and CF, by 0.039 in treatment O,CFO and UFO, and by 0.033 in CK by increase in SOC stock by 1 Mg ha-1; (?) Yield increased (Mg ha-1 yr-1) by 0.298, 0.119,0.065, and 0.022 by over 5, 10, 15, and over 25 years by increase in SOC stock by 1 Mg ha-1. Therefore, the combined application of chemical and organic fertilizers is the best choice for the developing countries to adapt to and mitigate climate change while advancing food security.
THE FLUCTUATION ANALYSIS OF THE CROP PRODUCTIONIN HUANG-HUAI-HAI PLAIN
黄淮海平原种植业生产波动分析

Zhu Dehai,Yan Tailal,Qing Duxue,
朱德海、严泰来、卿笃学

资源科学 , 1994,
Abstract: ith time series data on agricultural production covering the period of 1983to 1989 for 253 counties in Huang-Huai-Hai Plain, the relationship between fluctuations of total output value of crop products, of total output of main crops,oftheir per mu yields, and of their planting areas are analyzed in time and space,using multivariate linear regression and progressive regression methods. Again,the causes responsible for the fluctuations are analyzed and the suggestions forstabilizing crop production are given.
Spatio-temporal variations of winter wheat water requirement and climatic causes in Huang-Huai-Hai Farming Region
黄淮海农作区冬小麦需水量时空变化特征及气候影响因素分析

YANG Xiao-Lin,SONG Zhen-Wei,WANG Hong,SHI Quan-Hong,CHEN Fu,CHU Qing-Quan,
杨晓琳
,宋振伟,王 宏,石全红,陈 阜,褚庆全

中国生态农业学报 , 2012,
Abstract: Information on crop water requirement and the changes in this factor in time and space are critical for irrigation schemes,water resources planning and decision-making.Based on observed daily meteorological data in 50 weather stations in 7 sub-zones of Huang-Huai-Hai Farming Region(HFR) in 1960-2009,winter wheat water requirement and irrigation amount were simulated using the modified SIMETAW model.Results showed that winter wheat water requirement decreased from 1960 to 2009,with a significant decrease of 9.21~18.90 mm from 1970 to 1999.Winter wheat perennial average water requirement was 452.4 mm,coupled rainfall degree for winter wheat growing season was only 0.40.Winter wheat irrigation amount varied among different sub-zones,it increased at the rate of 10.02~13.48 mm per decade in western Henan Province and central Shanxi and Shaanxi Provinces.With re-gard to spatial distribution,water requirement and irrigation amount during winter wheat growing season were higher in the periph-eral than in the central regions.Both water requirement and irrigation amount were highest in the west Henan Province with values of 457.32 mm and 335.33 mm.However,winter wheat water requirement and irrigation amount were lowest in the lower Haihe Plain with values of 363.24 and 247.51 mm.While temperature significantly increased,wind speed,humidity and solar radiation significantly decreased and also with an insignificant decrease in precipitation from 1960 to 2009.The negative trend in winter wheat water re-quirement in HFR was mainly attributed to declining solar radiation,which was in turn driven by some other climatic factors.Correlation analysis showed that temperature,sunshine hour and wind speed were positively correlated with winter wheat water re-quirement,while relative humidity was negatively correlated with it.
ENVIRONMENT EFFECTS AND ADJUSTMENT AND CONTROL COUNTERMEASURES OF WATER RESOURCE UTILIZATION IN THE HUANG HUAI HAI PLAIN
黄淮海平原水资源开发的环境效应及其调控对策

Wu Kai,
吴凯
,许越先

地理学报 , 1997,
Abstract: The relationship between water resource utilization and agricultural sustainable growing in the Huang Huai Hai Plain was briefly discussed in this paper. The per capita or per hectare amount of water resources in the area accounts for 29 per cent of the country's average. The grain yield per hectare is increased by 94.28kg and the total output of grains is increased by 2.05 billion kg, when the irrigation rate is increased by 1 per cent in the area. The present situation of water resource use and the environment problems of water resource utilization in the four type regions were expounded in the paper, such as water contamination and excessive exploitation of groundwater in the shallow layer in the piedmont plain region, fluorine in drinking water, funnel of groundwater and earth subsidence in the Lower Haihe Plain Region, floodwater in the Huang Huai Plain Region, running out of flood in the Huanghe River and the invasion of seawater in the coastal plain region and so on. In view of the water environment problems as said above, the adjustment and control countermeasures of water resource utilizaion were suggested, which can be used as references by the policy making departments in the districts (cities) and provinces (cities) concerned.
A COTTON PRODUCTION MANAGEMENT SYSTEM FOR THE HUANG-HUAI-HAI REGION IN CHINA
黄淮海地区棉花生产管理系统

Dong Zhanshan,Han Xiangling,
董占山
,韩湘玲

自然资源学报 , 1996,
Abstract: A cotton production management system for the Huang-Huai-Hai region in China has been established by applying the techniques of crop simulation model and knowledge engineering.It is composed of the cotton simulation model,GUI and data base.It can suggest the reasonable applications of nitrogen fertilizer,irrigation and plant growth regulator.The computer simulation experiments for selecting the optimal row spacing and planting density have been made by using the COTMAS.The results show that the selected optimal values are basically in conformity to the practical ones.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.