中国生态农业学报(中英文)

1997, 5(4): 7-10.

Abstract(643) PDF(873)

Abstract:

Summing up experiences to increase the standard of eco-agricultural county construction

Guo Shutian

1997, 5(4): 11-13.

Abstract(1093) PDF(813)

Abstract:
Characters and outstanding achievements in eco-agricultural county construction in China are evaluated；developing strategies for how to continously increase the standard of eco-agricultural county Construction are presented pand problems that needs to be paid attention to and solved in the current eco-agricultural county construction are discussed.

Application of systems engineering for the development of eco-agricultural construction

Zhang Xiangshu

1997, 5(4): 14-17.

Abstract(1094) PDF(770)

Abstract:
The importance of application of systems engineering in strengthening up the goals，entirety，openness and predictability of eco-agricultural construction is discussed．How to recognize the functions of eco-agricultural systems，correctly deal with its overall internal coordinate relation and the mutual adaptability with the external environiqlent,and the connecting relation of its different developing stages are evaluated for increasing the standard of eco-agricultural construction．

Several suggestions on current eco-agricultural construction

Zhao Wenhuan

1997, 5(4): 18-19.

Abstract(1032) PDF(907)

Abstract:
Suggestions were presented on the focal point of the work,essentials and emphases of current eco-agricultural construction based on the working practices.

Modelling soil warer dynamics of dryland wheat under different annual rainfall conditions in hilly loess plateau of south Shanxi

Zhou Naijian, Miao Guoyuan, Yin Jun, Lu Bu

1997, 5(4): 20-23.

Abstract(848) PDF(858)

Abstract:
The space-time dynaraics of soil water of dry1and wheat are analysed under same natural conditions in three different annual rainfall conditions (wet year，normal year and dry year)by using regression isogram method，The results show that the soil water “peak”,“ridge”，“slope”and“saddle”formed by regression isogram had different characters under different annual rainfall conditions，and theye are also difference among the zones of wilt value and the isogram value．Then different soil water dynamics and wheat yields Were formed under different rainfall condition.

Sulfur requirements of rape seedlings with various backgrounds of seed glucosinolate contents

Wang Qjngren, Li Jiyun, Lin Bao

1997, 5(4): 24-28.

Abstract(1305) PDF(946)

Abstract:
The relationships of sulfur requirments，glucosinolate and sulfur contents in plant tissue and roots of rape seedlings with different glucosinolate contents in seeds and S supply were studied by sand culture in greenhouse．The results show that to obtain highest yield (biomass),more S was required by rape seedlings with lower glucosinolate contents in seeds than those with higher glucosinolate contents in seeds．S contents in plant tissue for three varieties were significantly exponentially correlated with S supply，and no difference existed among the varieties．However，S contents in root were highly correlated with S supply in quadratic curve，and there were differences among varieties with different glucosinolate backgrounds．Quadratic regressional relation was found between glucosinolate contents in plant tissue and S supply.Tissue glucosinolate contents were higher in varieties with higher background glucosinolate，and they aiso synthesized and accumulated more glucosinolate in plant tissue than those with the lower background glucosinolate，showing some resistance to tissue glucosinolate aecumulation．Then it is important to apply more S fertilizer to double lower rape varieties．

Material flux of agro-forestry systems on slope iu hilly regions of Sichuan basin

Xiang Chenghua

1997, 5(4): 29-32.

Abstract(1002) PDF(943)

Abstract:
Results from the analysis of the material flux showed that the agro-forestey system had higher nutrient accumulative and utilization abilifies than the single farmland system．There were surp1us of N and P in the agro-forestry system，while K WaS deficient．Measures were presented for improving the K supply．

Analysts of the ecological and economic benefits of different tillage systems in arid and semi-arid regions

Ma Damin, Wang Xiu, Ning Jizhou, Sun Haiguo

1997, 5(4): 33-35.

Abstract(1326) PDF(884)

Abstract:
Results from three years’experiments showed that the minimum tillage for winter wheat and zego tillage for maize，which could improve the sustainable development of agrlculture and fully utilize the rural natural and economic sources，was the optimum mechanization tillage system in the arid and semi-arld regions with two crops a year planting pattern by comparing different tillage systems.

Classification of meteorological calamity degree for three crops and division of calamity loss rate in Hebei Province

Liu Llan, Wang Wei, Liu Dongdu, Guo Yingchun, Yan Yiling

1997, 5(4): 36-39.

Abstract(1683) PDF(971)

Abstract:
Calamity loss rate is the base for calculauon of insurance premium．The technique of “resolve-coordinate” of large system theory was used in classification of meteorological calamity degree of winter wheat，maize and cotton and regional division of calamity loss rate in Hebei Province．For the purposes of rationally and correctly determining regional calamity loss rate，regional division of the pereanial average calamity loss rate was used as the bastc control layer and the classification system of regional type and unit merging was used to conduct the regional division；while the perennial average calamity loss rate was utiliged as the calculation index to reflect the macro-and micro-space distribution of calamity loss．

The impacts of climate change on agrlcultural production in Tibet during the recent thirty years

Du Jun

1997, 5(4): 40-44.

Abstract(1054) PDF(975)

Abstract:
Results from analysis of the dynamics of climatic resources during the recent 30 years in the main agricultural regions in Tibet showed that climatic warming mainly ocurred in winter and summer,especially in June．Accumulated temperature was increasing，and frostt-free period was shortening．Rainfall along the river and in Changdu was decreasing at the rate of 4～30mm per year，while in the south-east Tibet，annual rainfall gradually increased．Potential light-temperature productivity in 1980s was higher than those in 1960s and 1970s at increasing rate of 11～62kg／hm² annually during the recent thtee decades．For the potential climatic productivity，the higheat appeared in 1970s，and the lowest in 1980s．

A preliminary study on the differentiation mechanisms of soil salinity and plant community of microtopography

Hu Chunsheng, Wang Zhiping

1997, 5(4): 45-49.

Abstract(1184) PDF(929)

Abstract:
Distribution of soil salinity and plant community and their interrelation in several types of microtopography in coast zone were studied. The results show that the microtopography is the key factor affecting the distribution of soil salt. Rainwater accumulation caused by microtopography can effectively desalinize soil. Conducting eco-engineering such as creating microtopography for rainwater accumulation is an effective way for soil amelioration and vegetation construction.

Investigation of aquatic environmental quality and analysis of the dynamics of pollutants in coastal zone--A case study from Haixing County，Hebei Province

Li Huiying, Liu Guosheng, Cao Jian

1997, 5(4): 50-53.

Abstract(1262) PDF(1085)

Abstract:
The pollution statues of rivers and coastal water and their changes in Haixing County were evaluated．The investigation results showed that the pollution is becoming more serious．Pollutants are mainly from inland sources such as Zhangweixin River，Xuanhui River and Dakou River．The heavy mentals in sea are gradually accumulated during the procedures of making salt in sun．The water quality at Yangcheng reservoir was also investigated．

A preliminary study on the spatial distribution of soil salt in puddy coastal zone

Zhang Yumiming, Liu Jintong, Han Qinghua

1997, 5(4): 54-57.

Abstract(1361) PDF(990)

Abstract:
The spatial distrbution of soil saltal and its composition in puddy coastal zone were studied. The results showed that soil salinity gradually decreases from seashore to inland longitudely. Because of the effects of topography,the salt distribution along the coastal zone is striped. The main composition of soil salt in coastal zone is chlorid,and the soil is chlorid salinized soil.

A preliminary study on the distribution characters of plant community in Bohai seashore plain

Chen Suying, Feng Xuezan

1997, 5(4): 58-61.

Abstract(1042) PDF(933)

Abstract:
Based on field investigation and indoor analysis,characters of the structure,distribution and succession of the main plant communities in the seashore plain of Bohai in Haixing County were studied. The results showed that soil salinity is the key factor affecting the type,structure,spatial distribution and succession of plant communities.

The administration and management system for comprehensive development of hilly red soil areas--A case study from the experimental region in Qianyan,Jiangxi Province

Lou Huixin

1997, 5(4): 62-64.

Abstract(1171) PDF(929)

Abstract:
Rural economy and economic benefits of typical ecological households in the experimental region in Qianyan，Jiangxi Province were analysed，and the administration and management system and its composition of comprehensive development of the hilly red soil areas were studied．

Optimum models for eco-agriculture in north Shandong Province-A case study from Matou Village,Zouping County

Zhang Jianfang, Li Xiufen

1997, 5(4): 65-67.

Abstract(1198) PDF(1015)

Abstract:
Practices from optimum eco-aricultural construction showed that combination of agriculture,forestry and aquatic production;overall planning;cooperative implementing;building complete farm facilities and fully utilization of land resources were effective ways for improving the eco-agriculture of low productivity land in north Shandong Province.

Compound eco-agricultural model and its engineering techniques for high yield farmland in Changtu County Liaoning Province

Liu Changyu, Sun Yanfei

1997, 5(4): 68-74.

Abstract(1776) PDF(878)

Abstract:
By application of eco-engineering to construct the compound eco-agricultural model of farming,forestry and animal husbandary with the maize growing as the center,the unifying of economic,social and ecological benefits was realized during the processes of eco-agricultural county construction in Changtu County. The experience could be extended to other dryland farming areas in North China for sustainable development of agriculture.

Taking the ways of combination of eco-agriculture with agricultural industrialization

Liu Yan, Shang Haiyan, Zou Dechen, Yan Zhongwu

1997, 5(4): 75-78.

Abstract(2312) PDF(1291)

Abstract:
The industriaalization of rural economy is the upgrading strategies for increasing the financial incomes of county government and the people，and improving the eco-agricultural construction；and also is the only way to realize the sustainable development of rural economy based on analysis of the achievements of eco-agricultural construction in Baiquan County．

Construction of eco-agriculture for promoting sustainable agricultural development

Sui Guowen

1997, 5(4): 79-81.

Abstract(1068) PDF(920)

Abstract:
Combination of agriculture and animal husbandary．rationally disposing and fully utilizing of resources,strengthening up the construction of processing industries are effectiveways to improve the ecosystems in the weak ecology of inter-cross zone of agriculture and animalhusbandary based on the practices from eco-agricultural construction in Wengniute of Inner Mongolia．

1997 Vol. 5, No. 4