Table of Content

10 June 1995, Volume 14 Issue 03

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Energy-Flow Analysis in Xian Eco-Animal Breeding Model

Jiang Yongl, Zhang Jihong, Zhang Yuge, Yan Li, Guan Lianzhu, Xu Xiangcheng

1995, (3):  1-4. 

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Characteristics of energy flow in a Xian eco-animal breeding model in Dawa county of Liaoning province were analyzed based on the study of mass cycling. Photo-utilization efficiency of crops and conversion ratio of energy as well as the status and tole of organic manure energy input in the agroecosystem were analyzed.

Relationship Between Soil Water Content and Rice Yield of Main Crop and Ratoon Crop

Xiong Hong, Sombat Chinawong

1995, (3):  5-9. 

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In this study,rice was subjected to 16% and 21% of soil water content from 15 DBH(days be-fore harvest)to 13 DAH(days after harvest).The results show that:(1)the dormant buds were more sensitive to soil water content at 15 DBH than at 13 DAH. Rice yield of ratcon crop de-creased with decreasing soil water content;(2)survival rate of dormant buds and regenerated tillers and rice yield decreased with decreasing soil water content and days of water treatment;(3)yield reduction of main crop was caused by lower ripen grains and 1000-grain wt.;However,depression in grain yield of ratoon crop may be attributed to insufficient panicles in rice ratconing;(4)survival rate of dormant bud, regenerated tillers and yield of ratoon crop decreased sharply when the soil water content was lower than 21%,which may be regarded as critlcal soil water content to judge the effects of drought on rice ratooning from 15 DNH to l3 DAH.

Relationship Between seasonal Quantitative Variation of Soil Animals in Wheat Field and Environmental Factors in Northeast Heavy Frigid Region of China

Su Yongchun , Zhang Chongbang, Gou Yingbo

1995, (3):  10-14. 

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This study was made from April to September,1993.4492 specimen of soil animals were collect-ed,which belong to 3 families,5 genera and 13 species. Among them,Acarina,Collembola andNemetoda are dominant.The relationship between seasonal quantitative variation of soil animalsand 9 environmental factors are studied,and primary and secondary factors influencing this varia-tion are sought out through grey connected analysis.

Variations of Light Intensity Under Interplanting of Spring Cotton and Wheat

Sun Benpu, Zhang Baomin, Wang Yong, Li Xiuyun, Shi Weize

1995, (3):  15-18. 

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Owing to the shading by wheat,the growth of spring cotton seedling was retarded in the inter-planted field. There were distinct reiations between irradiance and degree of shading by wheat. The degree of shading was aggravated with the increase of wheat height, and was improved by the spacing of cotton and wheat rows. Therefore, in order to get favourable growth Of cotton and increase production of wheat through interplanting,the suitable variety of wheat and rational spacing of cotton and wheat rows must be selected.

Life History Patterns of 55 Fish Species in Sichuan

Diao Xiaoming, Luo Yibing, Li Bo

1995, (3):  19-25. 

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Life history parameters of 55 fish species were gathered from litterature and this study,which include maximum weight, age, body weight and size at first-maturity, relative productivity and diameter of mature eggs, etc. Principal component analysis was used to analyze the ecological measures in 55 fish species. Based on the multiple values,r-K continuum in 55 fish species was drawn out.Correlation coefficient between age and body size at first maturity was the largest among ecological parameters. Life history patterns of fishes in Sichuan were mostly that of rselection. only those of sturgen and paddlefish were not competible with life patterns of other species.

Temperature selection for Larva of Liza haematocheila(Temminck et Schlegel)Mullet

Zhang Meiying, Yue Yuhuan, Hou Wenli

1995, (3):  26-28,32. 

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This paper attempts to seek out the selecting optimum temperature and avoiding temperature for larva of Liza haemarocheila(Temminck et Schlegel)Mullet. Temperatures were regulatd by an automatic controlling machine,type of WMZK-01. When the acclimation temperatures were set to 25℃,28℃,31℃,the selecting optimum temperatures were 27.2-28.5℃,29.0-30.5℃,31-32℃,avoiding temperatures were 34℃,35.2℃,35.7℃,respectively. The optimum tempera-ture and avoiding temperature increase with the increase of acclimation temperatures.

Effect of Eco-Environment on Dahurian Angelica Yield and Its Quality

Chen Xingfu, Ding Derong, Liu Shuirong, Lu Jin, Huang Wenxiu

1995, (3):  29-32. 

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Ecological environments in aberiginal and other distributed areas of Angelica dahurica(Fisch)Benth et Hook ver. formosona(Boise)Shan et Yuan are investigated and compared to reveal the effects of eco-environment on its yield and quality. It is concluded that the eco-environmental re-quirements for its normal growth include warm climate, plenty precipitation.sufficient solar radi-ation, plain topography, high underground water level, deep and loose soil with rich nutrients and high water-nutrient conservation abllity.etc.

Evolution of Life History Strategy in Plants

Ban Yong

1995, (3):  33-39. 

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The adaptation of plants to environment is mainly to increase their fitness. Due to the presence ofselective pressure, plants have to make adaptive responses,which constitute life history strategy.Life history strategy is the core of population biology of plants. In this paper, key selective pres-sures from one dimention to multiple dimensions and life history strategies related to them,life history strategies in each phase of the life cycle of plants from fruiting, disporsal, germinationand seedling to development were discussed.

Advances in Ecological Research of Clonal Plant Population and Some Related Concepts

Liu Qing, ZhongZhangcheng

1995, (3):  40-45,70. 

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Based on information obtained from ecological researches of clonal plant population in the world,the advances in this field was reviewed, and some concepts of clonal plant population ecology was defined.

Theoretical Analysis on Sustainable Use of Natural Resources

Zhao Jingzhu

1995, (3):  46-48. 

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This paper comprehensively analyzes the connotation and main viewpoints of sustainable ure of natural resources, discusses the concept of functional stock and evaluation standards for sustain- able use of non-renewable resources , and proposes the notion of functional stork for selective re-source space and evaluation standards for sustalnable use of multi-resources.

Regional Distribution And Exploitation of Livestock Husbandry Pro-ductivity in Gansu Province

Niu Shuwen

1995, (3):  49-53. 

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This paper estimates the potential preductivity of livestock husbandry and analyzes its regionaldistribution on the basis of statistical data of agricultural resources investigation and experimentaldata at different sites. Through analysis of the livestock population structure and variety, mea-sures for exploiting the potential preductivity of livestock husbandry are put forward.

Land Desertification in Liaoning Province and Countermeasures for Its Prevention

Zhu Jiaojun, Jiang Fengqi

1995, (3):  54-58. 

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Based on conceptual review of desertification, the situations of land desertification in Liaoningprovince were analysed.About 60.7%of the total land area of Liaoning province has been affected by desertification or potential desertmcation. Factors resulting desertification include waterand soil erosion, desertification,salinization, forest and grass land degeneration, etc. Strategiesfor preventing further desertification were also put foeward in the paper.

Review on Light Variation in Tea and Other Woody Plants Intercropped Plantations and Eco-physiology of Tea Plants

Zhou Zhixiang

1995, (3):  59-63. 

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The tea and other wedy plants intercropped plantation has a long history. There are many suc-cessful models in increasing economic benefits of tea plantations. However, there have been argu-ments abeut advantages and disadvantage of the intercropped plantation for a long time. In this paper, proceeded from light variation in tea plantations, the influences of environmental change on the morphogenesis,net photosynthetic rate,growth,development and metabolism of tea lesves in tbe intercropped plantations as well as essential studies on tea plant ecophysiology in the last decades are summarized.

Influence of Biological Treatments on Soil and Water Conservatbn and Tree Growth and Development in Orangr Orchard

Zhang Mingfu, Zheng Guolon

1995, (3):  64-66. 

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Three years experiments of soil and water conservation with biological treatments such as planting creeping orchid on terrace walls and interplanting soybean, peanut, etc. on terrace levels in mountainous young orange orchard indicated that,the effects of soil and water conservation in-creased by 395.4-412.0%over control; alkalized nitrogen in soil increased by 316.6-466.0% over control, available P increased by 233.3-333.3%and available K increased by 85.7-100%. The amount of sprouted shoots of orange increased by 48.2-71. 42%over control and the fruit yield per tree increased by 58.7-75.2%.

An Outline of Testing Methods and Conditions in Biological Statistics

Fang Jiming, Liu Laifu

1995, (3):  67-70. 

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This paper gives an outline of testing methods in biological statistics which can be used to different types of variables and experimental treatments, especially that of nonparametric analysis andtes of related samples.

Use of Principal Component Analysis in Selecting Monitoring Plants for Fluoride

Ma Enlin

1995, (3):  71-73. 

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The method of principal component analysis was applied to the selection of monitoring plants for fluoride,and two complex indexes with difinite meanings were found. The ability of 17 monitoring plants for fluoride were estimated according to the complex indexes. The result showed that this estimation was more accurate than common methds. Therefore,a new methed was provided for the selection of monitoring plants.

Discussion on the Inconstancy of b Value in Taylor's Power Law with Special Reference to Veg-etable Aphids, Myzus persicae and Lipaphis erysimi

Wang Xingeng, Liu Shusheng

1995, (3):  74-79. 

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The coefficient b in Taylor's power law has been interpreted as an index of aggregation,with characteristic value for a given species, and indepondent of sampling environment.Systematic samplings of aphids on crucifer vegetables were carried out during 1985-1992 in the suburb of Hangzhou. The results of test showed that the estimated values of Taylor's b of the two aphids,Myzus persicae and Lipaphis erysimi were significantly interspecifically different.However for a given species,the b values were not constant among sampling populations in different environment. It should be pointed out that different sampling coverage may lead to the inconstancy of b.Therefore,cautions should be given in the use of b for explaining spatial behaviors or comparing interspecific difference of aggregation.