Table of Content

10 February 1990, Volume 9 Issue 01

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Niche analysis of species in vegetative succession on zokor mounds

Wang Gang, Du Guozhen

1990, (1):  1-6,14. 

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The niche overlap and niche volume of ten dominant species were measured on indirect ha-bitat gradients with improved formula measuring niche overlap.Niche ordination,from theoverlap matrix resulted in a r-K continuum of successional gradients,and based on it,theecological strategy of successional species was described quantitatively.

Effcct of moth-trapping with lamplight in a forest-fishpond complex ecosystem

Yu Dan, Dong Shilin, Ding Baoyong, Wang Yuxi, Zhao Kezun, Li Juntao, Qian Feng

1990, (1):  7-10. 

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Most insects harm forest intensely,Large amounts of pharmaceuticals have been used toeliminate those insects in the cost of money and polluted environment,However,luringinsects into fishpond with moth-trapping lamps is beneficial both in the biological preven-tion of insects and in providing animal food for fish cultivation,The comparative experi-ments indicate that fishes in fishpond with trapping lamps grow better than in thatwithout lamp.If the aboundant resources of forest insects are made full use for fish cultiva-tion,the economic and ecological benefits of agriculture will be increased considerably.

Preliminary study on the formation of litters in Leymus chinesis grassland in Songnen plain

Guo Jixun

1990, (1):  11-14. 

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This paper reports a preliminary study on the patterns of litter formation in Leymus chine-sis grassland in Songnen plain.The mortality process of Leymus chinesis is observed,itsmortality rates in different seasons are calculated,and the mathematical models of litterproduction are constructed.The gross quantity of litter is determined as 145.5g穖^-2,whichequals to the sum of annual production of litter and its weight losses during the period.

Relations between fir mortality and Huazang temple conflagration in Jinding of Emei Mountain

Liu Zugui

1990, (1):  15-18. 

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The Huazang Temple was caught fire in 1972.The mortality of fir trees near the firerelics reached to 94.6%.The ages of died trees were 17—40 years.According to the estima-tion of temperature rise by radiative heating in different distances from the fire centre andan experiment of needle scorching by artificial simulated fire,it is infered that radiativeheat from the Huazang Temple conflagration is the main cause for the mortality of the firforests in a range of 1.0×10⁴ m²,about 50 m away from the fire centre.

Energetic analysis of agro-ecosystem in mountainous and hilly areas of southern Hunan province

Ma Jinzhong, Liu Houpei

1990, (1):  19-22,27. 

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This paper presents a case study describing the energy flow and conversion in paddy-fieldecosystems in southern Hunan province,which is located in mid-subtropical zone.Therelationship between input and output of energy was also discussed.

Study on the water complement manners of young Chinese alligator during its hibernation

Zhang Zhengdong, Liang Baodong, Yang Qun, Zhu Xianfa

1990, (1):  23-27. 

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This paper deals with the water complement manners of young Chinese alligators duringits hibernation period.40 young alligators are tested in two groups.The experimental groupincludes 15 individuals which are kept wet skin and dry head,with a bath treatment eachweek.The contrastive group consists of 25 individuals which are immersed in 2cm deepwater.With 43 days feeding after hibernation.It is found that:alligators in experimentalgroup are all alive,their body-weight grows faster than that of the contrastive group.Thecontrastive group has 2 alligators died.The effective way for water complement of youngalligators is by skin absorption and not by drinking.

Grey correlational analysis and prediction of eco-environment and silt discharge amount to the Fenhe river reservoir

Fan Lanying

1990, (1):  28-31. 

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The grey system theory founded by professor Deng Julong is applied in the analysis,andas a result of which,eco-environment condition is recognized as the dominant factor influencing silt discharge amount at the upper reaches of the Fenhe River Reservoir.Theecological effects of water and soil conservation are analysed and predicted by three prediction models constructed with different time series.The fundamental measure for reducingsilt deposition in the reservoir is proposed as speeding up integrated control of water andsoil conservation at the upper reaches of the reservoir.

Ecolomie system analysis of fishery rcsourecs exploitation

Ye Yimin

1990, (1):  32-37. 

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The dynamic process of fishery ecolomic system was described with mathematical models.The interaction between economic and ecological subsystems and their changes of cycle flow with the development of fishery and the change of the ratio of fishing cost to fish pricewere analysed in detail.Finally,effective management measures designated to achieve arational structure in fishery ecolomic system were suggested.

Fully using coastal sand vegetation resources in Fujian for the development of farming

Zhang Dapeng

1990, (1):  38-41,46. 

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Based on a survey of the community type and distribution of vegetation resources in Fujiancoastal areas,a basic model is proposed to transform the current simple-structured shelterforest into a shelter forest system with herb,shrub,tree communities and various cerealcrops.The mutualistie relations among the components of forest are preliminarily discussed.Practicable measures include developing agriculture in the shelter forests,transforming threekinds of herb communities into sand-holding grazing land and growing medical crops inthe coastal sand areas.

Preliminary study on man and environment in Wuling mountainous area

Teng Yu

1990, (1):  42-46. 

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Based on the large amount of facts in population growth,forest resource destruction,frequentdisater of drought and flooding and intensified water and soil erosion in Wuling Mountainous area,this paper shows the important role of human activity in the ecological equilibrium.It eoncludes that human factor is the key in the environmental protection.

Improvement of upland agro-ecosystem:case study in Ganjing township of Heyang county

Liang Hongru, Liang Lianyou

1990, (1):  47-50. 

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Ganjiang township in Heyang county of Shanxi province is a typical upland farming area.As a result of long-term extensive cultivation,over-reclaimation and serious soil and watererosion,the eco-environment has been greatly destroyed.With a series of effective measuresto restore the disordered agroecosystem,grain production and other incomes are progressively increased,and the economic,social and eeological effieieneies are greatly improved.Agrieultural productions are progressing with fine eyclings.

Influence of eco-environment on symbiotic system of Rhizobium-Robinia pseudoacacia

Shu Fengyan, Sun Huijun, Li Weiguang, Ding Jian, Lei Qidi

1990, (1):  51-53,61. 

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Experimental results show that:with a trace content of 10ppm N,the plant biomass isincreased by 30%,and nitrogenase activity by 30—100%.There is no nodule formed with50ppm N application.With 500ppm P and K and 10ppm trace element fertilizers,noduleformation can be promoted and plant biomass increased.The optimum range of pH for thegrowth of symbiotic system is from 6 to 7.When it is close to 8,plant biomass and nitro-genase activity are reduced.Illumination intensity and seasonal variation also affect theactivity of nitrogenase,which is high from July to September and is inhibited in October.

Investigation on soil fauna in the natural reserve of Xilinguole grassland

Zhao Xiaoxia, Terata binako

1990, (1):  54-56. 

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Investi gations on soil fauna are made in the natural reserve of Xilinguole grassland.Indifferent habitats of the grassland ecosystem,the species and quantity of soil fauna arenot only varied with the type and properties of soil,but also influenced comprehensivelyby other ecological factors.Therefore,the species and quantitative distribution of soll faunacan reflect the characteristics of different habitats to a certain extent.They are suggestedto be taken as the indicator for the fertility level of different soil types in the grassland ecosystem.

Preljminary study on the method of monitoring coastal oil pollution by mangrove plants

Lu Changyi, Lin Peng

1990, (1):  57-59,66. 

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Based on the monitoring of oil pollution near the ship-disassembling workshop of XiamenSpecial Economic Zone,the method of biomonitoring coastal oil pollution by means of mang-rove plant(Avicennia marina)is studied.The results show that oil contaminant on leafsurface has a monitoring and“recording”function to oil pollution in nearby coasts.Accor-ding to the water sample analysis,oil contaminant on leaf surface increases with increasingoil pollution.Mangrove plant growing on tidal zone has an oil-resistivity.It can be usedfor monitoring coastal oil pollution.

A general formula for determining leaf area of a kind of broad-leaved trces

Ma Liangqing

1990, (1):  60-61. 

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Based on observations and measurements,a leaf morphological equation of a kind of broad-leaved trees is proposed,by integration of which,a general formula is obtained for calcu-lating the loaf area of this kind of broad leaved trees.The formula is simple,convenientand highly accurate.

Promotive effect of needle amount controlling on the trunk growth of evergreen conifers

Xie Jin

1990, (1):  62-66. 

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This paper presents a physiological-ecological research on the crown thinning of conifers.It is concluded that suitable crown thinning can speed up the growth of tree trunks:(1)Crown thinning can improve illumination conditions which is advantageous to photosynthesis;(2)It is important to keep the maximum surface area of crown in the process of thin-ning;(3)Gencrally,a thinning intensity of 20—40% can incrcase the growth rate of trees.