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中文
Table of Content
10 December 1990, Volume 9 Issue 06
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Self-Regulation Mechanism of Striped Hamster in West Shandong Plain——Relations between Adrenal Gland Weight, Sexual Gland Weight, Plasma Cortisol Value and Population Density
Yang Youfeng, Lu Haoquan, Zheng Lili
1990, (6): 1-6.
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This study is conducted from March to December,1987,in agricultural area of west Shandong plain,where the feral striped hamster(
Cricetulus barabensis
) is one of the main rodents.Two parameters of adrenal gland and male testis weights are treated statistically,other biochemical parameters are comprehensively analysed in relation to the populationdensity,age and different seasons.Within the striped hamster population in west Shandongplain,there exists a behavior-endocrine self-regulation mechanism.The adrenal glandweight and plasma cortisol value can be used as indices for predicting the population states.
Energy Accumulation, Distribution, Fixation and Transformation in Man-Made Larch Forest Communities
Liu Shirong, Cai Tijiu, Chai Yixin, Ding Baoyong
1990, (6): 7-10,52.
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The energy accumulation,distribution,fixation,and transformation in four Dahurian larch plantation communities are determined by means of caloric measurement.The caloric valuevaries with plant species and organs.The standing amount of energy,energy fixation andits transformation efficiency vary with different community structures.Communities whichform multiple layers and reasonable space structures possess higher values of energy accumulation,fixation and transformation efficiency,with 3.478?10
8
J.m
-2
,3.129?10
7
J.m
-2
.yr.
-1
and 2.243% respectively.
Photo-utilization Efficiency of Grain Crop and Field Energy-flow Analysis in Low-hilly Red Soil Region
L? Jun, Yu Jinyan, Zhang Lianjia
1990, (6): 11-15.
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Low-hilly red soil regions are important grain production areas in Zhejiang province.Theyhave abundant climatic resources and great productive potentials,but compared with highproductive areas in the province,the conversion ratio of input energy and the photo-utilization efficiency of grain crops are significantly lower.These regions are characterized byhigher crganic fertilizers input,which accounts for 70% of the total energy input for grainproduction.Balances between nutrient elements become more important in the grain production areas.
Study on the Hibernation of
Tetranychus cinnabarinus
Wu Qianhong
1990, (6): 16-19.
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T. cinnabarinus
of all developmental stages have been Obsorved in winter in the suburb of Shanghai.The hibernating female mites are found in two colours:purple-brown and lightpurple.The number of light purple individuals increases with the drop of temperature.Thereare more individuals at quiescences stage than those at mobile stages in the coldestperiod.A few of eggs are laid by the 'summer' females at higher temperature.Their overwintering hosts are chiefly weeds and some vegetables.
Fruiting Pattern of
Larix gmelinii
in Relation to Its Short and Long Shoot Behaviour
Shan Jianping, Xu Zhenbang, Tao Dali, Yang Shanxun
1990, (6): 20-23,6.
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Plot investigations indicate that the fruiting percentage of
Larix gmelinii
increases with theincrease of DBH.After a medium forest fire,seed producticn reduces in 1—2 years.By flower bud investigation in August,Seed production is predicted for the proceeding year,which is verified to be reliable and feasible.From the consideration of short shoot consumption in a major seed year,the fruiting periodicity of
Larix gmelinii
is estimated as3—4 years,which is also supported by the data of fruiting interval investigation for individual trees.Unfavorable events such as late frost or drought can delay the major seedyear,but favorable climate can not shorten the time interval between two major seed years.
Biological Measurement and Ecological Observation of Penguin Breeding Populations at the Penla Ardleylsland and Cape Stigant of Antarctica
Ning Xiuren
1990, (6): 24-27.
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A preliminary study has been made on Gentoo,Adelie and Chinstrap penguins at the Penda Ardley Island and the Cape Stigant of Antarctica from November to December,1982.Theexternal morphology of the three species is described,their breeding habits and populationsizes are also observed,Small populations of the three species with more than 1300 nests,which belong to 20 rookeries are found in a narrow area of northern sea side of the island.A big breeding population of Chinstrap including about 12000 nests is found on thetop of a hill near shore at the Cape Stigant.
Effects of Long-Term Exposure of Low Concentration SO
2
on the Growth and Yield of Soybean
Shu Jianmin, Cao Hongfa, Liu Yanyun, Gao Yingxin
1990, (6): 28-30,58.
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This paper reports the effects of long-term exposure of low concentration SO
2
on the growthand yield of soybean （
Glycine max
）.The potted plants are exposed in the chamber 7 hoursper day for 40 days.SO
2
concentrations are 0,100,150,200 and 25O ppb.The results showthat SO
2
reduces the content of pigments,leaf area and the dry weights of leaf,shoot androot.The effects of SO
2
on the growth and yield of soybean are intensifing with increasing exposure doses.The dry weight and yield of soybean are also reduced obviously by SO
2
even under the concentration with no visible injury to leaves.
Aerodynamic Effects of the Mongolian Scotch Pine Sand-Holding Forest
Xing Zhaokai, Liu Yaping
1990, (6): 31-35.
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Wind speed is measuied in and above sand-holding forest and above fixed dune at Zhanggutai in 1987 and 1988.The measuied wind speed profiles are employed to evaluate theaerodynamic characteristics and their relations with wind speed for sand-holdirf forest.Thezero plane displacement D,roughness length Z
0
and plant drag coefficient C
d
are estimatedas 7.71m,0.93m and 0.13m respectively for the sand-holding forest with an average height of 9.2m at moderate windiness.These characteristic values increase with increasing windspeed.Above canopy,turbulent parameter Ka increases and aero dynamic resistance ra decreases compared with those above fixed dune.
Paying Great Attention to Catastrophic Ecology Research
Yu Mochang
1990, (6): 36-39.
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Taking account of various ecological catastrophs in natural history,this paper shows the great importance of catastrophic ecology research and suggests some directions for it.
Mechanism of Stability of Agroecosystem
Hou Xiangyang
1990, (6): 40-42.
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This paper systematically analyses the mechanisms of homeostasis and exogenous controlling of agroecosystem.The former includes integrity,diversity,substitution and niche homegeneity,and the latter refers to the equal-controlling mechanism.It is very importanto study these mechanisms for theoretical guidance of agroecological practices.
Allelopathy Among Pjants
Song Jun
1990, (6): 43-47.
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This paper reviews the conception of allelopathy and its relations with competition and interference,and discusses about its research methods,universal existance and offects oncommunities.At the meanwhile,large sections are focused on the chemical types,releasestyles and action modes of allelochemical substances.
Soil Chemical Analysis on the Process of Soil Acidification
Pan Genxing
1990, (6): 48-52.
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Some important items and controlling factors involved in the process of soil acidification are discussed in this paper.Soil acidification,as reflected by alkali neutralizing capacityand pH,may be affected by atmospheric acid deposition,which is companied by the accelerated leaching loss of base cations,lowering of pH and mobilization of aluminum to formhydroxyl aluminum suflate minerals.Two parameters △M/△H and △pH/△H may be used asvalid indices for evaluating the soil responses to atmospheric acid deposition.
A Mathematical Note for the Law of Tolerance
Yang Fengxiang, Wang Shunqing
1990, (6): 53-55.
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The Law of Tolerance about the integrative actions of environmental factors is described in this paper.Mathematical methods are used to explain and picture it;and mathematical notesare also given to the Principle of Limiting Factors and the Law of the Minimum.
Mycorrhizal Fungi and Their Distribution in Shandong Province
Zhao Youchun, Ma Qiming
1990, (6): 56-58.
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This paper records 16 genus and 51 species of mycorrhizal fungi in Shandong province and describes their habitats,time for fruit body appearence and distributions.Among them,
Armillaria mellea
is endomycorrhizal,and the others are ectomycorrhizal.
Suillus flaves,S. granulatus,Lactarius deliciosus
and
L. piperatus
are the ecological dominant species.
Research Methods of Primate Ecology
Jiang Haisheng
1990, (6): 59-63.
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For primate ecology research,the census method is put on emphases,because it is basic to he population dynamics study.Several census methods including Linear Density and Nonlinear Density methods are introduced. Food-enhanced primate group and marked-spottedanimal methods are superior for primate's social structure and behaviour ressarch.The problems how to estimate the season and rate of birth and now to calculate the dynamic lifetable for macaque are discussed,an example dealing with these problems is also presented in the paper.
A Statistical Discussion on Taylor's Power Law
Shen Zuorui
1990, (6): 64-67.
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This paper discusses Taylor's Power Law of insect population pattern,and according to its criterion system (factors),discusses the variation of insect population patterns,data treatment and sampling techniques,and compares the law with Iwao's formular.
