Table of Content

10 October 1992, Volume 11 Issue 05

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Biogeochemical Cycling Characteristics of Dahurian Larch Plantation Ecosystem

Liu Shirong

1992, (5):  1-6,15. 

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Based on small catchment experiment, the accumulation, distribution and biological and geochemical cycling of mineral elements in Dahurian larch plantation ecosystem are analyzed. The annual uptake of elements is 203.842kg穐a^-1, annual return is 60% of the annual uptake (124.334kg穐a^-1), and average cyclic coefficient of macroelements including N, P, K, Ca, Mg is 0.607. The nutrient budget indicates that the total input of nine elements from precipitation is 31,928kg穐a^-1穣r^-1, and output in runoff is 19.832kg穐a^-1穣r^-1, and the net accumulation in larch forest ecosystem is 12.104kg穐a^-1穣r^-1, equivalent to 37.9% of the total input. Compared with the geochemical cycling of mineral elements, the biological cycling is characterized by stronger intensity and higher speed.

Climatic Conditions and Dynamic Characteristics of Dry Matter Accumulation in Sorghum

Wang Guoqin, Meng Xiangzhao, Guo Fashen

1992, (5):  7-11. 

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Based on field studies, the relationships between climatic conditions and annual yields of sorghum in Jilin province are analyzed. Different types of bumper, medium and short harvest years are classified using fuzzy subordination, and dynamic models of dry matter accumulation in different harvest years are established, which contributes to the scientific prediction of sorghum yield in years with different climatic conditions.

Ecological Effect and Economic Benefit of Artificial Spartina alterniflora Vegetation—a Preliminary Study

Wang Weizhong, Jiang Fuxing, Zhao Ming

1992, (5):  12-15. 

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The sclar radiation absorption, aboveground biomass and caloric and nutrient contents of artificial Spartina alterniflora vegetation are studied and compared with these of natural Aeluropus-Imperata community. In August, the solar radiation absorption of Spartina vegetation is 90.5%, while that of Aeluropus-Imperata community is 71.8%; the biomass and caloric contents of Spartina vegetation are respectively 1075.03g穖^-2 and 2?10⁷J穖^-2, while these of Aeluropus-Imperata community are 121.92g穖^-2 and 2.34?10⁶J穖^-2; the harvestable crude protein and fat contents of Spartina vegetation are 84.28g穖^-2 and 32.14 g穖^-2, while these of Aeluropus-Imperata community are 8.64g穖^-2 and 2.08g穖^-2, respectively. Therefore, Spartina vagetation has greater ecological and economic benefits than Aeluropus-Imperata cemmunity.

Relationship Between Meteorological Factors and Aboveground Biomass in Kobresia humilis Alpine Meadow

Zhong Haimin, Yang Futun, Lu Guoquan, Shi Shunhai

1992, (5):  16-19. 

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Correlations of air temperature and precipitation with half-month increment of aboveground biomass in Kobresia humilis alpine meadow were analyzed during May-October in 1980-1985. The primary factor influencing aboveground biomass is average air temperature, and the secondary one is precipitation. The synchronous appearance of more precipitation and higher air temperature, is most advantageous to the plant growth.

Grey Connectivity Analysis and Topological Prediction of Forest Eco-Environment at Qilian Mountains and Runoff Amount in Heihe River Basin

Che Kejun, He Hongyuan

1992, (5):  20-24,37. 

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GM(1,1) model groups for predicting runoff amount of Heine River basin on northern slope of the Qilian Mountains are built up with grey system theory. The forest eco-environmental factors influencing runoff amount of Heihe River are analyzed, their connectivities are: precipitation≥0℃ accumulated temperature>forest eco-hydrological factors. The runoff amounts of Heihe River in 1989-2005 and their fluctuation trends are predicted, which provides scientific bases for rational development and utilization of water resources in industry and agriculture.

Preying Behavior of Spotted Woodpecker

Luo Weizhen, Song Yujun

1992, (5):  25-27,74. 

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The preying behavior of spotted woodpecker(Dendrocopos major) was observed in a secondary forest during April-May, 1990. It preys on food by gleaning, probing and sallying, and gleaning is the major way for obtaining food in this habitat. Based on the perching status and beak direction of spotted woodpecker during its preying,three types of gleaning and probing are subdivided.

Patchiness and Patch Dynamics:Ⅱ.Description and Analysis

Li Bailian, Wu Yegang, Wu Jianguo

1992, (5):  28-37. 

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The state-of-the-art survey and review of theories and methods for analyzing and describing patch patterns and patch dynamics are provided n this paper.Quantitative ideas of patchiness, spatial indices and statistical, mathematical and system approaches toward patch patterns and patch dynamics are among the basic issues analyzed, especially including our recent studies on applications of integrated fractal analysis, chaos theory, cellular automata and self-erganized criticality. It is demonstrated that modelling patch patterns and patch dynamics will provide us a new possible way to study heterogeneous ecosystem development and evolution across different time and space scales.

Destruction Causes of Korqin Sandyland and Approaches to Its Restoration

Liu Xinmin, Zhao Halin, Xu Bin

1992, (5):  38-41. 

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This paper analyses the causes of the destruction of Korqin sandyland, indicating that adverse natural factors and unreasonable human productive activities play a decisive role in the destruction. For its restoration, the principles of developing beneficial and avoiding detrimental factors under local conditions must be persisted, and unreasonable productive ways must be ameliorated. Three types of empirical models for desert management are recommended.

Damage of Zinc Pollution to Plants and Plant Endurability

Ye Zhihong

1992, (5):  42-45. 

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Damaged symptoms of plants caused by zinc pollution are described and their induced mechanisms are analyzed.The endurability of plants to zinc pollution varies with different species, ecotypes and individuals. Besides its concentration, zinc damage to plants is also related with environmental pH,phosphorus and other elements. Several mechanisms of plant endurability to Zn are summarized.

Ecolomic Issues in Combination of Agriculture and Animal Husbandry in Northern Shaanxi Province

Wang Kanjia

1992, (5):  46-49,74. 

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Acombination of agriculture and animal husbandry is the dominant characteristic of agricultural production in arid and semi-arid regions. This paper discusses how to evaluate it and how to promote the development of agriculture and animal husbandry productions coordinately by exemplifying the existing situations in northern Shaanxi province.

Variations of Geographic Distribution of Crested Ibis in Shaanxi Province

Li Baoguo, Yang Xingzhong, Wang Kaifeng, Zhang Xiaogong

1992, (5):  50-55,58. 

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Crested Ibis (Nipponia nippon) is a first class rare, endangered and protected bird species in China. Historically, this species was distributed in whole Shaanxi province during Ming and Qing dynasties, and in central and southern Shaanxi from Minguo to the early 1960s. But presently, it can only be found in Yang county at the south side of Qinling Mountain. The main factors for its distributive variation are intensified human activities, vegetation and natural environment destruction, climatic changes and cropping system alternations.

CO₂ Environment in Natural Forests of Changbai Mountain——a Preliminary Study

Yang Sihe, Lin Jihui, Wen Shiyun, Yin Zhongfu

1992, (5):  56-58. 

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Using infra-red gas analyzer and tube-type air sampling unit, the SO₂ concentrations at different heights are measured in natural and secondary korean pine-broad leaved mixed forests on Changbai Mountain.CO₂ in forest stands changes diurnally:in canopy, it decreases during day time and increases at night. CO₂ in forest stands are supplied both from forest floor and atmosphere above canopy. Higher concentration of CO₂ near ground surface provides better CO₂ environment for regenerated seedlings than in upper layers.

Effect of Ecological Environment in Tea Plantations on Aromatic Chemicals and Quality of Red Tea

Zhao Hetao

1992, (5):  59-61,65. 

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The research indicates that red tea produced in tea plantations with better ecological environment possesses superior quality in terms of the variety, composition and content of aromatic chemicals. This superior quality is also presented in the color, odour and taste of tea products.

Current Status, Problems and Future Guided Trend of Agricultural Development in Western Henan Province

Shen Alin

1992, (5):  62-65. 

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The current status and characteristics of agricultural development in western Henan province are discussed, and prominent agricultural problems nowadays are systematically analyzed in the paper. The author points out that only by reforming the present disordered agricultural development model and rebuilding new models suitable for natural characteristics of western Henan province can improve the current status of agro-production system to a new level. Anew agricultural development model is put forward which takes agroecological principles as a guidance and improving agricultural environment as an important target in western Henan province.