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Table of Content
    Volume 12 Issue 2
    10 February 1988
    Research Articles
    A Preliminary Study on Alpine Vegetation of the Qinghai-xizang (Tibet) Plateau
    Wang Jin-ting
    Chin J Plan Ecolo. 1988, 12 (2):  81-90. 
    Abstract ( 2883 )   PDF (667KB) ( 1060 )   Save
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    The Qinghai-Xizang (Tibet) Plateau is Unique area in natural condition, there alpine vegetation is the richest and the widest distribution, the main types are the alpine scrub, the high-cold meadow, the high-cold steppe, the high-cold desert and sparse vegetation on alpine flowstone slope and the alpine cushion vegetation.These plant communities occupy the alpine belts between the upper line of forest and the permanent snow-line, and they distributively have horizontal regional differentiation from the southeast to the northwest of the Plateau. According to the vegetation characteristics of the vertical belts of mountains and climate condition of the various regions of the Plateau, it may be considered that the vertical vegetation belt spectra of the mountains in the southeast part of the Plateau belong to the humid type of the vertical belt in structure, and those in the center and the northwestern parts of the Plateau belong to the arid type. In addition, the diversify of alpine vegetation: arid. the ecologic-geographic distribution of the alpine cushion vegetation are also. discussed in this paper.
    Vegetation Types on Northern Slopes and the Interior of Central Kunlun Mountains
    Cui Heng-xin, Wang Bo, Qi Gui, Zhang Xiao-chun
    Chin J Plan Ecolo. 1988, 12 (2):  91-103. 
    Abstract ( 2854 )   PDF (802KB) ( 700 )   Save
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    The Central kunlun Mountains, starting from the wulus River in the west to the Andi River in the east, stretching more than 600 km, has an average elevation of 6000 m. Wild seed plants growing in the area are classified into 52 families, 211 genera and 398 species, the flora characterized by purity of floral composition and complicated geographical factors. On its northern slope, the precipitation of the mid-mountain zone and the lower-alpine zone ranges from 300–500 mm and the steppe zone is well developed, especially the steppe zone of the Cele Mountain region (middle section of the Central Kunlun Mountains) is best developed. Above the steppe zone there is no alpine desert, but alpine meadow.The vertical zonal distribution of the vegetation type on the northern slope are as follows. 1. Mountain desert, starting from the piedment line (mostly 2200 m or 2500 m) to 3000 m. 2. Mountain desert steppe 3000—3200 m. 3. Mountain typical steppe, 3200–3600 m. 4. Alpine steppe, 3600–3800 m (sunny slope up to over 4200 m). 5. Alpine meadow, 3800 –4200 m. 6. Alpine cushion vegetation found only in the eastern section and where in combination with the distribution of alpine meadow. 7. Sparse vegetation on alpine flowstone slope, 4200–5000 m.The interior of the Central Kunlun Mountains is extremely clod and dry, and mostly covered by deserts of gravels, where alpine deserts and alpine desert steppes appear in tracts dotting the mountain range.
    Litter-Fall in Tropical Forest at Jianfengling Mountains, Hainan Island
    Lu Jun-pei, Liu Qi-han
    Chin J Plan Ecolo. 1988, 12 (2):  104-112. 
    Abstract ( 2148 )   PDF (491KB) ( 820 )   Save
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    The production dynamic, main chemical components and its storage of litter-fall in two major forest types in the Jianfengling mountains region in Hainan Island were studied in the present article.The mean annul total dry weight of litter-fall in the tropical mountain rain forest (alt. 850m) is up to 7.7t/ha containing branches 21.3%, leaves 70.7%, and flowers and other mixed-matter only 8.0%; while in the semideciduous monsoon forest (alt. 200m) it is 9.7t/ha, containing 17.5%, 76.4% and. 6.1% of these things respectively. The seasonal change patterns of falling in both types are similar, and the maximum quantity of litter-fall occursin March-April (the driest months) and the minimum in December-January. The change of litter-fall depends on that of the month.The order of the chemical components of litter-fall in these two forest types tends to be Ca>Si>K>Mg>Al>P>Fe>Na, the total amount of elements in the semi-deciduous monsoon forest is greater than that in mountain rain forest. About 70-86% of the contents of chemical elements in both types were rich in the leaves.The amount of the chemical elemtnts of the litter-fall returning back to the soil in the semi-deciduous monsoon forest is greater than that of mountain rain forest.
    An Preliminary Study on the Vertical Belts of the Forest Vegetation on the Northern Slope of Motianling Ridge, Gansu
    Shao Ji-xing
    Chin J Plan Ecolo. 1988, 12 (2):  113-122. 
    Abstract ( 1918 )   PDF (619KB) ( 801 )   Save
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    In the paper, the characteristics of the vertical belts of the forest vegetation of the northern slope on the Motianling Mountain were discussed. using the methods of ordination and analysis of the physiognomy of the communities, which are distributed on the slope of the ridge, the following vertical belts of forest vegetation may be discerned.1. Evergreen and deciduous broad-leaf mixed forest belt at alt. 1600 m; 2. Deciduous broad-leaf forest belt at alt.1600–2100 m; 3. Coniferous and broad-leaf mixed forest belt at alt. 2100–2900m; 4. Subalpine coniferous forest belt at alt. 2900–3450m; 5. Alpine bush and meadow belt at alt. 3450m.
    Studies on Primary Productivity in Tianzhu Alpine Polygonum viviparum Meadow I. Biomass Dynamics and Conversion efficiency for Solar Radiation
    Hu Zi-zhi, Sun Ji-xong, Zhang Yin-sheng, Xu Chang-lin, Zhang Zi-he
    Chin J Plan Ecolo. 1988, 12 (2):  123-133. 
    Abstract ( 2124 )   PDF (738KB) ( 1002 )   Save
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    A study was made of the native alpine Polygonum viviparum meadow at the Tianzhu Alpine Grassland Experiment Station of the Gansu Agricultural University, which is approximately 150 km northwest of Lanznou, Gansu Pro vince, China. The results obtained were as follows:

    1. The alpine Polygonum viviparum meadow at Tianzhu starts growth around the 20th of May. Although there is no absolute frost-free period in the region, the growing season is still 120 days. In the period of the present study the biomass change aboveground showed a monopeak curve during the growing season and the maximum value was 548.39g/m2 dry matter(DM)or 489.06g/m2. ash-free matter (AFM) and it occurred on the 2 2nd of August, and then it begin to decline. Net primary productivity was 481.05 g/m2. a DM or 430.25 AFM. The maximum absolute growth rate was 5.89 g/m2·d DM and the relative one 0.152 g/g·d DM, taking place from 20 May—20 June, i. e. during the first month after the start of growth.

    2. Underground biomass of the meadow was quite heavy, the mean value being 6 kg/m2 DM and the change of which, contrary to that aboveground showed a monovalley curve during the growing season. The minimum value of underground biomass was 4556.87 g/m2 DM or 3901.51 AFM, occurring on 20 July and after that, its maxiumu value of was 5996.88 g/m2 DM or 5181.18 AFM, occurring on 20 September, the difference of them (loss of decomposing and grazing etc. were not calculated) was 1440.04 g/m2·a DM or 1235.99 AFM. The absolute growth rate of live roots was 40.27 g/m2·d DM,occurring in second month after the start of growth.

    3. The maximum growth rate aboveground occurred in step with the higher negative growth rate underground during the early growing season.

    4, The conversion efficiency for total solar radiation aboveground was 0.155%, which for physiological radiation was 0.316% and for physiological radiation during 0℃—≤0℃ growing period was 0.692. The maximum conversion efficiency for total radiation could reach to 0.57%, occurring in the first month of the growing period.

    The Dispersion of Korean Pine Seeds and the Effect on Natural Regeneration in the Mixed Korean Pine and Broad-Leaved Tree Forest of the Xiaoxingan Mountains
    Liu Qing-hong
    Chin J Plan Ecolo. 1988, 12 (2):  134-142. 
    Abstract ( 2227 )   PDF (498KB) ( 891 )   Save
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    The research on the Korean pine seed bank was conducted in the Liangshiu Korean pine forest natural reserve. Heilongjiang province, from 1982 to 1985. The total 982 quadrats of one square meter were investigated. The results show that the Korean pine seeds were distributed on the four vertical layers through the activities of wildlife. A lot of Korean pine seeds are buried with form of cluster. In the litter or soil around tall Korean pine. Most of seed clusters consist of 2—7 seeds. These buried seeds are the basis of the Korean pine natural regeneration. But unfortunately the place of seed burying is around the big trees in the dense forest. The number of korean pine seeds buried under the forest gaps is very small. Where seed buried is not favourable for the growth of Korean pine seedlings. This is the main obstacle to the Korean pine natural regeneration.
    Preliminary Discussion of Vegetation Succession and Climate Change Since the Holocene in the Baiyangdian Lake District
    Xu Qing-hai, Chen Shu-yin, Kong Zhao-chen, Du Nai-qiu
    Chin J Plan Ecolo. 1988, 12 (2):  143-151. 
    Abstract ( 2509 )   PDF (584KB) ( 706 )   Save
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    Baiyangdian is a large lake in the North China Plain. Pollen analysis of Bai No.4 Drill and field investigation revealed that Baiyangdian Lake was formed during the Middle Holocene and began to shrink and fall into pieces with the cooling and drying process of the climate since the Late Holocene, but it was reserved and developed by human activities.There are five pollen zones in the profile of the Bai No.4 Drill core. On this basis the Holocene strata of the Baiyangdian Lake district can be divided into four stages by means of 14C dating.

    Stage 1. Old Holocene (ll000—9000a.BP.), The vegetation was needleleaved and deciduous broad-leaved mixed woodland dominated by Pinus and steppes. The climate was temperate and subhumid.

    Stage 2. Early Holocene (9000—7500 a. BP.),Pinus woodland and steppes with a semi-cold and semi-arid climate.

    Stage 3. Middle Holocene (7500—3000 a. BP. ), Pinus-Quercus-Betula woodland to swamp. There were allot of Ceratopteris in the swamp at that time. So we think that the temperature was 2–4℃ higher and the precipitation 200 mm more than that at present.

    Stage 4. Late Holocene (3000 a. BP. to present), Pinus with deciduous broad-leaved woodland scattered among herbs to artificial lake. The climate was cool and semi-arid. The development of Baiyangdian Lake has been dominated by both natural climate change and human activities.

    The Volcano of Mt. St. Helens and its Alpine Vegetation
    Yang Fu-tun, L. C. Bliss
    Chin J Plan Ecolo. 1988, 12 (2):  152-158. 
    Abstract ( 1631 )   PDF (403KB) ( 721 )   Save
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    Mt. St. Helens is an active volcano on the western flank of the Cascade: range in the southwestern Washington State, USA. It is located at lat. 46˚00′—46˚30′N, long 121˚52′—122˚40′W. We had investigated the alpine vegetation at Pine Creek, Butte Camp on Mt. St. Helens for three times, totaling ten days during August and September of 1983.The volcano had erupted sending out much pyroclastic, pumice and lava, which devdstated the vegetation around the crater. They not only mechanically destroyed plants tissue, but also buried entirely or partly of the plants.The radiant heat from the volcanic eruption caused the melting of ice and snow, creating huge mudflows, which destroyed and buried vegetation. The high temperture from direct radiant heat incinerated and scorched all the plants. On the other hand, the higher the elevation is, the stronger the wind and the lower the temperture; also snow was present on the alpine range, and this provided a lee for plants, and consequently some plants survived, and new ones grow out of the ground. The alpine vegetation on Mt. St. Helens bears both the characteristic of alpine plants and the brand of volcanic activities: vegetation is sparse, species composition of plants limited, structure of community simple, production low and vegetation propagation being the main type of vegetative reproduction.The different types of alpine vegetation grow in different habitats: The community of Luekea pectinata grow in places covered by ice and snow; the community of Polygonum newberryi, Eriogonum pyroleafolium in localities covered by mudflow; the community of Phyllodace empetriformis on slopes of steep rocks and the community of grasses and sedges on low hills and plains. These are the four main communities on Mt. St. Helens. The recovery and succession of the alpine vegetation has been discussed. There are two types of succession, the primary and the secodary, with the secondary being the main one.Finally, the paper has analysed the reason why no forest occurs, on Mt. St. Helens. We think that it is a result of the active period of the volcano and that the climate conditions are favouable for forest. Also, we have suggested that some herbaceous plants be sown as soon as possible for they can accelerate the recovery of vegetation, and prevent the runoff of soil and water.
    The Convening of Xiv International Botanical Congress in Berlin (West)
    Zhang Xin-shi, Wang Jin-ting
    Chin J Plan Ecolo. 1988, 12 (2):  159-160. 
    Abstract ( 1464 )   PDF (175KB) ( 871 )   Save
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    The Chemical Analytical Method Conference of Grassland Ecosystem Was Held in Lanzhou
    Huang De-hua
    Chin J Plan Ecolo. 1988, 12 (2):  161-161. 
    Abstract ( 1635 )   PDF (53KB) ( 776 )   Save
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    An Introduction to《Photosynthesis in Relation to Plant Production in Terrestrial Environments》
    Jin Qi-hong
    Chin J Plan Ecolo. 1988, 12 (2):  162-162. 
    Abstract ( 1635 )   PDF (117KB) ( 725 )   Save
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    An Introduction to《Quantitative and Dynamic Plant Ecology》
    Wang Feng-you
    Chin J Plan Ecolo. 1988, 12 (2):  163-164. 
    Abstract ( 1589 )   PDF (113KB) ( 613 )   Save
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