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Study of Forest Pattern and Vegetation Succession of Eastern Shore of Hovsgol Lake

Damdinjav Zoyo

As a part of the forest structure, shrubbery and grass plants play a considerable role in forest life and development and enable to flow absorbing distinct part of rain and precipitation, distributing evenly and gradually and enrich the soil with organic substances. The first stage of the forest restoration takes place in the grass plant environment. Seedlings and young trees life, development and dynamics are connected closely to grass plant. The existence of forests depends on their many composition elements and dynamics, therefore their complex investigation is of scientific practical and informative importance. The only investigation of the shrubbery and grass plant changes in Eastern shore of Khovsgol lake is not sufficient, so it is essential to clear these changes and positive and negative influences on the forest restore. We investigated the reasons for changes of the shrubbery and grass vegetation through the Eastern shore of Khovsgol lake’s six riverbeds (Turag, Shagnuul, Noyon, Dalbaa, Sevsuul, Borsog) in the investigation transect squares of the project.

Within the identification of characteristics of the changes on a shrubbery and grass vegetation through the fell timber in the fir, larch forest and forest restore in Turag, Shagnuul, Noyon, Sevsuul, Dalbaa and Borsog of the Eastern shore of Khovsgol Lake. Pseudo-taiga fir forest origin from Larix sibirica, Pinus sibirica.

In Turag, Noyon, Shagnuul, and Sevsuul’s forest predominated herbs vegetation and in the mountain of the Borsog dominated Poa-Vaccinium, in the Dalbaa Vaccinium-poa communities.

Shrubbery and grass vegetation coverage is so important composition elements in the forest. However, their development restricted in the natural forests. After the forest fire, it is positive and negative influences on the forest restore.

We analyzed by sub-taiga zone of eastern shore of Khovsgol Lake’s forest shrubbery and grass plant differentiation of ecological ceonoses groups. Thus, we parted following three groups:

  • Taiga
  • Forest-meadow
  • Forest-steppe’s plants occurred in eastern shore of the Khovsgol lake.

The percent of forest – meadow plants in bunchgrass communities are high, the percent of taiga and forest-steppe vegetation is low. But the taiga plants in Poa-Vaccinium community is high.

The natural rehabilitation of pseudo-taiga larch forest is growing from larch.

Also, we investigated by succession of burnt forest shrubbery and grass vegetation in the Poa-Vaccinium pseudo-taiga natural larch forest, burnt squares.

It is revealed the changes of disapper of shrubbery and grass vegetation coverage of dominant plants such as Ledum palustre, Rhododendron parvifolia, Spiraea alpina, Vaccinium vitis-idaea, Pyrola incarnata and occurance after the burnt.

Ecological ceonoses groups after vary intensive fire the percent of taiga plants is decreasing and increasement of meadow plant percent. Meadow mesophytes such as, Ribes nigrum, Dasiphora fruticosa, Poa pratensis, Lathyrus humilis, Carex rostrata, Ranunculus japonicus, Polygonum viviparum, Stelleria graminea, Hedysarum inandatum reappeared. Similarity coefficient of ceonosis between natural larch forest and average intensive burnt forest is 58.20%, similarity coefficient of species composition is 61.2%, similarity coefficient of ceonosis between natural larch forest and vary intensive burnt forest is 42.88%, similarity coefficient of species composition is 44.2%, which shows that vegetation cover after fire is affected by fire.

The succession of Larch forest of pseudo-taiga belt’s bunchgrass groups after intensive fire will be changed into the Vaccinium-Poa communities and Poa-Vaccinium communities.

We revealed natural rehabilitation 34,000 p/ha in natural forest, 64,000 p/ha in average intensive burnt square, and disappeared in vary intensive burnt squares. Also, we defined pseudo-taiga larch forest rehabilitate by natural forest after the fire. Thus, we have to protected study area from the forest fire.

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