Concept of Threatened Species: IUCN Red List

BIODIVERSITY HOTSPOTS

Wildlife and Biodiversity: Basic Concepts

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Animal Behaviour Sign Stimuli

Forest Cover of North East India

The North eastern region of the country comprising eight states namely Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, Sikkim and Tripura are endowed with rich forest resources. The region which constitutes only 7.98 percent of the geographical area of the country, accounts for nearly one fourth of its forest cover. According to data made available by the India State of Forest Report 2015 the total forest cover of the region is 171,964 sq.km, which is 65.59% of its geographical area in comparison to the national forest cover of 21.34%.

Other highlights of the report with respect to the forest cover of N.E. India are as follows.

a. Of the 36 States/Union Territories of India, 15 States/UT’s have above 33% of their geographical area under forest cover. This includes all the eight States of N.E. India

b. Seven States and UT’s in India have more than 75% forest cover. These include five states from N.E.India including Arunachal Pradesh, Meghalaya, Mizoram, Manipur and Nagaland. Tripura too comes close with 74.49% forest cover. Sikkim has 47.31% forest cover while Assam lies at the bottom with 35.22% forest cover.

c. The total forest cover of the country is 701,673 sq.km. N.E.India with forest cover of 171,964 sq.km thus accounts for 24.5% of the forest cover of the country.

d. Very dense, Moderately dense and Open forest in N.E. India constitute 14.81%, 43.85% and 41.31% of the total forest cover of the region.

State wise forest cover of the region as per India State of Forest Report 2015, is shown as follows

States	Geogra-phical Area	2015 Assessment				Percent Of G.A.
		VDF	MDF	OF	Total
Arunachal Pradesh	83,743	20,804	31,301	15,143	67,248	80.30
Assam	78,438	1,441	11,268	14,914	27,623	35.22
Manipur	22,327	727	5,925	10,342	16,994	76.11
Meghalaya	22,429	449	9,584	7,184	17,217	76.76
Mizoram	21,081	138	5,858	12,752	18,748	88.93
Nagaland	16,579	1,296	4,695	6,975	12,966	78.21
Sikkim	7,096	500	2,160	697	3,357	47.31
Tripura	10,486	113	4,609	3,089	7,811	74.49
Grand Total	262,179	25,468	75,400	71,096	171,964	65.59

Note:

VDF (Very dense Forest): All Lands with tree cover (Including mangrove cover) of canopy density of 70% and above

MDF (Moderately Dense forest): All lands with tree cover (Including mangrove cover) of canopy density between 40% and 70%

OF (Open forest): All lands with tree cover (Including mangrove cover) of canopy density between 10% and 40%

Forest Types of North East India

Over the century, Northeastern India has gained worldwide attention for its diverse and extensive forest cover. Forests of this region are unique, both in terms of their structure and species composition.

Climate, physiography and soils of the region have provided favorable conditions for luxuriant growth of natural vegetation. As the physiography varies from low lying swamps and marshes, to high mountain ridges lying above 6000 m, the soils vary from sand, silt and loam to laterite. The climate of the region seems to have the most telling effect on the vegetation type. The region has one of the heaviest rain falls in the world. Although the average annual rainfall of the region is about 250 cm it varies from place to place. The heavy rainfall which comes from May to September, keeps the relative humidity of the area very high throughout the year. Temperature variation is low, remaining normally between 12 ⁰ C and 35 ⁰ C except in the high hills. These favorable climatic conditions, augmented by fertility of the soils provide for the astounding diversity of flora and fauna characteristic of the region.

Champion and Seth (1968) distinguished 51 types of forests in North East India under 13 broad categories as shown below

I. Tropical Wet Evergreen Forests

1.  Assam valley tropical wet evergreen forest

2.  Upper Assam valley tropical evergreen forest

3.  Cachar tropical evergreen forest

4.  Cane brakes

5.  Wet bamboo brakes

6.  Pioneer Euphorbiaceous scrub

II. Tropical Semi-Evergreen Forests

7.  Assam valley semi-evergreen forest

8.  Sub-Himalayan high alluvial semi-evergreen forest

9.  Syzgium parkland

10. Eastern alluvial secondary semi-evergreen forest

11. Sub-Himalayan secondary wet mixed forest

12. Cachar semi-evergreen forest

13. Moist bamboo brakes

14. Secondary moist bamboo brakes

III. Tropical Moist Deciduous Forests

15. Very moist sal forest

16. Moist plains sal forest

17. Moist sal savannah

18. East Himalayan moist mixed deciduous forest

19. Northern secondary moist mixed deciduous forest

20. Secondary Euphorbiaceous scrub

21. Low alluvial savannah woodland

22. Eastern hollock forest

IV. Littoral and swamp Forests

23. Sub-montane hill valley swamp forest

24. Creeper swamp forest

25. Tropical seasonal swamp forest

26. Eastern wet alluvial grassland

27. Riparian fringing forest

V. Tropical Dry Deciduous Forests

28. Khair-sissu forest

VI. Subtropical Broad-leaved Hill Forests

29. Khasi sub-tropical hill forest

30. Assam sub-tropical hill savannah woodland

VII. Subtropical Pine Forests

31. Assam sub-tropical pine forest

32. Assam sub-tropical pine savannah

VIII. Montane Wet Temperate Forests

33. East Himalayan wet temperate forest

34. Naga hills wet temperate forest

IX. Himalayan Moist Temperate Forests

35. East Himalayan moist temperate forest

36. Cypress forest

37. Montane bamboo brakes

38. Alder forest

39. Low level blue pine forest

X. Himalayan Dry Temperate Forests

40. East Himalayan dry temperate coniferous forest

41. Larch forest

42. East Himalayan dry juniper/birch forest

43. East Himalayan dry juniper/birch forest

XI. Sub-Alpine Forests

44. East Himalayan sub-alpine birch/fir forest

45. Sub-alpine blue pine forest

46. Sub-alpine pasture

XII. Moist Alpine Scrub

47. Birch/Rhododendron scrub

48. Deciduous alpine scrub

49. Dwarf Rhododendron scrub

XIII. Dry Alpine Scrub

50. Dry alpine scrub

51. Dwarf juniper scrub