Study on some structural characteristics of up - stream protection forest of Chay River in Hoang Su Phi district, Ha Giang province
Keywords:
Forest structure, up - stream protection forest, Chay RiverAbstract
Based on the investigation of 30 representative plots across different forest stands in Hoang Su Phi district, Ha Giang province, the study identifiedd some structural characteristics of up - stream protection forest of Chay river. The forest composition over different states includes major plant species such as Tram (Syzygium hancei Merr. & Perry), Khao vang
(Machilus bonii Lecomte), De gai (Castanopsis armata (Roxb.) Spach), Soi phang (Lithocarpus fissus Champ. ex Benth),, etc. While the trees of IIa restoration forest state has the lowest average height of 8.2m, the IIIb forest state has the highest of 17.24m. In addition, at both IIIA2 and IIIA3, the forest canopy cover is the highest at 85%, in constrast, that is the lowest at
44% for the state of IIa. In term of forest cover criteria, IIIA
1 forest state has the highest at 90%, but IV forest state has lowest value of 45%. The average cover of forest floor layer of whole stands is above 50%, while the highest of that for state of IIIA1, and the lowest for state of IIA2 and IIb are 90%
and 50%, respectively.
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