Suitable cultivated land in Tibet and its main distribution and characteristics?

At present, there are 6,805,700 mu of cultivated land, accounting for 0.42% of the total land area in the region. The net cultivated land area is 5.2343 million mu, accounting for 0.3 1% of the total land area in the whole region. There are 969.348 million mu of grassland, accounting for 56.72% of the total land area in the region. There are woodland 1.07 1.6 million mu, accounting for about 6.27% of the total land area in the whole region. Residential and industrial land is 504,500 mu, accounting for about 0.03% of the total land area in the region; The traffic land is 329,200 mu, accounting for about 0.02% of the total land area in the region; The water area is 829 1.96 million mu, accounting for about 4.85% of the total land area of the whole region. The unused land is 543.548 million mu, accounting for 365.438+0.8% of the total land area of the whole region. As can be seen from the above data, grassland and unused area are the largest, accounting for 88.52% of the total land area of the whole region, followed by woodland, water area, cultivated land, residential areas, industrial and mining land and traffic land. The total area of cultivated land, grassland and forest land accounts for 63.3% of the total land area in the whole region. The existing land for grain crops, fruit trees, vegetables, tea and green fodder belongs to cultivated land. The area with the largest cultivated land area accounts for 37.79% of the cultivated land area in the whole region; The second area accounts for 19.86%. The cultivated soil area is basically similar, accounting for 15.65% and 15.48% respectively. Cultivated soil 8.65%; The cultivated land area is relatively small, accounting for 1.99% and 0.58% respectively. Of the 74 counties in the region, 62 have cultivated land, accounting for 84% of the total.

The cultivated land in the whole region belongs to 16 soil type among 28 soil types, and there are 12 soil types without cultivated land. Among them, the cultivated mountain shrub grassland has the largest soil area, accounting for 33.8 1% of the whole cultivated soil area, followed by moist soil and cultivated subalpine grassland soil, accounting for 65,438+02.83% and 65,438+02.38% respectively. Cultivated meadow soil accounts for 9. 1%. 9.47% is subalpine meadow soil. Cultivated cinnamon soil accounts for 8. 1%. Cultivated cinnamon soil accounts for 7.99%. Cultivated brown soil accounts for 2.86%. These eight types of cultivated soil account for 96.95% of the cultivated soil area in the whole region, while the other eight types of cultivated soil are few, accounting for only about 3% in total. The cultivated soil is mainly distributed in the valley south of Gangdise Mountain to Nyainqentanglha Mountain and the alluvial fans, alluvial terraces, alluvial terraces and lake basin terraces in Sanjiang Valley. Among them, the cultivated soil of the main platform of Yarlung Zangbo River and the tributaries of Lhasa River and Nianchu River accounts for 55% of the cultivated soil in the whole region, and the landform conditions are relatively consistent.

The vertical distribution range of cultivated soil is 6 10m ~ 4795m above sea level, of which the area below 2500m accounts for 5.6%, the area between 2500m and 3500m accounts for1.4%, and the area between 3500m and 4100m accounts for 60%.