The reserves established across a total land area of 410,000 square meters accounts for 33.69 per cent of the land marking the highest ratio in China, said Zongga, director of the Wild Life Protection and Nature Reserve Department of the regional Forestry Bureau.
The proportion stood at just four per cent in 1990, he said.
About 125 wildlife species and 39 wild plant species under state protection live in these forestry, wildlife, wetland, desert, snow mountain and canyon reserves, said the director.
The Tibetan antelope and black-necked crane populations are also expanding, he said.
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Zongga also said the regional authority has mapped out a package of polices and regulations to standardise the protection of nature reserves, state-run Xinhua news agency reported.
Dinghushan, China's first nature reserve, was established in south China's Guangdong Province in 1956.
The establishment of the first batch of nature reserves in Tibet was approved in 1985.