论文部分内容阅读
西藏是中国五大牧区之一,天然草地面积达8205.19万公顷,约占全区国土面积的68.4%,是西藏生态安全屏障的重要组成部分。但由于西藏处在青藏高原冷高压干冷西北气流控制下,降水少,低温持续时间长,太阳辐射强烈,多大风,导致生态环境脆弱,抗干扰能力低,自我更新能力差,一旦破坏很难恢复。加之受超载过牧、投入不足等因素影响,草原生态环境面临着退化和生产力下降的严峻考验。对此政府积极开展退牧换草,改良品种,人工种草等措施,改善和保护西藏草原生态,笔者以个案分析,反应整个西藏自治区保护草原生态情况。
Tibet is one of the five pastoral areas in China. Its natural grassland covers an area of 82.0519 million hectares, accounting for 68.4% of the total land area of the entire region. Tibet is an important part of the ecological security barrier in Tibet. However, Tibet is under the control of the cold and dry xenon air in the Qinghai-Tibet Plateau. There is less precipitation, long duration of low temperature, strong solar radiation and more gale, resulting in fragile ecological environment, low anti-jamming ability and poor self-renewal ability. Once the damage is difficult to recover . In addition, affected by factors such as overgrazing, underinvestment and other factors, the grassland eco-environment is facing a severe test of degradation and productivity decline. In this regard, the government actively carried out measures such as removing grass and changing pastures, improving varieties and planting grass to improve and protect the grassland ecology in Tibet. Based on individual cases, the author analyzed the ecological conditions of grassland protection in the entire Tibet Autonomous Region.