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Demand for rubber is causing the loss of high diversity rain forest in SW China

机译:橡胶需求正在造成西南中国高多样性雨林的丧失

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As the economies of developing countries grow, and the purchasing power of their inhabitants increases, the pressure on the environment and natural resources will continue to increase. In the specific case of China, impressive economic growth during the last decades exemplifies this process. Specifically, we focus on how changing economic dynamics are influencing land-use and land-cover change in Xishuangbanna, China. Xishuangbanna has the richest flora and fauna of China, but increasing demand for natural rubber and the expansion of rubber plantations is threatening this high-diversity region. We quantified land-use/land-cover change across Xishuangbanna using Landsat images from 1976, 1988, and 2003. The most obvious change was the decrease in forest cover and an increase in rubber plantations. In 1976, forests covered approximately 70% of Xishuangbanna, but by 2003 they covered less than 50%. Tropical seasonal rain forest was the forest type most affect by the expansion of rubber plantations, and a total of 139,576 ha was lost. The increase of rubber plantations below 800 m, shifted agricultural activities to higher elevations, which resulted in deforestation of mountain rain forest and subtropical evergreen broadleaf forest. Although these changes have affected the biodiversity and ecosystem services, we believe that long-term planning and monitoring can achieve a balance between economic and social needs of a growing population and the conservation of a highly diverse flora and fauna. Below 800 m , we recommend that no more rubber plantations be established, existing forest fragments should be protected, and riparian forests should be restored to connect fragments. Future rubber plantations should be established in the abandoned arable or shrublands at higher elevations, and tea or other crops should be planted in the understory to improve economic returns and reduce erosion.
机译:随着发展中国家经济的增长,居民购买力的增加,对环境和自然资源的压力将继续增加。以中国为例,过去几十年的惊人经济增长就是这一过程的例证。具体而言,我们关注于变化的经济动态如何影响中国西双版纳州的土地利用和土地覆盖变化。西双版纳州拥有中国最丰富的动植物群,但是对天然橡胶的需求不断增长,橡胶种植园的扩张正威胁着这个高多样性地区。我们使用1976年,1988年和2003年的Landsat影像对西双版纳的土地利用/土地覆盖变化进行了量化。最明显的变化是森林覆盖率的下降和橡胶园的增加。 1976年,森林覆盖了西双版纳的约70%,但到2003年,森林覆盖率还不到50%。热带季节性雨林是受橡胶林扩张影响最大的森林类型,共损失了139,576公顷。 800 m以下的橡胶园增加,农业活动转移到更高的海拔,导致山地雨林和亚热带常绿阔叶林的砍伐。尽管这些变化已影响到生物多样性和生态系统服务,但我们认为,长期规划和监测可以在不断增长的人口的经济和社会需求与高度多样化的动植物保护之间取得平衡。在800 m以下,我们建议不要再建立橡胶园,应保护现有的森林碎片,并应恢复沿岸森林以连接碎片。未来的橡胶种植园应在海拔较高的废弃耕地或灌木丛中建立,茶树或其他农作物应种植在林下,以提高经济效益并减少侵蚀。

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