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南亚热带鼎湖山自然保护区的非核心地带的旅游活动和附近工厂区污染气体的排放，影响了马尾松年轮中的δ１３Ｃ值和空气ＣＯ２的δａ值。旅游点年轮的δ１３Ｃ值自１９６５～１９９２年以年均－０．０２６‰速率下降，１９８０～１９９２年年均下降速率增至－０．０４４‰。工厂点的马尾松年轮δ１３Ｃ则随时间而递增，气体污染改变了δ１３Ｃ值的年际变化图式。１９８０～１９９２年，对照点、旅游点和工厂点空气ＣＯ２浓度年均增高速率分别为０．６８，０．９８和２．３０μＬ／Ｌ。１９９４年空气ＣＯ２的δａ值在旅游点和工厂点比对照点低－０．１８‰和－０．４４‰。
The tourism activities in the non-core zone of the southern subtropical Dinghushan Nature Reserve and the discharge of polluting gases from the nearby factory area affected the δ13C value and δa value of air CO2 in Pinus massoniana rings. The δ13C value of the annual rings of tourist spots decreased from -0.026 ‰ at an average annual rate from 1965 to 1992, and from 1980 to 1992, the average annual decline rate increased to -0.044 ‰. The δ13C of Masson pine growing at the factory increased with time, and the gas pollution changed the interannual variation of δ13C values. From 1980 to 1992, the average annual increase rates of air CO2 concentration in control points, tourist spots and factories were 0.68, 0.98 and 2.30 μL / L, respectively. In 1994, the δa value of air CO2 was -0.18 ‰ and -0.44 ‰ lower at tourist spots and factories than the control point.