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四川省内江地区火炬松中幼林普遍存在针叶黄化、枯焦，生长明显减弱，有的甚至衰亡等现象。针对这一状况，进行了抽样调查和试验研究，采用回归分析方法，分析研究火炬松中幼龄林生长动态变化，并进行评价。结果表明，抽样调查林分，生长到７～８年以后，生长量开始下降，表现生长早衰。与国内其他地区及原产地美国比较，生长动态差异明显。
In the Neijiang area of Sichuan Province, young and middle-aged loblolly pine generally have coniferous and yellowish, burnt coke, the growth is obviously weakened, and some even decline and so on. In response to this situation, a sample survey and pilot study were carried out. The regression analysis method was used to analyze and evaluate the dynamic growth of young and medium-sized Pinus taeda forests. The results showed that, after sampling and surveying the forest stand, after 7 to 8 years of growth, the growth began to decline, showing the premature growth failure. Compared with the rest of the country and the origin of the United States, the growth dynamics were significantly different.