Zhang Zhen, Jin Guo Qing, Zhou Zhi Chun, Feng Zhong Ping, Sun Lin Shan
Research Institute of Subtropical Forestry, Chinese Academy of Forestry, State Forestry Administration Engineering Research Center of Masson Pine, Zhejiang Provincial Key Laboratory of Tree Breeding, Hangzhou 311400, China.
Laoshan Forest Farm, Chun'an 311700, Zhejiang, China.
Ying Yong Sheng Tai Xue Bao. 2019 Jun;30(6):1815-1822. doi: 10.13287/j.1001-9332.201906.007.
We used 10 representative provenances at different latitudes in two 33-year-old Pinus massoniana provenance test stands (Chun'an Laoshan in Zhejiang and Taizi Mountain Shilong in Hubei) to measure the differences among provenances, study the geographical variation, and identify its responses to hydrothermal factors. The results showed that the δC of the average annual rings was significantly different among the provenances of P. massoniana, being higher in trees from high latitude than from low latitude. The δC of average annual rings showed a zonal variation trend, indicating an adaptation to the original environment. The δC of annual rings was negatively correlated with mean annual temperature (MAT), mean temperature in January (T), annual precipitation (MAP), precipitation from May to September (P) and cumulative temperature above 10 ℃ (CT). It was positively correlated with the aridity index (AI). The response function of AI toδδC annual rings in Chun'an and Taizi Mountain explained 37.5% and 42.5% of the variation, respectively, indicating that AI was the most important limiting factor. The Taizi Mountain test site in Hubei Province located in the central and western region with relatively dry soil and high aridity. Therefore, the δC of the average annual ring was 1.8% higher than that in the Chun'an test site. The δC rings of P. massoniana at the Taizi Mountain and Chun'an were sensitive to the temperature in July and August, respectively. Summer precipitation was the main factor for carbon isotope fractionation with stable rings. The sensitivity of different provenances to future climate changes was different.
我们在两个33年生的马尾松种源试验林分（浙江淳安姥山和湖北太子山石龙）中，选取了10个位于不同纬度的代表性种源，以测定种源间的差异，研究地理变异，并确定其对水热因子的响应。结果表明，马尾松种源间平均年轮的δC存在显著差异，高纬度树木的δC高于低纬度树木。平均年轮的δC呈地带性变异趋势，表明对原生环境的适应性。年轮的δC与年平均温度（MAT）、1月平均温度（T）、年降水量（MAP）、5-9月降水量（P）以及10℃以上积温（CT）呈负相关。与干燥度指数（AI）呈正相关。淳安和太子山AI对年轮δC的响应函数分别解释了37.5%和42.5%的变异，表明AI是最重要的限制因子。湖北省太子山试验点位于中西部地区，土壤相对干燥，干燥度高。因此，平均年轮的δC比淳安试验点高1.8%。太子山和淳安马尾松的δC年轮分别对7月和8月的温度敏感。夏季降水是稳定年轮碳同位素分馏的主要因素。不同种源对未来气候变化的敏感性不同。
