不同马尾松种源树干植硅体碳封存潜力比较

  目的  植硅体封存有机碳(PhytOC)在减少大气二氧化碳含量、缓解温室效应等方面具有重要意义。本研究旨在研究不同种源马尾松Pinus massoniana树干植硅体碳封存潜力存在的差异，从而筛选出植硅体碳封存潜力较强的马尾松种源。  方法  在浙江淳安姥山林场采集20个马尾松种源树干样品，20个种源分别来自于全国11个省区的20个产地。以各样品总有机碳、植硅体、植硅体封存有机碳质量分数及树干生物量的测定结果来分析不同马尾松种源植硅体碳封存潜力的差异。  结果  20个马尾松种源树干的总有机碳、植硅体、植硅体封存有机碳、植硅体碳质量分数分别变动于467.6~489.6、0.305~0.845、126.8~210.2、0.049~0.128 g·kg?1；马尾松标准株树干生物量和植硅体碳储量的变动范围分别为76.48~295.39 kg·株?1和4.83~31.58 g·株?1；种源聚类分析可以将20个马尾松种源划分为4类，以湖北通山84、广西恭城111、江西吉安63和广西岑溪115植硅体碳封存能力较强的种源为1类；以河南桐柏21、湖南安化72、广东信宜105为代表的7个马尾松种源的植硅体碳封存能力次之；以浙江淳安56、贵州都匀123、福建永定95为代表的8个马尾松种源为第3类；浙江庆元54为植硅体碳封存能力最差的一类。  结论  不同种源马尾松树干的植硅体、植硅体封存有机碳和植硅体碳含量均具有显著性差异(P＜0.05)。广西岑溪115的植硅体碳封存能力最强，因此在马尾松生态系统中，可通过推广广西岑溪115来提高植硅体碳封存量。图3表2参35

A comparative study of the PhytOC sequestration potential in the trunk of Pinus massoniana of different provenances

  Objective  As phytolith-occluded organic carbon (PhytOC) plays a unique role in the reduction of atmospheric CO₂ contents and the mitigation of the greenhouse effect, this study, with a comparison conducted of the PhytOC sequestration potential of masson pines( Pinus massoniana) of different provenances is aimed at the selection of the Masson pine with the highest PhytOC sequestration capacity.  Method  With masson pines of twenty provenances(twenty regions in 11 provinces ) chosen at Laoshan Forest Farm which is located in Chun’an County of Zhejiang Province, an analysis was conducted of the contents of total OC, phytoliths, PhytOC as well as the trunk biomass of masson pines to highlight the differences of sequestration potential of masson pines of different provenances.  Result  (1) The contents of total OC, phytoliths, PhytOC, and phytolith carbon mass fraction in the trunks of masson pines were in the range of 467.6?489.6, 0.305?0.845, 126.8?210.2, and 0.049?0.128 g·kg?1 respectively. (2) The trunk biomass and PhytOC stock in the trunks of masson pines were 76.48?295.39 kg·plant?1 and 4.83?31.58 g·plant?1, respectively. (3) As was shown in the cluster analysis, the chosen masson pines of 20 provenances can be divided into four categories: a. Hubei Tongshan 84, Guangxi Gongcheng 111, Jiangxi Jian 63 and Guangxi Cenxi 115 which demonstrate the strongest PhytOC sequestration capacity; b. 7 provenances including Henan Tongbai 21, Hunan Anhua 72 and Guangdong Xinyi 105 which demonstrate relatively strong PhytOC sequestration capacity; c. 8 provenances including Zhejiang Chun’an 56, Guizhou Duyun 123, Fujian Yongding 95; d. Zhejiang Qingyuan 54 which demonstrate the weakest PhytOC sequestration capacity.  Conclusion  Significant differences were shown in the content of phytoliths, PhytOC, and carbon content of phytolith in the trunks of masson pines of different provenances (P＜0.05). Guangxi Cenxi 115 demonstrated the highest PhytOC sequestration capacity and should be promoted in plantation in the ecosystem of masson pines so as to increase the sequestration amount of PhytOC. Ch, 3 fig. 2 tab. 35 ref.]