亚热带不同林龄马尾松林地上器官植硅体碳封存潜力  

Potential of Phytolith-Occluded Organic Carbon Sequestration in Masson Pine Stands at Different Ages in Subtropical China

作　　者：孙凯 吴家森[1,2] 盛卫星 姜培坤[2] 张云晴 葛江飞 Sun Kai;Wu Jiasen;Sheng Weixing;Jiang Peikun;Zhang Yunqing;Ge Jiangfei(College of Environmental and Resource Sciences,Zhejiang A&F University,Lin’an 311300;State Key Laboratory of Subtropical Silviculture,Lin’an 311300;Jiande Forestry Bureau,Jiande 311600)

机构地区：[1]浙江农林大学环境与资源学院,临安311300 [2]亚热带森林培育国家重点实验室,临安311300 [3]建德市林业局,建德311600

出　　处：《林业科学》2020年第12期10-18,共9页Scientia Silvae Sinicae

基　　金：国家自然科学基金项目(31270667);省部共建亚热带森林培育国家重点实验室自主研究课题(ZY20180207)。

摘　　要：【目的】揭示我国亚热带不同林龄马尾松林地上器官的植硅体碳封存特征,计量我国马尾松林植硅体碳封存潜力,为马尾松林长期固碳减排研究提供依据。【方法】采集不同林龄马尾松的树枝、树叶、树干样品,用微波消解法提取植物中的植硅体,并测定植硅体碳含量。【结果】马尾松各地上器官的植硅体及植硅体碳含量排序一致,植硅体含量表现为树叶(1.829 g·kg^-1)>树枝(0.771 g·kg^-1)>树干(0.452 g·kg^-1),植硅体碳含量表现为树叶(0.357 g·kg^-1)>树枝(0.172 g·kg^-1)>树干(0.104 g·kg^-1);树龄对马尾松树叶、树枝的植硅体和植硅体碳含量均有显著影响(P<0.05),而对地上器官的植硅体封闭碳含量均无显著影响(P>0.05);不同年龄马尾松树叶的植硅体含量表现为55 a(2.358 g·kg^-1)>63 a(1.923 g·kg^-1)>36 a(1.719 g·kg^-1)>24 a(1.655 g·kg^-1)>15 a(1.489 g·kg^-1);马尾松树叶植硅体含量与土壤pH值和土壤有效硅含量显著负相关(P<0.05);地上各器官植硅体碳储量表现为树干>树枝>树叶,其中树干和树枝的植硅体碳储量分别占地上器官植硅体碳总储量的69.2%和20.7%;不同年龄马尾松林的地上器官总植硅体碳储量表现为55 a(15.97 kg·hm^-2)>63 a(15.54 kg·hm^-2)>36 a(10.63 kg·hm^-2)>15 a(10.46 kg·hm^-2)>24 a(10.13 kg·hm^-2);不同年龄马尾松林地上器官总植硅体碳封存速率表现为15 a(10.94 kgCO2·hm^-2a^-1)>24 a(9.97 kgCO2·hm^-2a^-1)>36 a(7.20 kgCO2·hm^-2a^-1)>55 a(5.10 kgCO2·hm^-2a^-1)>63 a(4.76 kgCO2·hm^-2a^-1)。【结论】马尾松植硅体含量和植硅体碳含量均存在林龄与器官的显著差异。若以我国现有的马尾松林面积1200万hm^2和平均植硅体碳封存速率7.58 kgCO2·hm^-2a^-1计算,每年可封存91000 t CO2。【Objective】This study reveals the phytolith and phytolith occuluded carbon(PhytOC)storage in the aboveground organ of Pinus massoniana plantations at different stand ages in subtropical China,and measures the PhytOC sequestration potential in P.massoniana plantations,and provides a scientific basis for long-term carbon sequestration research in P.massoniana plantations.【Method】We used a chronosequence approach to examine the effect of stand age on the above-ground part of plant PhytOC storage by sampling 15,24,36,55,and 63 a P.massoniana stands.Phytoliths were extracted by microwave digestion method,and the C concentration in phytoliths was determined.【Result】The distribution of phytolith and PhytOC concentrations in above-ground biomass of P.massoniana varied among different organs of the pine trees(P<0.05).Phytolith concentration decreased in the order of leaf(1.829 g·kg^-1)>branch(0.771 g·kg^-1)>trunk(0.452 g·kg^-1).PhytOC concentration decreased in the order of leaf(0.357 g·kg^-1)>branch(0.172 g·kg^-1)>trunk(0.104 g·kg^-1).Both phytolith and PhytOC concentrations in leaves and branches were affected by age(P<0.05),while no differences were observed for C in per unit of phytolith in the above-ground biomass(P>0.05).Phytolith concentration in leaves differed with stand age in the order:55 a(2.358 g·kg^-1)>63 a(1.923 g·kg^-1)>36 a(1.719 g·kg^-1)>24 a(1.655 g·kg^-1)>15 a(1.489 g·kg^-1).Leaf phytolith concentrations were negatively correlated with concentrations of available silicon(R2=0.27,P<0.05)and pH(R2=0.45,P<0.05)in the 0-10 cm soil layer.PhytOC storage in branches and trunks accounted for 20.7%and 69.2%of the total storage,respectively.PhytOC storage in above-ground biomass was affected by age and decreased in the order of 55 a(15.97 kg·hm^-2)>63 a(15.54 kg·hm^-2)>36 a(10.63 kg·hm^-2)>15 a(10.46 kg·hm^-2)>24 a(10.13 kg·hm^-2).The annual PhytOC sequestration rate in the above-ground part of Masson pine stands was affected by age,decreasing in the order as follows:15 a(10.94 kgCO2�

关 键 词：马尾松 地上器官 植硅体碳 植硅体碳封存潜力 

分 类 号：S153[农业科学—土壤学]