绿竹生态系统植硅体碳积累与分布特征  

Phytolith-occluded organic carbon accumulation and distribution in a Dendrocalamopsis oldhami bamboo stand ecosystem

作　　者：杨杰[1] 项婷婷[1] 姜培坤[1,2] 吴家森[1,2] 柯和佳 

机构地区：[1]浙江农林大学环境与资源学院,浙江临安311300 [2]浙江农林大学浙江省森林生态系统碳循环与固碳减排重点实验室,浙江临安311300 [3]浙江省苍南县林业局,浙江苍南325800

出　　处：《浙江农林大学学报》2016年第2期225-231,共7页Journal of Zhejiang A&F University

基　　金：浙江省自然科学基金资助项目(LY13C160010);国家自然科学基金资助项目(41471197);浙江农林大学科研发展基金资助项目(2014FR052)

摘　　要：植硅体封存的有机碳（phytolith-occluded organic carbon，PhytOC）已被证明在生物地球化学碳硅循环中具有重要的作用。为了解绿竹Dendrocalamopsis oldhami生态系统中植硅体碳的分布与积累特征，于2014年12月在中心产区浙江省苍南县利用标准地调查方法，采集了不同年龄（1～3年生）、不同器官（叶、枝、秆）、凋落物和土壤样品，分析了硅、植硅体、植硅体碳质量分数。结果表明：绿竹地上部分硅、植硅体、植硅体碳质量分数大小表现均表现为凋落物〉叶〉枝〉秆，其中植硅体碳的质量分数分别为4．28，3．16，0．28，0．04g·kg^-1，植硅体碳总积累量为22．64kg·hm^-2，大小顺序为叶（13．22kg·hm^-2）〉凋落物（5．74kg·hm^-2）〉枝（2．71kg·hm^-2）〉秆（0．96kg·hm^-2）；林地土壤硅、植硅体、植硅体碳质量分数均随着土层厚度的增加而呈降低的趋势，0～100cm土壤中植硅体碳储量为1302．60kg·hm^-2。绿竹植株体内植硅体质量分数与硅、植硅体碳质量分数之间的相关性达极显著（P〈0．O1）或显著（P〈0．05）水平，土壤植硅体碳质量分数与总有机碳质量分数之间也具有极显著（P〈0．O1）相关性。Phytolith-occluded organic carbon(Phyt OC) has been shown to have an important role in carbonsilicon biogeochemical cycling. To understand the characteristics of Phyt OC accumulation, different organs(leaf, branch, and culm), litter, and soil samples were collected in different age stands of 1-3 year old Dendrocalamopsis oldhami bamboo ecosystems from Cangnan County, Zhejiang Province in December 2014. Then,silicon, phytoliths, and Phyt OC were analyzed with a correlation analysis. Results of silicon, phytoliths, and Phyt OC mass fraction showed that Phyt OC content(in g·kg-1) of aboveground litter was(4.28)>leaf(3.16)>branch(0.28)>stalk(0.04). The total accumulation of Phyt OC was 22.64 kg·hm-2 with an order(in kg·hm-2)of leaf(13.22)>litter(5.74) >branch(2.71) >stalk(0.96). Also, reserve stocks of Phyt OC were 1 302.60kg·hm-2in the 0-100 cm soil depth. A highly significant correlation(P<0.01, R2=0.96) was found between silicon and phytolith concentration; a significant correlation(P<0.05, R2= 0.62) was revealed for phytolith and Phyt OC concentration in plants; and a highly significant correlation(P<0.01, R2= 0.80) was shown with Phyt OC and total organic carbon in soils. This results shows that the content of Phyt OC depend on silicon and phytolith in plants, and related to total organic carbon in soils.

关 键 词：森林生态学 绿竹 植硅体 植硅体碳 分布特征 

分 类 号：S718.5[农业科学—林学]