闽江河口区互花米草入侵不同年限下湿地土壤有机碳变化

发布时间：2017-12-27 20:25

本文关键词：闽江河口区互花米草入侵不同年限下湿地土壤有机碳变化　出处：《自然资源学报》2016年04期 　论文类型：期刊论文

【摘要】：为阐明互花米草的固碳潜力,论文在闽江河口区鳝鱼滩湿地选择不同入侵年限的样地,对其0~60 cm土壤理化性质和碳库变化进行测定与分析。结果表明:1)Y_4(4 a)、Y_8(4~8 a)和Y_(12)(8~12 a)3个采样点土壤有机碳含量均值分别为15.5、17.77和19.71 g·kg~(-1),土壤有机碳密度均值分别为10.68、12.29和15.01 kg·m~(-3),总有机碳储量均值分别为65.24、73.99和90.30 t·hm~(-2),其中表层0~20 cm土壤有机碳增加最为显著;2)互花米草入侵引起湿地土壤粘粒和粉粒组成增加,容重和砂粒组成降低,表层土壤C/N增加明显;3)土壤有机碳含量与p H值、盐度、土壤含水量、C/N、平均粒径、粘粒组成呈显著正相关,与容重、砂粒组成呈显著负相关。通过研究发现,短期入侵的互花米草湿地土壤有机碳持续增加,具有较强的有机碳富集能力,在单位面积上可以有效增强河口湿地生态系统的碳蓄积。
[Abstract]:To clarify the carbon sequestration potential of Spartina alterniflora, the choice of different life invasion plots in Minjiang estuary Shanyutan wetland, 0~60 cm on the soil physicochemical properties and carbon pool changes were measured and analyzed. The results show that: 1) Y_4 (4 a), Y_8 (4~8 a) and Y_ (12) (8~12 a) 3 sampling points of soil organic carbon content in average were 15.5, 17.77 and 19.71 g kg~ (-1), the mean soil organic carbon density were 10.68, 12.29 and 15.01 kg (m~ -3), total organic carbon values are 65.24, 73.99 and 90.30 t hm~ (-2), 0~20 cm in the surface soil organic carbon increased most significantly; 2) caused by the invasion of Spartina alterniflora wetland soil clay and silt composition increased, bulk density and sand composition decreased, soil C/N increased significantly; 3) organic carbon the content of soil P and H value, salinity, soil moisture, C/N, average particle size, clay fraction showed a significant positive correlation was negatively correlated with bulk density and sand. It is found that soil organic carbon in Spartina alterniflora wetland is increasing continuously and has strong ability of organic carbon enrichment, which can effectively enhance carbon accumulation in estuarine wetland ecosystem.
【作者单位】：福建师范大学地理科学学院;安庆师范学院资源环境学院;
【基金】：国家基础科学人才培养基金(J1210067) 国家自然科学基金(31000262) 福建省教育厅项目(JA13081) 福建师范大学校创新团队(IRTL1205)~~
【分类号】：S153.6;S45
【正文快照】： 土壤碳库是陆地生态系统中的巨大碳库,其储量约为1 300 Pg C,占全球整个陆地生态系统有机碳库的70%,几乎是大气中碳储量的2倍[1]。因此,其微小变化将会对温室气体的释放乃至整个地球碳循环产生重要影响。湿地面积仅占地球陆地面积的4%~6%,但湿地生态系统却贮藏着全球高达20%~3

【相似文献】