神农架大九湖湿地表土植硅体记录及其环境意义  

PHYTOLITH RECORDS IN THE SURFACE SOILS OF DAJIUHU WETLAND AND THEIR ENVIRONMENTAL SIGNIFICANCE, SHENNONGJIA MOUNTAINS

作　　者：伦子健 顾延生 刘红叶[1] 秦养民[2,3] 罗涛[1] 张志麒 

机构地区：[1]中国地质大学武汉环境学院,武汉430074 [2]生物地质与环境地质国家重点实验室,武汉430074 [3]湿地演化与生态恢复湖北省重点实验室,武汉430074 [4]神农架大几湖国家湿地公园管理局,神农架442400

出　　处：《第四纪研究》2016年第3期656-665,共10页Quaternary Sciences

基　　金：国家自然科学基金项目（批准号：41572153）和中国地质大学（武汉）生物地质与环境地质国家重点实验室自主课题（批准号：GBL11203）共同资助

摘　　要：本文对大几湖湿地6种植被类型覆盖的47个典型植物样方表土中的植硅体类刑、组合进行r详细分析，发现大九湖湿地表土主要产帽型、短鞍型、抬高鞍型、长鞍型、十字型、哑铃型、齿型、平滑棒型、突起棒型、刺状棒型、方型、长方型、扇型、犬型以及硅质突起型等植砖体类型，来自草本植物与蕨类植物，少数为裸子类和阔叶类。利用下湿度指数（干旱指数Iph与蒸腾指数Fs）研究各样方生境的T湿变化，总体表现为由湿生泥炭沼泽到旱生草甸，其Iph与Fs呈增大趋势。而土壤理化性质如TOC与磁化率也能够从另外的角度反映环境的小同。植硅体所反映的干湿变化与表土TOC含量、磁化率高低对环境的指示相吻合。本次研究结果表明泥炭湿地表土植硅体能够敏感地指示生境丁湿度变化，为重建大九湖古环境、古气候提供了蕈要方法。This study aims at learning the relationship between modern vegetation compositions, phytolith indices and physicochemical indicators, in order to learn the environmental significance of phytolith in the surface soils of Dajiuhu Wetland. Dajiuhu Wetland （31°24＇-31°33＇N, 109°56＇- 110°11＇E; ca. 1760ma. s.1.） is located in the northwest part of Shennongjia forest region, Hubei Province. Original peats, which can provide continuous records of the subtropical alpine wetland climate, are conserved here. Phytolith analysis in the surface soils is the basis of palaeoenvironment reconstruction. 47 sites of Dajiuhu Wetland are classified into 6 vegetation types by the features of plant species composition and habitat soil, including wet peat bogs, wet herbaceous swamp, degraded semi-wet swamp, wet-moderate meadow, moderate-xeric meadow, and xeric meadow. 10951 phytolith fossils from the samples （collected from 0~ 5cm of the sediments） of this sits are extracted, identified and counted under the microscope, mainly of which are from grasses. The 47 sampling sites are classified into 6 zones （Zone I VI） according to phytolith assemblages, which is similar to the classification by the features of plant species composition. Rondels, square saddles, oblong concave saddles, plateaued saddles, crosses, bilobates, trapeze form polylobates, elongates smooth, elongates protuberant, elongates echinate, parallelepipedal bulliform ceils （including square-shaped and rectangular- shaped）, cuneiform bulliform cells （fan-shaped）, unciform hair cell （point-shaped） and siliconpapilla （Cyperaceae） are found in the surface soils, which are from herbaceous plants and ferns. Rare phytoliths are from gymnosperms and woody plants. Two phytolith indices are calculated： （ 1 ） drought index [ Iph （%） = saddle/ （cross＋bilobate＋saddle） ] and （2） water stress index [ fan-shaped index （Fs） = fan-shaped/（ sum of all phytoliths- elongate ）]. Total organic carbon （TOC） and magnetic s

关 键 词：神农架大九湖 植硅体 TOC 磁化率 牛境 

分 类 号：Q913[天文地球—古生物学与地层学] Q948[生物学—古生物学]