土壤学报2011，Vol.48Issue(6)：1265-1273,9.
重庆南平喀斯特石漠化区不同土地利用方式下的表土孢粉组合特征
FEATURES OF POLLEN ASSEMBLAGES IN TOPSOIL AS AFFECTED BY LAND USE IN THE KARST AREA OF ROCKY DESERTIFICATION IN NANPING TOWN, CHONGQING
摘要
Abstract
Palynological analysis of 33 samples of topsoils and mosses collected from fields under five different types of land use in the karst area of rocky desertification in Nanping Town, Chongqing, shows that (1) the spores and pollens found in the samples could be sorted into SO genera dominated by those of herbage and ferns, which accounted for 38. 84%～86. 56% of the total (except for samples from Secondary Masson Pine forest, Secondary Cryptomeria forest and Peach orchard) , and was followed by those of arbor (mainly Pinus massoniana) accounting for 13. 42%～59. 40% , and by those of shrubs, accounting for only about 0. 00%～ 12. 50% , which is a significant indicator of serious degradation of the local vegetation; (2) Abundance of pollen types did not differ much from field to field under different land uses, and changes in species diversity took place mainly in arbors and shrubs, and little in herbage and ferns; (3) Pollen assemblage varied sharply from field to field under different land uses, which reflects basically the situation of the current vegetation of the area; (4) With increasing land use intensity, pollens of arbors and shrubs were decreasing in content and type, while those of herbs and ferns increasing, and dominated by pollens of farmland weeds. It is, therefore, concluded that the changes in land use are the main factor affecting the secondary vegetation and the pollen assemblages in the karst rocky desertification area.关键词
表土孢粉组合/石漠化/土地利用方式/重庆南平Key words
Topsoil pollen assemblages/ Rocky desertification/ Land use pattern/ Nanping in Chongqing分类
农业科技引用本文复制引用
郝秀东,欧阳绪红,谢世友..重庆南平喀斯特石漠化区不同土地利用方式下的表土孢粉组合特征[J].土壤学报,2011,48(6):1265-1273,9.基金项目
重庆市自然科学基金重点项目(CSTC2009 BA0002)、国家"十一五"科技支撑计划项目(2006BAC01A16)、国家林业公益性行业科研专项(201204212)、国家林业局948项目(2009-4-20)和国土资源部和广西壮族自治区岩溶动力学重点实验室开放课题基金项目(KDL2008-15)联合资助 （CSTC2009 BA0002）
