三江源地区不同建植期人工草地植被特征及其与土壤特征的关系
Characteristics of artificial grassland plant communities with different establishment duration and their relationships with soil properties in the source region of Three Rivers in China

王长庭 ¹ 曹广民 ¹ 王启兰 ¹ 施建军 ² 杜岩功 ¹ 龙瑞军 ³

文摘	研究了三江源地区不同建植期人工草地群落生物量、物种组成、多样性指数和土壤理化特征,并用多元逐步回归分析法探讨了土壤理化特征对群落生物量、多样性变化的响应.结果表明:研究区不同建植期人工草地植物群落的种类组成、植物功能群组成和群落数量特征存在显著差异;土壤含水量随着物种多样性指数的增加而增加,土壤容重随着物种多样性的增加而减小;土壤微生物生物量碳与土壤含水量、土壤有机质呈极显著正相关,与土壤容重呈极显著负相关;土壤有机碳含量明显呈"V"字型变化,且与土壤含水量的变化趋势相一致,随土壤容重的增加而减少;群落生物量与土壤养分和土壤含水量之间呈显著正相关,群落地上、地下生物量的增加有利于提高土壤养分含量.
其他语种文摘	This paper studied the biomass,species composition,and diversity index of artificial grassland plant communities with different establishment duration in the source region of the Three Rivers,and examined the relationships of soil physical and chemical properties with the changes of the plant community biomass and species diversity.The results showed that the species composition,functional group composition,and quantitative characters of the plant communities varied greatly.Soil moisture content increased with increasing species diversity,while soil bulk density was in adverse.Soil microbial biomass carbon significantly positively correlated with soil moisture and organic matter contents,but negatively correlated with soil bulk density.Soil organic carbon content had a "V" type change,which was consistent with the change pattern of soil moisture content,and decreased with increasing soil bulk density.Plant community biomass had significant positive correlations with the contents of soil nutrients and moisture,and the increase of the above-and below-ground biomass of plant communities promoted the increase of soil nutrient contents.
来源	应用生态学报 ,2007,18(11):2426-2431 【核心库】
关键词	三江源区 ; 植被演替 ; 土壤特征 ; 人工草地
地址	1. 中国科学院西北高原生物研究所, 西宁, 810001 2. 青海省畜牧兽医科学院草原研究所, 西宁, 810016 3. 兰州大学草地农业科技学院, 兰州, 730070
语种	中文
文献类型	研究性论文
ISSN	1001-9332
学科	普通生物学
基金	中国科学院“百人计划”项目 ; 国家自然科学基金 ; 中国科学院野外台站基金项目
文献收藏号	CSCD:3005067