黑土滩人工草地土壤种子库研究.docVIP

黑土滩人工草地土壤种子库研究 伊晨刚1，马玉寿2，李世雄2，王彦龙2 （1. 青海大学，青海 西宁 810016；2.青海省畜牧兽医科学院，青海 西宁 810016） 摘 要 ：采用萌发试验方法，研究了黑土滩人工草地土壤种子库的物种组成、密度、时空格局和物种多样性等特征，为黄河源区黑土滩退化草地改建成的人工草地群落演替的动态预测和持续利用提供一定的理论依据。结果表明：（1）土壤种子库中共有种植物组成，一二年生草本植物灌木。（3）土壤种子库中禾本科植物是群落的优势种，经济型中优良牧草占最大比例。（4）土壤种子库中种子数量在垂直分布上呈现出由表层土壤向深层逐层减少的变化规律。（5）人工建植草地Margalef丰富度指数、Shannon-Wiener多样性指数和Pielou均匀性指数均随年龄的增长而呈下降趋势。 关键词：黑土滩；土壤种子库；人工草地；物种多样性 The study on soil seed bank of cultured grassland on Black Soil Beach YI Chen-gang1,MA Yu-shou2,LI Shi-xiong2,WANG Yan-long2 Qinghai University, Qinghai Xining 810016; Qinghai Academy of Animal and Veterinary Sciences, Qinghai Xining 810016) Abstracts: The characteristics of soil seed bank for cultured grassland on Black Soil Beach are studied by germination test methods , such as species composition, density, spatial and temporal patterns and species diversity,to provide a theoretical basis for Dynamic forecast about Community succession and sustainable use of the degraded grassland turned into the cultured grassland on Black Soil Beach in Yellow River source area.The results showed that: (1) There were 36 plant species in the soil seed bank, which belongs to 16 families. (2)Proportion of species and germination in the soil seed show perennial herbaceous plants annual biennial herbage plants shrubs bank. (3) Gramineae are the dominant species in the community of soil seed bank and Fine pasture occupys the largest proportion in economic model (4)For the vertical distribution, the number of seeds in the soil seed bank took on a decreasing trend with soil depth increasing. (5)The trends of Margalef abundance index, Shannon-Wiener diversity index and Pielou evenness index are decreasing with the growth of the age in cultured grassland. Key Words：Black Soil Beach；Soil seed bank；Cultured grassland；Species diversity 由于人类活动和自然因素的相互作用，近年来青藏高原高寒草甸面临着严重的退化问题，以黑土滩为主的高寒草甸退化现象日益加剧，大量的试验研究结果表明，建植人工草地是快速恢复黑土滩植被的有效途径[1,2]。 该项研究是以在黑土滩上建植的不同类型人工草地为研究对象，开展了人工草地土壤种子库特征分析，旨在为高寒草甸黑土滩人工草地群落演替的动态预测和持续利用提供一