| 水平沟生态恢复措施下宁夏典型草原土壤种子库特征 |
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| 引用本文： | 张蕊,马红彬,贾希洋,周瑶,宿婷婷,李维军,蔡育蓉.水平沟生态恢复措施下宁夏典型草原土壤种子库特征[J].草业科学,2018,35(5):984-995. |
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| 作者姓名： | 张蕊 马红彬 贾希洋 周瑶 宿婷婷 李维军 蔡育蓉 |
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| 作者单位： | 宁夏大学农学院,宁夏 银川,750021;宁夏大学农学院,宁夏 银川750021;宁夏大学西北土地退化与生态恢复省部共建国家重点实验室培育基地,宁夏 银川750021;宁夏云雾山草原自然保护区管理处,宁夏 固原,756000 |
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| 基金项目： | 国家自然科学基金项目(31460632、31360582),中国科学院"西部之光"人才培养引进计划项目(XAB2015A10),宁夏高等学校一流学科建设(草学学科)资助项目(NXYLXK2017A01) |
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| 摘 要： | 开展土壤种子库的研究对草原生态恢复具有重要意义。以宁夏黄土丘陵区典型草原放牧草地(对照F0)、15年封育(F15),水平沟整地1年后(S1)、3年后(S3)、6年后(S6)、10年后(S10)和15年后(S15)的草地为研究对象,分别对其0-5、5-10和10-15cm土壤种子库的物种组成、大小、物种多样性及其与地上植被的相似性进行了研究,对种子库特征与土壤因子进行典范对应分析(CCA)。结果表明,1)植物种类以S1最多,F15次之,F0和S10较少;随着水平沟恢复年限增加,种子库植物种类无明显变化规律,但种子库主要植物由一年生草本向多年生草本转变。2)土壤种子库密度以F15、S3和S15较高,F0最低;土壤种子库密度具有表聚特征;随着水平沟恢复年限的增加,种子库总密度呈现出上升-下降-上升变化。3)土壤种子库丰富度、优势度、多样性和均匀度指数在处理间无明显变化规律;种子库与地上植被的相似性系数为0.38~0.55,相似性总体较低,相对而言,F15年相似性最高、S3次之,S10与S15最低。4)CCA表明,土壤速效钾、全磷和土壤含水率是影响该区土壤种子库分布的主要因子。研究认为,与放牧草地相比,水平沟整地措施能使典型草原土壤种子库物种种类和密度出现一定程度的增加,但作用仍低于草地长期封育。
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| 关 键 词： | 恢复措施 恢复年限 密度 物种多样性 相似性系数 典范对应分析 黄土丘陵区 |
Characteristics of soil seed banks of a typical grassland in the loess hilly region of Ningxia ecologically restored by contour trenching |
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| Zhang Rui,Ma Hong-bin,Jia Xi-yang,Zhou Yao,Su Ting-ting,Li Wei-jun,Cai Yu-rong.Characteristics of soil seed banks of a typical grassland in the loess hilly region of Ningxia ecologically restored by contour trenching[J].Pratacultural Science,2018,35(5):984-995. |
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| Authors: | Zhang Rui Ma Hong-bin Jia Xi-yang Zhou Yao Su Ting-ting Li Wei-jun Cai Yu-rong |
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| Abstract: | The study of soil seed banks is of great significance in the ecological restoration of grasslands.We in-vestigated the density characteristics,species diversity,and similarity to the aboveground vegetation of the soil seed bank,and the characteristics of seed and soil factors using a canonical correspondence analysis(CCA) model for the 0—5,5—10,and 10—15 cm soil layers under different restoration measures in a typical steppe grassland in Ningxia.We selected sites that had been subject to enclosure for 15 years(F15),contour trenching for 1 year(S1),contour trenching for 3 years(S3),contour trenching for 6 years(S6),contour trenching for 10 years(S10),or contour trenching for 15 years(S15);grazed grassland(F0)was used as a control.The re-sults showed that 1)The number of plant species was the highest in S1,followed by that in F15,and the lowest in F0and S10.There were no significant differences in seed bank plant species with increasing years,but the seed bank constituents shifted from annuals to perennials.2)The density of the soil seed bank was the highest in F15,intermediate in S3and S15,and the lowest in F0.The density of the soil seed banks was characterized u-sing table clustering.With the increase in the duration of contour trenching,the total seed bank showed an up—down—up trend.3)The similarity coefficient between the seed bank and aboveground vegetation in the va-rious treatments was generally low,at 0.38~0.55.F15had the highest similarity with S3,and the lowest with S10and S15.4)CCA showed that soil available potassium,moisture content soil total phosphorus,and were the main factors affecting the distribution of soil seed banks in this area.Our study showed that,compared with grazed grassland,restoration through contour trenching can increase the number of species and density of soil seed banks in a typical grassland,but the effect is still lower than that of enclosing the grassland. |
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