黄土丘陵植被恢复过程中土壤种子库萌发数量特征及动态变化  

Quantitative characteristics and germination dynamic variation of soil seed bank during the course of restoration at Loess gully region

作　　者：郭曼[1,2] 郑粉莉[1,2] 安韶山[1,2] 刘雨[1,2] 白文娟[2] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100

出　　处：《干旱地区农业研究》2009年第2期233-238,共6页Agricultural Research in the Arid Areas

基　　金：国家自然科学基金重点项目(40335050);国家973计划项目(2007CB407201)

摘　　要：采用野外定点采样与室内土壤种子萌发试验相结合的研究方法,选取黄土丘陵区典型草原带宁夏固原地区不同植被恢复年限（2,5,12,24,35,55,75 a）及当年农地（对照）的8个样地,研究该区土壤种子库萌发数量特征及动态变化。结果表明,8个不同植被恢复年限样地土壤中可萌发的种子的平均数量为3542.5粒/m2,可萌发种子以双子叶植物为主,约占萌发总数的90%。0-5 cm土层可萌发种子数量变化于166.7-9100.0粒/m2;5-10 cm土层变化于133.38-2120.02粒/m2。土壤中可萌发种子数量随着恢复年限的增加表现先增加后下降的趋势。土壤中可萌发的种子数量随时间的变化近似单峰型,双子叶植物峰值主要出现在第4-6周,而单子叶植物萌发高峰在5-6周。表明在环境,气候等条件适宜时,黄土丘陵区典型草原带可萌发的土壤中的种子可形成萌发高峰。Taking the pasture zone of Loess gully region（Guyuan Area of Ningxia Hui Municipality） as a case study,this paper selected eight research sites according to the different vegetation restoration years（2,5,12,24,35,55,75 a and cropland control） to study quantitative characteristics and dynamic change of soil seed bank germination through field survey and a laboratory experiment of seed germination.The research results showed at the different vegetation restoration years,average amount of seed sprout was 3 542.5 seeds/m2,and the amount of discotyledon vegetation accounted for 90% of the total.The seed sprout amount in 0～5 cm soil layer varied 166.7 to 9 100.0 seeds/m2 and in 5～10 cm soil layer changed 133.3 to 2 120.0 seeds/m2.At the different restoration years,an order of seed germination amount was increase before and decreases after;the temporal pattern of seed germination amount was approximate unimodal.Except cropland,the peak value of seed germination for dicotyledon appeared in 4 to 6 weeks;the peak value of seed germination for monocotyledon occurred in 5 to 6 weeks.This show that seed in the soil come into being a peak value of germination under the appropriate condition of environment,climate and so on in the pasture zone of Loess gully region.

关 键 词：植被恢复年限 土壤种子库 种子萌发 数量特征 萌发动态 

分 类 号：S154.1[农业科学—土壤学]