水保所知识产出(1956---)知识库

在纸坊沟流域3 个撂荒阳坡各设置30 个种子雨收集器，于2010 年10 月—2013 年4
月收集种子，2011 和2012 年8 月进行植被调查，研究黄土丘陵沟壑区撂荒植被恢复过程中种
子雨动态特征及其与地上植被的关系．结果表明: 撂荒坡面种子雨来自于17 个科的37 个物
种，主要有达乌里胡枝子、草木樨状黄耆、狗尾草、糙隐子草、长芒草、白羊草、猪毛蒿、铁杆蒿
和阿尔泰狗哇花，占种子雨总量的95．8%; 种子雨中仅有3 个外来物种，与地上植被物种组成
的相似性系数为0．77; 2011 年5 月—2012 年4 月和2012 年5 月—2013 年4 月种子雨的平均
密度分别为3737 和6449 粒·m－2，存在显著的“大小年”现象; 收集期间不同位置收集器收集
的物种数为7～15 个，种子雨密度为3853～37923 粒·m－2 ．研究区种子扩散受到限制，种子雨
密度与其他草地相比处于中等水平，种子雨的时空分布受降雨和微地形等因素的影响存在明
显的异质性．

The objective of this study was to analyze the dynamic characteristics of seed rain on
abandoned slopes in the hilly-gullied Loess Plateau region and identify the relationship between seed
rain and standing vegetation． Three abandoned slopes were chosen as sampling sites in Zhifanggou
watershed． Thirty traps were installed at each site to collect seed rain from October 2010 to April
2013． Standing vegetation was surveyed to identify dominant species in August 2011 and 2012，respectively．
Thirty-seven species belonging to seventeen families were identified in the seed rain，and
the dominant species，i．e．，Lespedeza davurica，Astragalus scaberrimus，Setaria viridis，Cleistogenes
squarrosa，Stipa bungeana，Bothriochloa ischcemum，Artemisia scoparia，A． gmelinii，and Heteropappus
altaicus，took up to 95．8% of the total seed rain． Three species in seed rain were not found
in the standing vegetation． The Sorensen similarity index between seed rain and standing vegetation
was 0．77． Seed rain densities were 3737 and 6449 seeds·m－2 in May 2011－April 2012 and May
2012－April 2013，respectively，and alternate bearing existed． During the study period，seed rain
from different positions varied from 3853 to 37923 seeds·m－2 and belonged to 7－15 species． The
results indicated the space limitation of seed dispersal． Seed rain densities were in the middle of thepack compared with similar ecosystems in other studies． High temporal and spatial heterogeneity of
seed rain was observed because of rainfall，micro-topography and so on．